Warn when nonexistent vertex attribute is requested

Author: slipher

src/engine/renderer/tr_backend.cpp

@@ -714,6 +714,12 @@ void GL_VertexAttribPointers( uint32_t attribBits )
 				frame = glState.vertexAttribsOldFrame;
 			}
 
+			if ( !( glState.currentVBO->attribBits & bit ) )
+			{
+				Log::Warn( "GL_VertexAttribPointers: %s does not have %s",
+				           glState.currentVBO->name, attributeNames[ i ] );
+			}
+
 			glVertexAttribPointer( i, layout->numComponents, layout->componentType, layout->normalize, layout->stride, BUFFER_OFFSET( layout->ofs + ( frame * layout->frameOffset + base ) ) );
 			glState.vertexAttribPointersSet |= bit;
 		}

src/engine/renderer/tr_local.h

@@ -697,14 +697,6 @@ enum class dynamicLightRenderer_t { LEGACY, TILED };
 	  ATTR_QTANGENT2      = BIT( ATTR_INDEX_QTANGENT2 ),
 
 	  ATTR_INTERP_BITS = ATTR_POSITION2 | ATTR_QTANGENT2,
-
-	  ATTR_BITS = ATTR_POSITION |
-	              ATTR_TEXCOORD |
-	              ATTR_QTANGENT |
-	              ATTR_COLOR // |
-
-	              //ATTR_BONE_INDEXES |
-	              //ATTR_BONE_WEIGHTS
 	};
 
 	struct vboAttributeLayout_t
@@ -754,7 +746,7 @@ enum class dynamicLightRenderer_t { LEGACY, TILED };
 		vboAttributeLayout_t attribs[ ATTR_INDEX_MAX ]; // info for buffer manipulation
 
 		vboLayout_t layout;
-		uint32_t attribBits;
+		uint32_t attribBits; // Which attributes it has. Mostly for detecting errors
 		GLenum      usage;
 	};
 

src/engine/renderer/tr_model_md3.cpp

@@ -345,6 +345,10 @@ bool R_LoadMD3( model_t *mod, int lod, const void *buffer, const char *modName )
 			vboSurf->numVerts = surf->numVerts;
 
 			vboSurf->vbo = R_CreateStaticVBO( va( "staticMD3Mesh_VBO '%s'", surf->name ), data, vboLayout_t::VBO_LAYOUT_VERTEX_ANIMATION );
+
+			// MD3 does not have color, but shaders always request it and the "vertex animation"
+			// vertex layout includes a color field, which is zeroed by default.
+			vboSurf->vbo->attribBits |= ATTR_COLOR;
 
 			ri.Hunk_FreeTempMemory( data.st );
 			ri.Hunk_FreeTempMemory( data.qtangent );

src/engine/renderer/tr_model_skel.cpp

@@ -182,6 +182,10 @@ void R_AddSurfaceToVBOSurfacesList(
 
 	vboSurf->ibo = R_CreateStaticIBO( va( "staticMD5Mesh_IBO %i", ( int )vboSurfaces.size() ), indexes, indexesNum );
 
+	// MD5 does not have color, but shaders always request it and the skeletal animation
+	// vertex layout includes a color field, which is zeroed by default.
+	vboSurf->vbo->attribBits |= ATTR_COLOR;
+
 	ri.Hunk_FreeTempMemory( indexes );
 	ri.Hunk_FreeTempMemory( data.st );
 	ri.Hunk_FreeTempMemory( data.boneWeights );

src/engine/renderer/tr_vbo.cpp

@@ -1036,7 +1036,9 @@ R_InitVBOs
 */
 void R_InitVBOs()
 {
-	uint32_t attribs = ATTR_POSITION | ATTR_TEXCOORD | ATTR_QTANGENT | ATTR_COLOR;
+	// ATTR_QTANGENT and ATTR_ORIENTATION are mutually exclusive, but we don't know in advance
+	// which attributes will be used as this buffer is used for many purposes.
+	uint32_t attribs = ATTR_POSITION | ATTR_TEXCOORD | ATTR_QTANGENT | ATTR_ORIENTATION | ATTR_COLOR;
 
 	Log::Debug("------- R_InitVBOs -------" );