diff --git a/dlls/ddraw/d3ddevice/mesa.c b/dlls/ddraw/d3ddevice/mesa.c
index f92ebac9865..1bb90c19ddf 100644
--- a/dlls/ddraw/d3ddevice/mesa.c
+++ b/dlls/ddraw/d3ddevice/mesa.c
@@ -1356,13 +1356,15 @@ static void draw_primitive_strided(IDirect3DDeviceImpl *This,
        for now to some 'special' cases where we can do a direct mapping between D3D
        types and GL types.
 
-       Note that in the future all calls will go through vertex arrays but the arrays
-       will be generated by this function. */
+       Note: in the future all calls will go through vertex arrays but the arrays
+             will be generated by this function.
+
+       Note2: colours cannot be mapped directly because they are stored as BGRA in memory
+              (ie not as an array of R, G, B, A as OpenGL does it but as a LWORD 0xAARRGGBB
+	      which, as we are little indian, gives a B, G, R, A storage in memory.
+    */
     if (((d3dvtVertexType & D3DFVF_POSITION_MASK) == D3DFVF_XYZ) && /* Standard XYZ vertices */
-	(((d3dvtVertexType & (D3DFVF_DIFFUSE|D3DFVF_SPECULAR)) == 0) || /* Either no colours */
-	 (((d3dvtVertexType & D3DFVF_DIFFUSE) != 0) && /* Or diffuse only but the Alpha component is not used */
-	  (This->state_block.render_state[D3DRENDERSTATE_ALPHATESTENABLE - 1] == FALSE) &&
-	  (This->state_block.render_state[D3DRENDERSTATE_ALPHABLENDENABLE - 1] == FALSE)))) {
+	((d3dvtVertexType & (D3DFVF_DIFFUSE|D3DFVF_SPECULAR)) == 0)) {
 	int tex_stage;
 	TRACE(" using GL vertex arrays for performance !\n");
 	/* First, the vertices (we are sure we have some :-) */