/*
    This file is part of Magnum.

    Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019,
                2020, 2021, 2022 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 <sstream>
#include <Corrade/TestSuite/Compare/Container.h>
#include <Corrade/Utility/DebugStl.h>

#include "Magnum/Image.h"
#include "Magnum/ImageView.h"
#include "Magnum/GL/Context.h"
#include "Magnum/GL/CubeMapTexture.h"
#include "Magnum/GL/Extensions.h"
#include "Magnum/GL/Framebuffer.h"
#include "Magnum/GL/OpenGLTester.h"
#include "Magnum/GL/PixelFormat.h"
#include "Magnum/GL/Renderbuffer.h"
#include "Magnum/GL/RenderbufferFormat.h"
#include "Magnum/GL/Texture.h"
#include "Magnum/GL/TextureFormat.h"
#include "Magnum/Math/Color.h"

#ifndef MAGNUM_TARGET_WEBGL
#include <Corrade/Containers/String.h>
#endif

#ifndef MAGNUM_TARGET_GLES2
#include "Magnum/GL/BufferImage.h"
#include "Magnum/GL/TextureArray.h"
#endif
#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
#include "Magnum/GL/MultisampleTexture.h"
#include "Magnum/GL/CubeMapTextureArray.h"
#endif
#ifndef MAGNUM_TARGET_GLES
#include "Magnum/GL/RectangleTexture.h"
#endif

namespace Magnum { namespace GL { namespace Test { namespace {

struct FramebufferGLTest: OpenGLTester {
    explicit FramebufferGLTest();

    void construct();
    void constructMove();
    void wrap();

    #ifndef MAGNUM_TARGET_WEBGL
    void label();
    #endif

    void attachRenderbuffer();
    #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
    void attachRenderbufferMultisample();
    #endif

    #ifndef MAGNUM_TARGET_GLES
    void attachTexture1D();
    #endif
    void attachTexture2D();
    #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
    void attachTexture3D();
    #endif
    #ifndef MAGNUM_TARGET_GLES
    void attachTexture1DArray();
    #endif
    #ifndef MAGNUM_TARGET_GLES2
    void attachTexture2DArray();
    #endif
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    void attachTexture2DMultisample();
    void attachTexture2DMultisampleArray();
    #endif
    #ifndef MAGNUM_TARGET_GLES
    void attachRectangleTexture();
    #endif
    void attachCubeMapTexture();
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    void attachCubeMapTextureArray();
    #endif
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    void attachLayeredTexture3D();
    #ifndef MAGNUM_TARGET_GLES
    void attachLayeredTexture1DArray();
    #endif
    void attachLayeredTexture2DArray();
    void attachLayeredCubeMapTexture();
    void attachLayeredCubeMapTextureArray();
    void attachLayeredTexture2DMultisampleArray();
    #endif
    void detach();

    void multipleColorOutputs();

    void clear();
    #ifndef MAGNUM_TARGET_GLES2
    void clearColorI();
    void clearColorUI();
    void clearColorF();
    void clearDepth();
    void clearStencil();
    void clearDepthStencil();
    #endif
    #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
    void invalidate();
    #endif
    #ifndef MAGNUM_TARGET_GLES2
    void invalidateCombinedDepthStencil();
    #endif
    #ifndef MAGNUM_TARGET_GLES2
    void invalidateSub();
    #endif
    void read();
    void readView();
    void readViewNullptr();
    void readViewBadSize();
    #ifndef MAGNUM_TARGET_GLES2
    void readBuffer();
    #endif
    #ifndef MAGNUM_TARGET_GLES
    void copyImageTexture1D();
    #endif
    void copyImageTexture2D();
    #ifndef MAGNUM_TARGET_GLES
    void copyImageTexture1DArray();
    #endif
    #ifndef MAGNUM_TARGET_GLES
    void copyImageRectangleTexture();
    #endif
    void copyImageCubeMapTexture();
    #ifndef MAGNUM_TARGET_GLES
    void copySubImageTexture1D();
    #endif
    void copySubImageTexture2D();
    #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
    void copySubImageTexture3D();
    #endif
    #ifndef MAGNUM_TARGET_GLES
    void copySubImageTexture1DArray();
    #endif
    #ifndef MAGNUM_TARGET_GLES2
    void copySubImageTexture2DArray();
    #endif
    #ifndef MAGNUM_TARGET_GLES
    void copySubImageRectangleTexture();
    #endif
    void copySubImageCubeMapTexture();
    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    void copySubImageCubeMapTextureArray();
    #endif
    #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
    void blit();
    #endif

    void implementationColorReadFormat();

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    private:
        TextureFormat rgbaFormatES2, depthStencilFormatES2;
    #endif
};

constexpr struct {
    const char* name;
    RenderbufferFormat renderbufferFormat;
    PixelFormat expectedFormat;
    PixelType expectedType;
    bool integer;
} ImplementationColorReadFormatData[]{
    {"classic",
        #if !defined(MAGNUM_TARGET_GLES2) || !defined(MAGNUM_TARGET_WEBGL)
        RenderbufferFormat::RGBA8,
        #else
        RenderbufferFormat::RGBA4,
        #endif
        PixelFormat::RGBA,
        #if !defined(MAGNUM_TARGET_GLES2) || !defined(MAGNUM_TARGET_WEBGL)
        PixelType::UnsignedByte,
        #else
        GL::PixelType::UnsignedShort4444,
        #endif
        false},
    #ifndef MAGNUM_TARGET_GLES2
    {"integer", RenderbufferFormat::RG32UI, PixelFormat::RGInteger, PixelType::UnsignedInt, true},
    {"float", RenderbufferFormat::RGBA16F, PixelFormat::RGBA, PixelType::Half, false}
    #endif
};

FramebufferGLTest::FramebufferGLTest() {
    addTests({&FramebufferGLTest::construct,
              &FramebufferGLTest::constructMove,
              &FramebufferGLTest::wrap,

              #ifndef MAGNUM_TARGET_WEBGL
              &FramebufferGLTest::label,
              #endif

              &FramebufferGLTest::attachRenderbuffer,
              #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
              &FramebufferGLTest::attachRenderbufferMultisample,
              #endif

              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::attachTexture1D,
              #endif
              &FramebufferGLTest::attachTexture2D,
              #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
              &FramebufferGLTest::attachTexture3D,
              #endif
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::attachTexture1DArray,
              #endif
              #ifndef MAGNUM_TARGET_GLES2
              &FramebufferGLTest::attachTexture2DArray,
              #endif
              #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
              &FramebufferGLTest::attachTexture2DMultisample,
              &FramebufferGLTest::attachTexture2DMultisampleArray,
              #endif
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::attachRectangleTexture,
              #endif
              &FramebufferGLTest::attachCubeMapTexture,
              #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
              &FramebufferGLTest::attachCubeMapTextureArray,
              #endif
              #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
              &FramebufferGLTest::attachLayeredTexture3D,
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::attachLayeredTexture1DArray,
              #endif
              &FramebufferGLTest::attachLayeredTexture2DArray,
              &FramebufferGLTest::attachLayeredCubeMapTexture,
              &FramebufferGLTest::attachLayeredCubeMapTextureArray,
              &FramebufferGLTest::attachLayeredTexture2DMultisampleArray,
              #endif
              &FramebufferGLTest::detach,

              &FramebufferGLTest::multipleColorOutputs,

              &FramebufferGLTest::clear,
              #ifndef MAGNUM_TARGET_GLES2
              &FramebufferGLTest::clearColorI,
              &FramebufferGLTest::clearColorUI,
              &FramebufferGLTest::clearColorF,
              &FramebufferGLTest::clearDepth,
              &FramebufferGLTest::clearStencil,
              &FramebufferGLTest::clearDepthStencil,
              #endif
              #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
              &FramebufferGLTest::invalidate,
              #endif
              #ifndef MAGNUM_TARGET_GLES2
              &FramebufferGLTest::invalidateCombinedDepthStencil,
              #endif
              #ifndef MAGNUM_TARGET_GLES2
              &FramebufferGLTest::invalidateSub,
              #endif
              &FramebufferGLTest::read,
              &FramebufferGLTest::readView,
              &FramebufferGLTest::readViewNullptr,
              &FramebufferGLTest::readViewBadSize,
              #ifndef MAGNUM_TARGET_GLES2
              &FramebufferGLTest::readBuffer,
              #endif
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::copyImageTexture1D,
              #endif
              &FramebufferGLTest::copyImageTexture2D,
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::copyImageTexture1DArray,
              #endif
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::copyImageRectangleTexture,
              #endif
              &FramebufferGLTest::copyImageCubeMapTexture,
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::copySubImageTexture1D,
              #endif
              &FramebufferGLTest::copySubImageTexture2D,
              #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
              &FramebufferGLTest::copySubImageTexture3D,
              #endif
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::copySubImageTexture1DArray,
              #endif
              #ifndef MAGNUM_TARGET_GLES2
              &FramebufferGLTest::copySubImageTexture2DArray,
              #endif
              #ifndef MAGNUM_TARGET_GLES
              &FramebufferGLTest::copySubImageRectangleTexture,
              #endif
              &FramebufferGLTest::copySubImageCubeMapTexture,
              #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
              &FramebufferGLTest::copySubImageCubeMapTextureArray,
              #endif
              #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
              &FramebufferGLTest::blit
              #endif
              });

    addInstancedTests({&FramebufferGLTest::implementationColorReadFormat}, Containers::arraySize(ImplementationColorReadFormatData));

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::EXT::texture_storage>()) {
        rgbaFormatES2 = TextureFormat::RGBA8;
        depthStencilFormatES2 = TextureFormat::Depth24Stencil8;
    } else {
        rgbaFormatES2 = TextureFormat::RGBA;
        depthStencilFormatES2 = TextureFormat::DepthStencil;
    }
    #endif
}

#ifndef MAGNUM_TARGET_WEBGL
using namespace Containers::Literals;
#endif

void FramebufferGLTest::construct() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    {
        const Framebuffer framebuffer({{32, 16}, {128, 256}});

        MAGNUM_VERIFY_NO_GL_ERROR();
        CORRADE_VERIFY(framebuffer.id() > 0);
        CORRADE_COMPARE(framebuffer.viewport(), Range2Di({32, 16}, {128, 256}));
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
}

void FramebufferGLTest::constructMove() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Framebuffer a({{32, 16}, {128, 256}});
    const Int id = a.id();

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_VERIFY(id > 0);

    Framebuffer b(std::move(a));

    CORRADE_COMPARE(a.id(), 0);
    CORRADE_COMPARE(b.id(), id);
    CORRADE_COMPARE(b.viewport(), Range2Di({32, 16}, {128, 256}));

    Framebuffer c({{128, 256}, {32, 16}});
    const Int cId = c.id();
    c = std::move(b);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_VERIFY(cId > 0);
    CORRADE_COMPARE(b.id(), cId);
    CORRADE_COMPARE(c.id(), id);
    CORRADE_COMPARE(c.viewport(), Range2Di({32, 16}, {128, 256}));

    CORRADE_VERIFY(std::is_nothrow_move_constructible<Framebuffer>::value);
    CORRADE_VERIFY(std::is_nothrow_move_assignable<Framebuffer>::value);
}

void FramebufferGLTest::wrap() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    GLuint id;
    glGenFramebuffers(1, &id);

    /* Releasing won't delete anything */
    {
        auto framebuffer = Framebuffer::wrap(id, {}, ObjectFlag::DeleteOnDestruction);
        CORRADE_COMPARE(framebuffer.release(), id);
    }

    /* ...so we can wrap it again */
    Framebuffer::wrap(id, {});
    glDeleteFramebuffers(1, &id);
}

#ifndef MAGNUM_TARGET_WEBGL
void FramebufferGLTest::label() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    /* No-Op version is tested in AbstractObjectGLTest */
    if(!Context::current().isExtensionSupported<Extensions::KHR::debug>() &&
       !Context::current().isExtensionSupported<Extensions::EXT::debug_label>())
        CORRADE_SKIP("Required extension is not supported");

    Framebuffer framebuffer({{}, Vector2i(32)});
    CORRADE_COMPARE(framebuffer.label(), "");
    MAGNUM_VERIFY_NO_GL_ERROR();

    /* Test the string size gets correctly used, instead of relying on null
       termination */
    framebuffer.setLabel("MyFramebuffer!"_s.exceptSuffix(1));
    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE(framebuffer.label(), "MyFramebuffer");
    MAGNUM_VERIFY_NO_GL_ERROR();
}
#endif

void FramebufferGLTest::attachRenderbuffer() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    /* Separate depth and stencil renderbuffers are not supported (or at least
       on my NVidia, thus we need to do this juggling with one renderbuffer */
    Renderbuffer depthStencil;
    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
        Debug() << "Using" << Extensions::OES::packed_depth_stencil::string();
        #endif
        depthStencil.setStorage(
            #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
            RenderbufferFormat::Depth24Stencil8,
            #else
            RenderbufferFormat::DepthStencil,
            #endif
            Vector2i(128));
    }
    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    else depthStencil.setStorage(RenderbufferFormat::DepthComponent16, Vector2i(128));
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::Depth, depthStencil);

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        framebuffer.attachRenderbuffer(Framebuffer::BufferAttachment::Stencil, depthStencil);
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

#if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
void FramebufferGLTest::attachRenderbufferMultisample() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #elif defined(MAGNUM_TARGET_GLES2)
    if(!Context::current().isExtensionSupported<Extensions::ANGLE::framebuffer_multisample>() &&
       !Context::current().isExtensionSupported<Extensions::NV::framebuffer_multisample>())
        CORRADE_SKIP("Neither" << Extensions::ANGLE::framebuffer_multisample::string() << "nor" << Extensions::NV::framebuffer_multisample::string() << "is supported.");
    #endif

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorageMultisample(Renderbuffer::maxSamples(), RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorageMultisample(Renderbuffer::maxSamples(), RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    MAGNUM_ASSERT_GL_EXTENSION_SUPPORTED(Extensions::OES::packed_depth_stencil);
    #endif

    Renderbuffer depthStencil;
    depthStencil.setStorageMultisample(Renderbuffer::maxSamples(), RenderbufferFormat::Depth24Stencil8, Vector2i(128));

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color)
               #ifndef MAGNUM_TARGET_GLES2
               .attachRenderbuffer(Framebuffer::BufferAttachment::DepthStencil, depthStencil);
               #else
               .attachRenderbuffer(Framebuffer::BufferAttachment::Depth, depthStencil)
               .attachRenderbuffer(Framebuffer::BufferAttachment::Stencil, depthStencil);
               #endif

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::attachTexture1D() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");

    Texture1D color;
    color.setStorage(1, TextureFormat::RGBA8, 128);

    Texture1D depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, 128);

    Framebuffer framebuffer({{}, {128, 1}});
    framebuffer.attachTexture(Framebuffer::ColorAttachment(0), color, 0)
               .attachTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

void FramebufferGLTest::attachTexture2D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    MAGNUM_VERIFY_NO_GL_ERROR();

    Framebuffer framebuffer({{}, Vector2i(128)});

    MAGNUM_VERIFY_NO_GL_ERROR();

    Texture2D color;
    color.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i(128));

    MAGNUM_VERIFY_NO_GL_ERROR();

    framebuffer.attachTexture(Framebuffer::ColorAttachment(0), color, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
        Debug() << "Using" << Extensions::OES::packed_depth_stencil::string();
        #endif

        /** @todo Is there any better way to select proper sized/unsized format on ES2? */
        Texture2D depthStencil;
        #if !defined(MAGNUM_TARGET_GLES2) || defined(MAGNUM_TARGET_WEBGL)
        depthStencil.setStorage(1,
            #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
            TextureFormat::Depth24Stencil8,
            #else
            TextureFormat::DepthStencil,
            #endif
            Vector2i(128));
        framebuffer.attachTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0);
        #else
        depthStencil.setStorage(1, depthStencilFormatES2, Vector2i(128));
        framebuffer.attachTexture(Framebuffer::BufferAttachment::Depth, depthStencil, 0)
                   .attachTexture(Framebuffer::BufferAttachment::Stencil, depthStencil, 0);
        #endif
    }

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    else if(Context::current().isExtensionSupported<Extensions::OES::depth_texture>()) {
        Debug() << "Using" << Extensions::OES::depth_texture::string();

        Texture2D depth;
        depth.setStorage(1, TextureFormat::DepthComponent16, Vector2i(128));
        framebuffer.attachTexture(Framebuffer::BufferAttachment::Depth, depth, 0);
    }
    #endif

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

#if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
void FramebufferGLTest::attachTexture3D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #elif defined(MAGNUM_TARGET_GLES2)
    if(!Context::current().isExtensionSupported<Extensions::OES::texture_3D>())
        CORRADE_SKIP(Extensions::OES::texture_3D::string() << "is not supported.");
    #endif

    Texture3D color;
    color.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #else
        rgbaFormatES2,
        #endif
        Vector3i(128));

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachTextureLayer(Framebuffer::ColorAttachment(0), color, 0, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::attachTexture1DArray() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::EXT::texture_array>())
        CORRADE_SKIP(Extensions::EXT::texture_array::string() << "is not supported.");

    Texture1DArray color;
    color.setStorage(1, TextureFormat::RGBA8, {128, 8});

    Texture1DArray depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, {128, 8});

    Framebuffer framebuffer({{}, {128, 1}});
    framebuffer.attachTextureLayer(Framebuffer::ColorAttachment(0), color, 0, 3)
               .attachTextureLayer(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0, 3);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

#ifndef MAGNUM_TARGET_GLES2
void FramebufferGLTest::attachTexture2DArray() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::EXT::texture_array>())
        CORRADE_SKIP(Extensions::EXT::texture_array::string() << "is not supported.");
    #endif

    Texture2DArray color;
    color.setStorage(1, TextureFormat::RGBA8, {128, 128, 8});

    Texture2DArray depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, {128, 128, 8});

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachTextureLayer(Framebuffer::ColorAttachment(0), color, 0, 3)
               .attachTextureLayer(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0, 3);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
void FramebufferGLTest::attachTexture2DMultisample() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_multisample>())
        CORRADE_SKIP(Extensions::ARB::texture_multisample::string() << "is not supported.");
    #else
    if(!Context::current().isVersionSupported(Version::GLES310))
        CORRADE_SKIP("OpenGL ES 3.1 is not supported.");
    #endif

    MultisampleTexture2D color;
    /* Mesa software implementation supports only 1 sample so we have to clamp */
    color.setStorage(Math::min(4, MultisampleTexture2D::maxColorSamples()),
        TextureFormat::RGBA8, {128, 128});

    MultisampleTexture2D depthStencil;
    /* Mesa software implementation supports only 1 sample so we have to clamp */
    depthStencil.setStorage(Math::min(4, MultisampleTexture2D::maxDepthSamples()),
        TextureFormat::Depth24Stencil8, {128, 128});

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachTexture(Framebuffer::ColorAttachment(0), color)
               .attachTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

void FramebufferGLTest::attachTexture2DMultisampleArray() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_multisample>())
        CORRADE_SKIP(Extensions::ARB::texture_multisample::string() << "is not supported.");
    #else
    if(!Context::current().isExtensionSupported<Extensions::OES::texture_storage_multisample_2d_array>())
        CORRADE_SKIP(Extensions::OES::texture_storage_multisample_2d_array::string() << "is not supported.");
    #endif

    MultisampleTexture2DArray color;
    /* Mesa software implementation supports only 1 sample so we have to clamp */
    color.setStorage(Math::min(4, MultisampleTexture2DArray::maxColorSamples()),
        TextureFormat::RGBA8, {128, 128, 8});

    MultisampleTexture2DArray depthStencil;
    /* Mesa software implementation supports only 1 sample so we have to clamp */
    depthStencil.setStorage(Math::min(4, MultisampleTexture2DArray::maxDepthSamples()),
        TextureFormat::Depth24Stencil8, {128, 128, 8});

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachTextureLayer(Framebuffer::ColorAttachment(0), color, 3)
               .attachTextureLayer(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 3);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::attachRectangleTexture() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_rectangle>())
        CORRADE_SKIP(Extensions::ARB::texture_rectangle::string() << "is not supported.");

    RectangleTexture color;
    color.setStorage(TextureFormat::RGBA8, Vector2i(128));

    RectangleTexture depthStencil;
    depthStencil.setStorage(TextureFormat::Depth24Stencil8, Vector2i(128));

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachTexture(Framebuffer::ColorAttachment(0), color)
               .attachTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

void FramebufferGLTest::attachCubeMapTexture() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});

    CubeMapTexture color;
    color.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i(128));
    framebuffer.attachCubeMapTexture(Framebuffer::ColorAttachment(0), color, CubeMapCoordinate::NegativeZ, 0);

    CubeMapTexture depthStencil;

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
        Debug() << "Using" << Extensions::OES::packed_depth_stencil::string();
        #endif

        #if !defined(MAGNUM_TARGET_GLES2) || defined(MAGNUM_TARGET_WEBGL)
        depthStencil.setStorage(1,
            #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
            TextureFormat::Depth24Stencil8,
            #else
            TextureFormat::DepthStencil,
            #endif
            Vector2i(128));
        framebuffer.attachCubeMapTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil, CubeMapCoordinate::NegativeZ, 0);
        #else
        depthStencil.setStorage(1, depthStencilFormatES2, Vector2i(128));
        framebuffer.attachCubeMapTexture(Framebuffer::BufferAttachment::Depth, depthStencil, CubeMapCoordinate::NegativeZ, 0)
                   .attachCubeMapTexture(Framebuffer::BufferAttachment::Stencil, depthStencil, CubeMapCoordinate::NegativeZ, 0);
        #endif
    }

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    else if(Context::current().isExtensionSupported<Extensions::OES::depth_texture>()) {
        Debug() << "Using" << Extensions::OES::depth_texture::string();

        depthStencil.setStorage(1, TextureFormat::DepthComponent16, Vector2i(128));
        framebuffer.attachCubeMapTexture(Framebuffer::BufferAttachment::Depth, depthStencil, CubeMapCoordinate::NegativeZ, 0);
    }
    #endif

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
void FramebufferGLTest::attachCubeMapTextureArray() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_cube_map_array>())
        CORRADE_SKIP(Extensions::ARB::texture_cube_map_array::string() << "is not supported.");
    #else
    if(!Context::current().isExtensionSupported<Extensions::EXT::texture_cube_map_array>())
        CORRADE_SKIP(Extensions::EXT::texture_cube_map_array::string() << "is not supported.");
    #endif

    CubeMapTextureArray color;
    color.setStorage(1, TextureFormat::RGBA8, {128, 128, 18});

    CubeMapTextureArray depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, {128, 128, 18});

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachTextureLayer(Framebuffer::ColorAttachment(0), color, 0, 3)
               .attachTextureLayer(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0, 3);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
void FramebufferGLTest::attachLayeredTexture3D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!Context::current().isExtensionSupported<Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    Texture3D color;
    color.setStorage(1, TextureFormat::RGBA8, Vector3i{128});

    Framebuffer framebuffer{{{}, Vector2i{128}}};
    framebuffer.attachLayeredTexture(Framebuffer::ColorAttachment{0}, color, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::attachLayeredTexture1DArray() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(Extensions::ARB::geometry_shader4::string() << "is not supported.");

    Texture1DArray color;
    color.setStorage(1, TextureFormat::RGBA8, {128, 8});

    Texture1DArray depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, {128, 8});

    Framebuffer framebuffer{{{}, {128, 1}}};
    framebuffer.attachLayeredTexture(Framebuffer::ColorAttachment{0}, color, 0)
               .attachLayeredTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

void FramebufferGLTest::attachLayeredTexture2DArray() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(Extensions::ARB::geometry_shader4::string() << "is not supported.");
    #else
    if(!Context::current().isExtensionSupported<Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(Extensions::EXT::geometry_shader::string() << "is not supported.");
    #endif

    Texture2DArray color;
    color.setStorage(1, TextureFormat::RGBA8, {128, 128, 8});

    Texture2DArray depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, {128, 128, 8});

    Framebuffer framebuffer{{{}, Vector2i{128}}};
    framebuffer.attachLayeredTexture(Framebuffer::ColorAttachment{0}, color, 0)
               .attachLayeredTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

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

    CubeMapTexture color;
    color.setStorage(1, TextureFormat::RGBA8, Vector2i{128});

    CubeMapTexture depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, Vector2i{128});

    Framebuffer framebuffer{{{}, Vector2i{128}}};
    framebuffer.attachLayeredTexture(Framebuffer::ColorAttachment{0}, color, 0)
               .attachLayeredTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

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

    CubeMapTextureArray color;
    color.setStorage(1, TextureFormat::RGBA8, {128, 128, 18});

    CubeMapTextureArray depthStencil;
    depthStencil.setStorage(1, TextureFormat::Depth24Stencil8, {128, 128, 18});

    Framebuffer framebuffer{{{}, Vector2i{128}}};
    framebuffer.attachLayeredTexture(Framebuffer::ColorAttachment{0}, color, 0)
               .attachLayeredTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil, 0);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

void FramebufferGLTest::attachLayeredTexture2DMultisampleArray() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::geometry_shader4>())
        CORRADE_SKIP(Extensions::ARB::geometry_shader4::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_multisample>())
        CORRADE_SKIP(Extensions::ARB::texture_multisample::string() << "is not supported.");
    #else
    if(!Context::current().isExtensionSupported<Extensions::EXT::geometry_shader>())
        CORRADE_SKIP(Extensions::EXT::geometry_shader::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::OES::texture_storage_multisample_2d_array>())
        CORRADE_SKIP(Extensions::OES::texture_storage_multisample_2d_array::string() << "is not supported.");
    #endif

    MultisampleTexture2DArray color;
    /* Mesa software implementation supports only 1 sample so we have to clamp */
    color.setStorage(Math::min(4, MultisampleTexture2DArray::maxColorSamples()),
        TextureFormat::RGBA8, {128, 128, 8});

    MultisampleTexture2DArray depthStencil;
    /* Mesa software implementation supports only 1 sample so we have to clamp */
    depthStencil.setStorage(Math::min(4, MultisampleTexture2DArray::maxDepthSamples()),
        TextureFormat::Depth24Stencil8, {128, 128, 8});

    Framebuffer framebuffer{{{}, Vector2i{128}}};
    framebuffer.attachLayeredTexture(Framebuffer::ColorAttachment{0}, color)
               .attachLayeredTexture(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}
#endif

void FramebufferGLTest::detach() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.detach(Framebuffer::ColorAttachment(0))
               .detach(Framebuffer::BufferAttachment::Depth)
               .detach(Framebuffer::BufferAttachment::Stencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
}

void FramebufferGLTest::multipleColorOutputs() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #elif defined(MAGNUM_TARGET_GLES2)
    #ifdef MAGNUM_TARGET_WEBGL
    if(!Context::current().isExtensionSupported<Extensions::WEBGL::draw_buffers>())
        CORRADE_SKIP(Extensions::WEBGL::draw_buffers::string() << "is not supported.");
    #else
    if(!Context::current().isExtensionSupported<Extensions::EXT::draw_buffers>() &&
       !Context::current().isExtensionSupported<Extensions::NV::draw_buffers>())
        CORRADE_SKIP("No required extension available.");
    #endif
    #endif

    Texture2D color1;
    color1.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i(128));

    Texture2D color2;
    color2.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i(128));

    Renderbuffer depth;
    depth.setStorage(RenderbufferFormat::DepthComponent16, Vector2i(128));

    /* According to EXT_draw_buffers, the <i>th value in <bufs> has to be
       either COLOR_ATTACHMENT<i>_EXT or NONE, so watch out -- list them in
       order. */
    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachTexture(Framebuffer::ColorAttachment(0), color2, 0)
               .attachTexture(Framebuffer::ColorAttachment(1), color1, 0)
               .attachRenderbuffer(Framebuffer::BufferAttachment::Depth, depth)
               .mapForDraw({{0, Framebuffer::ColorAttachment(0)},
                            {1, Framebuffer::ColorAttachment(1)},
                            {2, Framebuffer::DrawAttachment::None}});

    #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
    #ifdef MAGNUM_TARGET_GLES2
    if(Context::current().isExtensionSupported<Extensions::NV::read_buffer>())
    #endif
    {
        #ifdef MAGNUM_TARGET_GLES2
        Debug() << "Using" << Extensions::NV::read_buffer::string();
        #endif
        framebuffer.mapForRead(Framebuffer::ColorAttachment(1));
    }
    #endif

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
}

void FramebufferGLTest::clear() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    /* Separate depth and stencil renderbuffers are not supported (or at least
       on my NVidia, thus we need to do this juggling with one renderbuffer */
    Renderbuffer depthStencil;
    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
        Debug() << "Using" << Extensions::OES::packed_depth_stencil::string();
        #endif
        depthStencil.setStorage(
            #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
            RenderbufferFormat::Depth24Stencil8,
            #else
            RenderbufferFormat::DepthStencil,
            #endif
            Vector2i(128));
    }
    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    else depthStencil.setStorage(RenderbufferFormat::DepthComponent16, Vector2i(128));
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::Depth, depthStencil);

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        framebuffer.attachRenderbuffer(Framebuffer::BufferAttachment::Stencil, depthStencil);
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.clear(FramebufferClear::Color|FramebufferClear::Depth|FramebufferClear::Stencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
}

#ifndef MAGNUM_TARGET_GLES2
void FramebufferGLTest::clearColorI() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isVersionSupported(Version::GL300))
        CORRADE_SKIP("GL 3.0 is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8I, Vector2i{16});

    Framebuffer framebuffer({{}, Vector2i{16}});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment{0}, color);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.clearColor(0, Vector4i{-124, 67, 37, 17});

    MAGNUM_VERIFY_NO_GL_ERROR();

    Image2D colorImage = framebuffer.read({{}, Vector2i{1}},
        {PixelFormat::RGBAInteger, PixelType::Int});

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(Containers::arrayCast<Vector4i>(colorImage.data())[0], (Vector4i{-124, 67, 37, 17}));
}

void FramebufferGLTest::clearColorUI() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isVersionSupported(Version::GL300))
        CORRADE_SKIP("GL 3.0 is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8UI, Vector2i{16});

    Framebuffer framebuffer({{}, Vector2i{16}});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment{0}, color);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.clearColor(0, Vector4ui{240, 67, 37, 17});

    MAGNUM_VERIFY_NO_GL_ERROR();

    Image2D colorImage = framebuffer.read({{}, Vector2i{1}},
        {PixelFormat::RGBAInteger, PixelType::UnsignedInt});

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(Containers::arrayCast<Vector4ui>(colorImage.data())[0], (Vector4ui{240, 67, 37, 17}));
}

void FramebufferGLTest::clearColorF() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isVersionSupported(Version::GL300))
        CORRADE_SKIP("GL 3.0 is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i{16});

    Framebuffer framebuffer({{}, Vector2i{16}});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment{0}, color);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.clearColor(0, Math::unpack<Color4>(Color4ub{128, 64, 32, 17}));

    MAGNUM_VERIFY_NO_GL_ERROR();

    Image2D colorImage = framebuffer.read({{}, Vector2i{1}},
        {PixelFormat::RGBA, PixelType::UnsignedByte});

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(colorImage.data())[0], (Color4ub{128, 64, 32, 17}));
}

void FramebufferGLTest::clearDepth() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isVersionSupported(Version::GL300))
        CORRADE_SKIP("GL 3.0 is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i{16});

    /* Separate depth and stencil renderbuffers are not supported (or at least
       on my NVidia, thus we need to do this juggling with one renderbuffer */
    Renderbuffer depthStencil;
    depthStencil.setStorage(RenderbufferFormat::Depth24Stencil8, Vector2i{16});

    Framebuffer framebuffer({{}, Vector2i{16}});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment{0}, color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.clearDepth(Math::unpack<Float, UnsignedShort>(48352));

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_WEBGL
    #ifdef MAGNUM_TARGET_GLES
    if(Context::current().isExtensionSupported<Extensions::NV::read_depth>())
    #endif
    {
        #ifdef MAGNUM_TARGET_GLES
        Debug() << "Using" << Extensions::NV::read_depth::string();
        #endif

        Image2D depthImage = framebuffer.read({{}, Vector2i{1}}, {PixelFormat::DepthComponent, PixelType::UnsignedShort});

        MAGNUM_VERIFY_NO_GL_ERROR();
        CORRADE_COMPARE(Containers::arrayCast<UnsignedShort>(depthImage.data())[0], 48352);
    }
    #endif
}

void FramebufferGLTest::clearStencil() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isVersionSupported(Version::GL300))
        CORRADE_SKIP("GL 3.0 is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i{16});

    Renderbuffer depthStencil;
    depthStencil.setStorage(RenderbufferFormat::Depth24Stencil8, Vector2i{16});

    Framebuffer framebuffer({{}, Vector2i{16}});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment{0}, color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.clearStencil(67);

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_WEBGL
    #ifdef MAGNUM_TARGET_GLES
    if(Context::current().isExtensionSupported<Extensions::NV::read_stencil>())
    #endif
    {
        #ifdef MAGNUM_TARGET_GLES
        Debug() << "Using" << Extensions::NV::read_stencil::string();
        #endif

        Image2D stencilImage = framebuffer.read({{}, Vector2i{1}}, {PixelFormat::StencilIndex, PixelType::UnsignedByte});

        MAGNUM_VERIFY_NO_GL_ERROR();

        #ifdef MAGNUM_TARGET_GLES
        /* If you're bored -- here's the code in question, I have no idea where
           to look for the error: https://github.com/google/swiftshader/commit/d1ed57e6942ec88e2c925d602b3830c7dc3bf213 */
        CORRADE_EXPECT_FAIL_IF(Context::current().detectedDriver() & Context::DetectedDriver::SwiftShader,
            "SwiftShader has buggy NV_read_stencil.");
        #endif

        CORRADE_COMPARE(Containers::arrayCast<UnsignedByte>(stencilImage.data())[0], 67);
    }
    #endif
}

void FramebufferGLTest::clearDepthStencil() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isVersionSupported(Version::GL300))
        CORRADE_SKIP("GL 3.0 is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i{16});

    /* Separate depth and stencil renderbuffers are not supported (or at least
       on my NVidia, thus we need to do this juggling with one renderbuffer */
    Renderbuffer depthStencil;
    depthStencil.setStorage(RenderbufferFormat::Depth24Stencil8, Vector2i{16});

    Framebuffer framebuffer({{}, Vector2i{16}});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment{0}, color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.clearDepthStencil(Math::unpack<Float, UnsignedShort>(48352), 67);

    #ifndef MAGNUM_TARGET_WEBGL
    #ifdef MAGNUM_TARGET_GLES
    if(Context::current().isExtensionSupported<Extensions::NV::read_depth_stencil>())
    #endif
    {
        #ifdef MAGNUM_TARGET_GLES
        Debug() << "Using" << Extensions::NV::read_depth_stencil::string();
        #endif

        Image2D depthStencilImage = framebuffer.read({{}, Vector2i{1}}, {PixelFormat::DepthStencil, PixelType::UnsignedInt248});

        MAGNUM_VERIFY_NO_GL_ERROR();
        /** @todo This will probably fail on different systems */
        CORRADE_COMPARE(Containers::arrayCast<UnsignedInt>(depthStencilImage.data())[0] >> 8, 12378300);
        CORRADE_COMPARE(Containers::arrayCast<UnsignedByte>(depthStencilImage.data())[0], 67);
    }
    #endif
}
#endif

#if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
void FramebufferGLTest::invalidate() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    Renderbuffer stencil;
    stencil.setStorage(RenderbufferFormat::StencilIndex8, Vector2i(128));

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::Stencil, stencil);

    MAGNUM_VERIFY_NO_GL_ERROR();

    framebuffer.invalidate({Framebuffer::InvalidationAttachment::Depth, Framebuffer::ColorAttachment(0)});

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES2
    /* Invalidating combined bits should work as well even if there's just stencil alone */
    framebuffer.invalidate({Framebuffer::InvalidationAttachment::DepthStencil});

    MAGNUM_VERIFY_NO_GL_ERROR();
    #endif
}
#endif

#ifndef MAGNUM_TARGET_GLES2
void FramebufferGLTest::invalidateCombinedDepthStencil() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Renderbuffer depthStencil;
    depthStencil.setStorage(RenderbufferFormat::Depth24Stencil8, Vector2i(128));

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();

    framebuffer.invalidate({Framebuffer::InvalidationAttachment::DepthStencil});

    MAGNUM_VERIFY_NO_GL_ERROR();

    /* Invalidating separate bits should work as well */
    framebuffer.invalidate({Framebuffer::InvalidationAttachment::Depth,
                            Framebuffer::InvalidationAttachment::Stencil});

    MAGNUM_VERIFY_NO_GL_ERROR();
}
#endif

#ifndef MAGNUM_TARGET_GLES2
void FramebufferGLTest::invalidateSub() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));

    Renderbuffer depth;
    depth.setStorage(RenderbufferFormat::DepthComponent16, Vector2i(128));

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::Depth, depth);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    framebuffer.invalidate({Framebuffer::InvalidationAttachment::Depth, Framebuffer::ColorAttachment(0)},
                           {{32, 16}, {79, 64}});

    MAGNUM_VERIFY_NO_GL_ERROR();
}
#endif

const auto DataStorage = PixelStorage{}.setSkip({0, 16, 0});
const std::size_t DataOffset = 16*8;

void FramebufferGLTest::read() {
    using namespace Math::Literals;

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

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    /* Separate depth and stencil renderbuffers are not supported (or at least
       on my NVidia, thus we need to do this juggling with one renderbuffer */
    Renderbuffer depthStencil;
    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
        Debug() << "Using" << Extensions::OES::packed_depth_stencil::string();
        #endif
        depthStencil.setStorage(
            #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
            RenderbufferFormat::Depth24Stencil8,
            #else
            RenderbufferFormat::DepthStencil,
            #endif
            Vector2i(128));
    }
    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    else depthStencil.setStorage(RenderbufferFormat::DepthComponent16, Vector2i(128));
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::Depth, depthStencil);

    #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
    if(Context::current().isExtensionSupported<Extensions::OES::packed_depth_stencil>())
    #endif
    {
        framebuffer.attachRenderbuffer(Framebuffer::BufferAttachment::Stencil, depthStencil);
    }

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    #ifndef MAGNUM_TARGET_GLES2
    Renderer::setClearColor(0x80402011_rgbaf);
    #else
    /* Using only RGBA4, supply less precision. This has to be one on the input
       because SwiftShader stores RGBA4 as RGBA8 internally, thus preserving
       the full precision of the input. */
    Renderer::setClearColor(0x88442211_rgbaf);
    #endif
    Renderer::setClearDepth(Math::unpack<Float, UnsignedShort>(48352));
    Renderer::setClearStencil(67);
    framebuffer.clear(FramebufferClear::Color|FramebufferClear::Depth|FramebufferClear::Stencil);

    Image2D colorImage = framebuffer.read(Range2Di::fromSize({16, 8}, {8, 16}),
        {DataStorage, PixelFormat::RGBA, PixelType::UnsignedByte});

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(colorImage.size(), Vector2i(8, 16));
    CORRADE_COMPARE(colorImage.data().size(), (DataOffset + 8*16)*sizeof(Color4ub));
    #ifndef MAGNUM_TARGET_GLES2
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(colorImage.data())[DataOffset], 0x80402011_rgba);
    #else /* using only RGBA4, less precision */
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(colorImage.data())[DataOffset], 0x88442211_rgba);
    #endif

    #ifndef MAGNUM_TARGET_WEBGL
    #ifdef MAGNUM_TARGET_GLES
    if(Context::current().isExtensionSupported<Extensions::NV::read_depth>())
    #endif
    {
        #ifdef MAGNUM_TARGET_GLES
        Debug() << "Using" << Extensions::NV::read_depth::string();
        #endif

        Image2D depthImage = framebuffer.read({{}, Vector2i{1}}, {PixelFormat::DepthComponent, PixelType::UnsignedShort});

        MAGNUM_VERIFY_NO_GL_ERROR();
        CORRADE_COMPARE(Containers::arrayCast<UnsignedShort>(depthImage.data())[0], 48352);
    }

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

        Image2D stencilImage = framebuffer.read({{}, Vector2i{1}}, {PixelFormat::StencilIndex, PixelType::UnsignedByte});

        MAGNUM_VERIFY_NO_GL_ERROR();

        #ifdef MAGNUM_TARGET_GLES
        /* If you're bored -- here's the code in question, I have no idea where
           to look for the error: https://github.com/google/swiftshader/commit/d1ed57e6942ec88e2c925d602b3830c7dc3bf213 */
        CORRADE_EXPECT_FAIL_IF(Context::current().detectedDriver() & Context::DetectedDriver::SwiftShader,
            "SwiftShader has buggy NV_read_stencil.");
        #endif

        CORRADE_COMPARE(Containers::arrayCast<UnsignedByte>(stencilImage.data())[0], 67);
    }

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

        Image2D depthStencilImage = framebuffer.read({{}, Vector2i{1}}, {PixelFormat::DepthStencil, PixelType::UnsignedInt248});

        MAGNUM_VERIFY_NO_GL_ERROR();
        /** @todo This will probably fail on different systems */
        CORRADE_COMPARE(Containers::arrayCast<UnsignedInt>(depthStencilImage.data())[0] >> 8, 12378300);
        CORRADE_COMPARE(Containers::arrayCast<UnsignedByte>(depthStencilImage.data())[0], 67);
    }
    #endif
}

void FramebufferGLTest::readView() {
    using namespace Math::Literals;

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

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    #ifndef MAGNUM_TARGET_GLES2
    Renderer::setClearColor(0x80402011_rgbaf);
    #else
    /* Using only RGBA4, supply less precision. This has to be one on the input
       because SwiftShader stores RGBA4 as RGBA8 internally, thus preserving
       the full precision of the input. */
    Renderer::setClearColor(0x88442211_rgbaf);
    #endif
    Renderer::setClearDepth(Math::unpack<Float, UnsignedShort>(48352));
    Renderer::setClearStencil(67);
    framebuffer.clear(FramebufferClear::Color);

    char data[(DataOffset + 8*16)*sizeof(Color4ub)]{};
    MutableImageView2D view{DataStorage, PixelFormat::RGBA, PixelType::UnsignedByte, {8, 16}, data};
    framebuffer.read(Range2Di::fromSize({16, 8}, {8, 16}), view);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(view.size(), Vector2i(8, 16));
    CORRADE_COMPARE(view.data().size(), (DataOffset + 8*16)*sizeof(Color4ub));
    #ifndef MAGNUM_TARGET_GLES2
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(view.data())[DataOffset], 0x80402011_rgba);
    #else /* using only RGBA4, less precision */
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(view.data())[DataOffset], 0x88442211_rgba);
    #endif
}

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

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

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color);

    MutableImageView2D view{DataStorage, PixelFormat::RGBA, PixelType::UnsignedByte, {8, 16}};

    std::ostringstream out;
    Error redirectError{&out};
    framebuffer.read({{}, {8, 16}}, view);
    CORRADE_COMPARE(out.str(), "GL::AbstractFramebuffer::read(): image view is nullptr\n");
}

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

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

    Renderbuffer color;
    #ifndef MAGNUM_TARGET_GLES2
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    color.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color);

    char data[(DataOffset + 8*15)*sizeof(Color4ub)]{};
    MutableImageView2D view{DataStorage, PixelFormat::RGBA, PixelType::UnsignedByte, {8, 15}, data};

    std::ostringstream out;
    Error redirectError{&out};
    framebuffer.read({{}, {8, 16}}, view);
    CORRADE_COMPARE(out.str(), "GL::AbstractFramebuffer::read(): expected image view size Vector(8, 16) but got Vector(8, 15)\n");
}

#ifndef MAGNUM_TARGET_GLES2
void FramebufferGLTest::readBuffer() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Renderbuffer color;
    color.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));

    Renderbuffer depthStencil;
    depthStencil.setStorage(RenderbufferFormat::Depth24Stencil8, Vector2i(128));

    Framebuffer framebuffer({{}, Vector2i(128)});
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment(0), color)
               .attachRenderbuffer(Framebuffer::BufferAttachment::DepthStencil, depthStencil);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(framebuffer.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    Renderer::setClearColor(Math::unpack<Color4>(Color4ub(128, 64, 32, 17)));
    Renderer::setClearDepth(Math::unpack<Float, UnsignedShort>(48352));
    Renderer::setClearStencil(67);
    framebuffer.clear(FramebufferClear::Color|FramebufferClear::Depth|FramebufferClear::Stencil);

    BufferImage2D colorImage = framebuffer.read(Range2Di::fromSize({16, 8}, {8, 16}),
        {DataStorage, PixelFormat::RGBA, PixelType::UnsignedByte}, BufferUsage::StaticRead);
    CORRADE_COMPARE(colorImage.size(), Vector2i(8, 16));

    MAGNUM_VERIFY_NO_GL_ERROR();
    /** @todo How to test this on ES? */
    #ifndef MAGNUM_TARGET_GLES
    auto colorData = colorImage.buffer().data();
    CORRADE_COMPARE(colorData.size(), (DataOffset + 8*16)*sizeof(Color4ub));
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(colorData)[DataOffset], Color4ub(128, 64, 32, 17));
    #endif
}
#endif

constexpr char StorageData[]{
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f,
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f
};

constexpr char ZeroStorage[4*4*4*6]{};

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::copyImageTexture1D() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture1D texture;
    fb.copyImage(Range2Di::fromSize(Vector2i{1}, {2, 1}), texture, 0, TextureFormat::RGBA8);

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE(texture.imageSize(0)[0], 2);
    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b}),
        TestSuite::Compare::Container);
}
#endif

void FramebufferGLTest::copyImageTexture2D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Texture2D storage;
    storage.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture2D texture;
    fb.copyImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2
        #else
        TextureFormat::RGBA
        #endif
        );

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES
    CORRADE_COMPARE(texture.imageSize(0), Vector2i{2});
    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
            0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b}),
        TestSuite::Compare::Container);
    #endif
}

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::copyImageTexture1DArray() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::EXT::texture_array>())
        CORRADE_SKIP(Extensions::EXT::texture_array::string() << "is not supported.");

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture1DArray texture;
    fb.copyImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0, TextureFormat::RGBA8);

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE(texture.imageSize(0), Vector2i{2});
    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
            0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b}),
        TestSuite::Compare::Container);
}

void FramebufferGLTest::copyImageRectangleTexture() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_rectangle>())
        CORRADE_SKIP(Extensions::ARB::texture_rectangle::string() << "is not supported.");

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    RectangleTexture texture;
    fb.copyImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, TextureFormat::RGBA8);

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE(texture.imageSize(), Vector2i{2});
    CORRADE_COMPARE_AS(texture.image({PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
            0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b}),
        TestSuite::Compare::Container);
}
#endif

void FramebufferGLTest::copyImageCubeMapTexture() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    #ifndef MAGNUM_TARGET_GLES2
    constexpr TextureFormat format = TextureFormat::RGBA8;
    #elif !defined(MAGNUM_TARGET_WEBGL)
    const TextureFormat format = rgbaFormatES2;
    #else
    constexpr TextureFormat format = TextureFormat::RGBA;
    #endif

    Texture2D storage;
    storage.setStorage(1, format, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    constexpr UnsignedByte Zero[2*2*4]{};

    CubeMapTexture texture;
    texture.setImage(CubeMapCoordinate::PositiveX, 0, format,
        ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
    texture.setImage(CubeMapCoordinate::NegativeX, 0, format,
        ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
    texture.setImage(CubeMapCoordinate::PositiveY, 0, format,
        ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
    texture.setImage(CubeMapCoordinate::NegativeY, 0, format,
        ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
    texture.setImage(CubeMapCoordinate::PositiveZ, 0, format,
        ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});
    texture.setImage(CubeMapCoordinate::NegativeZ, 0, format,
        ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i(2), Zero});

    fb.copyImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, CubeMapCoordinate::PositiveX, 0, format);

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES
    CORRADE_COMPARE(texture.imageSize(0), Vector2i{2});
    CORRADE_COMPARE_AS(texture.image(CubeMapCoordinate::PositiveX, 0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b,
            0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b}),
        TestSuite::Compare::Container);
    #endif
}

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::copySubImageTexture1D() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture1D texture;
    texture.setStorage(1, TextureFormat::RGBA8, 4)
        .setSubImage(0, {}, ImageView1D{PixelFormat::RGBA, PixelType::UnsignedByte, 4, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, {2, 1}), texture, 0, 1);

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
}
#endif

void FramebufferGLTest::copySubImageTexture2D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Texture2D storage;
    storage.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture2D texture;
    texture.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0, Vector2i{1});

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES
    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
    #endif
}

#if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
void FramebufferGLTest::copySubImageTexture3D() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #elif defined(MAGNUM_TARGET_GLES2)
    if(!Context::current().isExtensionSupported<Extensions::OES::texture_3D>())
        CORRADE_SKIP(Extensions::OES::texture_3D::string() << "is not supported.");
    #endif

    Texture2D storage;
    storage.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #else
        rgbaFormatES2,
        #endif
        Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture3D texture;
    texture.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #else
        rgbaFormatES2,
        #endif
        {4, 4, 2})
        .setSubImage(0, {}, ImageView3D{PixelFormat::RGBA, PixelType::UnsignedByte, {4, 4, 2}, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0, Vector3i{1});

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES
    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
    #endif
}
#endif

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::copySubImageTexture1DArray() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::EXT::texture_array>())
        CORRADE_SKIP(Extensions::EXT::texture_array::string() << "is not supported.");

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture1DArray texture;
    texture.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0, Vector2i{1});

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
}
#endif

#ifndef MAGNUM_TARGET_GLES2
void FramebufferGLTest::copySubImageTexture2DArray() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::EXT::texture_array>())
        CORRADE_SKIP(Extensions::EXT::texture_array::string() << "is not supported.");
    #endif

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    Texture2DArray texture;
    texture.setStorage(1, TextureFormat::RGBA8, {4, 4, 2})
        .setSubImage(0, {}, ImageView3D{PixelFormat::RGBA, PixelType::UnsignedByte, {4, 4, 2}, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0, Vector3i{1});

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES
    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
    #endif
}
#endif

#ifndef MAGNUM_TARGET_GLES
void FramebufferGLTest::copySubImageRectangleTexture() {
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_rectangle>())
        CORRADE_SKIP(Extensions::ARB::texture_rectangle::string() << "is not supported.");

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    RectangleTexture texture;
    texture.setStorage(TextureFormat::RGBA8, Vector2i{4})
        .setSubImage({}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, Vector2i{1});

    MAGNUM_VERIFY_NO_GL_ERROR();

    CORRADE_COMPARE_AS(texture.image({PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
}
#endif

void FramebufferGLTest::copySubImageCubeMapTexture() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #endif

    Texture2D storage;
    storage.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    CubeMapTexture texture;
    texture.setStorage(1,
        #ifndef MAGNUM_TARGET_GLES2
        TextureFormat::RGBA8,
        #elif !defined(MAGNUM_TARGET_WEBGL)
        rgbaFormatES2,
        #else
        TextureFormat::RGBA,
        #endif
        Vector2i{4})
        .setSubImage(CubeMapCoordinate::NegativeY, 0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0, {1, 1, 3});

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES
    CORRADE_COMPARE_AS(texture.image(CubeMapCoordinate::NegativeY, 0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
    #endif
}

#if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
void FramebufferGLTest::copySubImageCubeMapTextureArray() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    if(!Context::current().isExtensionSupported<Extensions::ARB::texture_cube_map_array>())
        CORRADE_SKIP(Extensions::ARB::texture_cube_map_array::string() << "is not supported.");
    #else
    if(!Context::current().isExtensionSupported<Extensions::EXT::texture_cube_map_array>())
        CORRADE_SKIP(Extensions::EXT::texture_cube_map_array::string() << "is not supported.");
    #endif

    Texture2D storage;
    storage.setStorage(1, TextureFormat::RGBA8, Vector2i{4})
        .setSubImage(0, {}, ImageView2D{PixelFormat::RGBA, PixelType::UnsignedByte, Vector2i{4}, StorageData});

    Framebuffer fb{{{}, Vector2i{4}}};
    fb.attachTexture(Framebuffer::ColorAttachment{0}, storage, 0);

    CubeMapTextureArray texture;
    texture.setStorage(1, TextureFormat::RGBA8, {4, 4, 6})
        .setSubImage(0, {}, ImageView3D{PixelFormat::RGBA, PixelType::UnsignedByte, {4, 4, 6}, ZeroStorage});
    fb.copySubImage(Range2Di::fromSize(Vector2i{1}, Vector2i{2}), texture, 0, {1, 1, 3});

    MAGNUM_VERIFY_NO_GL_ERROR();

    #ifndef MAGNUM_TARGET_GLES
    CORRADE_COMPARE_AS(texture.image(0, {PixelFormat::RGBA, PixelType::UnsignedByte}).release(),
        Containers::arrayView<char>({
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00}),
        TestSuite::Compare::Container);
    #endif
}
#endif

#if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
void FramebufferGLTest::blit() {
    #ifndef MAGNUM_TARGET_GLES
    if(!Context::current().isExtensionSupported<Extensions::ARB::framebuffer_object>())
        CORRADE_SKIP(Extensions::ARB::framebuffer_object::string() << "is not supported.");
    #elif defined(MAGNUM_TARGET_GLES2)
    if(!Context::current().isExtensionSupported<Extensions::ANGLE::framebuffer_blit>() &&
       !Context::current().isExtensionSupported<Extensions::NV::framebuffer_blit>())
        CORRADE_SKIP("Neither" << Extensions::ANGLE::framebuffer_blit::string() << "nor" << Extensions::NV::framebuffer_blit::string() << "is supported.");
    #endif

    Renderbuffer colorA, colorB;
    #ifndef MAGNUM_TARGET_GLES2
    colorA.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    colorB.setStorage(RenderbufferFormat::RGBA8, Vector2i(128));
    #else
    colorA.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    colorB.setStorage(RenderbufferFormat::RGBA4, Vector2i(128));
    #endif

    Framebuffer a({{}, Vector2i(128)}), b({{}, Vector2i(128)});;
    a.attachRenderbuffer(Framebuffer::ColorAttachment(0), colorA);
    b.attachRenderbuffer(Framebuffer::ColorAttachment(0), colorB);

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(a.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(a.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);
    CORRADE_COMPARE(b.checkStatus(FramebufferTarget::Read), Framebuffer::Status::Complete);
    CORRADE_COMPARE(b.checkStatus(FramebufferTarget::Draw), Framebuffer::Status::Complete);

    /* Clear first with some color and second with another */
    Renderer::setClearColor(Math::unpack<Color4>(Color4ub(128, 64, 32, 17)));
    a.clear(FramebufferClear::Color);
    Renderer::setClearColor({});
    b.clear(FramebufferClear::Color);

    /* The framebuffer should be black before */
    Image2D imageBefore = b.read({{}, Vector2i{1}}, {PixelFormat::RGBA, PixelType::UnsignedByte});

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(imageBefore.data())[0], Color4ub());

    /* And have given color after */
    Framebuffer::blit(a, b, a.viewport(), FramebufferBlit::Color);
    Image2D imageAfter = b.read({{}, Vector2i{1}}, {PixelFormat::RGBA, PixelType::UnsignedByte});

    MAGNUM_VERIFY_NO_GL_ERROR();
    CORRADE_COMPARE(Containers::arrayCast<Color4ub>(imageAfter.data())[0], Color4ub(128, 64, 32, 17));
}
#endif

void FramebufferGLTest::implementationColorReadFormat() {
    auto&& data = ImplementationColorReadFormatData[testCaseInstanceId()];
    setTestCaseDescription(data.name);

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

    Renderbuffer color;
    color.setStorage(data.renderbufferFormat, {32, 32});
    Framebuffer framebuffer{{{}, {32, 32}}};
    framebuffer.attachRenderbuffer(Framebuffer::ColorAttachment{0}, color);

    PixelFormat format = framebuffer.implementationColorReadFormat();
    PixelType type = framebuffer.implementationColorReadType();

    {
        #ifdef CORRADE_TARGET_WINDOWS
        CORRADE_EXPECT_FAIL_IF((Context::current().detectedDriver() & Context::DetectedDriver::IntelWindows) && data.renderbufferFormat != RenderbufferFormat::RGBA8,
            "Framebuffer format queries on Intel Windows drivers are broken beyond repair for any non-trivial value.");
        #endif
        MAGNUM_VERIFY_NO_GL_ERROR();
    } {
        #ifdef CORRADE_TARGET_WINDOWS
        CORRADE_EXPECT_FAIL_IF(((Context::current().detectedDriver() & Context::DetectedDriver::IntelWindows) && data.renderbufferFormat != RenderbufferFormat::RGBA8) || ((Context::current().detectedDriver() & Context::DetectedDriver::Amd) && data.renderbufferFormat != RenderbufferFormat::RGBA8 && data.renderbufferFormat != RenderbufferFormat::RGBA16F),
            "Framebuffer format queries on Intel Windows drivers are broken beyond repair for any non-trivial value; on AMD drivers always report RGBA8.");
        #endif
        CORRADE_COMPARE(format, data.expectedFormat);
    } {
        #ifdef CORRADE_TARGET_WINDOWS
        CORRADE_EXPECT_FAIL_IF(((Context::current().detectedDriver() & Context::DetectedDriver::IntelWindows) && data.renderbufferFormat != RenderbufferFormat::RGBA8) || ((Context::current().detectedDriver() & Context::DetectedDriver::Amd) && data.renderbufferFormat != RenderbufferFormat::RGBA8),
            "Framebuffer format queries on Intel Windows drivers are broken beyond repair for any non-trivial value; on AMD drivers always report RGBA8.");
        #endif
        CORRADE_COMPARE(type, data.expectedType);
    }
}

}}}}

CORRADE_TEST_MAIN(Magnum::GL::Test::FramebufferGLTest)