Shaders: reassign MeshVisualizer uniforms to be contiguous for UBOs too.

src/Magnum/Shaders/MeshVisualizer.frag

@@ -100,7 +100,7 @@ uniform lowp float smoothness
 
 #if defined(INSTANCED_OBJECT_ID) || defined(PRIMITIVE_ID) || defined(PRIMITIVE_ID_FROM_VERTEX_ID)
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 6)
+layout(location = 5)
 #endif
 uniform lowp vec2 colorMapOffsetScale
     #ifndef GL_ES
@@ -115,7 +115,7 @@ uniform lowp vec2 colorMapOffsetScale
 
 #else
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 0)
+layout(location = 1)
 #endif
 uniform highp uint drawOffset
     #ifndef GL_ES

src/Magnum/Shaders/MeshVisualizer.geom

@@ -39,7 +39,7 @@
 /* This one is for both classic and UBOs, as it's usually set globally instead
    of changing per-draw */
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 5)
+layout(location = 0)
 #endif
 uniform lowp vec2 viewportSize; /* defaults to zero */
 
@@ -88,7 +88,7 @@ uniform lowp float smoothness
 
 #else
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 0)
+layout(location = 1)
 #endif
 uniform highp uint drawOffset
     #ifndef GL_ES

src/Magnum/Shaders/MeshVisualizer.vert

@@ -41,7 +41,7 @@
 #ifndef UNIFORM_BUFFERS
 #ifdef TWO_DIMENSIONS
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 0)
+layout(location = 6)
 #endif
 uniform highp mat3 transformationProjectionMatrix
     #ifndef GL_ES
@@ -50,7 +50,7 @@ uniform highp mat3 transformationProjectionMatrix
     ;
 #elif defined(THREE_DIMENSIONS)
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 0)
+layout(location = 6)
 #endif
 uniform highp mat4 transformationMatrix
     #ifndef GL_ES
@@ -71,7 +71,7 @@ uniform highp mat4 projectionMatrix
 
 #ifdef VERTEX_ID
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 6)
+layout(location = 5)
 #endif
 uniform lowp vec2 colorMapOffsetScale
     #ifndef GL_ES
@@ -106,7 +106,7 @@ uniform highp float lineLength
 
 #else
 #ifdef EXPLICIT_UNIFORM_LOCATION
-layout(location = 0)
+layout(location = 1)
 #endif
 uniform highp uint drawOffset
     #ifndef GL_ES

src/Magnum/Shaders/MeshVisualizerGL.h

@@ -97,16 +97,16 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizerGLBase: public GL::AbstractShaderProgr
         #ifndef MAGNUM_TARGET_GLES2
         UnsignedInt _materialCount{}, _drawCount{};
         #endif
-        Int _colorUniform{1},
+        Int _viewportSizeUniform{0},
+            _colorUniform{1},
             _wireframeColorUniform{2},
             _wireframeWidthUniform{3},
-            _smoothnessUniform{4},
+            _smoothnessUniform{4};
-            _viewportSizeUniform{5};
         #ifndef MAGNUM_TARGET_GLES2
-        Int _colorMapOffsetScaleUniform{6};
+        Int _colorMapOffsetScaleUniform{5};
-        /* Used instead of all other uniforms when Flag::UniformBuffers is set,
+        /* Used instead of all other uniforms except viewportSize when
-           so it can alias them */
+           Flag::UniformBuffers is set, so it can alias them */
-        Int _drawOffsetUniform{0};
+        Int _drawOffsetUniform{1};
         #endif
 };
 
@@ -565,7 +565,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizerGL2D: public Implementation::MeshVisua
          */
 
     private:
-        Int _transformationProjectionMatrixUniform{0};
+        Int _transformationProjectionMatrixUniform{6};
 };
 
 /**
@@ -1514,7 +1514,7 @@ class MAGNUM_SHADERS_EXPORT MeshVisualizerGL3D: public Implementation::MeshVisua
          */
 
     private:
-        Int _transformationMatrixUniform{0},
+        Int _transformationMatrixUniform{6},
             _projectionMatrixUniform{7};
         #if !defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
         Int _normalMatrixUniform{8},