Fixed Mesh:setDrawRange when the Mesh has a vertex map and the first argument to setDrawRange is non-zero. Removed mesh-specific instancing code.

src/modules/graphics/opengl/Mesh.h

@@ -119,15 +119,6 @@ public:
 	 **/
 	size_t getVertexMapCount() const;
 
-	/**
-	 * Sets the number of instances of this Mesh to draw (uses hardware
-	 * instancing when possible.)
-	 * A custom vertex shader is necessary in order to introduce differences
-	 * in each instance.
-	 **/
-	void setInstanceCount(int count);
-	int getInstanceCount() const;
-
 	/**
 	 * Sets the texture used when drawing the Mesh.
 	 **/
@@ -171,6 +162,7 @@ private:
 
 	GLenum getGLDrawMode(DrawMode mode) const;
 	GLenum getGLDataTypeFromMax(size_t maxvalue) const;
+	size_t getGLDataTypeSize(GLenum datatype) const;
 
 	// Vertex buffer.
 	VertexBuffer *vbo;
@@ -181,8 +173,6 @@ private:
 	size_t element_count;
 	GLenum element_data_type;
 
-	int instance_count;
-
 	DrawMode draw_mode;
 
 	int range_min;