/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020, 2021 Vladimír Vondruš <mosra@centrum.cz>

    Permission is hereby granted, free of charge, to any person obtaining a
    copy of this software and associated documentation files (the "Software"),
    to deal in the Software without restriction, including without limitation
    the rights to use, copy, modify, merge, publish, distribute, sublicense,
    and/or sell copies of the Software, and to permit persons to whom the
    Software is furnished to do so, subject to the following conditions:

    The above copyright notice and this permission notice shall be included
    in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
    DEALINGS IN THE SOFTWARE.
*/

#include <numeric>
#include <sstream>
#include <Corrade/Containers/ArrayViewStl.h>
#include <Corrade/Containers/StridedArrayView.h>
#include <Corrade/PluginManager/Manager.h>
#include <Corrade/Utility/DebugStl.h>
#include <Corrade/Utility/Directory.h>
#include <Corrade/Utility/FormatStl.h>

#include "Magnum/DebugTools/ColorMap.h"
#include "Magnum/DebugTools/CompareImage.h"
#include "Magnum/GL/Context.h"
#include "Magnum/GL/Extensions.h"
#include "Magnum/GL/OpenGLTester.h"
#include "Magnum/GL/Framebuffer.h"
#include "Magnum/GL/Mesh.h"
#include "Magnum/GL/Renderbuffer.h"
#include "Magnum/GL/RenderbufferFormat.h"
#include "Magnum/GL/Texture.h"
#include "Magnum/GL/TextureFormat.h"
#include "Magnum/Image.h"
#include "Magnum/ImageView.h"
#include "Magnum/PixelFormat.h"
#include "Magnum/Math/Color.h"
#include "Magnum/Math/Matrix3.h"
#include "Magnum/Math/Matrix4.h"
#include "Magnum/MeshTools/Combine.h"
#include "Magnum/MeshTools/Compile.h"
#include "Magnum/MeshTools/Duplicate.h"
#include "Magnum/MeshTools/GenerateIndices.h"
#include "Magnum/Primitives/Circle.h"
#include "Magnum/Primitives/Icosphere.h"
#include "Magnum/Primitives/Plane.h"
#include "Magnum/Primitives/UVSphere.h"
#include "Magnum/Shaders/MeshVisualizerGL.h"
#include "Magnum/Trade/AbstractImporter.h"
#include "Magnum/Trade/MeshData.h"

#ifndef MAGNUM_TARGET_GLES2
#include "Magnum/GL/MeshView.h"
#include "Magnum/MeshTools/Concatenate.h"
#include "Magnum/MeshTools/GenerateIndices.h"
#include "Magnum/Primitives/Cone.h"
#include "Magnum/Primitives/Plane.h"
#include "Magnum/Primitives/Square.h"
#include "Magnum/Shaders/Generic.h"
#include "Magnum/Shaders/MeshVisualizer.h"
#endif

#include "configure.h"

namespace Magnum { namespace Shaders { namespace Test { namespace {

struct MeshVisualizerGLTest: GL::OpenGLTester {
    explicit MeshVisualizerGLTest();

    void construct2D();
    #ifndef MAGNUM_TARGET_GLES2
    void constructUniformBuffers2D();
    #endif
    void construct3D();
    #ifndef MAGNUM_TARGET_GLES2
    void constructUniformBuffers3D();
    #endif

    void construct2DInvalid();
    #ifndef MAGNUM_TARGET_GLES2
    void constructUniformBuffers2DInvalid();
    #endif
    void construct3DInvalid();
    #ifndef MAGNUM_TARGET_GLES2
    void constructUniformBuffers3DInvalid();
    #endif

    void constructMove2D();
    #ifndef MAGNUM_TARGET_GLES2
    void constructMoveUniformBuffers2D();
    #endif
    void constructMove3D();
    #ifndef MAGNUM_TARGET_GLES2
    void constructMoveUniformBuffers3D();
    #endif

    #ifndef MAGNUM_TARGET_GLES2
    void setUniformUniformBuffersEnabled2D();
    void setUniformUniformBuffersEnabled3D();
    void bindBufferUniformBuffersNotEnabled2D();
    void bindBufferUniformBuffersNotEnabled3D();
    #endif
    void setWireframeNotEnabled2D();
    void setWireframeNotEnabled3D();
    #ifndef MAGNUM_TARGET_GLES2
    void setColorMapNotEnabled2D();
    void setColorMapNotEnabled3D();
    #endif
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    void setTangentBitangentNormalNotEnabled3D();
    #endif
    #ifndef MAGNUM_TARGET_GLES2
    void setWrongDrawOffset2D();
    void setWrongDrawOffset3D();
    #endif

    void renderSetup();
    void renderTeardown();

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    template<MeshVisualizerGL2D::Flag flag = MeshVisualizerGL2D::Flag{}> void renderDefaultsWireframe2D();
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderDefaultsWireframe3D();
    #endif
    #ifndef MAGNUM_TARGET_GLES2
    template<MeshVisualizerGL2D::Flag flag = MeshVisualizerGL2D::Flag{}> void renderDefaultsObjectId2D();
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderDefaultsObjectId3D();
    template<MeshVisualizerGL2D::Flag flag = MeshVisualizerGL2D::Flag{}> void renderDefaultsVertexId2D();
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderDefaultsVertexId3D();
    template<MeshVisualizerGL2D::Flag flag = MeshVisualizerGL2D::Flag{}> void renderDefaultsPrimitiveId2D();
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderDefaultsPrimitiveId3D();
    #endif
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderDefaultsTangentBitangentNormal();
    #endif
    template<MeshVisualizerGL2D::Flag flag = MeshVisualizerGL2D::Flag{}> void renderWireframe2D();
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderWireframe3D();
    #ifndef MAGNUM_TARGET_GLES2
    template<MeshVisualizerGL2D::Flag flag = MeshVisualizerGL2D::Flag{}> void renderObjectVertexPrimitiveId2D();
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderObjectVertexPrimitiveId3D();
    #endif
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    /* This tests something that's irrelevant to UBOs */
    void renderWireframe3DPerspective();
    template<MeshVisualizerGL3D::Flag flag = MeshVisualizerGL3D::Flag{}> void renderTangentBitangentNormal();
    #endif

    #ifndef MAGNUM_TARGET_GLES2
    void renderMulti2D();
    void renderMulti3D();
    #endif

    private:
        PluginManager::Manager<Trade::AbstractImporter> _manager{"nonexistent"};
        std::string _testDir;

        GL::Renderbuffer _color{NoCreate},
            _depth{NoCreate};
        GL::Framebuffer _framebuffer{NoCreate};
        #ifndef MAGNUM_TARGET_GLES2
        GL::Texture2D _colorMapTexture;
        #endif
};

/*
    Rendering tests done:

    [W] wireframe
    [D] primitive/vertex/object ID
    [T] TBN visualization
    [O] draw offset

    Mesa Intel                      WDTO
               ES2                     x
               ES3
    Mesa AMD                        WDT
    Mesa llvmpipe                   WDT
    SwiftShader ES2                 WDxx
                ES3                 WDx
    ARM Mali (Huawei P10) ES2       W xx
                          ES3       W  O (WDT big diffs, needs investigation)
    WebGL (on Mesa Intel) 1.0       W xx
                          2.0       W x
    NVidia
    Intel Windows
    AMD macOS
    Intel macOS                     WDTO
    iPhone 6 w/ iOS 12.4 ES3        W x
*/

using namespace Math::Literals;

constexpr struct {
    const char* name;
    MeshVisualizerGL2D::Flags flags;
} ConstructData2D[] {
    /* Whatever is added here should probably go also into
       ConstructUniformBuffersData2D */
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    {"wireframe", MeshVisualizerGL2D::Flag::Wireframe},
    #endif
    {"wireframe w/o GS", MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader},
    #ifndef MAGNUM_TARGET_GLES2
    {"object ID", MeshVisualizerGL2D::Flag::InstancedObjectId},
    {"vertex ID", MeshVisualizerGL2D::Flag::VertexId},
    #ifndef MAGNUM_TARGET_WEBGL
    {"primitive ID", MeshVisualizerGL2D::Flag::PrimitiveId},
    #endif
    {"primitive ID from vertex ID", MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId}
    #endif
};

#ifndef MAGNUM_TARGET_GLES2
constexpr struct {
    const char* name;
    MeshVisualizerGL2D::Flags flags;
    UnsignedInt materialCount, drawCount;
} ConstructUniformBuffersData2D[] {
    {"classic fallback", MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 1, 1},
    {"", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 1, 1},
    /* SwiftShader has 256 uniform vectors at most, per-2D-draw is 4,
       per-material 4, two need to be left for drawOffset + viewportSize */
    {"multiple materials, draws", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 8, 55},
    /* The rest is basically a copy of ConstructData2D with UniformBuffers
       added */
    #ifndef MAGNUM_TARGET_WEBGL
    {"wireframe", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe, 1, 1},
    #endif
    {"wireframe w/o GS", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 1, 1},
    {"object ID", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::InstancedObjectId, 1, 1},
    {"vertex ID", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::VertexId, 1, 1},
    #ifndef MAGNUM_TARGET_WEBGL
    {"primitive ID", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::PrimitiveId, 1, 1},
    #endif
    {"primitive ID from vertex ID", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId, 1, 1}
};
#endif

constexpr struct {
    const char* name;
    MeshVisualizerGL3D::Flags flags;
} ConstructData3D[] {
    /* Whatever is added here should probably go also into
       ConstructUniformBuffersData3D */
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    {"wireframe", MeshVisualizerGL3D::Flag::Wireframe},
    #endif
    {"wireframe w/o GS", MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader},
    #ifndef MAGNUM_TARGET_GLES2
    {"object ID", MeshVisualizerGL3D::Flag::InstancedObjectId},
    {"vertex ID", MeshVisualizerGL3D::Flag::VertexId},
    #ifndef MAGNUM_TARGET_WEBGL
    {"primitive ID", MeshVisualizerGL3D::Flag::PrimitiveId},
    #endif
    {"primitive ID from vertex ID", MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId},
    #endif
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    {"tangent direction", MeshVisualizerGL3D::Flag::TangentDirection},
    {"bitangent direction from tangent", MeshVisualizerGL3D::Flag::BitangentFromTangentDirection},
    {"bitangent direction", MeshVisualizerGL3D::Flag::BitangentDirection},
    {"normal direction", MeshVisualizerGL3D::Flag::NormalDirection},
    {"tbn direction", MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection|MeshVisualizerGL3D::Flag::NormalDirection},
    {"tbn direction with bitangent from tangent", MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::NormalDirection},
    {"wireframe + vertex id", MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::VertexId},
    {"wireframe + t/n direction", MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::NormalDirection},
    {"wireframe + object id + t/n direction", MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::InstancedObjectId|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::NormalDirection},
    {"wireframe + vertex id + t/b direction", MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::VertexId|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection}
    #endif
};

#ifndef MAGNUM_TARGET_GLES2
constexpr struct {
    const char* name;
    MeshVisualizerGL3D::Flags flags;
    UnsignedInt materialCount, drawCount;
} ConstructUniformBuffersData3D[] {
    {"classic fallback", MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 1, 1},
    {"", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 1, 1},
    /* SwiftShader has 256 uniform vectors at most, per-3D-draw is 4+4,
       per-material 4, plus 4 for projection */
    {"multiple materials, draws", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 6, 28},
    /* The rest is basically a copy of ConstructData2D with UniformBuffers
       added */
    #ifndef MAGNUM_TARGET_WEBGL
    {"wireframe", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe, 1, 1},
    #endif
    {"wireframe w/o GS", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 1, 1},
    {"object ID", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::InstancedObjectId, 1, 1},
    {"vertex ID", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::VertexId, 1, 1},
    #ifndef MAGNUM_TARGET_WEBGL
    {"primitive ID", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::PrimitiveId, 1, 1},
    #endif
    {"primitive ID from vertex ID", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId, 1, 1},
    #ifndef MAGNUM_TARGET_WEBGL
    {"tangent direction", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::TangentDirection, 1, 1},
    {"bitangent direction from tangent", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection, 1, 1},
    {"bitangent direction", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::BitangentDirection, 1, 1},
    {"normal direction", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::NormalDirection, 1, 1},
    {"tbn direction", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection|MeshVisualizerGL3D::Flag::NormalDirection, 1, 1},
    {"tbn direction with bitangent from tangent", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::NormalDirection, 1, 1},
    {"wireframe + vertex id", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::VertexId, 1, 1},
    {"wireframe + t/n direction", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::NormalDirection, 1, 1},
    {"wireframe + object id + t/n direction", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::InstancedObjectId|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::NormalDirection, 1, 1},
    {"wireframe + vertex id + t/b direction", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::VertexId|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection, 1, 1}
    #endif
};
#endif

constexpr struct {
    const char* name;
    MeshVisualizerGL2D::Flags flags;
    const char* message;
} ConstructInvalidData2D[] {
    {"no feature enabled",
        MeshVisualizerGL2D::Flag::NoGeometryShader, /* not a feature flag */
        #ifndef MAGNUM_TARGET_GLES2
        "2D: at least one visualization feature has to be enabled"
        #else
        "2D: at least Flag::Wireframe has to be enabled"
        #endif
        },
    #ifndef MAGNUM_TARGET_GLES2
    {"both object and primitive id",
        MeshVisualizerGL2D::Flag::InstancedObjectId|MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId,
        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"},
    {"both object and vertex id",
        MeshVisualizerGL2D::Flag::InstancedObjectId|MeshVisualizerGL2D::Flag::VertexId,
        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"}
    #endif
};

#ifndef MAGNUM_TARGET_GLES2
constexpr struct {
    const char* name;
    MeshVisualizerGL2D::Flags flags;
    UnsignedInt materialCount, drawCount;
    const char* message;
} ConstructUniformBuffersInvalidData2D[] {
    {"zero draws", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 1, 0,
        "draw count can't be zero"},
    {"zero materials", MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 0, 1,
        "material count can't be zero"}
};
#endif

constexpr struct {
    const char* name;
    MeshVisualizerGL3D::Flags flags;
    const char* message;
} ConstructInvalidData3D[] {
    {"no feature enabled",
        MeshVisualizerGL3D::Flag::NoGeometryShader, /* not a feature flag */
        #ifndef MAGNUM_TARGET_GLES2
        "3D: at least one visualization feature has to be enabled"
        #else
        "3D: at least Flag::Wireframe has to be enabled"
        #endif
        },
    #ifndef MAGNUM_TARGET_GLES2
    {"both object and primitive id",
        MeshVisualizerGL3D::Flag::InstancedObjectId|MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId,
        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"},
    {"both vertex and primitive id",
        MeshVisualizerGL3D::Flag::VertexId|MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId,
        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"},
    #endif
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    {"geometry shader disabled but needed",
        MeshVisualizerGL3D::Flag::NoGeometryShader|MeshVisualizerGL3D::Flag::NormalDirection,
        "3D: geometry shader has to be enabled when rendering TBN direction"},
    {"conflicting bitangent input",
        MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection,
        "3D: Flag::BitangentDirection and Flag::BitangentFromTangentDirection are mutually exclusive"}
    #endif
};

#ifndef MAGNUM_TARGET_GLES2
constexpr struct {
    const char* name;
    MeshVisualizerGL3D::Flags flags;
    UnsignedInt materialCount, drawCount;
    const char* message;
} ConstructUniformBuffersInvalidData3D[] {
    {"zero draws", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 1, 0,
        "draw count can't be zero"},
    {"zero materials", MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 0, 1,
        "material count can't be zero"},
};
#endif

#ifndef MAGNUM_TARGET_GLES2
constexpr struct {
    const char* name;
    SamplerFilter filter;
    SamplerWrapping wrapping;
} ObjectIdDefaultsData[] {
    {"nearest, clamp", SamplerFilter::Nearest, SamplerWrapping::ClampToEdge},
    {"nearest, repeat", SamplerFilter::Nearest, SamplerWrapping::Repeat},
    {"linear, clamp", SamplerFilter::Linear, SamplerWrapping::ClampToEdge},
    {"linear, repeat", SamplerFilter::Linear, SamplerWrapping::Repeat}
};
#endif

constexpr struct {
    const char* name;
    MeshVisualizerGL2D::Flags flags;
    Float width, smoothness;
    const char* file;
    const char* fileXfail;
} WireframeData2D[] {
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    {"", MeshVisualizerGL2D::Flags{},
        1.0f, 2.0f, "wireframe2D.tga", nullptr},
    {"wide/sharp", MeshVisualizerGL2D::Flags{},
        3.0f, 1.0f, "wireframe-wide2D.tga", nullptr},
    #endif
    {"no geometry shader", MeshVisualizerGL2D::Flag::NoGeometryShader,
        1.0f, 2.0f, "wireframe2D.tga", "wireframe-nogeo2D.tga"},
    {"no geometry shader, wide/sharp", MeshVisualizerGL2D::Flag::NoGeometryShader,
        3.0f, 1.0f, "wireframe-wide2D.tga", "wireframe-nogeo2D.tga"}
};

constexpr struct {
    const char* name;
    MeshVisualizerGL3D::Flags flags;
    Float width, smoothness;
    const char* file;
    const char* fileXfail;
} WireframeData3D[] {
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    {"", MeshVisualizerGL3D::Flags{},
        1.0f, 2.0f, "wireframe3D.tga", nullptr},
    {"wide/sharp", MeshVisualizerGL3D::Flags{},
        3.0f, 1.0f, "wireframe-wide3D.tga", nullptr},
    #endif
    {"no geometry shader",
        MeshVisualizerGL3D::Flag::NoGeometryShader,
        1.0f, 2.0f, "wireframe3D.tga", "wireframe-nogeo3D.tga"},
    {"no geometry shader, wide/sharp",
        MeshVisualizerGL3D::Flag::NoGeometryShader,
        3.0f, 1.0f, "wireframe-wide3D.tga", "wireframe-nogeo3D.tga"}
};

#ifndef MAGNUM_TARGET_GLES2
constexpr struct {
    const char* name;
    MeshVisualizerGL2D::Flags flags2D;
    MeshVisualizerGL3D::Flags flags3D;
    const char* file2D;
    const char* file3D;
} ObjectVertexPrimitiveIdData[] {
    {"object ID",
        MeshVisualizerGL2D::Flag::InstancedObjectId,
        MeshVisualizerGL3D::Flag::InstancedObjectId,
        "objectid2D.tga", "objectid3D.tga"},
    {"vertex ID",
        MeshVisualizerGL2D::Flag::VertexId,
        MeshVisualizerGL3D::Flag::VertexId,
        "vertexid2D.tga", "vertexid3D.tga"},
    #ifndef MAGNUM_TARGET_WEBGL
    {"primitive ID",
        MeshVisualizerGL2D::Flag::PrimitiveId,
        MeshVisualizerGL3D::Flag::PrimitiveId,
        "primitiveid2D.tga", "primitiveid3D.tga"},
    #endif
    {"primitive ID from vertex ID",
        MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId,
        MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId,
        "primitiveid2D.tga", "primitiveid3D.tga"},
    {"wireframe + object ID",
        MeshVisualizerGL2D::Flag::InstancedObjectId|MeshVisualizerGL2D::Flag::Wireframe,
        MeshVisualizerGL3D::Flag::InstancedObjectId|MeshVisualizerGL3D::Flag::Wireframe,
        "wireframe-objectid2D.tga", "wireframe-objectid3D.tga"},
    {"wireframe + object ID, no geometry shader",
        MeshVisualizerGL2D::Flag::InstancedObjectId|MeshVisualizerGL2D::Flag::Wireframe|
        MeshVisualizerGL2D::Flag::NoGeometryShader,
        MeshVisualizerGL3D::Flag::InstancedObjectId|MeshVisualizerGL3D::Flag::Wireframe|
        MeshVisualizerGL3D::Flag::NoGeometryShader,
        "wireframe-nogeo-objectid2D.tga", "wireframe-nogeo-objectid3D.tga"},
    {"wireframe + vertex ID",
        MeshVisualizerGL2D::Flag::VertexId|MeshVisualizerGL2D::Flag::Wireframe,
        MeshVisualizerGL3D::Flag::VertexId|MeshVisualizerGL3D::Flag::Wireframe,
        "wireframe-vertexid2D.tga", "wireframe-vertexid3D.tga"}
};
#endif

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
constexpr struct {
    const char* name;
    MeshVisualizerGL3D::Flags flags;
    MeshVisualizerGL3D::Flags secondPassFlags;
    bool skipBitagnentEvenIfEnabledInFlags;
    Float smoothness;
    Float lineWidth;
    Float lineLength;
    Float multiply;
    const char* file;
} TangentBitangentNormalData[] {
    {"",
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::BitangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection, {},
        false, 2.0f, 1.0f, 0.6f, 1.0f, "tbn.tga"},
    {"bitangents from tangents",
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection, {},
        false, 2.0f, 1.0f, 0.6f, 1.0f, "tbn.tga"},
    {"scaled data",
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::BitangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection, {},
        false, 2.0f, 1.0f, 0.6f, 5.0f, "tbn.tga"},
    {"wide blurry lines",
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::BitangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection, {},
        false, 5.0f, 5.0f, 0.8f, 1.0f, "tbn-wide.tga"},
    {"only bitangent from tangent",
        MeshVisualizerGL3D::Flag::BitangentFromTangentDirection, {},
        false, 2.0f, 1.0f, 0.6f, 1.0f, "bitangents-from-tangents.tga"},
    {"wireframe + primitive ID + tangents + normals, single pass",
        MeshVisualizerGL3D::Flag::Wireframe|
        MeshVisualizerGL3D::Flag::PrimitiveId|
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection, {},
        false, 2.0f, 1.0f, 0.6f, 1.0f, "wireframe-primitiveid-tn.tga"},
    {"wireframe + primitive ID, rendering all, but only tangents + normals present",
        MeshVisualizerGL3D::Flag::Wireframe|
        MeshVisualizerGL3D::Flag::PrimitiveId|
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::BitangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection, {},
        true, 2.0f, 1.0f, 0.6f, 1.0f, "wireframe-primitiveid-tn.tga"},
    {"wireframe + tangents + normals, two passes",
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection,
        MeshVisualizerGL3D::Flag::Wireframe,
        false, 2.0f, 1.0f, 0.6f, 1.0f, "wireframe-tn-smooth.tga"},
    {"primitive ID + tangents + normals",
        MeshVisualizerGL3D::Flag::PrimitiveId|
        MeshVisualizerGL3D::Flag::TangentDirection|
        MeshVisualizerGL3D::Flag::NormalDirection, {},
        false, 2.0f, 1.0f, 0.6f, 1.0f, "primitiveid-tn.tga"}
};
#endif

#ifndef MAGNUM_TARGET_GLES2
constexpr struct {
    const char* name;
    const char* expected;
    MeshVisualizerGL2D::Flags flags;
    UnsignedInt materialCount, drawCount;
    UnsignedInt uniformIncrement;
    Float maxThreshold, meanThreshold;
} RenderMultiData2D[] {
    #ifndef MAGNUM_TARGET_WEBGL
    {"bind with offset, wireframe", "multidraw-wireframe2D.tga",
        MeshVisualizerGL2D::Flag::Wireframe,
        1, 1, 16,
        /* Minor differences on ARM Mali */
        0.67f, 0.01f},
    #endif
    {"bind with offset, w/o GS", "multidraw-wireframe-nogeo2D.tga",
        MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader,
        1, 1, 16,
        /* Minor differences on ARM Mali */
        0.67f, 0.02f},
    {"bind with offset, vertex ID", "multidraw-vertexid2D.tga",
        MeshVisualizerGL2D::Flag::VertexId,
        1, 1, 16,
        /* Minor differences on ARM Mali */
        0.67f, 0.01f},
    #ifndef MAGNUM_TARGET_WEBGL
    {"draw offset, wireframe", "multidraw-wireframe2D.tga",
        MeshVisualizerGL2D::Flag::Wireframe,
        2, 3, 1,
        /* Minor differences on ARM Mali */
        0.67f, 0.01f},
    #endif
    {"draw offset, wireframe w/o GS", "multidraw-wireframe-nogeo2D.tga",
        MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader,
        2, 3, 1,
        /* Minor differences on ARM Mali */
        0.67f, 0.02f},
    {"draw offset, vertex ID", "multidraw-vertexid2D.tga",
        MeshVisualizerGL2D::Flag::VertexId,
        2, 3, 1,
        /* Minor differences on ARM Mali */
        0.67f, 0.01f},
};

constexpr struct {
    const char* name;
    const char* expected;
    MeshVisualizerGL3D::Flags flags;
    UnsignedInt materialCount, drawCount;
    UnsignedInt uniformIncrement;
    Float maxThreshold, meanThreshold;
} RenderMultiData3D[] {
    #ifndef MAGNUM_TARGET_WEBGL
    {"bind with offset, wireframe", "multidraw-wireframe3D.tga",
        MeshVisualizerGL3D::Flag::Wireframe,
        1, 1, 16, 0.0f, 0.0f},
    {"bind with offset, wireframe + TBN", "multidraw-wireframe-tbn3D.tga",
        MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::NormalDirection,
        1, 1, 16, 0.0f, 0.0f},
    #endif
    {"bind with offset, wireframe w/o GS", "multidraw-wireframe-nogeo3D.tga",
        MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader,
        1, 1, 16,
        /* Minor differences on ARM Mali */
        6.0f, 0.04f},
    {"bind with offset, vertex ID", "multidraw-vertexid3D.tga",
        MeshVisualizerGL3D::Flag::VertexId,
        1, 1, 16,
        /* Minor differences on ARM Mali */
        0.67f, 0.01f},
    #ifndef MAGNUM_TARGET_WEBGL
    {"draw offset, wireframe", "multidraw-wireframe3D.tga",
        MeshVisualizerGL3D::Flag::Wireframe,
        2, 3, 1, 0.0f, 0.0f},
    {"draw offset, wireframe + TBN", "multidraw-wireframe-tbn3D.tga",
        MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::NormalDirection,
        2, 3, 1, 0.0f, 0.0f},
    #endif
    {"draw offset, wireframe w/o GS", "multidraw-wireframe-nogeo3D.tga",
        MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader,
        2, 3, 1,
        /* Minor differences on ARM Mali */
        6.0f, 0.04f},
    {"draw offset, vertex ID", "multidraw-vertexid3D.tga",
        MeshVisualizerGL3D::Flag::VertexId,
        2, 3, 1,
        /* Minor differences on ARM Mali */
        0.67f, 0.01f},
};
#endif

MeshVisualizerGLTest::MeshVisualizerGLTest() {
    addInstancedTests({&MeshVisualizerGLTest::construct2D},
        Containers::arraySize(ConstructData2D));

    #ifndef MAGNUM_TARGET_GLES2
    addInstancedTests({&MeshVisualizerGLTest::constructUniformBuffers2D},
        Containers::arraySize(ConstructUniformBuffersData2D));
    #endif

    addInstancedTests({&MeshVisualizerGLTest::construct3D},
        Containers::arraySize(ConstructData3D));

    #ifndef MAGNUM_TARGET_GLES2
    addInstancedTests({&MeshVisualizerGLTest::constructUniformBuffers3D},
        Containers::arraySize(ConstructUniformBuffersData3D));
    #endif

    addInstancedTests({&MeshVisualizerGLTest::construct2DInvalid},
        Containers::arraySize(ConstructInvalidData2D));

    #ifndef MAGNUM_TARGET_GLES2
    addInstancedTests({&MeshVisualizerGLTest::constructUniformBuffers2DInvalid},
        Containers::arraySize(ConstructUniformBuffersInvalidData2D));
    #endif

    addInstancedTests({&MeshVisualizerGLTest::construct3DInvalid},
        Containers::arraySize(ConstructInvalidData3D));

    #ifndef MAGNUM_TARGET_GLES2
    addInstancedTests({&MeshVisualizerGLTest::constructUniformBuffers3DInvalid},
        Containers::arraySize(ConstructUniformBuffersInvalidData3D));
    #endif

    addTests({
        &MeshVisualizerGLTest::constructMove2D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::constructMoveUniformBuffers2D,
        #endif
        &MeshVisualizerGLTest::constructMove3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::constructMoveUniformBuffers3D,
        #endif

        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::setUniformUniformBuffersEnabled2D,
        &MeshVisualizerGLTest::setUniformUniformBuffersEnabled3D,
        &MeshVisualizerGLTest::bindBufferUniformBuffersNotEnabled2D,
        &MeshVisualizerGLTest::bindBufferUniformBuffersNotEnabled3D,
        #endif
        &MeshVisualizerGLTest::setWireframeNotEnabled2D,
        &MeshVisualizerGLTest::setWireframeNotEnabled3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::setColorMapNotEnabled2D,
        &MeshVisualizerGLTest::setColorMapNotEnabled3D,
        #endif
        #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
        &MeshVisualizerGLTest::setTangentBitangentNormalNotEnabled3D,
        #endif
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::setWrongDrawOffset2D,
        &MeshVisualizerGLTest::setWrongDrawOffset3D
        #endif
        });

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    /* MSVC needs explicit type due to default template args */
    addTests<MeshVisualizerGLTest>({
        &MeshVisualizerGLTest::renderDefaultsWireframe2D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsWireframe2D<MeshVisualizerGL2D::Flag::UniformBuffers>,
        #endif
        &MeshVisualizerGLTest::renderDefaultsWireframe3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsWireframe3D<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        },
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);
    #endif

    #ifndef MAGNUM_TARGET_GLES2
    /* MSVC needs explicit type due to default template args */
    addInstancedTests<MeshVisualizerGLTest>({
        &MeshVisualizerGLTest::renderDefaultsObjectId2D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsObjectId2D<MeshVisualizerGL2D::Flag::UniformBuffers>,
        #endif
        &MeshVisualizerGLTest::renderDefaultsObjectId3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsObjectId3D<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        },
        Containers::arraySize(ObjectIdDefaultsData),
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);
    #endif

    #ifndef MAGNUM_TARGET_GLES2
    /* MSVC needs explicit type due to default template args */
    addTests<MeshVisualizerGLTest>({
        &MeshVisualizerGLTest::renderDefaultsVertexId2D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsVertexId2D<MeshVisualizerGL2D::Flag::UniformBuffers>,
        #endif
        &MeshVisualizerGLTest::renderDefaultsVertexId3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsVertexId3D<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        &MeshVisualizerGLTest::renderDefaultsPrimitiveId2D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsPrimitiveId2D<MeshVisualizerGL2D::Flag::UniformBuffers>,
        #endif
        &MeshVisualizerGLTest::renderDefaultsPrimitiveId3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsPrimitiveId3D<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        #ifndef MAGNUM_TARGET_WEBGL
        &MeshVisualizerGLTest::renderDefaultsTangentBitangentNormal,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderDefaultsTangentBitangentNormal<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        #endif
        },
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);
    #endif

    /* MSVC needs explicit type due to default template args */
    addInstancedTests<MeshVisualizerGLTest>({
        &MeshVisualizerGLTest::renderWireframe2D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderWireframe2D<MeshVisualizerGL2D::Flag::UniformBuffers>,
        #endif
        },
        Containers::arraySize(WireframeData2D),
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);

    /* MSVC needs explicit type due to default template args */
    addInstancedTests<MeshVisualizerGLTest>({
        &MeshVisualizerGLTest::renderWireframe3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderWireframe3D<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        },
        Containers::arraySize(WireframeData3D),
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);

    #ifndef MAGNUM_TARGET_GLES2
    /* MSVC needs explicit type due to default template args */
    addInstancedTests<MeshVisualizerGLTest>({
        &MeshVisualizerGLTest::renderObjectVertexPrimitiveId2D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderObjectVertexPrimitiveId2D<MeshVisualizerGL2D::Flag::UniformBuffers>,
        #endif
        &MeshVisualizerGLTest::renderObjectVertexPrimitiveId3D,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderObjectVertexPrimitiveId3D<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        },
        Containers::arraySize(ObjectVertexPrimitiveIdData),
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    addTests({&MeshVisualizerGLTest::renderWireframe3DPerspective},
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);

    /* MSVC needs explicit type due to default template args */
    addInstancedTests<MeshVisualizerGLTest>({
        &MeshVisualizerGLTest::renderTangentBitangentNormal,
        #ifndef MAGNUM_TARGET_GLES2
        &MeshVisualizerGLTest::renderTangentBitangentNormal<MeshVisualizerGL3D::Flag::UniformBuffers>,
        #endif
        },
        Containers::arraySize(TangentBitangentNormalData),
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);
    #endif

    #ifndef MAGNUM_TARGET_GLES2
    addInstancedTests({&MeshVisualizerGLTest::renderMulti2D},
        Containers::arraySize(RenderMultiData2D),
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);

    addInstancedTests({&MeshVisualizerGLTest::renderMulti3D},
        Containers::arraySize(RenderMultiData3D),
        &MeshVisualizerGLTest::renderSetup,
        &MeshVisualizerGLTest::renderTeardown);
    #endif

    /* Load the plugins directly from the build tree. Otherwise they're either
       static and already loaded or not present in the build tree */
    #ifdef ANYIMAGEIMPORTER_PLUGIN_FILENAME
    CORRADE_INTERNAL_ASSERT_OUTPUT(_manager.load(ANYIMAGEIMPORTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
    #endif
    #ifdef TGAIMPORTER_PLUGIN_FILENAME
    CORRADE_INTERNAL_ASSERT_OUTPUT(_manager.load(TGAIMPORTER_PLUGIN_FILENAME) & PluginManager::LoadState::Loaded);
    #endif

    #ifdef CORRADE_TARGET_APPLE
    if(Utility::Directory::isSandboxed()
        #if defined(CORRADE_TARGET_IOS) && defined(CORRADE_TESTSUITE_TARGET_XCTEST)
        /** @todo Fix this once I persuade CMake to run XCTest tests properly */
        && std::getenv("SIMULATOR_UDID")
        #endif
    ) {
        _testDir = Utility::Directory::path(Utility::Directory::executableLocation());
    } else
    #endif
    {
        _testDir = SHADERS_TEST_DIR;
    }

    /* Set up a color map texture for use by object / primitive ID tests */
    #ifndef MAGNUM_TARGET_GLES2
    {
        const auto map = DebugTools::ColorMap::turbo();
        const Vector2i size{Int(map.size()), 1};
        _colorMapTexture
            .setMinificationFilter(SamplerFilter::Linear)
            .setMagnificationFilter(SamplerFilter::Linear)
            .setWrapping(SamplerWrapping::Repeat)
            .setStorage(1, GL::TextureFormat::RGB8, size)
            .setSubImage(0, {}, ImageView2D{PixelFormat::RGB8Srgb, size, map});
    }
    #endif
}

void MeshVisualizerGLTest::construct2D() {
    auto&& data = ConstructData2D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES
    if((data.flags & MeshVisualizerGL2D::Flag::InstancedObjectId) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(data.flags >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL300)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
        #endif
    ) CORRADE_SKIP("gl_VertexID not supported.");
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(data.flags & MeshVisualizerGL2D::Flag::PrimitiveId && !(data.flags >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId) &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL320)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES320)
        #endif
    ) CORRADE_SKIP("gl_PrimitiveID not supported.");
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if((data.flags & MeshVisualizerGL2D::Flag::Wireframe) && !(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader)) {
        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
            CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
        #else
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
            CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
        #endif

        #ifdef MAGNUM_TARGET_GLES
        if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
            CORRADE_INFO("Using" << GL::Extensions::NV::shader_noperspective_interpolation::string());
        #endif
    }
    #endif

    MeshVisualizerGL2D shader{data.flags};
    CORRADE_COMPARE(shader.flags(), data.flags);
    CORRADE_VERIFY(shader.id());
    {
        #ifdef CORRADE_TARGET_APPLE
        CORRADE_EXPECT_FAIL("macOS drivers need insane amount of state to validate properly.");
        #endif
        CORRADE_VERIFY(shader.validate().first);
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
}

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::constructUniformBuffers2D() {
    auto&& data = ConstructUniformBuffersData2D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES
    if((data.flags & MeshVisualizerGL2D::Flag::InstancedObjectId) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if(data.flags >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL300)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
        #endif
    ) CORRADE_SKIP("gl_VertexID not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if(data.flags & MeshVisualizerGL2D::Flag::PrimitiveId && !(data.flags >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId) &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL320)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES320)
        #endif
    ) CORRADE_SKIP("gl_PrimitiveID not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if((data.flags & MeshVisualizerGL2D::Flag::Wireframe) && !(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader)) {
        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
            CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
        #else
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
            CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
        #endif

        #ifdef MAGNUM_TARGET_GLES
        if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
            CORRADE_INFO("Using" << GL::Extensions::NV::shader_noperspective_interpolation::string());
        #endif
    }
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(data.flags & MeshVisualizerGL2D::Flag::UniformBuffers && !GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    MeshVisualizerGL2D shader{data.flags, data.materialCount, data.drawCount};
    CORRADE_COMPARE(shader.flags(), data.flags);
    CORRADE_VERIFY(shader.id());
    {
        #ifdef CORRADE_TARGET_APPLE
        CORRADE_EXPECT_FAIL("macOS drivers need insane amount of state to validate properly.");
        #endif
        CORRADE_VERIFY(shader.validate().first);
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
}
#endif

void MeshVisualizerGLTest::construct3D() {
    auto&& data = ConstructData3D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES
    if((data.flags & MeshVisualizerGL3D::Flag::InstancedObjectId) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(data.flags >= MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL300)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
        #endif
    ) CORRADE_SKIP("gl_VertexID not supported.");
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(data.flags & MeshVisualizerGL3D::Flag::PrimitiveId && !(data.flags >= MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId) &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL320)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES320)
        #endif
    ) CORRADE_SKIP("gl_PrimitiveID not supported.");
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(((data.flags & MeshVisualizerGL3D::Flag::Wireframe) && !(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader)) || (data.flags & (MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::NormalDirection))) {
        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
            CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
        #else
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
            CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
        #endif

        #ifdef MAGNUM_TARGET_GLES
        if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
            CORRADE_INFO("Using" << GL::Extensions::NV::shader_noperspective_interpolation::string());
        #endif
    }
    #endif

    MeshVisualizerGL3D shader{data.flags};
    CORRADE_COMPARE(shader.flags(), data.flags);
    CORRADE_VERIFY(shader.id());
    {
        #ifdef CORRADE_TARGET_APPLE
        CORRADE_EXPECT_FAIL("macOS drivers need insane amount of state to validate properly.");
        #endif
        CORRADE_VERIFY(shader.validate().first);
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
}

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::constructUniformBuffers3D() {
    auto&& data = ConstructUniformBuffersData3D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES
    if((data.flags & MeshVisualizerGL3D::Flag::InstancedObjectId) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if(data.flags >= MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL300)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
        #endif
    ) CORRADE_SKIP("gl_VertexID not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if(data.flags & MeshVisualizerGL3D::Flag::PrimitiveId && !(data.flags >= MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId) &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL320)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES320)
        #endif
    ) CORRADE_SKIP("gl_PrimitiveID not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if(((data.flags & MeshVisualizerGL3D::Flag::Wireframe) && !(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader)) || (data.flags & (MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::NormalDirection))) {
        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
            CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
        #else
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
            CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
        #endif

        #ifdef MAGNUM_TARGET_GLES
        if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
            CORRADE_INFO("Using" << GL::Extensions::NV::shader_noperspective_interpolation::string());
        #endif
    }
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(data.flags & MeshVisualizerGL3D::Flag::UniformBuffers && !GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    MeshVisualizerGL3D shader{data.flags, data.materialCount, data.drawCount};
    CORRADE_COMPARE(shader.flags(), data.flags);
    CORRADE_VERIFY(shader.id());
    {
        #ifdef CORRADE_TARGET_APPLE
        CORRADE_EXPECT_FAIL("macOS drivers need insane amount of state to validate properly.");
        #endif
        CORRADE_VERIFY(shader.validate().first);
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
}
#endif

void MeshVisualizerGLTest::construct2DInvalid() {
    auto&& data = ConstructInvalidData2D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};
    MeshVisualizerGL2D{data.flags};
    CORRADE_COMPARE(out.str(), Utility::formatString("Shaders::MeshVisualizerGL{}\n", data.message));
}

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::constructUniformBuffers2DInvalid() {
    auto&& data = ConstructUniformBuffersInvalidData2D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    std::ostringstream out;
    Error redirectError{&out};
    MeshVisualizerGL2D{data.flags, data.materialCount, data.drawCount};
    CORRADE_COMPARE(out.str(), Utility::formatString("Shaders::MeshVisualizerGL2D: {}\n", data.message));
}
#endif

void MeshVisualizerGLTest::construct3DInvalid() {
    auto&& data = ConstructInvalidData3D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};
    MeshVisualizerGL3D{data.flags};
    CORRADE_COMPARE(out.str(), Utility::formatString("Shaders::MeshVisualizerGL{}\n", data.message));
}

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::constructUniformBuffers3DInvalid() {
    auto&& data = ConstructUniformBuffersInvalidData3D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    std::ostringstream out;
    Error redirectError{&out};
    MeshVisualizerGL3D{data.flags, data.materialCount, data.drawCount};
    CORRADE_COMPARE(out.str(), Utility::formatString("Shaders::MeshVisualizerGL3D: {}\n", data.message));
}
#endif

void MeshVisualizerGLTest::constructMove2D() {
    MeshVisualizerGL2D a{MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader};
    const GLuint id = a.id();
    CORRADE_VERIFY(id);

    MAGNUM_VERIFY_NO_GL_ERROR();

    MeshVisualizerGL2D b{std::move(a)};
    CORRADE_COMPARE(b.id(), id);
    CORRADE_COMPARE(b.flags(), MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader);
    CORRADE_VERIFY(!a.id());

    MeshVisualizerGL2D c{NoCreate};
    c = std::move(b);
    CORRADE_COMPARE(c.id(), id);
    CORRADE_COMPARE(c.flags(), MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader);
    CORRADE_VERIFY(!b.id());
}

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::constructMoveUniformBuffers2D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    MeshVisualizerGL2D a{MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 2, 5};
    const GLuint id = a.id();
    CORRADE_VERIFY(id);

    MAGNUM_VERIFY_NO_GL_ERROR();

    MeshVisualizerGL2D b{std::move(a)};
    CORRADE_COMPARE(b.id(), id);
    CORRADE_COMPARE(b.flags(), MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader);
    CORRADE_COMPARE(b.materialCount(), 2);
    CORRADE_COMPARE(b.drawCount(), 5);
    CORRADE_VERIFY(!a.id());

    MeshVisualizerGL2D c{NoCreate};
    c = std::move(b);
    CORRADE_COMPARE(c.id(), id);
    CORRADE_COMPARE(c.flags(), MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader);
    CORRADE_COMPARE(c.materialCount(), 2);
    CORRADE_COMPARE(c.drawCount(), 5);
    CORRADE_VERIFY(!b.id());
}
#endif

void MeshVisualizerGLTest::constructMove3D() {
    MeshVisualizerGL3D a{MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader};
    const GLuint id = a.id();
    CORRADE_VERIFY(id);

    MAGNUM_VERIFY_NO_GL_ERROR();

    MeshVisualizerGL3D b{std::move(a)};
    CORRADE_COMPARE(b.id(), id);
    CORRADE_COMPARE(b.flags(), MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader);
    CORRADE_VERIFY(!a.id());

    MeshVisualizerGL3D c{NoCreate};
    c = std::move(b);
    CORRADE_COMPARE(c.id(), id);
    CORRADE_COMPARE(c.flags(), MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader);
    CORRADE_VERIFY(!b.id());
}

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::constructMoveUniformBuffers3D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    MeshVisualizerGL3D a{MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 2, 5};
    const GLuint id = a.id();
    CORRADE_VERIFY(id);

    MAGNUM_VERIFY_NO_GL_ERROR();

    MeshVisualizerGL3D b{std::move(a)};
    CORRADE_COMPARE(b.id(), id);
    CORRADE_COMPARE(b.flags(), MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader);
    CORRADE_COMPARE(b.materialCount(), 2);
    CORRADE_COMPARE(b.drawCount(), 5);
    CORRADE_VERIFY(!a.id());

    MeshVisualizerGL3D c{NoCreate};
    c = std::move(b);
    CORRADE_COMPARE(c.id(), id);
    CORRADE_COMPARE(c.flags(), MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader);
    CORRADE_COMPARE(c.materialCount(), 2);
    CORRADE_COMPARE(c.drawCount(), 5);
    CORRADE_VERIFY(!b.id());
}
#endif

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::setUniformUniformBuffersEnabled2D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    MeshVisualizerGL2D shader{MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader};
    shader.setTransformationProjectionMatrix({})
        /* setViewportSize() works on both UBOs and classic */
        .setColor({})
        .setWireframeColor({})
        .setWireframeWidth({})
        .setColorMapTransformation({}, {})
        .setSmoothness({});
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL2D::setTransformationProjectionMatrix(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setColor(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setWireframeColor(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setWireframeWidth(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setColorMapTransformation(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL2D::setSmoothness(): the shader was created with uniform buffers enabled\n");
}

void MeshVisualizerGLTest::setUniformUniformBuffersEnabled3D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader};
    shader.setProjectionMatrix({})
        .setTransformationMatrix({})
        /* setViewportSize() works on both UBOs and classic */
        .setColor({})
        .setWireframeColor({})
        .setWireframeWidth({})
        .setColorMapTransformation({}, {})
        .setSmoothness({});
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL3D::setProjectionMatrix(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::setTransformationMatrix(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setColor(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setWireframeColor(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setWireframeWidth(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setColorMapTransformation(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::setSmoothness(): the shader was created with uniform buffers enabled\n");

    out.str({});

    #ifndef MAGNUM_TARGET_WEBGL
    shader
        .setNormalMatrix({})
        .setLineWidth({})
        .setLineLength({});
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL3D::setNormalMatrix(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::setLineWidth(): the shader was created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::setLineLength(): the shader was created with uniform buffers enabled\n");
    #endif
}

void MeshVisualizerGLTest::bindBufferUniformBuffersNotEnabled2D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    GL::Buffer buffer;
    MeshVisualizerGL2D shader{MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader};
    shader.bindTransformationProjectionBuffer(buffer)
          .bindTransformationProjectionBuffer(buffer, 0, 16)
          .bindDrawBuffer(buffer)
          .bindDrawBuffer(buffer, 0, 16)
          .bindMaterialBuffer(buffer)
          .bindMaterialBuffer(buffer, 0, 16)
          .setDrawOffset(0);
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL2D::bindTransformationProjectionBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL2D::bindTransformationProjectionBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL2D::bindDrawBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL2D::bindDrawBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::bindMaterialBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::bindMaterialBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setDrawOffset(): the shader was not created with uniform buffers enabled\n");
}

void MeshVisualizerGLTest::bindBufferUniformBuffersNotEnabled3D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    GL::Buffer buffer;
    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader};
    shader.bindProjectionBuffer(buffer)
          .bindProjectionBuffer(buffer, 0, 16)
          .bindTransformationBuffer(buffer)
          .bindTransformationBuffer(buffer, 0, 16)
          .bindDrawBuffer(buffer)
          .bindDrawBuffer(buffer, 0, 16)
          .bindMaterialBuffer(buffer)
          .bindMaterialBuffer(buffer, 0, 16)
          .setDrawOffset(0);
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL3D::bindProjectionBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::bindProjectionBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::bindTransformationBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::bindTransformationBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::bindDrawBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL3D::bindDrawBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::bindMaterialBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::bindMaterialBuffer(): the shader was not created with uniform buffers enabled\n"
        "Shaders::MeshVisualizerGL::setDrawOffset(): the shader was not created with uniform buffers enabled\n");
}
#endif

void MeshVisualizerGLTest::setWireframeNotEnabled2D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    /* The constructor asserts for at least some feature being enabled (which
       is just wireframe in case of 2D), so fake it with a NoCreate */
    MeshVisualizerGL2D shader{NoCreate};
    shader
        .setColor({});

    #ifndef MAGNUM_TARGET_GLES2
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setColor(): the shader was not created with wireframe or object/vertex/primitive ID enabled\n");
    #else
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setColor(): the shader was not created with wireframe enabled\n");
    #endif

    out.str({});
    shader
        .setWireframeColor({})
        .setWireframeWidth({})
        .setSmoothness({});

    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setWireframeColor(): the shader was not created with wireframe enabled\n"
        "Shaders::MeshVisualizerGL::setWireframeWidth(): the shader was not created with wireframe enabled\n"
        "Shaders::MeshVisualizerGL2D::setSmoothness(): the shader was not created with wireframe enabled\n");
}

void MeshVisualizerGLTest::setWireframeNotEnabled3D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    /* The constructor asserts for at least some feature being enabled (which
       is just wireframe in case we're not on desktop or ES3.2), so fake it
       with a NoCreate */
    MeshVisualizerGL3D shader{NoCreate};
    shader
        .setColor({});

    #ifndef MAGNUM_TARGET_GLES2
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setColor(): the shader was not created with wireframe or object/vertex/primitive ID enabled\n");
    #else
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setColor(): the shader was not created with wireframe enabled\n");
    #endif

    out.str({});
    shader
        .setWireframeColor({})
        .setWireframeWidth({})
        .setSmoothness({});

    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setWireframeColor(): the shader was not created with wireframe enabled\n"
        "Shaders::MeshVisualizerGL::setWireframeWidth(): the shader was not created with wireframe enabled\n"
        "Shaders::MeshVisualizerGL3D::setSmoothness(): the shader was not created with wireframe or TBN direction enabled\n");
}

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::setColorMapNotEnabled2D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    GL::Texture2D texture;
    MeshVisualizerGL2D shader{NoCreate};
    shader.setColorMapTransformation({}, {})
        .bindColorMapTexture(texture);

    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setColorMapTransformation(): the shader was not created with object/vertex/primitive ID enabled\n"
        "Shaders::MeshVisualizerGL::bindColorMapTexture(): the shader was not created with object/vertex/primitive ID enabled\n");
}

void MeshVisualizerGLTest::setColorMapNotEnabled3D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    GL::Texture2D texture;
    MeshVisualizerGL3D shader{NoCreate};
    shader.setColorMapTransformation({}, {})
        .bindColorMapTexture(texture);

    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setColorMapTransformation(): the shader was not created with object/vertex/primitive ID enabled\n"
        "Shaders::MeshVisualizerGL::bindColorMapTexture(): the shader was not created with object/vertex/primitive ID enabled\n");
}
#endif

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
void MeshVisualizerGLTest::setTangentBitangentNormalNotEnabled3D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    std::ostringstream out;
    Error redirectError{&out};

    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::Wireframe};
    shader.setNormalMatrix({})
        .setLineWidth({})
        .setLineLength({});

    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL3D::setNormalMatrix(): the shader was not created with TBN direction enabled\n"
        "Shaders::MeshVisualizerGL3D::setLineWidth(): the shader was not created with TBN direction enabled\n"
        "Shaders::MeshVisualizerGL3D::setLineLength(): the shader was not created with TBN direction enabled\n");
}
#endif

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::setWrongDrawOffset2D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    std::ostringstream out;
    Error redirectError{&out};
    MeshVisualizerGL2D{MeshVisualizerGL2D::Flag::UniformBuffers|MeshVisualizerGL2D::Flag::Wireframe|MeshVisualizerGL2D::Flag::NoGeometryShader, 2, 5}
        .setDrawOffset(5);
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setDrawOffset(): draw offset 5 is out of bounds for 5 draws\n");
}

void MeshVisualizerGLTest::setWrongDrawOffset3D() {
    #ifdef CORRADE_NO_ASSERT
    CORRADE_SKIP("CORRADE_NO_ASSERT defined, can't test assertions");
    #endif

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    std::ostringstream out;
    Error redirectError{&out};
    MeshVisualizerGL3D{MeshVisualizerGL3D::Flag::UniformBuffers|MeshVisualizerGL3D::Flag::Wireframe|MeshVisualizerGL3D::Flag::NoGeometryShader, 2, 5}
        .setDrawOffset(5);
    CORRADE_COMPARE(out.str(),
        "Shaders::MeshVisualizerGL::setDrawOffset(): draw offset 5 is out of bounds for 5 draws\n");
}
#endif

constexpr Vector2i RenderSize{80, 80};

void MeshVisualizerGLTest::renderSetup() {
    /* Pick a color that's directly representable on RGBA4 as well to reduce
       artifacts */
    GL::Renderer::setClearColor(0x111111_rgbf);
    GL::Renderer::enable(GL::Renderer::Feature::FaceCulling);

    _color = GL::Renderbuffer{};
    _color.setStorage(
        #if !defined(MAGNUM_TARGET_GLES2) || !defined(MAGNUM_TARGET_WEBGL)
        GL::RenderbufferFormat::RGBA8,
        #else
        GL::RenderbufferFormat::RGBA4,
        #endif
        RenderSize);
    _depth = GL::Renderbuffer{};
    _depth.setStorage(GL::RenderbufferFormat::DepthComponent16, RenderSize);
    _framebuffer = GL::Framebuffer{{{}, RenderSize}};
    _framebuffer
        .attachRenderbuffer(GL::Framebuffer::ColorAttachment{0}, _color)
        .attachRenderbuffer(GL::Framebuffer::BufferAttachment::Depth, _depth)
        .clear(GL::FramebufferClear::Color|GL::FramebufferClear::Depth)
        .bind();

    /* Disable depth test & blending by default, particular tests enable it if
       needed */
    GL::Renderer::disable(GL::Renderer::Feature::DepthTest);
    GL::Renderer::disable(GL::Renderer::Feature::Blending);
}

void MeshVisualizerGLTest::renderTeardown() {
    _framebuffer = GL::Framebuffer{NoCreate};
    _color = GL::Renderbuffer{NoCreate};
}

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
template<MeshVisualizerGL2D::Flag flag> void MeshVisualizerGLTest::renderDefaultsWireframe2D() {
    if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    #ifdef MAGNUM_TARGET_GLES
    if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
        Debug() << "Using" << GL::Extensions::NV::shader_noperspective_interpolation::string();
    #endif

    GL::Mesh circle = MeshTools::compile(Primitives::circle2DSolid(16));

    MeshVisualizerGL2D shader{MeshVisualizerGL2D::Flag::Wireframe|flag};

    if(flag == MeshVisualizerGL2D::Flag{}) {
        shader.draw(circle);
    } else if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationProjectionUniform2D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform2D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(circle);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    {
        CORRADE_EXPECT_FAIL("Defaults don't work for wireframe as line width is derived from viewport size.");
        CORRADE_COMPARE_WITH(
            /* Dropping the alpha channel, as it's always 1.0 */
            Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
            Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-wireframe2D.tga"),
            (DebugTools::CompareImageToFile{_manager}));
    }

    /** @todo make this unnecessary */
    shader.setViewportSize({80, 80});

    if(flag == MeshVisualizerGL2D::Flag{}) {
        shader.draw(circle);
    } else if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationProjectionUniform2D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform2D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(circle);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-wireframe2D.tga"),
        /* AMD has off-by-one errors on edges compared to Intel */
        (DebugTools::CompareImageToFile{_manager, 1.0f, 0.082f}));
}

template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderDefaultsWireframe3D() {
    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    #ifdef MAGNUM_TARGET_GLES
    if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
        Debug() << "Using" << GL::Extensions::NV::shader_noperspective_interpolation::string();
    #endif

    GL::Mesh sphere = MeshTools::compile(Primitives::icosphereSolid(1));

    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::Wireframe|flag};

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader.draw(sphere);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(sphere);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    {
        CORRADE_EXPECT_FAIL("Defaults don't work for wireframe as line width is derived from viewport size.");
        CORRADE_COMPARE_WITH(
            /* Dropping the alpha channel, as it's always 1.0 */
            Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
            Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-wireframe3D.tga"),
            (DebugTools::CompareImageToFile{_manager}));
    }

    /** @todo make this unnecessary */
    shader.setViewportSize({80, 80});

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader.draw(sphere);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(sphere);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-wireframe3D.tga"),
        /* AMD has off-by-one errors on edges compared to Intel */
        (DebugTools::CompareImageToFile{_manager, 1.0f, 0.06f}));
}
#endif

#ifndef MAGNUM_TARGET_GLES2
template<MeshVisualizerGL2D::Flag flag> void MeshVisualizerGLTest::renderDefaultsObjectId2D() {
    auto&& data = ObjectIdDefaultsData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    /* Configure a texture with preset filtering and wrapping. The goal here is
       that the default config should be filtering/wrapping-independent for the
       first 256 items */
    const auto map = DebugTools::ColorMap::turbo();
    const Vector2i size{Int(map.size()), 1};
    GL::Texture2D colorMapTexture;
    colorMapTexture
        .setMinificationFilter(data.filter)
        .setMagnificationFilter(data.filter)
        .setWrapping(data.wrapping)
        .setStorage(1, GL::TextureFormat::RGB8, size)
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGB8Srgb, size, map});

    /* Generate per-face IDs going from 0 to 240 to cover the whole range */
    Containers::Array<UnsignedInt> ids{16};
    for(std::size_t i = 0; i != ids.size(); ++i) ids[i] = i*16;
    GL::Mesh circle = MeshTools::compile(MeshTools::combineFaceAttributes(
        MeshTools::generateIndices(Primitives::circle2DSolid(16)), {
            Trade::MeshAttributeData{Trade::MeshAttribute::ObjectId,
                Containers::arrayView(ids)}
        }));

    MeshVisualizerGL2D shader{MeshVisualizerGL2D::Flag::InstancedObjectId|flag};
    shader.bindColorMapTexture(colorMapTexture);

    if(flag == MeshVisualizerGL2D::Flag{}) {
        shader.draw(circle);
    } else if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationProjectionUniform2D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform2D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(circle);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-objectid2D.tga"),
        /* SwiftShader has a few rounding errors on edges */
        (DebugTools::CompareImageToFile{_manager, 150.67f, 0.45f}));
}

template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderDefaultsObjectId3D() {
    auto&& data = ObjectIdDefaultsData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    /* Configure a texture with preset filtering and wrapping. The goal here is
       that the default config should be filtering/wrapping-independent for the
       first 256 items */
    const auto map = DebugTools::ColorMap::turbo();
    const Vector2i size{Int(map.size()), 1};
    GL::Texture2D colorMapTexture;
    colorMapTexture
        .setMinificationFilter(data.filter)
        .setMagnificationFilter(data.filter)
        .setWrapping(data.wrapping)
        .setStorage(1, GL::TextureFormat::RGB8, size)
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGB8Srgb, size, map});

    /* Generate per-face IDs going from 0 to 228 to cover the whole range */
    Containers::Array<UnsignedInt> ids{20};
    for(std::size_t i = 0; i != ids.size(); ++i) ids[i] = i*12;
    GL::Mesh icosphere = MeshTools::compile(MeshTools::combineFaceAttributes(
        Primitives::icosphereSolid(0), {
            Trade::MeshAttributeData{Trade::MeshAttribute::ObjectId,
                Containers::arrayView(ids)}
        }));

    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::InstancedObjectId|flag};
    shader.bindColorMapTexture(colorMapTexture);

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader.draw(icosphere);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(icosphere);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-objectid3D.tga"),
        /* SwiftShader has a few rounding errors on edges */
        (DebugTools::CompareImageToFile{_manager, 150.67f, 0.165f}));
}

template<MeshVisualizerGL2D::Flag flag> void MeshVisualizerGLTest::renderDefaultsVertexId2D() {
    if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /* On SwiftShader gl_VertexID doesn't work in this case, skipping */
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::MAGNUM::shader_vertex_id>())
        CORRADE_SKIP("gl_VertexID not supported");

    GL::Mesh circle = MeshTools::compile(Primitives::circle2DSolid(16));

    MeshVisualizerGL2D shader{MeshVisualizerGL2D::Flag::VertexId|flag};
    shader.bindColorMapTexture(_colorMapTexture);

    if(flag == MeshVisualizerGL2D::Flag{}) {
        shader.draw(circle);
    } else if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationProjectionUniform2D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform2D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(circle);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-vertexid2D.tga"),
        (DebugTools::CompareImageToFile{_manager, 1.0f, 0.017f}));
}

template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderDefaultsVertexId3D() {
    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /* On SwiftShader gl_VertexID doesn't work in this case, skipping */
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::MAGNUM::shader_vertex_id>())
        CORRADE_SKIP("gl_VertexID not supported");

    GL::Mesh icosphere = MeshTools::compile(Primitives::icosphereSolid(0));

    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::VertexId|flag};
    shader.bindColorMapTexture(_colorMapTexture);

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader.draw(icosphere);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(icosphere);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-vertexid3D.tga"),
        (DebugTools::CompareImageToFile{_manager, 1.0f, 0.012f}));
}

template<MeshVisualizerGL2D::Flag flag> void MeshVisualizerGLTest::renderDefaultsPrimitiveId2D() {
    if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /* Interestingly in this case gl_VertexID in SwiftShader works (thus not
       checking for MAGNUM_shader_vertex_id -- maybe it works only for
       nonindexed triangle draws? */
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL300)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
        #endif
    ) CORRADE_SKIP("gl_VertexID not supported.");
    #endif

    MeshVisualizerGL2D::Flags flags;
    #ifdef MAGNUM_TARGET_WEBGL
    flags = MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId;
    #else
    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isVersionSupported(GL::Version::GL320))
    #else
    if(!GL::Context::current().isVersionSupported(GL::Version::GLES320))
    #endif
    {
        Debug{} << "Using primitive ID from vertex ID";
        flags = MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId;
    }
    else flags = MeshVisualizerGL2D::Flag::PrimitiveId;
    #endif

    Trade::MeshData circleData = Primitives::circle2DSolid(16);
    if(flags >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId)
        circleData = MeshTools::duplicate(MeshTools::generateIndices(circleData));

    GL::Mesh circle = MeshTools::compile(circleData);

    MeshVisualizerGL2D shader{flags|flag};
    shader.bindColorMapTexture(_colorMapTexture);

    if(flag == MeshVisualizerGL2D::Flag{}) {
        shader.draw(circle);
    } else if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationProjectionUniform2D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform2D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(circle);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-primitiveid2D.tga"),
        /* SwiftShader has a few rounding errors on edges */
        (DebugTools::CompareImageToFile{_manager, 76.67f, 0.23f}));
}

template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderDefaultsPrimitiveId3D() {
    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /* Interestingly in this case gl_VertexID in SwiftShader works (thus not
       checking for MAGNUM_shader_vertex_id -- maybe it works only for
       nonindexed triangle draws? */
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL300)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
        #endif
    ) CORRADE_SKIP("gl_VertexID not supported.");
    #endif

    MeshVisualizerGL3D::Flags flags;
    #ifdef MAGNUM_TARGET_WEBGL
    flags = MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId;
    #else
    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isVersionSupported(GL::Version::GL320))
    #else
    if(!GL::Context::current().isVersionSupported(GL::Version::GLES320))
    #endif
    {
        Debug{} << "Using primitive ID from vertex ID";
        flags = MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId;
    }
    else flags = MeshVisualizerGL3D::Flag::PrimitiveId;
    #endif

    Trade::MeshData icosphereData = Primitives::icosphereSolid(0);
    if(flags >= MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId)
        icosphereData = MeshTools::duplicate(icosphereData);

    GL::Mesh icosphere = MeshTools::compile(icosphereData);

    MeshVisualizerGL3D shader{flags|flag};
    shader.bindColorMapTexture(_colorMapTexture);

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader.draw(icosphere);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(icosphere);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-primitiveid3D.tga"),
        /* SwiftShader has a few rounding errors on edges */
        (DebugTools::CompareImageToFile{_manager, 88.34f, 0.071f}));
}
#endif

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderDefaultsTangentBitangentNormal() {
    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    GL::Mesh sphere = MeshTools::compile(Primitives::uvSphereSolid(4, 8,
        Primitives::UVSphereFlag::Tangents));

    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::TangentDirection|
            MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|
            MeshVisualizerGL3D::Flag::NormalDirection|flag};
    /** @todo make this unnecessary */
    shader.setViewportSize({80, 80});

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader.draw(sphere);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
        }};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(sphere);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-tbn.tga"),
        /* AMD has off-by-one errors on edges compared to Intel */
        (DebugTools::CompareImageToFile{_manager, 1.0f, 0.06f}));
}
#endif

template<MeshVisualizerGL2D::Flag flag> void MeshVisualizerGLTest::renderWireframe2D() {
    auto&& data = WireframeData2D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES2
    if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    #ifndef MAGNUM_TARGET_GLES
    if(!(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    #ifdef MAGNUM_TARGET_GLES
    if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
        Debug() << "Using" << GL::Extensions::NV::shader_noperspective_interpolation::string();
    #endif
    #endif

    const Trade::MeshData circleData = Primitives::circle2DSolid(16);

    GL::Mesh circle{NoCreate};
    if(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader) {
        /* Duplicate the vertices. The circle primitive is  */
        const Trade::MeshData circleDataIndexed =
            MeshTools::generateIndices(circleData);
        circle = MeshTools::compile(MeshTools::duplicate(circleDataIndexed));

        /* Supply also the vertex ID, if needed */
        #ifndef MAGNUM_TARGET_GLES2
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::MAGNUM::shader_vertex_id>())
        #endif
        {
            Containers::Array<Float> vertexIndex{circleDataIndexed.indexCount()};
            std::iota(vertexIndex.begin(), vertexIndex.end(), 0.0f);

            GL::Buffer vertexId;
            vertexId.setData(vertexIndex);
            circle.addVertexBuffer(std::move(vertexId), 0, MeshVisualizerGL2D::VertexIndex{});
        }
    } else circle = MeshTools::compile(circleData);

    MeshVisualizerGL2D shader{data.flags|MeshVisualizerGL2D::Flag::Wireframe|flag};
    shader.setViewportSize({80, 80});

    if(flag == MeshVisualizerGL2D::Flag{}) {
        shader
            .setColor(0xffff99_rgbf)
            .setWireframeColor(0x9999ff_rgbf)
            .setWireframeWidth(data.width)
            .setSmoothness(data.smoothness)
            .setTransformationProjectionMatrix(Matrix3::projection({2.1f, 2.1f}))
            .draw(circle);
    }
    #ifndef MAGNUM_TARGET_GLES2
    else if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationProjectionUniform2D{}
                .setTransformationProjectionMatrix(Matrix3::projection({2.1f, 2.1f}))
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform2D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
            .setColor(0xffff99_rgbf)
            .setWireframeColor(0x9999ff_rgbf)
            .setWireframeWidth(data.width)
            .setSmoothness(data.smoothness)
        }};
        shader
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(circle);
    }
    #endif
    else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    {
        CORRADE_EXPECT_FAIL_IF(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader,
            "Line width is currently not configurable w/o geometry shader.");
        #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
        /* SwiftShader has differently rasterized edges on four pixels */
        const Float maxThreshold = 170.0f, meanThreshold = 0.327f;
        #else
        /* WebGL 1 doesn't have 8bit renderbuffer storage, so it's way worse */
        const Float maxThreshold = 170.0f, meanThreshold = 1.699f;
        #endif
        CORRADE_COMPARE_WITH(
            /* Dropping the alpha channel, as it's always 1.0 */
            Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
            Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.file}),
            (DebugTools::CompareImageToFile{_manager, maxThreshold, meanThreshold}));
    }

    /* Test it's not *too* off, at least */
    if(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader) {
        #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
        /* SwiftShader has differently rasterized edges on four pixels. Apple
           A8 on more. */
        const Float maxThreshold = 170.0f, meanThreshold = 0.330f;
        #else
        /* WebGL 1 doesn't have 8bit renderbuffer storage, so it's way worse */
        const Float maxThreshold = 170.0f, meanThreshold = 2.077f;
        #endif
        CORRADE_COMPARE_WITH(
            /* Dropping the alpha channel, as it's always 1.0 */
            Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
            Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.fileXfail}),
            (DebugTools::CompareImageToFile{_manager, maxThreshold, meanThreshold}));
    }
}

template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderWireframe3D() {
    auto&& data = WireframeData3D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES2
    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }
    #endif

    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    #ifndef MAGNUM_TARGET_GLES
    if(!(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    #ifdef MAGNUM_TARGET_GLES
    if(GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
        Debug() << "Using" << GL::Extensions::NV::shader_noperspective_interpolation::string();
    #endif
    #endif

    const Trade::MeshData sphereData = Primitives::icosphereSolid(1);

    GL::Mesh sphere{NoCreate};
    if(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader) {
        /* Duplicate the vertices */
        sphere = MeshTools::compile(MeshTools::duplicate(sphereData));

        /* Supply also the vertex ID, if needed */
        #ifndef MAGNUM_TARGET_GLES2
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::MAGNUM::shader_vertex_id>())
        #endif
        {
            Containers::Array<Float> vertexIndex{sphereData.indexCount()};
            std::iota(vertexIndex.begin(), vertexIndex.end(), 0.0f);

            GL::Buffer vertexId;
            vertexId.setData(vertexIndex);
            sphere.addVertexBuffer(std::move(vertexId), 0, MeshVisualizerGL3D::VertexIndex{});
        }
    } else sphere = MeshTools::compile(sphereData);

    MeshVisualizerGL3D shader{data.flags|MeshVisualizerGL3D::Flag::Wireframe|flag};
    shader.setViewportSize({80, 80});

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader
            .setColor(0xffff99_rgbf)
            .setWireframeColor(0x9999ff_rgbf)
            .setWireframeWidth(data.width)
            .setSmoothness(data.smoothness)
            .setTransformationMatrix(
                Matrix4::translation(Vector3::zAxis(-2.15f))*
                Matrix4::rotationY(-15.0_degf)*
                Matrix4::rotationX(15.0_degf))
            .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
            .draw(sphere);
    }
    #ifndef MAGNUM_TARGET_GLES2
    else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
                .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
                .setTransformationMatrix(
                    Matrix4::translation(Vector3::zAxis(-2.15f))*
                    Matrix4::rotationY(-15.0_degf)*
                    Matrix4::rotationX(15.0_degf)
                )
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerMaterialUniform{}
                .setColor(0xffff99_rgbf)
                .setWireframeColor(0x9999ff_rgbf)
                .setWireframeWidth(data.width)
                .setSmoothness(data.smoothness)
        }};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(sphere);
    }
    #endif
    else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    {
        CORRADE_EXPECT_FAIL_IF(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader,
            "Line width is currently not configurable w/o geometry shader.");
        #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
        /* SwiftShader has differently rasterized edges on four pixels. On a
           GS, if GL_NV_shader_noperspective_interpolation is not supported,
           the artifacts are bigger. */
        Float maxThreshold = 170.0f, meanThreshold = 0.327f;
        #if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
        if(!(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>())
            meanThreshold = 2.166f;
        #endif
        #else
        /* WebGL 1 doesn't have 8bit renderbuffer storage, so it's way worse */
        const Float maxThreshold = 170.0f, meanThreshold = 1.699f;
        #endif
        CORRADE_COMPARE_WITH(
            /* Dropping the alpha channel, as it's always 1.0 */
            Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
            Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.file}),
            (DebugTools::CompareImageToFile{_manager, maxThreshold, meanThreshold}));
    }

    /* Test it's not *too* off, at least */
    if(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader) {
        #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
        /* SwiftShader has differently rasterized edges on four pixels. Apple
           A8 on more. */
        const Float maxThreshold = 170.0f, meanThreshold = 0.330f;
        #else
        /* WebGL 1 doesn't have 8bit renderbuffer storage, so it's way worse */
        const Float maxThreshold = 170.0f, meanThreshold = 1.699f;
        #endif
        CORRADE_COMPARE_WITH(
            /* Dropping the alpha channel, as it's always 1.0 */
            Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
            Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.fileXfail}),
            (DebugTools::CompareImageToFile{_manager, maxThreshold, meanThreshold}));
    }
}

#ifndef MAGNUM_TARGET_GLES2
template<MeshVisualizerGL2D::Flag flag> void MeshVisualizerGLTest::renderObjectVertexPrimitiveId2D() {
    auto&& data = ObjectVertexPrimitiveIdData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if((data.flags2D & MeshVisualizerGL2D::Flag::InstancedObjectId) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    /* Interestingly for PrimitiveIdFromVertexId gl_VertexID in SwiftShader
       works -- maybe it works only for nonindexed triangle draws? */
    if(data.flags2D & MeshVisualizerGL2D::Flag::VertexId && !GL::Context::current().isExtensionSupported<GL::Extensions::MAGNUM::shader_vertex_id>())
        CORRADE_SKIP("gl_VertexID not supported");

    #ifndef MAGNUM_TARGET_WEBGL
    if(data.flags2D & MeshVisualizerGL2D::Flag::PrimitiveId && !(data.flags2D >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId) &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL320)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES320)
        #endif
    ) CORRADE_SKIP("gl_PrimitiveID not supported.");

    #ifndef MAGNUM_TARGET_GLES
    if(data.flags2D & MeshVisualizerGL2D::Flag::Wireframe && !(data.flags2D & MeshVisualizerGL2D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(data.flags2D & MeshVisualizerGL2D::Flag::Wireframe && !(data.flags2D & MeshVisualizerGL2D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif
    #endif

    Trade::MeshData circleData = Primitives::circle2DSolid(16);

    if(data.flags2D & MeshVisualizerGL2D::Flag::InstancedObjectId) {
        Containers::Array<UnsignedInt> ids{16};
        /* Each two faces share the same ID */
        for(std::size_t i = 0; i != ids.size(); ++i) ids[i] = i/2;
        circleData = MeshTools::combineFaceAttributes(
            MeshTools::generateIndices(circleData), {
                Trade::MeshAttributeData{Trade::MeshAttribute::ObjectId,
                    Containers::arrayView(ids)}
            });
    }

    /* Duplicate the data if using primitive ID from vertex ID or if geometry
       shader is disabled */
    if(data.flags2D >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId)
        circleData = MeshTools::generateIndices(circleData);
    if(data.flags2D >= MeshVisualizerGL2D::Flag::PrimitiveIdFromVertexId ||
       data.flags2D & MeshVisualizerGL2D::Flag::NoGeometryShader) {
        if(circleData.primitive() != MeshPrimitive::Triangles)
            circleData = MeshTools::generateIndices(circleData);
        circleData = MeshTools::duplicate(circleData);
    }

    GL::Mesh circle = MeshTools::compile(circleData);

    MeshVisualizerGL2D shader{data.flags2D|flag};
    shader
        /* Shouldn't assert (nor warn) when wireframe is not enabled */
        .setViewportSize({80, 80})
        .bindColorMapTexture(_colorMapTexture);

    if(flag == MeshVisualizerGL2D::Flag{}) {
        /* Remove blue so it's clear the (wireframe) background and mapped ID
           colors got mixed */
        shader.setColor(0xffff00_rgbf)
            .setTransformationProjectionMatrix(Matrix3::projection({2.1f, 2.1f}));
        /* OTOH the wireframe color should stay at full channels, not mixed */
        if(data.flags3D & MeshVisualizerGL3D::Flag::Wireframe)
            shader.setWireframeColor(0xffffff_rgbf);
        /* For vertex ID we don't want any repeat/wraparound as that causes
           disruptions in the gradient and test failures. There's 17 vertices
           also. */
        if(data.flags2D & MeshVisualizerGL2D::Flag::VertexId)
            shader.setColorMapTransformation(1.0f, -1.0f/17.0f);
        /* For object/primitive ID there's no gradient so a wraparound is okay.
           This should cover the first half of the colormap, in reverse order;
           for primitive ID the whole colormap due to the repeat wrapping */
        else
            shader.setColorMapTransformation(0.5f, -1.0f/16.0f);
        shader.draw(circle);
    } else if(flag == MeshVisualizerGL2D::Flag::UniformBuffers) {
        /* See above for comments */
        GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationProjectionUniform2D{}
                .setTransformationProjectionMatrix(Matrix3::projection({2.1f, 2.1f}))
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform2D{}
        }};
        MeshVisualizerMaterialUniform materialUniformData[1];
        materialUniformData->setColor(0xffff00_rgbf);
        if(data.flags3D & MeshVisualizerGL3D::Flag::Wireframe)
            materialUniformData->setWireframeColor(0xffffff_rgbf);
        if(data.flags2D & MeshVisualizerGL2D::Flag::VertexId)
            materialUniformData->setColorMapTransformation(1.0f, -1.0f/17.0f);
        else
            materialUniformData->setColorMapTransformation(0.5f, -1.0f/16.0f);
        GL::Buffer materialUniform{materialUniformData};
        shader
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(circle);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.file2D}),
        /* AMD has slight off-by-one errors compared to Intel, SwiftShader a
           bit more */
        (DebugTools::CompareImageToFile{_manager, 4.0f, 0.141f}));
}

template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderObjectVertexPrimitiveId3D() {
    auto&& data = ObjectVertexPrimitiveIdData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if((data.flags3D & MeshVisualizerGL3D::Flag::InstancedObjectId) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::gpu_shader4>())
        CORRADE_SKIP(GL::Extensions::EXT::gpu_shader4::string() << "is not supported.");
    #endif

    /* Interestingly for PrimitiveIdFromVertexId gl_VertexID in SwiftShader
       works -- maybe it works only for nonindexed triangle draws? */
    if(data.flags3D & MeshVisualizerGL3D::Flag::VertexId && !GL::Context::current().isExtensionSupported<GL::Extensions::MAGNUM::shader_vertex_id>())
        CORRADE_SKIP("gl_VertexID not supported");

    #ifndef MAGNUM_TARGET_WEBGL
    if(data.flags3D & MeshVisualizerGL3D::Flag::PrimitiveId && !(data.flags3D >= MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId) &&
        #ifndef MAGNUM_TARGET_GLES
        !GL::Context::current().isVersionSupported(GL::Version::GL320)
        #else
        !GL::Context::current().isVersionSupported(GL::Version::GLES320)
        #endif
    ) CORRADE_SKIP("gl_PrimitiveID not supported.");

    #ifndef MAGNUM_TARGET_GLES
    if(data.flags3D & MeshVisualizerGL3D::Flag::Wireframe && !(data.flags3D & MeshVisualizerGL3D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(data.flags3D & MeshVisualizerGL3D::Flag::Wireframe && !(data.flags3D & MeshVisualizerGL3D::Flag::NoGeometryShader) && !GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif
    #endif

    Trade::MeshData icosphereData = Primitives::icosphereSolid(1);

    if(data.flags3D & MeshVisualizerGL3D::Flag::InstancedObjectId) {
        Containers::Array<UnsignedInt> ids{80};
        /* Each four faces share the same ID */
        for(std::size_t i = 0; i != ids.size(); ++i) ids[i] = i/4;
        icosphereData = MeshTools::combineFaceAttributes(
            icosphereData, {
                Trade::MeshAttributeData{Trade::MeshAttribute::ObjectId,
                    Containers::arrayView(ids)}
            });
    }

    /* Duplicate the data if using primitive ID from vertex ID or if geometry
       shader is disabled */
    if(data.flags3D >= MeshVisualizerGL3D::Flag::PrimitiveIdFromVertexId ||
       data.flags3D & MeshVisualizerGL3D::Flag::NoGeometryShader)
        icosphereData = MeshTools::duplicate(icosphereData);

    GL::Mesh icosphere = MeshTools::compile(icosphereData);

    MeshVisualizerGL3D shader{data.flags3D|flag};
    shader
        /* Shouldn't assert (nor warn) when wireframe is not enabled */
        .setViewportSize({80, 80})
        .bindColorMapTexture(_colorMapTexture);

    if(flag == MeshVisualizerGL3D::Flag{}) {
        /* Remove blue so it's clear the wireframe background and mapped ID
           colors got mixed */
        shader.setColor(0xffff00_rgbf)
            .setTransformationMatrix(
                Matrix4::translation(Vector3::zAxis(-2.15f))*
                Matrix4::rotationY(-15.0_degf)*
                Matrix4::rotationX(15.0_degf))
            .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f));
        /* OTOH the wireframe color should stay at full channels, not mixed */
        if(data.flags2D & MeshVisualizerGL2D::Flag::Wireframe)
            shader.setWireframeColor(0xffffff_rgbf);
        /* For vertex ID we don't want any repeat/wraparound as that causes
           disruptions in the gradient and test failures. There's 42 vertices
           also. */
        if(data.flags2D & MeshVisualizerGL2D::Flag::VertexId)
            shader.setColorMapTransformation(1.0f, -1.0f/42.0f);
        /* For object/primitive ID there's no gradient so a wraparound is okay.
           This should cover the first half of the colormap, in reverse order;
           for primitive ID the whole colormap due to the repeat wrapping */
        else
            shader.setColorMapTransformation(0.5f, -1.0f/40.0f);
        shader.draw(icosphere);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        /* See above for comments */
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
                .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
                .setTransformationMatrix(
                    Matrix4::translation(Vector3::zAxis(-2.15f))*
                    Matrix4::rotationY(-15.0_degf)*
                    Matrix4::rotationX(15.0_degf)
                )
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
        }};
        MeshVisualizerMaterialUniform materialUniformData[1];
        materialUniformData->setColor(0xffff00_rgbf);
        if(data.flags3D & MeshVisualizerGL3D::Flag::Wireframe)
            materialUniformData->setWireframeColor(0xffffff_rgbf);
        if(data.flags2D & MeshVisualizerGL2D::Flag::VertexId)
            materialUniformData->setColorMapTransformation(1.0f, -1.0f/42.0f);
        else
            materialUniformData->setColorMapTransformation(0.5f, -1.0f/40.0f);
        GL::Buffer materialUniform{materialUniformData};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(icosphere);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /* Release build has 1 pixel slightly off. Huh. AMD & llvmpipe has
       additional off-by-one errors compared to Intel, SwiftShader some errors
       on the edges. If GL_NV_shader_noperspective_interpolation is not
       supported, the artifacts are bigger when wireframe is enabled. */
    Float maxThreshold = 138.4f, meanThreshold = 0.279f;
    #if defined(MAGNUM_TARGET_GLES) && !defined(MAGNUM_TARGET_WEBGL)
    if(data.flags3D & MeshVisualizerGL3D::Flag::Wireframe && !GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>()) {
        /* SwiftShader has a bit more rounding errors */
        maxThreshold = 238.0f;
        meanThreshold = 1.957f;
    }
    #endif
    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.file3D}),
        (DebugTools::CompareImageToFile{_manager, maxThreshold, meanThreshold}));
}
#endif

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
void MeshVisualizerGLTest::renderWireframe3DPerspective() {
    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    GL::Mesh plane = MeshTools::compile(Primitives::planeSolid());

    MeshVisualizerGL3D{MeshVisualizerGL3D::Flag::Wireframe}
        .setWireframeWidth(8.0f)
        .setWireframeColor(0xff0000_rgbf)
        .setViewportSize({80, 80})
        .setTransformationMatrix(
            Matrix4::translation({0.0f, 0.5f, -3.5f})*
            Matrix4::rotationX(-60.0_degf)*
            Matrix4::scaling(Vector3::yScale(2.0f)))
        .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
        .draw(plane);

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    #ifdef MAGNUM_TARGET_GLES
    CORRADE_EXPECT_FAIL_IF(!GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>(),
        "GL_NV_shader_noperspective_interpolation not available.");
    #endif

    /* Slight rasterization differences on AMD. */
    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/wireframe-perspective.tga"),
        (DebugTools::CompareImageToFile{_manager, 0.667f, 0.002f}));
}

template<MeshVisualizerGL3D::Flag flag> void MeshVisualizerGLTest::renderTangentBitangentNormal() {
    auto&& data = TangentBitangentNormalData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        setTestCaseTemplateName("Flag::UniformBuffers");

        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
            CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
        #endif
    }

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    GL::Renderer::enable(GL::Renderer::Feature::DepthTest);
    GL::Renderer::enable(GL::Renderer::Feature::Blending);
    GL::Renderer::setBlendFunction(GL::Renderer::BlendFunction::One, GL::Renderer::BlendFunction::OneMinusSourceAlpha);

    /* Creating a primitive from scratch because Primitives::planeSolid() is
       too regular to test everything properly */
    struct Vertex {
        Vector3 position;
        Vector4 tangent;
        Vector3 bitangent;
        Vector3 normal;
    } vertexData[] {
        {{ 1.0f, -1.0f, 0.0f},
         Vector4{Vector3{1.25f, 0.0f, 0.25f}.normalized(), -1.0f}, {},
         Vector3{0.25f, 0.0f, -1.25f}.normalized()},
        {{ 1.0f,  1.0f, 0.0f},
        Vector4{Vector3{-1.0f, 0.25f, 0.0f}.normalized(), -1.0f}, {},
         Vector3{-0.25f, -1.0f, 0.0f}.normalized()},
        {{-1.0f, -1.0f, 0.0f},
        {1.0f, 0.0f, 0.0f, -1.0f}, {},
         {0.0f, 0.0f, 1.0f}},
        {{-1.0f,  1.0f, 0.0f},
         Vector4{Vector3{0.75f, 0.0f, -0.25f}.normalized(), 1.0f}, {},
         Vector3{0.25f, 0.0f, 0.75f}.normalized()}
    };

    /* Calculate bitangents from normal+tangent */
    for(Vertex& i: vertexData)
        i.bitangent = Math::cross(i.normal, i.tangent.xyz())*i.tangent.w();

    /* Verify the TBN is orthogonal */
    for(Vertex& i: vertexData) {
        CORRADE_ITERATION(i.position);
        CORRADE_VERIFY(i.tangent.xyz().isNormalized());
        CORRADE_VERIFY(i.bitangent.isNormalized());
        CORRADE_VERIFY(i.normal.isNormalized());
        CORRADE_COMPARE(dot(i.normal, i.tangent.xyz()), 0.0f);
        CORRADE_COMPARE(dot(i.normal, i.bitangent), 0.0f);
        CORRADE_COMPARE(dot(i.tangent.xyz(), i.bitangent), 0.0f);
    }

    /* Apply scale to all */
    for(Vertex& i: vertexData) {
        i.tangent *= data.multiply;
        i.bitangent *= data.multiply;
        i.normal *= data.multiply;
    }

    GL::Buffer vertices{vertexData};
    GL::Mesh mesh{MeshPrimitive::TriangleStrip};
    mesh.setCount(4)
        .addVertexBuffer(vertices, 0,
            Shaders::MeshVisualizerGL3D::Position{},
            sizeof(Vector4), /* conditionally added below */
            sizeof(Vector3), /* conditionally added below */
            Shaders::MeshVisualizerGL3D::Normal{});
    if(data.flags & MeshVisualizerGL3D::Flag::BitangentFromTangentDirection && !data.skipBitagnentEvenIfEnabledInFlags)
        mesh.addVertexBuffer(vertices, 0,
            sizeof(Vector3),
            Shaders::MeshVisualizerGL3D::Tangent4{},
            sizeof(Vector3),
            sizeof(Vector3));
    else if(data.flags & MeshVisualizerGL3D::Flag::TangentDirection)
        mesh.addVertexBuffer(vertices, 0,
            sizeof(Vector3),
            Shaders::MeshVisualizerGL3D::Tangent{}, sizeof(Float), sizeof(Vector3),
            sizeof(Vector3));
    if(data.flags & MeshVisualizerGL3D::Flag::BitangentDirection && !data.skipBitagnentEvenIfEnabledInFlags)
        mesh.addVertexBuffer(vertices, 0,
            sizeof(Vector3),
            sizeof(Vector4),
            Shaders::MeshVisualizerGL3D::Bitangent{},
            sizeof(Vector3));

    Matrix4 transformation = Matrix4::translation({0.0f, 0.5f, -3.5f})*
        Matrix4::rotationX(-60.0_degf)*
        Matrix4::scaling(Vector3::yScale(1.5f));

    if(data.secondPassFlags) {
        MeshVisualizerGL3D{data.secondPassFlags}
            /** @todo make this unnecessary */
            .setViewportSize({80, 80})
            .setTransformationMatrix(transformation)
            .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
            .setColor(0xffff99_rgbf)
            .setWireframeColor(0x9999ff_rgbf)
            .draw(mesh);
    }

    MeshVisualizerGL3D shader{data.flags|flag};
    /** @todo make this unnecessary */
    shader.setViewportSize({80, 80});
    if(data.flags & MeshVisualizerGL3D::Flag::PrimitiveId)
        shader.bindColorMapTexture(_colorMapTexture);

    if(flag == MeshVisualizerGL3D::Flag{}) {
        shader.setTransformationMatrix(transformation)
            .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
            .setNormalMatrix(transformation.normalMatrix()*data.multiply)
            .setSmoothness(data.smoothness)
            .setLineLength(data.lineLength)
            .setLineWidth(data.lineWidth);
        if(data.flags & MeshVisualizerGL3D::Flag::Wireframe)
            shader
                .setColor(0xffff99_rgbf)
                .setWireframeColor(0x9999ff_rgbf);
        if(data.flags & MeshVisualizerGL3D::Flag::PrimitiveId)
            shader.setColorMapTransformation(1.0f/512.0f, 0.5f);
        shader.draw(mesh);
    } else if(flag == MeshVisualizerGL3D::Flag::UniformBuffers) {
        GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
            ProjectionUniform3D{}
                .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
        }};
        GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, {
            TransformationUniform3D{}
                .setTransformationMatrix(transformation)
        }};
        GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, {
            MeshVisualizerDrawUniform3D{}
                .setNormalMatrix(transformation.normalMatrix()*data.multiply)
        }};
        MeshVisualizerMaterialUniform materialUniformData[1];
        (*materialUniformData)
            .setSmoothness(data.smoothness)
            .setLineLength(data.lineLength)
            .setLineWidth(data.lineWidth);
        if(data.flags & MeshVisualizerGL3D::Flag::Wireframe)
            (*materialUniformData)
                .setColor(0xffff99_rgbf)
                .setWireframeColor(0x9999ff_rgbf);
        if(data.flags & MeshVisualizerGL3D::Flag::PrimitiveId)
            materialUniformData->setColorMapTransformation(1.0f/512.0f, 0.5f);
        GL::Buffer materialUniform{materialUniformData};
        shader
            .bindProjectionBuffer(projectionUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform)
            .bindMaterialBuffer(materialUniform)
            .draw(mesh);
    } else CORRADE_INTERNAL_ASSERT_UNREACHABLE();

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /* Slight rasterization differences on AMD. If
       GL_NV_shader_noperspective_interpolation is not supported, the artifacts
       are bigger. */
    Float maxThreshold = 1.334f, meanThreshold = 0.018f;
    #ifdef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::NV::shader_noperspective_interpolation>()) {
        maxThreshold = 58.0f;
        meanThreshold = 1.547f;
    }
    #endif
    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.file}),
        (DebugTools::CompareImageToFile{_manager, maxThreshold, meanThreshold}));
}
#endif

#ifndef MAGNUM_TARGET_GLES2
void MeshVisualizerGLTest::renderMulti2D() {
    auto&& data = RenderMultiData2D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if((data.flags & MeshVisualizerGL2D::Flag::Wireframe) && !(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader)) {
        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
            CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
        #else
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
            CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
        #endif
    }
    #endif

    /* Circle is a fan, plane is a strip, make it indexed first */
    Trade::MeshData circleData = MeshTools::generateIndices(Primitives::circle2DSolid(8));
    Trade::MeshData squareData = MeshTools::generateIndices(Primitives::squareSolid());
    Trade::MeshData triangleData = MeshTools::generateIndices(Primitives::circle2DSolid(3));
    /* For a GS-less wireframe we have to deindex the meshes */
    if(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader)
        for(Trade::MeshData* i: {&circleData, &squareData, &triangleData})
            *i = MeshTools::duplicate(*i);
    GL::Mesh mesh = MeshTools::compile(MeshTools::concatenate({circleData, squareData, triangleData}));
    GL::MeshView circle{mesh};
    circle.setCount(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader ?
        circleData.vertexCount() : circleData.indexCount());
    GL::MeshView square{mesh};
    square.setCount(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader ?
        squareData.vertexCount() : squareData.indexCount());
    if(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader)
        square.setBaseVertex(circleData.vertexCount());
    else
        square.setIndexRange(circleData.indexCount());
    GL::MeshView triangle{mesh};
    triangle.setCount(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader ?
        triangleData.vertexCount() : triangleData.indexCount());
    if(data.flags & MeshVisualizerGL2D::Flag::NoGeometryShader)
        triangle.setBaseVertex(circleData.vertexCount() + squareData.vertexCount());
    else triangle.setIndexRange(circleData.indexCount() + squareData.indexCount());

    /* Some drivers have uniform offset alignment as high as 256, which means
       the subsequent sets of uniforms have to be aligned to a multiply of it.
       The data.uniformIncrement is set high enough to ensure that, in the
       non-offset-bind case this value is 1. */

    Containers::Array<MeshVisualizerMaterialUniform> materialData{data.uniformIncrement + 1};
    materialData[0*data.uniformIncrement] = MeshVisualizerMaterialUniform{}
        .setColor(0xffffcc_rgbf)
        .setWireframeColor(0xcc0000_rgbf)
        .setColorMapTransformation(0.5f/circleData.vertexCount(), 1.0f/circleData.vertexCount());
    materialData[1*data.uniformIncrement] = MeshVisualizerMaterialUniform{}
        .setColor(0xccffff_rgbf)
        .setWireframeColor(0x0000cc_rgbf)
        .setWireframeWidth(2.5f)
        .setColorMapTransformation(0.5f/triangleData.vertexCount(), 1.0f/triangleData.vertexCount());
    GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, materialData};

    Containers::Array<TransformationProjectionUniform2D> transformationProjectionData{2*data.uniformIncrement + 1};
    transformationProjectionData[0*data.uniformIncrement] = TransformationProjectionUniform2D{}
        .setTransformationProjectionMatrix(
            Matrix3::projection({2.1f, 2.1f})*
            Matrix3::scaling(Vector2{0.4f})*
            Matrix3::translation({-1.25f, -1.25f})
        );
    transformationProjectionData[1*data.uniformIncrement] = TransformationProjectionUniform2D{}
        .setTransformationProjectionMatrix(
            Matrix3::projection({2.1f, 2.1f})*
            Matrix3::scaling(Vector2{0.4f})*
            Matrix3::translation({ 1.25f, -1.25f})
        );
    transformationProjectionData[2*data.uniformIncrement] = TransformationProjectionUniform2D{}
        .setTransformationProjectionMatrix(
            Matrix3::projection({2.1f, 2.1f})*
            Matrix3::scaling(Vector2{0.4f})*
            Matrix3::translation({ 0.00f,  1.25f})
        );
    GL::Buffer transformationProjectionUniform{GL::Buffer::TargetHint::Uniform, transformationProjectionData};

    Containers::Array<MeshVisualizerDrawUniform2D> drawData{2*data.uniformIncrement + 1};
    /* Material offsets are zero if we have single draw, as those are done with
       UBO offset bindings instead. */
    drawData[0*data.uniformIncrement] = MeshVisualizerDrawUniform2D{}
        .setMaterialId(data.drawCount == 1 ? 0 : 0);
    drawData[1*data.uniformIncrement] = MeshVisualizerDrawUniform2D{}
        .setMaterialId(data.drawCount == 1 ? 0 : 1);
    drawData[2*data.uniformIncrement] = MeshVisualizerDrawUniform2D{}
        .setMaterialId(data.drawCount == 1 ? 0 : 1);
    GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, drawData};

    MeshVisualizerGL2D shader{MeshVisualizerGL2D::Flag::UniformBuffers|data.flags, data.materialCount, data.drawCount};
    shader.setViewportSize(Vector2{RenderSize});
    if(data.flags & MeshVisualizerGL2D::Flag::VertexId)
        shader.bindColorMapTexture(_colorMapTexture);

    /* Just one draw, rebinding UBOs each time */
    if(data.drawCount == 1) {
        shader.bindMaterialBuffer(materialUniform,
            0*data.uniformIncrement*sizeof(MeshVisualizerMaterialUniform),
            sizeof(MeshVisualizerMaterialUniform));
        shader.bindTransformationProjectionBuffer(transformationProjectionUniform,
            0*data.uniformIncrement*sizeof(TransformationProjectionUniform2D),
            sizeof(TransformationProjectionUniform2D));
        shader.bindDrawBuffer(drawUniform,
            0*data.uniformIncrement*sizeof(MeshVisualizerDrawUniform2D),
            sizeof(MeshVisualizerDrawUniform2D));
        shader.draw(circle);

        shader.bindMaterialBuffer(materialUniform,
            1*data.uniformIncrement*sizeof(MeshVisualizerMaterialUniform),
            sizeof(MeshVisualizerMaterialUniform));
        shader.bindTransformationProjectionBuffer(transformationProjectionUniform,
            1*data.uniformIncrement*sizeof(TransformationProjectionUniform2D),
            sizeof(TransformationProjectionUniform2D));
        shader.bindDrawBuffer(drawUniform,
            1*data.uniformIncrement*sizeof(MeshVisualizerDrawUniform2D),
            sizeof(MeshVisualizerDrawUniform2D));
        shader.draw(square);

        shader.bindMaterialBuffer(materialUniform,
            1*data.uniformIncrement*sizeof(MeshVisualizerMaterialUniform),
            sizeof(MeshVisualizerMaterialUniform));
        shader.bindTransformationProjectionBuffer(transformationProjectionUniform,
            2*data.uniformIncrement*sizeof(TransformationProjectionUniform2D),
            sizeof(TransformationProjectionUniform2D));
        shader.bindDrawBuffer(drawUniform,
            2*data.uniformIncrement*sizeof(MeshVisualizerDrawUniform2D),
            sizeof(MeshVisualizerDrawUniform2D));
        shader.draw(triangle);

    /* Otherwise using the draw offset */
    } else {
        shader.bindMaterialBuffer(materialUniform)
            .bindTransformationProjectionBuffer(transformationProjectionUniform)
            .bindDrawBuffer(drawUniform);
        shader.setDrawOffset(0)
            .draw(circle);
        shader.setDrawOffset(1)
            .draw(square);
        shader.setDrawOffset(2)
            .draw(triangle);
    };

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /*
        Wireframe case:

        -   Circle should be lower left, pink with red wireframe
        -   Square lower right, cyan with thick blue wireframe
        -   Triangle up center, cyan with thick blue wireframe

        Vertex ID case:

        -   Circle and triangle should have both almost the full color map
            range, one tinted pink, one cyan
        -   Square tinted cyan, with just two colors
    */
    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.expected}),
        (DebugTools::CompareImageToFile{_manager, data.maxThreshold, data.meanThreshold}));
}

void MeshVisualizerGLTest::renderMulti3D() {
    auto&& data = RenderMultiData3D[testCaseInstanceId()];
    setTestCaseDescription(data.name);

    #ifndef MAGNUM_TARGET_GLES
    if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::uniform_buffer_object>())
        CORRADE_SKIP(GL::Extensions::ARB::uniform_buffer_object::string() << "is not supported.");
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    if(((data.flags & MeshVisualizerGL3D::Flag::Wireframe) && !(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader)) || (data.flags & (MeshVisualizerGL3D::Flag::TangentDirection|MeshVisualizerGL3D::Flag::BitangentDirection|MeshVisualizerGL3D::Flag::BitangentFromTangentDirection|MeshVisualizerGL3D::Flag::NormalDirection))) {
        #ifndef MAGNUM_TARGET_GLES
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::ARB::geometry_shader4>())
            CORRADE_SKIP(GL::Extensions::ARB::geometry_shader4::string() << "is not supported.");
        #else
        if(!GL::Context::current().isExtensionSupported<GL::Extensions::EXT::geometry_shader>())
            CORRADE_SKIP(GL::Extensions::EXT::geometry_shader::string() << "is not supported.");
        #endif
    }
    #endif

    Trade::MeshData sphereData = MeshTools::interleave(Primitives::icosphereSolid(0), {
        /* The icosphere doesn't have tangents and we don't use them, but
           concatenate() will ignore the tangents of others if the first mesh
           doesn't have them, so add a bogus data at least */
        Trade::MeshAttributeData{Trade::MeshAttribute::Tangent, VertexFormat::Vector4, nullptr}
    });
    /* Plane is a strip, make it indexed first */
    Trade::MeshData planeData = MeshTools::generateIndices(Primitives::planeSolid(Primitives::PlaneFlag::Tangents));
    Trade::MeshData coneData = Primitives::coneSolid(1, 8, 1.0f, Primitives::ConeFlag::Tangents);
    /* For a GS-less wireframe we have to deindex the meshes */
    if(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader)
        for(Trade::MeshData* i: {&sphereData, &planeData, &coneData})
            *i = MeshTools::duplicate(*i);
    GL::Mesh mesh = MeshTools::compile(MeshTools::concatenate({sphereData, planeData, coneData}));
    GL::MeshView sphere{mesh};
    sphere.setCount(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader ?
        sphereData.vertexCount() : sphereData.indexCount());
    GL::MeshView plane{mesh};
    plane.setCount(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader ?
        planeData.vertexCount() : planeData.indexCount());
    if(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader)
        plane.setBaseVertex(sphereData.vertexCount());
    else
        plane.setIndexRange(sphereData.indexCount());
    GL::MeshView cone{mesh};
    cone.setCount(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader ?
        coneData.vertexCount() : coneData.indexCount());
    if(data.flags & MeshVisualizerGL3D::Flag::NoGeometryShader)
        cone.setBaseVertex(sphereData.vertexCount() + planeData.vertexCount());
    else cone.setIndexRange(sphereData.indexCount() + planeData.indexCount());

    GL::Buffer projectionUniform{GL::Buffer::TargetHint::Uniform, {
        ProjectionUniform3D{}.setProjectionMatrix(
            Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f)
        )
    }};

    /* Some drivers have uniform offset alignment as high as 256, which means
       the subsequent sets of uniforms have to be aligned to a multiply of it.
       The data.uniformIncrement is set high enough to ensure that, in the
       non-offset-bind case this value is 1. */

    Containers::Array<MeshVisualizerMaterialUniform> materialData{data.uniformIncrement + 1};
    materialData[0*data.uniformIncrement] = MeshVisualizerMaterialUniform{}
        .setColor(0xffffcc_rgbf)
        .setWireframeColor(0xcc0000_rgbf)
        .setLineLength(0.0f) /* no TBN */
        .setColorMapTransformation(0.5f/sphereData.vertexCount(), 1.0f/sphereData.vertexCount());
    materialData[1*data.uniformIncrement] = MeshVisualizerMaterialUniform{}
        .setColor(0xccffff_rgbf)
        .setWireframeColor(0x0000cc_rgbf)
        .setLineLength(0.25f)
        .setWireframeWidth(2.5f)
        .setColorMapTransformation(0.5f/coneData.vertexCount(), 1.0f/coneData.vertexCount());
    GL::Buffer materialUniform{GL::Buffer::TargetHint::Uniform, materialData};

    Containers::Array<TransformationUniform3D> transformationData{2*data.uniformIncrement + 1};
    transformationData[0*data.uniformIncrement] = TransformationUniform3D{}
        .setTransformationMatrix(
            Matrix4::translation(Vector3::zAxis(-2.15f))*
            Matrix4::scaling(Vector3{0.4f})*
            Matrix4::translation({-1.25f, -1.25f, 0.0f})
        );
    transformationData[1*data.uniformIncrement] = TransformationUniform3D{}
        .setTransformationMatrix(
            Matrix4::translation(Vector3::zAxis(-2.15f))*
            Matrix4::scaling(Vector3{0.4f})*
            Matrix4::translation({ 1.25f, -1.25f, 0.0f})
        );
    transformationData[2*data.uniformIncrement] = TransformationUniform3D{}
        .setTransformationMatrix(
            Matrix4::translation(Vector3::zAxis(-2.15f))*
            Matrix4::scaling(Vector3{0.4f})*
            Matrix4::translation({  0.0f,  1.0f, 1.0f})
        );
    GL::Buffer transformationUniform{GL::Buffer::TargetHint::Uniform, transformationData};

    Containers::Array<MeshVisualizerDrawUniform3D> drawData{2*data.uniformIncrement + 1};
    /* Material offsets are zero if we have single draw, as those are done with
       UBO offset bindings instead. Also no need to supply a normal matrix. */
    drawData[0*data.uniformIncrement] = MeshVisualizerDrawUniform3D{}
        .setMaterialId(data.drawCount == 1 ? 0 : 0);
    drawData[1*data.uniformIncrement] = MeshVisualizerDrawUniform3D{}
        .setMaterialId(data.drawCount == 1 ? 0 : 1);
    drawData[2*data.uniformIncrement] = MeshVisualizerDrawUniform3D{}
        .setMaterialId(data.drawCount == 1 ? 0 : 1);
    GL::Buffer drawUniform{GL::Buffer::TargetHint::Uniform, drawData};

    MeshVisualizerGL3D shader{MeshVisualizerGL3D::Flag::UniformBuffers|data.flags, data.materialCount, data.drawCount};
    shader.setViewportSize(Vector2{RenderSize})
        .bindProjectionBuffer(projectionUniform);
    if(data.flags & MeshVisualizerGL3D::Flag::VertexId)
        shader.bindColorMapTexture(_colorMapTexture);

    /* Just one draw, rebinding UBOs each time */
    if(data.drawCount == 1) {
        shader.bindMaterialBuffer(materialUniform,
            0*data.uniformIncrement*sizeof(MeshVisualizerMaterialUniform),
            sizeof(MeshVisualizerMaterialUniform));
        shader.bindTransformationBuffer(transformationUniform,
            0*data.uniformIncrement*sizeof(TransformationUniform3D),
            sizeof(TransformationUniform3D));
        shader.bindDrawBuffer(drawUniform,
            0*data.uniformIncrement*sizeof(MeshVisualizerDrawUniform3D),
            sizeof(MeshVisualizerDrawUniform3D));
        shader.draw(sphere);

        shader.bindMaterialBuffer(materialUniform,
            1*data.uniformIncrement*sizeof(MeshVisualizerMaterialUniform),
            sizeof(MeshVisualizerMaterialUniform));
        shader.bindTransformationBuffer(transformationUniform,
            1*data.uniformIncrement*sizeof(TransformationUniform3D),
            sizeof(TransformationUniform3D));
        shader.bindDrawBuffer(drawUniform,
            1*data.uniformIncrement*sizeof(MeshVisualizerDrawUniform3D),
            sizeof(MeshVisualizerDrawUniform3D));
        shader.draw(plane);

        shader.bindMaterialBuffer(materialUniform,
            1*data.uniformIncrement*sizeof(MeshVisualizerMaterialUniform),
            sizeof(MeshVisualizerMaterialUniform));
        shader.bindTransformationBuffer(transformationUniform,
            2*data.uniformIncrement*sizeof(TransformationUniform3D),
            sizeof(TransformationUniform3D));
        shader.bindDrawBuffer(drawUniform,
            2*data.uniformIncrement*sizeof(MeshVisualizerDrawUniform3D),
            sizeof(MeshVisualizerDrawUniform3D));
        shader.draw(cone);

    /* Otherwise using the draw offset */
    } else {
        shader.bindMaterialBuffer(materialUniform)
            .bindTransformationBuffer(transformationUniform)
            .bindDrawBuffer(drawUniform);
        shader.setDrawOffset(0)
            .draw(sphere);
        shader.setDrawOffset(1)
            .draw(plane);
        shader.setDrawOffset(2)
            .draw(cone);
    };

    MAGNUM_VERIFY_NO_GL_ERROR();

    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
        CORRADE_SKIP("AnyImageImporter / TgaImporter plugins not found.");

    /*
        Wireframe case:

        -   Sphere should be lower left, pink with red wireframe (and no TBN)
        -   Plane lower right, cyan with thick blue wireframe and TBN
        -   Cone up center, cyan with thick blue wireframe and TBN

        Vertex ID case:

        -   Sphere and cone should have both almost the full color map
            range, one tinted pink, one cyan
        -   Plane tinted cyan, with just two colors
    */
    CORRADE_COMPARE_WITH(
        /* Dropping the alpha channel, as it's always 1.0 */
        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
        Utility::Directory::join({_testDir, "MeshVisualizerTestFiles", data.expected}),
        (DebugTools::CompareImageToFile{_manager, data.maxThreshold, data.meanThreshold}));
}
#endif

}}}}

CORRADE_TEST_MAIN(Magnum::Shaders::Test::MeshVisualizerGLTest)