From 062055d20dbae253a28c74e6725b786f1d9a9b6f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Sun, 3 May 2020 17:54:33 +0200
Subject: [PATCH] Shaders: add vertex ID visualization to MeshVisualizer.

Helps visualizing face connectivity (or the lack of it).
---
 doc/changelog.dox                             |   4 +-
 src/Magnum/Shaders/MeshVisualizer.cpp         |  39 +++--
 src/Magnum/Shaders/MeshVisualizer.frag        |  52 ++++--
 src/Magnum/Shaders/MeshVisualizer.geom        |  12 +-
 src/Magnum/Shaders/MeshVisualizer.h           |  74 ++++++---
 src/Magnum/Shaders/MeshVisualizer.vert        |  29 ++++
 src/Magnum/Shaders/Test/CMakeLists.txt        |   6 +
 .../Shaders/Test/MeshVisualizerGLTest.cpp     | 149 ++++++++++++++----
 .../defaults-vertexid2D.tga                   | Bin 0 -> 12102 bytes
 .../defaults-vertexid3D.tga                   | Bin 0 -> 9981 bytes
 .../MeshVisualizerTestFiles/vertexid2D.tga    | Bin 0 -> 12932 bytes
 .../MeshVisualizerTestFiles/vertexid3D.tga    | Bin 0 -> 12015 bytes
 .../wireframe-vertexid2D.tga                  | Bin 0 -> 13488 bytes
 .../wireframe-vertexid3D.tga                  | Bin 0 -> 12019 bytes
 14 files changed, 277 insertions(+), 88 deletions(-)
 create mode 100644 src/Magnum/Shaders/Test/MeshVisualizerTestFiles/defaults-vertexid2D.tga
 create mode 100644 src/Magnum/Shaders/Test/MeshVisualizerTestFiles/defaults-vertexid3D.tga
 create mode 100644 src/Magnum/Shaders/Test/MeshVisualizerTestFiles/vertexid2D.tga
 create mode 100644 src/Magnum/Shaders/Test/MeshVisualizerTestFiles/vertexid3D.tga
 create mode 100644 src/Magnum/Shaders/Test/MeshVisualizerTestFiles/wireframe-vertexid2D.tga
 create mode 100644 src/Magnum/Shaders/Test/MeshVisualizerTestFiles/wireframe-vertexid3D.tga

diff --git a/doc/changelog.dox b/doc/changelog.dox
index 20584cba7..c1fe68d91 100644
--- a/doc/changelog.dox
+++ b/doc/changelog.dox
@@ -247,8 +247,8 @@ See also:
 
 -   New @ref Shaders::MeshVisualizer2D for 2D mesh visualization
 -   Tangent space visualization in @ref Shaders::MeshVisualizer3D
--   Object and primitive ID visualization in @ref Shaders::MeshVisualizer2D
-    and @ref Shaders::MeshVisualizer3D
+-   Object, vertex and primitive ID visualization in
+    @ref Shaders::MeshVisualizer2D and @ref Shaders::MeshVisualizer3D
 -   Texture coordinate transformation in @ref Shaders::DistanceFieldVector,
     @ref Shaders::Flat, @ref Shaders::Phong and @ref Shaders::Vector
 -   Ability to render Per-instance / per-vertex object ID in @ref Shaders::Flat
diff --git a/src/Magnum/Shaders/MeshVisualizer.cpp b/src/Magnum/Shaders/MeshVisualizer.cpp
index 03c78a1ba..72f886ea5 100644
--- a/src/Magnum/Shaders/MeshVisualizer.cpp
+++ b/src/Magnum/Shaders/MeshVisualizer.cpp
@@ -57,10 +57,11 @@ MeshVisualizerBase::MeshVisualizerBase(FlagsBase flags): _flags{flags} {
     #ifndef CORRADE_NO_ASSERT
     Int countMutuallyExclusive = 0;
     if(flags & FlagBase::InstancedObjectId) ++countMutuallyExclusive;
+    if(flags & FlagBase::VertexId) ++countMutuallyExclusive;
     if(flags & FlagBase::PrimitiveIdFromVertexId) ++countMutuallyExclusive;
     #endif
     CORRADE_ASSERT(countMutuallyExclusive <= 1,
-        "Shaders::MeshVisualizer: Flag::InstancedObjectId and Flag::PrimitiveId are mutually exclusive", );
+        "Shaders::MeshVisualizer: Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive", );
     #endif
 
     #ifndef MAGNUM_TARGET_GLES2
@@ -113,6 +114,7 @@ GL::Version MeshVisualizerBase::setupShaders(GL::Shader& vert, GL::Shader& frag,
     vert.addSource(_flags & FlagBase::Wireframe ? "#define WIREFRAME_RENDERING\n" : "")
         #ifndef MAGNUM_TARGET_GLES2
         .addSource(_flags & FlagBase::InstancedObjectId ? "#define INSTANCED_OBJECT_ID\n" : "")
+        .addSource(_flags & FlagBase::VertexId ? "#define VERTEX_ID\n" : "")
         .addSource(_flags >= FlagBase::PrimitiveIdFromVertexId ? "#define PRIMITIVE_ID_FROM_VERTEX_ID\n" : "")
         #endif
         #ifdef MAGNUM_TARGET_WEBGL
@@ -126,6 +128,7 @@ GL::Version MeshVisualizerBase::setupShaders(GL::Shader& vert, GL::Shader& frag,
         .addSource(_flags & FlagBase::NoGeometryShader ? "#define NO_GEOMETRY_SHADER\n" : "")
         #ifndef MAGNUM_TARGET_GLES2
         .addSource(_flags & FlagBase::InstancedObjectId ? "#define INSTANCED_OBJECT_ID\n" : "")
+        .addSource(_flags & FlagBase::VertexId ? "#define VERTEX_ID\n" : "")
         .addSource(_flags & FlagBase::PrimitiveId ?
             (_flags >= FlagBase::PrimitiveIdFromVertexId ?
                 "#define PRIMITIVE_ID_FROM_VERTEX_ID\n" :
@@ -138,8 +141,8 @@ GL::Version MeshVisualizerBase::setupShaders(GL::Shader& vert, GL::Shader& frag,
 
 MeshVisualizerBase& MeshVisualizerBase::setColor(const Color4& color) {
     #ifndef MAGNUM_TARGET_GLES2
-    CORRADE_ASSERT(_flags & (FlagBase::Wireframe|FlagBase::InstancedObjectId|FlagBase::PrimitiveId),
-        "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe or object/primitive ID enabled", *this);
+    CORRADE_ASSERT(_flags & (FlagBase::Wireframe|FlagBase::InstancedObjectId|FlagBase::VertexId|FlagBase::PrimitiveId),
+        "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe or object/vertex/primitive ID enabled", *this);
     #else
     CORRADE_ASSERT(_flags & FlagBase::Wireframe,
         "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe enabled", *this);
@@ -164,15 +167,15 @@ MeshVisualizerBase& MeshVisualizerBase::setWireframeWidth(const Float width) {
 
 #ifndef MAGNUM_TARGET_GLES2
 MeshVisualizerBase& MeshVisualizerBase::setColorMapTransformation(const Float offset, const Float scale) {
-    CORRADE_ASSERT(_flags & (FlagBase::InstancedObjectId|FlagBase::PrimitiveId),
-        "Shaders::MeshVisualizer::setColorMapTransformation(): the shader was not created with object/primitive ID enabled", *this);
+    CORRADE_ASSERT(_flags & (FlagBase::InstancedObjectId|FlagBase::VertexId|FlagBase::PrimitiveId),
+        "Shaders::MeshVisualizer::setColorMapTransformation(): the shader was not created with object/vertex/primitive ID enabled", *this);
     setUniform(_colorMapOffsetScaleUniform, Vector2{offset, scale});
     return *this;
 }
 
 MeshVisualizerBase& MeshVisualizerBase::bindColorMapTexture(GL::Texture2D& texture) {
-    CORRADE_ASSERT(_flags & (FlagBase::InstancedObjectId|FlagBase::PrimitiveId),
-        "Shaders::MeshVisualizer::bindColorMapTexture(): the shader was not created with object/primitive ID enabled", *this);
+    CORRADE_ASSERT(_flags & (FlagBase::InstancedObjectId|FlagBase::VertexId|FlagBase::PrimitiveId),
+        "Shaders::MeshVisualizer::bindColorMapTexture(): the shader was not created with object/vertex/primitive ID enabled", *this);
     texture.bind(ColorMapTextureUnit);
     return *this;
 }
@@ -182,7 +185,7 @@ MeshVisualizerBase& MeshVisualizerBase::bindColorMapTexture(GL::Texture2D& textu
 
 MeshVisualizer2D::MeshVisualizer2D(const Flags flags): Implementation::MeshVisualizerBase{Implementation::MeshVisualizerBase::FlagBase(UnsignedShort(flags))} {
     #ifndef MAGNUM_TARGET_GLES2
-    CORRADE_ASSERT(flags & ((Flag::Wireframe|Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId) & ~Flag::NoGeometryShader),
+    CORRADE_ASSERT(flags & ((Flag::Wireframe|Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId) & ~Flag::NoGeometryShader),
         "Shaders::MeshVisualizer2D: at least one visualization feature has to be enabled", );
     #else
     CORRADE_ASSERT(flags & (Flag::Wireframe & ~Flag::NoGeometryShader),
@@ -212,6 +215,7 @@ MeshVisualizer2D::MeshVisualizer2D(const Flags flags): Implementation::MeshVisua
         (*geom)
             .addSource("#define WIREFRAME_RENDERING\n#define MAX_VERTICES 3\n")
             .addSource(_flags & FlagBase::InstancedObjectId ? "#define INSTANCED_OBJECT_ID\n" : "")
+            .addSource(_flags & FlagBase::VertexId ? "#define VERTEX_ID\n" : "")
             .addSource(_flags & FlagBase::PrimitiveId ?
                 (_flags >= FlagBase::PrimitiveIdFromVertexId ?
                     "#define PRIMITIVE_ID_FROM_VERTEX_ID\n" :
@@ -264,7 +268,7 @@ MeshVisualizer2D::MeshVisualizer2D(const Flags flags): Implementation::MeshVisua
         _transformationProjectionMatrixUniform = uniformLocation("transformationProjectionMatrix");
         if(flags & (Flag::Wireframe
             #ifndef MAGNUM_TARGET_GLES2
-            |Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId
+            |Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId
             #endif
         ))
             _colorUniform = uniformLocation("color");
@@ -276,7 +280,7 @@ MeshVisualizer2D::MeshVisualizer2D(const Flags flags): Implementation::MeshVisua
                 _viewportSizeUniform = uniformLocation("viewportSize");
         }
         #ifndef MAGNUM_TARGET_GLES2
-        if(flags & (Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId)) {
+        if(flags & (Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId)) {
             _colorMapOffsetScaleUniform = uniformLocation("colorMapOffsetScale");
             setUniform(uniformLocation("colorMapTexture"), ColorMapTextureUnit);
         }
@@ -299,7 +303,7 @@ MeshVisualizer2D::MeshVisualizer2D(const Flags flags): Implementation::MeshVisua
         setSmoothness(2.0f);
     }
     #ifndef MAGNUM_TARGET_GLES2
-    if(flags & (Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId))
+    if(flags & (Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId))
         setColorMapTransformation(1.0f/512.0f, 1.0f/256.0f);
     #endif
     #endif
@@ -329,7 +333,7 @@ MeshVisualizer2D& MeshVisualizer2D::setSmoothness(const Float smoothness) {
 
 MeshVisualizer3D::MeshVisualizer3D(const Flags flags): Implementation::MeshVisualizerBase{Implementation::MeshVisualizerBase::FlagBase(UnsignedShort(flags))} {
     #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
-    CORRADE_ASSERT(flags & ((Flag::Wireframe|Flag::TangentDirection|Flag::BitangentFromTangentDirection|Flag::BitangentDirection|Flag::NormalDirection|Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId) & ~Flag::NoGeometryShader),
+    CORRADE_ASSERT(flags & ((Flag::Wireframe|Flag::TangentDirection|Flag::BitangentFromTangentDirection|Flag::BitangentDirection|Flag::NormalDirection|Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId) & ~Flag::NoGeometryShader),
         "Shaders::MeshVisualizer3D: at least one visualization feature has to be enabled", );
     CORRADE_ASSERT(!(flags & Flag::NoGeometryShader && flags & (Flag::TangentDirection|Flag::BitangentFromTangentDirection|Flag::BitangentDirection|Flag::NormalDirection)),
         "Shaders::MeshVisualizer3D: geometry shader has to be enabled when rendering TBN direction", );
@@ -394,6 +398,7 @@ MeshVisualizer3D::MeshVisualizer3D(const Flags flags): Implementation::MeshVisua
             .addSource(Utility::formatString("#define MAX_VERTICES {}\n", maxVertices))
             .addSource(flags & Flag::Wireframe ? "#define WIREFRAME_RENDERING\n" : "")
             .addSource(_flags & FlagBase::InstancedObjectId ? "#define INSTANCED_OBJECT_ID\n" : "")
+            .addSource(_flags & FlagBase::VertexId ? "#define VERTEX_ID\n" : "")
             .addSource(_flags & FlagBase::PrimitiveId ?
                 (_flags >= FlagBase::PrimitiveIdFromVertexId ?
                     "#define PRIMITIVE_ID_FROM_VERTEX_ID\n" :
@@ -461,7 +466,7 @@ MeshVisualizer3D::MeshVisualizer3D(const Flags flags): Implementation::MeshVisua
         _projectionMatrixUniform = uniformLocation("projectionMatrix");
         if(flags & (Flag::Wireframe
             #ifndef MAGNUM_TARGET_GLES2
-            |Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId
+            |Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId
             #endif
         ))
             _colorUniform = uniformLocation("color");
@@ -479,7 +484,7 @@ MeshVisualizer3D::MeshVisualizer3D(const Flags flags): Implementation::MeshVisua
                 _viewportSizeUniform = uniformLocation("viewportSize");
         }
         #ifndef MAGNUM_TARGET_GLES2
-        if(flags & (Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId)) {
+        if(flags & (Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId)) {
             _colorMapOffsetScaleUniform = uniformLocation("colorMapOffsetScale");
             setUniform(uniformLocation("colorMapTexture"), ColorMapTextureUnit);
         }
@@ -516,7 +521,7 @@ MeshVisualizer3D::MeshVisualizer3D(const Flags flags): Implementation::MeshVisua
         setSmoothness(2.0f);
     }
     #ifndef MAGNUM_TARGET_GLES2
-    if(flags & (Flag::InstancedObjectId|Flag::PrimitiveIdFromVertexId))
+    if(flags & (Flag::InstancedObjectId|Flag::VertexId|Flag::PrimitiveIdFromVertexId))
         setColorMapTransformation(1.0f/512.0f, 1.0f/256.0f);
     #endif
     #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
@@ -602,6 +607,7 @@ Debug& operator<<(Debug& debug, const MeshVisualizer2D::Flag value) {
         _c(Wireframe)
         #ifndef MAGNUM_TARGET_GLES2
         _c(InstancedObjectId)
+        _c(VertexId)
         #ifndef MAGNUM_TARGET_WEBGL
         _c(PrimitiveId)
         #endif
@@ -630,6 +636,7 @@ Debug& operator<<(Debug& debug, const MeshVisualizer3D::Flag value) {
         #endif
         #ifndef MAGNUM_TARGET_GLES2
         _c(InstancedObjectId)
+        _c(VertexId)
         #ifndef MAGNUM_TARGET_WEBGL
         _c(PrimitiveId)
         #endif
@@ -649,6 +656,7 @@ Debug& operator<<(Debug& debug, const MeshVisualizer2D::Flags value) {
         MeshVisualizer2D::Flag::NoGeometryShader,
         #ifndef MAGNUM_TARGET_GLES2
         MeshVisualizer2D::Flag::InstancedObjectId,
+        MeshVisualizer2D::Flag::VertexId,
         MeshVisualizer2D::Flag::PrimitiveIdFromVertexId, /* Superset of PrimitiveId */
         #ifndef MAGNUM_TARGET_WEBGL
         MeshVisualizer2D::Flag::PrimitiveId
@@ -670,6 +678,7 @@ Debug& operator<<(Debug& debug, const MeshVisualizer3D::Flags value) {
         #endif
         #ifndef MAGNUM_TARGET_GLES2
         MeshVisualizer3D::Flag::InstancedObjectId,
+        MeshVisualizer3D::Flag::VertexId,
         MeshVisualizer3D::Flag::PrimitiveIdFromVertexId, /* Superset of PrimitiveId */
         #ifndef MAGNUM_TARGET_WEBGL
         MeshVisualizer3D::Flag::PrimitiveId
diff --git a/src/Magnum/Shaders/MeshVisualizer.frag b/src/Magnum/Shaders/MeshVisualizer.frag
index 483d3ab58..0d301f1b1 100644
--- a/src/Magnum/Shaders/MeshVisualizer.frag
+++ b/src/Magnum/Shaders/MeshVisualizer.frag
@@ -44,7 +44,7 @@
 #extension GL_NV_shader_noperspective_interpolation: require
 #endif
 
-#if (defined(WIREFRAME_RENDERING) || defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)) && !defined(TBN_DIRECTION)
+#if (defined(WIREFRAME_RENDERING) || defined(INSTANCED_OBJECT_ID) || defined(VERTEX_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)) && !defined(TBN_DIRECTION)
 #ifdef EXPLICIT_UNIFORM_LOCATION
 layout(location = 1)
 #endif
@@ -95,12 +95,14 @@ uniform lowp float smoothness
     ;
 #endif
 
-#if defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
+#if defined(INSTANCED_OBJECT_ID) || defined(VERTEX_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
 #ifdef EXPLICIT_TEXTURE_LAYER
 layout(binding = 4)
 #endif
 uniform lowp sampler2D colorMapTexture;
+#endif
 
+#if defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
 #ifdef EXPLICIT_UNIFORM_LOCATION
 layout(location = 6)
 #endif
@@ -127,6 +129,9 @@ in lowp vec3 barycentric;
 #ifdef INSTANCED_OBJECT_ID
 flat in highp uint interpolatedInstanceObjectId;
 #endif
+#ifdef VERTEX_ID
+in highp float interpolatedMappedVertexId;
+#endif
 #ifdef PRIMITIVE_ID_FROM_VERTEX_ID
 flat in highp uint interpolatedPrimitiveId;
 #endif
@@ -144,21 +149,34 @@ out lowp vec4 fragmentColor;
 #endif
 
 void main() {
-    /* Map object/primitive ID to a color. Will be either combined with the
-       wireframe background color (if wireframe is enabled), ignored (if
+    /* Map object/vertex/primitive ID to a color. Will be either combined with
+       the wireframe background color (if wireframe is enabled), ignored (if
        rendering TBN direction) or used as-is if nothing else is enabled */
-    #if defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
-    lowp vec4 faceColor = texture(colorMapTexture, vec2(colorMapOffset + float(
-        #ifdef INSTANCED_OBJECT_ID
-        interpolatedInstanceObjectId
-        #elif defined(PRIMITIVE_ID)
-        gl_PrimitiveID
-        #elif defined(PRIMITIVE_ID_FROM_VERTEX_ID)
-        interpolatedPrimitiveId
+    #if defined(INSTANCED_OBJECT_ID) || defined(VERTEX_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
+    lowp vec4 faceColor = texture(colorMapTexture, vec2(
+        /* Object/primitive IDs are constant across the whole primitive so we
+           do the offset/scale mapping here */
+        #if defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
+        colorMapOffset + float(
+            #ifdef INSTANCED_OBJECT_ID
+            interpolatedInstanceObjectId
+            #elif defined(PRIMITIVE_ID)
+            gl_PrimitiveID
+            #elif defined(PRIMITIVE_ID_FROM_VERTEX_ID)
+            interpolatedPrimitiveId
+            #else
+            #error mosra messed up
+            #endif
+        )*colorMapScale
+
+        /* Vertex ID changes, so the offset/scale mapping was done already in
+           a VS/GS and we just pass the interpolated result to a texture */
+        #elif defined(VERTEX_ID)
+        interpolatedMappedVertexId
         #else
-        #error mosra messed up
+        #error mosra messed up, again
         #endif
-    )*colorMapScale, 0.0));
+        , 0.0));
     #endif
 
     /* 1. For wireframe the line is on the triangle edges, thus dist = 0 at
@@ -195,7 +213,7 @@ void main() {
     #else
     fragmentColor = backgroundColor;
     #endif
-    #if defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
+    #if defined(INSTANCED_OBJECT_ID) || defined(VERTEX_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
     fragmentColor *= faceColor;
     #endif
 
@@ -244,8 +262,8 @@ void main() {
     fragmentColor = mix(wireframeColor, fragmentColor, nearest);
     #endif
 
-    /* Object / Primitive ID visualization using a colormap */
-    #elif defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
+    /* Object / Vertex / Primitive ID visualization using a colormap */
+    #elif defined(INSTANCED_OBJECT_ID) || defined(VERTEX_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
     fragmentColor = color*faceColor;
 
     #else
diff --git a/src/Magnum/Shaders/MeshVisualizer.geom b/src/Magnum/Shaders/MeshVisualizer.geom
index 2bf1cd751..8c638e3cb 100644
--- a/src/Magnum/Shaders/MeshVisualizer.geom
+++ b/src/Magnum/Shaders/MeshVisualizer.geom
@@ -103,6 +103,10 @@ out lowp vec3 dist;
 flat in highp uint interpolatedVsInstanceObjectId[];
 flat out highp uint interpolatedInstanceObjectId;
 #endif
+#ifdef VERTEX_ID
+in highp float interpolatedVsMappedVertexId[];
+out highp float interpolatedMappedVertexId;
+#endif
 #ifdef PRIMITIVE_ID_FROM_VERTEX_ID
 flat in highp uint interpolatedVsPrimitiveId[];
 flat out highp uint interpolatedPrimitiveId;
@@ -180,7 +184,7 @@ void main() {
     gl_PrimitiveID = gl_PrimitiveIDIn;
     #endif
 
-    /* Screen position of each vertex */
+    /* Screen position of each vertex + TBN direction */
     vec2 p[3];
     #ifdef TANGENT_DIRECTION
     vec2 t[3];
@@ -216,7 +220,8 @@ void main() {
     const float area = abs(dot(vec2(-v[1].y, v[1].x), v[2]));
 
     /* If wireframe is enabled, add distance to opposite side to each vertex.
-       Otherwise make all distances the same to avoid any lines being drawn. */
+       Otherwise make all distances the same to avoid any lines being drawn.
+       Propagate also mapped vertex ID, since that changes per-vertex also. */
     for(int i = 0; i != 3; ++i) {
         dist = vec3(0.0, 0.0, 0.0);
         #ifdef WIREFRAME_RENDERING
@@ -224,6 +229,9 @@ void main() {
         #else
         dist = vec3(area/length(v[i]));
         #endif
+        #ifdef VERTEX_ID
+        interpolatedMappedVertexId = interpolatedVsMappedVertexId[i];
+        #endif
         #if defined(TANGENT_DIRECTION) || defined(BITANGENT_DIRECTION) || defined(NORMAL_DIRECTION)
         backgroundColor = color;
         lineColor = wireframeColor;
diff --git a/src/Magnum/Shaders/MeshVisualizer.h b/src/Magnum/Shaders/MeshVisualizer.h
index bd4cffad0..9c5393be0 100644
--- a/src/Magnum/Shaders/MeshVisualizer.h
+++ b/src/Magnum/Shaders/MeshVisualizer.h
@@ -51,8 +51,9 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizerBase: public GL::AbstractShaderProgram
             NoGeometryShader = 1 << 1,
             #ifndef MAGNUM_TARGET_GLES2
             InstancedObjectId = 1 << 2,
-            PrimitiveId = 1 << 3,
-            PrimitiveIdFromVertexId = (1 << 4)|PrimitiveId
+            VertexId = 1 << 3,
+            PrimitiveId = 1 << 4,
+            PrimitiveIdFromVertexId = (1 << 5)|PrimitiveId
             #endif
         };
         typedef Containers::EnumSet<FlagBase> FlagsBase;
@@ -189,16 +190,19 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer2D: public Implementation::MeshVisuali
             /** @copydoc MeshVisualizer3D::Flag::InstancedObjectId */
             InstancedObjectId = 1 << 2,
 
+            /** @copydoc MeshVisualizer3D::Flag::VertexId */
+            VertexId = 1 << 3,
+
             #ifndef MAGNUM_TARGET_WEBGL
             /** @copydoc MeshVisualizer3D::Flag::PrimitiveId */
-            PrimitiveId = 1 << 3,
+            PrimitiveId = 1 << 4,
             #endif
 
             /** @copydoc MeshVisualizer3D::Flag::PrimitiveIdFromVertexId */
             #ifndef MAGNUM_TARGET_WEBGL
-            PrimitiveIdFromVertexId = (1 << 4)|PrimitiveId
+            PrimitiveIdFromVertexId = (1 << 5)|PrimitiveId
             #else
-            PrimitiveIdFromVertexId = (1 << 4)|(1 << 3)
+            PrimitiveIdFromVertexId = (1 << 5)|(1 << 4)
             #endif
             #endif
         };
@@ -447,7 +451,7 @@ Rendering setup:
 
 @snippet MagnumShaders.cpp MeshVisualizer-usage-tbn2
 
-@section Shaders-MeshVisualizer-object-id Object and primitive ID visualization
+@section Shaders-MeshVisualizer-object-id Object, vertex and primitive ID visualization
 
 If the mesh contains a per-vertex (or instanced) @ref ObjectId, it can be
 visualized by enabling @ref Flag::InstancedObjectId. For the actual
@@ -458,14 +462,19 @@ the @f$ [0, 1] @f$ texture range. Various colormap presets are in the
 
 @snippet MagnumShaders.cpp MeshVisualizer-usage-object-id
 
-If you enable @ref Flag::PrimitiveId instead, the shader will use the color map
-to visualize the order in which primitives are drawn. That's useful for example
-to see how well is the mesh optimized for a post-transform vertex cache. This
-by default relies on the @glsl gl_PrimitiveID @ce GLSL builtin; with
-@ref Flag::PrimitiveIdFromVertexId it's emulated using @glsl gl_VertexID @ce,
-expecting you to draw a non-indexed triangle mesh. You can use
-@ref MeshTools::duplicate() (and potentially @ref MeshTools::generateIndices())
-to conveniently convert the mesh to a non-indexed @ref MeshPrimitive::Triangles.
+If you enable @ref Flag::VertexId, the shader will use the color map to
+visualize how are vertices shared among primitives. That's useful for
+inspecting mesh connectivity --- primitives sharing vertices will have a smooth
+color map transition while duplicated vertices will cause a sharp edge. This
+relies on the @glsl gl_VertexID @ce GLSL builtin.
+
+The @ref Flag::PrimitiveId then visualizes the order in which primitives are
+drawn. That's useful for example to see to see how well is the mesh optimized
+for a post-transform vertex cache. This by default relies on the @glsl gl_PrimitiveID @ce GLSL builtin; with @ref Flag::PrimitiveIdFromVertexId it's
+emulated using @glsl gl_VertexID @ce, expecting you to draw a non-indexed
+triangle mesh. You can use @ref MeshTools::duplicate() (and potentially
+@ref MeshTools::generateIndices()) to conveniently convert the mesh to a
+non-indexed @ref MeshPrimitive::Triangles.
 
 @requires_gl32 The `gl_PrimitiveID` shader variable is not available on OpenGL
     3.1 and lower.
@@ -606,7 +615,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
             /**
              * Visualize instanced object ID. You need to provide the
              * @ref ObjectId attribute in the mesh. Mutually exclusive with
-             * @ref Flag::PrimitiveId.
+             * @ref Flag::VertexId and @ref Flag::PrimitiveId.
              * @requires_gl30 Extension @gl_extension{EXT,gpu_shader4}
              * @requires_gles30 Object ID output requires integer support in
              *      shaders, which is not available in OpenGL ES 2.0 or WebGL
@@ -615,10 +624,27 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
              */
             InstancedObjectId = 1 << 2,
 
+            /**
+             * Visualize vertex ID (@cpp gl_VertexID @ce). Useful for
+             * visualizing mesh connectivity --- primitives sharing vertices
+             * will have a smooth color map transition while duplicated
+             * vertices will cause a sharp edge. Mutually exclusive with
+             * @ref Flag::InstancedObjectId and @ref Flag::PrimitiveId.
+             * @requires_gl30 The `gl_VertexID` shader variable is not
+             *      available on OpenGL 2.1.
+             * @requires_gles30 The `gl_VertexID` shader variable is not
+             *      available on OpenGL ES 2.0.
+             * @requires_webgl20 `gl_VertexID` is not available in WebGL 1.0.
+             * @m_since_latest
+             */
+            VertexId = 1 << 3,
+
             #ifndef MAGNUM_TARGET_WEBGL
             /**
-             * Visualize primitive ID (@cpp gl_PrimitiveID @ce). Mutually
-             * exclusive with @ref Flag::InstancedObjectId. See also
+             * Visualize primitive ID (@cpp gl_PrimitiveID @ce). Useful for
+             * visualizing how well is the mesh optimized for a post-transform
+             * vertex cache. Mutually exclusive with
+             * @ref Flag::InstancedObjectId and @ref Flag::VertexId. See also
              * @ref Flag::PrimitiveIdFromVertexId.
              * @requires_gl32 The `gl_PrimitiveID` shader variable is not
              *      available on OpenGL 3.1 and lower.
@@ -628,7 +654,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
              * @requires_gles `gl_PrimitiveID` is not available in WebGL.
              * @m_since_latest
              */
-            PrimitiveId = 1 << 3,
+            PrimitiveId = 1 << 4,
             #endif
 
             /**
@@ -646,9 +672,9 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
              * @m_since_latest
              */
             #ifndef MAGNUM_TARGET_WEBGL
-            PrimitiveIdFromVertexId = (1 << 4)|PrimitiveId,
+            PrimitiveIdFromVertexId = (1 << 5)|PrimitiveId,
             #else
-            PrimitiveIdFromVertexId = (1 << 4)|(1 << 3),
+            PrimitiveIdFromVertexId = (1 << 5)|(1 << 4),
             #endif
             #endif
 
@@ -666,7 +692,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
              * @requires_gles Geometry shaders are not available in WebGL.
              * @m_since_latest
              */
-            TangentDirection = 1 << 5,
+            TangentDirection = 1 << 6,
 
             /**
              * Visualize bitangent direction with green lines pointing out of
@@ -683,7 +709,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
              * @requires_gles Geometry shaders are not available in WebGL.
              * @m_since_latest
              */
-            BitangentFromTangentDirection = 1 << 6,
+            BitangentFromTangentDirection = 1 << 7,
 
             /**
              * Visualize bitangent direction with green lines pointing out of
@@ -700,7 +726,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
              * @requires_gles Geometry shaders are not available in WebGL.
              * @m_since_latest
              */
-            BitangentDirection = 1 << 7,
+            BitangentDirection = 1 << 8,
 
             /**
              * Visualize normal direction with blue lines pointing out of
@@ -714,7 +740,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizer3D: public Implementation::MeshVisuali
              * @requires_gles Geometry shaders are not available in WebGL.
              * @m_since_latest
              */
-            NormalDirection = 1 << 8
+            NormalDirection = 1 << 9
             #endif
         };
 
diff --git a/src/Magnum/Shaders/MeshVisualizer.vert b/src/Magnum/Shaders/MeshVisualizer.vert
index 4443dd8c7..6a4085e98 100644
--- a/src/Magnum/Shaders/MeshVisualizer.vert
+++ b/src/Magnum/Shaders/MeshVisualizer.vert
@@ -62,6 +62,19 @@ uniform highp mat4 projectionMatrix
 #error
 #endif
 
+#ifdef VERTEX_ID
+#ifdef EXPLICIT_UNIFORM_LOCATION
+layout(location = 6)
+#endif
+uniform lowp vec2 colorMapOffsetScale
+    #ifndef GL_ES
+    = vec2(1.0/512.0, 1.0/256.0)
+    #endif
+    ;
+#define colorMapOffset colorMapOffsetScale.x
+#define colorMapScale colorMapOffsetScale.y
+#endif
+
 #if defined(TANGENT_DIRECTION) || defined(BITANGENT_FROM_TANGENT_DIRECTION) || defined(BITANGENT_DIRECTION) || defined(NORMAL_DIRECTION)
 #ifdef EXPLICIT_UNIFORM_LOCATION
 layout(location = 8)
@@ -139,6 +152,14 @@ flat out highp uint interpolatedVsInstanceObjectId;
 #endif
 #endif
 
+#ifdef VERTEX_ID
+#ifdef NO_GEOMETRY_SHADER
+out highp float interpolatedMappedVertexId;
+#else
+out highp float interpolatedVsMappedVertexId;
+#endif
+#endif
+
 #ifdef PRIMITIVE_ID_FROM_VERTEX_ID
 #ifdef NO_GEOMETRY_SHADER
 flat out highp uint interpolatedPrimitiveId;
@@ -206,6 +227,14 @@ void main() {
     #endif
         = instanceObjectId;
     #endif
+    #ifdef VERTEX_ID
+    #ifdef NO_GEOMETRY_SHADER
+    interpolatedMappedVertexId
+    #else
+    interpolatedVsMappedVertexId
+    #endif
+        = colorMapOffset + float(gl_VertexID)*colorMapScale;
+    #endif
     #ifdef PRIMITIVE_ID_FROM_VERTEX_ID
     #ifdef NO_GEOMETRY_SHADER
     interpolatedPrimitiveId
diff --git a/src/Magnum/Shaders/Test/CMakeLists.txt b/src/Magnum/Shaders/Test/CMakeLists.txt
index a062724b2..d42a759fc 100644
--- a/src/Magnum/Shaders/Test/CMakeLists.txt
+++ b/src/Magnum/Shaders/Test/CMakeLists.txt
@@ -159,6 +159,8 @@ if(BUILD_GL_TESTS)
             MeshVisualizerTestFiles/defaults-primitiveid2D.tga
             MeshVisualizerTestFiles/defaults-primitiveid3D.tga
             MeshVisualizerTestFiles/defaults-tbn.tga
+            MeshVisualizerTestFiles/defaults-vertexid2D.tga
+            MeshVisualizerTestFiles/defaults-vertexid3D.tga
             MeshVisualizerTestFiles/defaults-wireframe2D.tga
             MeshVisualizerTestFiles/defaults-wireframe3D.tga
             MeshVisualizerTestFiles/objectid2D.tga
@@ -168,6 +170,8 @@ if(BUILD_GL_TESTS)
             MeshVisualizerTestFiles/primitiveid3D.tga
             MeshVisualizerTestFiles/tbn-wide.tga
             MeshVisualizerTestFiles/tbn.tga
+            MeshVisualizerTestFiles/vertexid2D.tga
+            MeshVisualizerTestFiles/vertexid3D.tga
             MeshVisualizerTestFiles/wireframe-nogeo2D.tga
             MeshVisualizerTestFiles/wireframe-nogeo3D.tga
             MeshVisualizerTestFiles/wireframe-nogeo-objectid2D.tga
@@ -175,6 +179,8 @@ if(BUILD_GL_TESTS)
             MeshVisualizerTestFiles/wireframe-perspective.tga
             MeshVisualizerTestFiles/wireframe-primitiveid-tn.tga
             MeshVisualizerTestFiles/wireframe-tn-smooth.tga
+            MeshVisualizerTestFiles/wireframe-vertexid2D.tga
+            MeshVisualizerTestFiles/wireframe-vertexid3D.tga
             MeshVisualizerTestFiles/wireframe-wide2D.tga
             MeshVisualizerTestFiles/wireframe-wide3D.tga
             MeshVisualizerTestFiles/wireframe2D.tga
diff --git a/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp b/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp
index c65c88e7b..1dfbcc486 100644
--- a/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp
+++ b/src/Magnum/Shaders/Test/MeshVisualizerGLTest.cpp
@@ -106,6 +106,8 @@ struct MeshVisualizerGLTest: GL::OpenGLTester {
     #ifndef MAGNUM_TARGET_GLES2
     void renderDefaultsObjectId2D();
     void renderDefaultsObjectId3D();
+    void renderDefaultsVertexId2D();
+    void renderDefaultsVertexId3D();
     void renderDefaultsPrimitiveId2D();
     void renderDefaultsPrimitiveId3D();
     #endif
@@ -115,8 +117,8 @@ struct MeshVisualizerGLTest: GL::OpenGLTester {
     void renderWireframe2D();
     void renderWireframe3D();
     #ifndef MAGNUM_TARGET_GLES2
-    void renderObjectPrimitiveId2D();
-    void renderObjectPrimitiveId3D();
+    void renderObjectVertexPrimitiveId2D();
+    void renderObjectVertexPrimitiveId3D();
     #endif
     #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
     void renderWireframe3DPerspective();
@@ -140,10 +142,11 @@ struct MeshVisualizerGLTest: GL::OpenGLTester {
 
     -   Mesa Intel
     -   Mesa AMD
+    .   Mesa llvmpipe
     -   SwiftShader ES2/ES3
     -   ARM Mali (Huawei P10) ES2/ES3 (except TBN visualization)
-    -   WebGL 1 / 2 (on Mesa Intel) (except primitive/object ID)
-    -   iPhone 6 w/ iOS 12.4 (except primitive/object ID)
+    -   WebGL 1 / 2 (on Mesa Intel) (except primitive/vertex/object ID)
+    -   iPhone 6 w/ iOS 12.4 (except primitive/vertex/object ID)
 */
 
 using namespace Math::Literals;
@@ -155,6 +158,7 @@ constexpr struct {
     {"wireframe w/o GS", MeshVisualizer2D::Flag::Wireframe|MeshVisualizer2D::Flag::NoGeometryShader},
     #ifndef MAGNUM_TARGET_GLES2
     {"object ID", MeshVisualizer2D::Flag::InstancedObjectId},
+    {"vertex ID", MeshVisualizer2D::Flag::VertexId},
     #ifndef MAGNUM_TARGET_WEBGL
     {"primitive ID", MeshVisualizer2D::Flag::PrimitiveId},
     #endif
@@ -169,6 +173,7 @@ constexpr struct {
     {"wireframe w/o GS", MeshVisualizer3D::Flag::Wireframe|MeshVisualizer3D::Flag::NoGeometryShader},
     #ifndef MAGNUM_TARGET_GLES2
     {"object ID", MeshVisualizer3D::Flag::InstancedObjectId},
+    {"vertex ID", MeshVisualizer3D::Flag::VertexId},
     #ifndef MAGNUM_TARGET_WEBGL
     {"primitive ID", MeshVisualizer3D::Flag::InstancedObjectId},
     #endif
@@ -188,8 +193,10 @@ constexpr struct {
     {"normal direction", MeshVisualizer3D::Flag::NormalDirection},
     {"tbn direction", MeshVisualizer3D::Flag::TangentDirection|MeshVisualizer3D::Flag::BitangentDirection|MeshVisualizer3D::Flag::NormalDirection},
     {"tbn direction with bitangent from tangent", MeshVisualizer3D::Flag::TangentDirection|MeshVisualizer3D::Flag::BitangentFromTangentDirection|MeshVisualizer3D::Flag::NormalDirection},
+    {"wireframe + vertex id", MeshVisualizer3D::Flag::Wireframe|MeshVisualizer3D::Flag::VertexId},
     {"wireframe + t/n direction", MeshVisualizer3D::Flag::Wireframe|MeshVisualizer3D::Flag::TangentDirection|MeshVisualizer3D::Flag::NormalDirection},
-    {"wireframe + object id + t/n direction", MeshVisualizer3D::Flag::Wireframe|MeshVisualizer3D::Flag::InstancedObjectId|MeshVisualizer3D::Flag::TangentDirection|MeshVisualizer3D::Flag::NormalDirection}
+    {"wireframe + object id + t/n direction", MeshVisualizer3D::Flag::Wireframe|MeshVisualizer3D::Flag::InstancedObjectId|MeshVisualizer3D::Flag::TangentDirection|MeshVisualizer3D::Flag::NormalDirection},
+    {"wireframe + vertex id + t/b direction", MeshVisualizer3D::Flag::Wireframe|MeshVisualizer3D::Flag::VertexId|MeshVisualizer3D::Flag::TangentDirection|MeshVisualizer3D::Flag::BitangentDirection}
 };
 #endif
 
@@ -209,7 +216,10 @@ constexpr struct {
     #ifndef MAGNUM_TARGET_GLES2
     {"both object and primitive id",
         MeshVisualizer2D::Flag::InstancedObjectId|MeshVisualizer2D::Flag::PrimitiveIdFromVertexId,
-        ": Flag::InstancedObjectId and Flag::PrimitiveId are mutually exclusive"}
+        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"},
+    {"both object and vertex id",
+        MeshVisualizer2D::Flag::InstancedObjectId|MeshVisualizer2D::Flag::VertexId,
+        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"}
     #endif
 };
 
@@ -229,7 +239,10 @@ constexpr struct {
     #ifndef MAGNUM_TARGET_GLES2
     {"both object and primitive id",
         MeshVisualizer3D::Flag::InstancedObjectId|MeshVisualizer3D::Flag::PrimitiveIdFromVertexId,
-        ": Flag::InstancedObjectId and Flag::PrimitiveId are mutually exclusive"}
+        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"},
+    {"both vertex and primitive id",
+        MeshVisualizer3D::Flag::VertexId|MeshVisualizer3D::Flag::PrimitiveIdFromVertexId,
+        ": Flag::InstancedObjectId, Flag::VertexId and Flag::PrimitiveId are mutually exclusive"}
     #endif
 };
 
@@ -293,11 +306,15 @@ constexpr struct {
     MeshVisualizer3D::Flags flags3D;
     const char* file2D;
     const char* file3D;
-} ObjectPrimitiveIdData[] {
+} ObjectVertexPrimitiveIdData[] {
     {"object ID",
         MeshVisualizer2D::Flag::InstancedObjectId,
         MeshVisualizer3D::Flag::InstancedObjectId,
         "objectid2D.tga", "objectid3D.tga"},
+    {"vertex ID",
+        MeshVisualizer2D::Flag::VertexId,
+        MeshVisualizer3D::Flag::VertexId,
+        "vertexid2D.tga", "vertexid3D.tga"},
     #ifndef MAGNUM_TARGET_WEBGL
     {"primitive ID",
         MeshVisualizer2D::Flag::PrimitiveId,
@@ -317,7 +334,11 @@ constexpr struct {
         MeshVisualizer2D::Flag::NoGeometryShader,
         MeshVisualizer3D::Flag::InstancedObjectId|MeshVisualizer3D::Flag::Wireframe|
         MeshVisualizer3D::Flag::NoGeometryShader,
-        "wireframe-nogeo-objectid2D.tga", "wireframe-nogeo-objectid3D.tga"}
+        "wireframe-nogeo-objectid2D.tga", "wireframe-nogeo-objectid3D.tga"},
+    {"wireframe + vertex ID",
+        MeshVisualizer2D::Flag::VertexId|MeshVisualizer2D::Flag::Wireframe,
+        MeshVisualizer3D::Flag::VertexId|MeshVisualizer3D::Flag::Wireframe,
+        "wireframe-vertexid2D.tga", "wireframe-vertexid3D.tga"}
 };
 #endif
 
@@ -438,6 +459,8 @@ MeshVisualizerGLTest::MeshVisualizerGLTest() {
 
     #ifndef MAGNUM_TARGET_GLES2
     addTests({
+        &MeshVisualizerGLTest::renderDefaultsVertexId2D,
+        &MeshVisualizerGLTest::renderDefaultsVertexId3D,
         &MeshVisualizerGLTest::renderDefaultsPrimitiveId2D,
         &MeshVisualizerGLTest::renderDefaultsPrimitiveId3D,
         #ifndef MAGNUM_TARGET_WEBGL
@@ -459,9 +482,9 @@ MeshVisualizerGLTest::MeshVisualizerGLTest() {
         &MeshVisualizerGLTest::renderTeardown);
 
     #ifndef MAGNUM_TARGET_GLES2
-    addInstancedTests({&MeshVisualizerGLTest::renderObjectPrimitiveId2D,
-                       &MeshVisualizerGLTest::renderObjectPrimitiveId3D},
-        Containers::arraySize(ObjectPrimitiveIdData),
+    addInstancedTests({&MeshVisualizerGLTest::renderObjectVertexPrimitiveId2D,
+                       &MeshVisualizerGLTest::renderObjectVertexPrimitiveId3D},
+        Containers::arraySize(ObjectVertexPrimitiveIdData),
         &MeshVisualizerGLTest::renderSetup,
         &MeshVisualizerGLTest::renderTeardown);
     #endif
@@ -778,7 +801,7 @@ void MeshVisualizerGLTest::setWireframeNotEnabled2D() {
 
     #ifndef MAGNUM_TARGET_GLES2
     CORRADE_COMPARE(out.str(),
-        "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe or object/primitive ID enabled\n");
+        "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe or object/vertex/primitive ID enabled\n");
     #else
     CORRADE_COMPARE(out.str(),
         "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe enabled\n");
@@ -813,7 +836,7 @@ void MeshVisualizerGLTest::setWireframeNotEnabled3D() {
 
     #ifndef MAGNUM_TARGET_GLES2
     CORRADE_COMPARE(out.str(),
-        "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe or object/primitive ID enabled\n");
+        "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe or object/vertex/primitive ID enabled\n");
     #else
     CORRADE_COMPARE(out.str(),
         "Shaders::MeshVisualizer::setColor(): the shader was not created with wireframe enabled\n");
@@ -846,8 +869,8 @@ void MeshVisualizerGLTest::setColorMapNotEnabled2D() {
         .bindColorMapTexture(texture);
 
     CORRADE_COMPARE(out.str(),
-        "Shaders::MeshVisualizer::setColorMapTransformation(): the shader was not created with object/primitive ID enabled\n"
-        "Shaders::MeshVisualizer::bindColorMapTexture(): the shader was not created with object/primitive ID enabled\n");
+        "Shaders::MeshVisualizer::setColorMapTransformation(): the shader was not created with object/vertex/primitive ID enabled\n"
+        "Shaders::MeshVisualizer::bindColorMapTexture(): the shader was not created with object/vertex/primitive ID enabled\n");
 }
 
 void MeshVisualizerGLTest::setColorMapNotEnabled3D() {
@@ -864,8 +887,8 @@ void MeshVisualizerGLTest::setColorMapNotEnabled3D() {
         .bindColorMapTexture(texture);
 
     CORRADE_COMPARE(out.str(),
-        "Shaders::MeshVisualizer::setColorMapTransformation(): the shader was not created with object/primitive ID enabled\n"
-        "Shaders::MeshVisualizer::bindColorMapTexture(): the shader was not created with object/primitive ID enabled\n");
+        "Shaders::MeshVisualizer::setColorMapTransformation(): the shader was not created with object/vertex/primitive ID enabled\n"
+        "Shaders::MeshVisualizer::bindColorMapTexture(): the shader was not created with object/vertex/primitive ID enabled\n");
 }
 #endif
 
@@ -1133,6 +1156,61 @@ void MeshVisualizerGLTest::renderDefaultsObjectId3D() {
         (DebugTools::CompareImageToFile{_manager, 150.67f, 0.165f}));
 }
 
+void MeshVisualizerGLTest::renderDefaultsVertexId2D() {
+    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
+       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
+        CORRADE_SKIP("AnyImageImporter / TgaImageImporter plugins not found.");
+
+    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
+    if(
+        #ifndef MAGNUM_TARGET_GLES
+        !GL::Context::current().isVersionSupported(GL::Version::GL300)
+        #else
+        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
+        #endif
+    ) CORRADE_SKIP("gl_VertexID not supported.");
+    #endif
+
+    MeshVisualizer2D{MeshVisualizer2D::Flag::VertexId}
+        .bindColorMapTexture(_colorMapTexture)
+        .draw(MeshTools::compile(Primitives::circle2DSolid(16)));
+
+    MAGNUM_VERIFY_NO_GL_ERROR();
+
+    CORRADE_COMPARE_WITH(
+        /* Dropping the alpha channel, as it's always 1.0 */
+        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
+        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-vertexid2D.tga"),
+        (DebugTools::CompareImageToFile{_manager, 1.0f, 0.017f}));
+}
+
+void MeshVisualizerGLTest::renderDefaultsVertexId3D() {
+    if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
+       !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
+        CORRADE_SKIP("AnyImageImporter / TgaImageImporter plugins not found.");
+
+    #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
+    if(
+        #ifndef MAGNUM_TARGET_GLES
+        !GL::Context::current().isVersionSupported(GL::Version::GL300)
+        #else
+        !GL::Context::current().isVersionSupported(GL::Version::GLES300)
+        #endif
+    ) CORRADE_SKIP("gl_VertexID not supported.");
+    #endif
+
+    MeshVisualizer2D{MeshVisualizer2D::Flag::VertexId}
+        .bindColorMapTexture(_colorMapTexture)
+        .draw(MeshTools::compile(Primitives::icosphereSolid(0)));
+
+    MAGNUM_VERIFY_NO_GL_ERROR();
+
+    CORRADE_COMPARE_WITH(
+        /* Dropping the alpha channel, as it's always 1.0 */
+        Containers::arrayCast<Color3ub>(_framebuffer.read(_framebuffer.viewport(), {PixelFormat::RGBA8Unorm}).pixels<Color4ub>()),
+        Utility::Directory::join(_testDir, "MeshVisualizerTestFiles/defaults-vertexid3D.tga"),
+        (DebugTools::CompareImageToFile{_manager, 1.0f, 0.012f}));
+}
 void MeshVisualizerGLTest::renderDefaultsPrimitiveId2D() {
     if(!(_manager.loadState("AnyImageImporter") & PluginManager::LoadState::Loaded) ||
        !(_manager.loadState("TgaImporter") & PluginManager::LoadState::Loaded))
@@ -1461,8 +1539,8 @@ void MeshVisualizerGLTest::renderWireframe3D() {
 }
 
 #ifndef MAGNUM_TARGET_GLES2
-void MeshVisualizerGLTest::renderObjectPrimitiveId2D() {
-    auto&& data = ObjectPrimitiveIdData[testCaseInstanceId()];
+void MeshVisualizerGLTest::renderObjectVertexPrimitiveId2D() {
+    auto&& data = ObjectVertexPrimitiveIdData[testCaseInstanceId()];
     setTestCaseDescription(data.name);
 
     #ifndef MAGNUM_TARGET_GLES
@@ -1519,15 +1597,23 @@ void MeshVisualizerGLTest::renderObjectPrimitiveId2D() {
         /* Shouldn't assert (nor warn) when wireframe is not enabled */
         .setViewportSize({80, 80})
         .setTransformationProjectionMatrix(Matrix3::projection({2.1f, 2.1f}))
-        /* Should cover the first half of the colormap, in reverse order; for
-           primitive ID the whole colormap due to the repeat wrapping */
-        .setColorMapTransformation(0.5f, -1.0f/16.0f)
         .bindColorMapTexture(_colorMapTexture);
 
     /* OTOH the wireframe color should stay at full channels, not mixed */
     if(data.flags3D & MeshVisualizer3D::Flag::Wireframe)
         shader.setWireframeColor(0xffffff_rgbf);
 
+    /* For vertex ID we don't want any repeat/wraparound as that causes
+       disruptions in the gradient and test failures. There's 17 vertices
+       also. */
+    if(data.flags2D & MeshVisualizer2D::Flag::VertexId)
+        shader.setColorMapTransformation(1.0f, -1.0f/17.0f);
+    /* For object/primitive ID there's no gradient so a wraparound is okay.
+       This should cover the first half of the colormap, in reverse order; for
+       primitive ID the whole colormap due to the repeat wrapping */
+    else
+        shader.setColorMapTransformation(0.5f, -1.0f/16.0f);
+
     shader.draw(circle);
 
     MAGNUM_VERIFY_NO_GL_ERROR();
@@ -1545,8 +1631,8 @@ void MeshVisualizerGLTest::renderObjectPrimitiveId2D() {
         (DebugTools::CompareImageToFile{_manager, 4.0f, 0.141f}));
 }
 
-void MeshVisualizerGLTest::renderObjectPrimitiveId3D() {
-    auto&& data = ObjectPrimitiveIdData[testCaseInstanceId()];
+void MeshVisualizerGLTest::renderObjectVertexPrimitiveId3D() {
+    auto&& data = ObjectVertexPrimitiveIdData[testCaseInstanceId()];
     setTestCaseDescription(data.name);
 
     #ifndef MAGNUM_TARGET_GLES
@@ -1605,15 +1691,22 @@ void MeshVisualizerGLTest::renderObjectPrimitiveId3D() {
             Matrix4::rotationY(-15.0_degf)*
             Matrix4::rotationX(15.0_degf))
         .setProjectionMatrix(Matrix4::perspectiveProjection(60.0_degf, 1.0f, 0.1f, 10.0f))
-        /* Should cover the first half of the colormap, in reverse order; for
-           primitive ID the whole colormap due to the repeat wrapping */
-        .setColorMapTransformation(0.5f, -1.0f/40.0f)
         .bindColorMapTexture(_colorMapTexture);
 
     /* OTOH the wireframe color should stay at full channels, not mixed */
     if(data.flags2D & MeshVisualizer2D::Flag::Wireframe)
         shader.setWireframeColor(0xffffff_rgbf);
 
+    /* For vertex ID we don't want any repeat/wraparound as that causes
+       disruptions in the gradient and test failures. There's 42 vertices also. */
+    if(data.flags2D & MeshVisualizer2D::Flag::VertexId)
+        shader.setColorMapTransformation(1.0f, -1.0f/42.0f);
+    /* For object/primitive ID there's no gradient so a wraparound is okay.
+       This should cover the first half of the colormap, in reverse order; for
+       primitive ID the whole colormap due to the repeat wrapping */
+    else
+        shader.setColorMapTransformation(0.5f, -1.0f/40.0f);
+
     shader.draw(circle);
 
     MAGNUM_VERIFY_NO_GL_ERROR();
diff --git a/src/Magnum/Shaders/Test/MeshVisualizerTestFiles/defaults-vertexid2D.tga b/src/Magnum/Shaders/Test/MeshVisualizerTestFiles/defaults-vertexid2D.tga
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diff --git a/src/Magnum/Shaders/Test/MeshVisualizerTestFiles/wireframe-vertexid3D.tga b/src/Magnum/Shaders/Test/MeshVisualizerTestFiles/wireframe-vertexid3D.tga
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