[D3D] Fix vertex array decision test.

[Lionel Ulmer]

Changelog:
 - limit usage of vertex arrays to correct states

-- 
		 Lionel Ulmer - http://www.bbrox.org/
-------------- next part --------------
--- dlls/ddraw_CVS/d3ddevice/mesa.c	Sun Nov 23 19:42:57 2003
+++ dlls/ddraw/d3ddevice/mesa.c	Sat Dec  6 14:18:37 2003
@@ -1356,13 +1356,15 @@
        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 :-) */