Shaders: 3D version of VertexColorShader.

Fragment shader can be shared for 2D and 3D version, modified the
sources accordingly.

src/Shaders/CMakeLists.txt

@@ -2,7 +2,7 @@ corrade_add_resource(MagnumShaders_RCS MagnumShaders
     FlatShader2D.vert FlatShader2D.frag
     PhongShader.vert PhongShader.frag
     TextShader2D.vert TextShader2D.frag
-    VertexColorShader2D.vert VertexColorShader2D.frag
+    VertexColorShader2D.vert VertexColorShader3D.vert VertexColorShader.frag
     compatibility.glsl)
 set(MagnumShaders_SRCS
     FlatShader.cpp

src/Shaders/VertexColorShader.cpp

@@ -23,17 +23,9 @@
 namespace Magnum { namespace Shaders {
 
 namespace {
-    template<std::uint8_t dimensions> struct ShaderName {};
-
-    template<> struct ShaderName<2> {
-        constexpr static const char* vertex() { return "VertexColorShader2D.vert"; }
-        constexpr static const char* fragment() { return "VertexColorShader2D.frag"; }
-    };
-
-    template<> struct ShaderName<3> {
-        constexpr static const char* vertex() { return "VertexColorShader3D.vert"; }
-        constexpr static const char* fragment() { return "VertexColorShader3D.frag"; }
-    };
+    template<std::uint8_t> constexpr const char* vertexShaderName();
+    template<> constexpr const char* vertexShaderName<2>() { return "VertexColorShader2D.vert"; }
+    template<> constexpr const char* vertexShaderName<3>() { return "VertexColorShader3D.vert"; }
 }
 
 template<std::uint8_t dimensions> VertexColorShader<dimensions>::VertexColorShader(): transformationProjectionMatrixUniform(0) {
@@ -47,12 +39,12 @@ template<std::uint8_t dimensions> VertexColorShader<dimensions>::VertexColorShad
 
     Shader vertexShader(v, Shader::Type::Vertex);
     vertexShader.addSource(rs.get("compatibility.glsl"));
-    vertexShader.addSource(rs.get(ShaderName<dimensions>::vertex()));
+    vertexShader.addSource(rs.get(vertexShaderName<dimensions>()));
     attachShader(vertexShader);
 
     Shader fragmentShader(v, Shader::Type::Fragment);
     fragmentShader.addSource(rs.get("compatibility.glsl"));
-    fragmentShader.addSource(rs.get(ShaderName<dimensions>::fragment()));
+    fragmentShader.addSource(rs.get("VertexColorShader.frag"));
     attachShader(fragmentShader);
 
     #ifndef MAGNUM_TARGET_GLES

src/Shaders/VertexColorShader3D.vert

@@ -0,0 +1,25 @@
+#ifndef NEW_GLSL
+#define in attribute
+#define out varying
+#endif
+
+#ifdef EXPLICIT_UNIFORM_LOCATION
+layout(location = 0) uniform mat4 transformationProjectionMatrix;
+#else
+uniform highp mat4 transformationProjectionMatrix;
+#endif
+
+#ifdef EXPLICIT_ATTRIB_LOCATION
+layout(location = 0) in highp vec4 position;
+layout(location = 1) in lowp vec3 color;
+#else
+in highp vec4 position;
+in lowp vec3 color;
+#endif
+
+out lowp vec3 interpolatedColor;
+
+void main() {
+    gl_Position = transformationProjectionMatrix*position;
+    interpolatedColor = color;
+}