d3drm: Implement IDirect3DRMMeshImpl_SetGroupColorRGB.

dlls/d3drm/meshbuilder.c

@@ -2742,9 +2742,16 @@ static HRESULT WINAPI IDirect3DRMMeshImpl_SetGroupColorRGB(IDirect3DRMMesh* ifac
 {
     IDirect3DRMMeshImpl *This = impl_from_IDirect3DRMMesh(iface);
 
-    FIXME("(%p)->(%u,%f,%f,%f): stub\n", This, id, red, green, blue);
+    TRACE("(%p)->(%u,%f,%f,%f)\n", This, id, red, green, blue);
 
-    return E_NOTIMPL;
+    if (id >= This->nb_groups)
+        return D3DRMERR_BADVALUE;
+
+    This->groups[id].color = D3DCOLOR_ARGB(0xff, (BYTE)(red   * 255.0f),
+                                                 (BYTE)(green * 255.0f),
+                                                 (BYTE)(blue  * 255.0f));
+
+    return D3DRM_OK;
 }
 
 static HRESULT WINAPI IDirect3DRMMeshImpl_SetGroupMapping(IDirect3DRMMesh* iface,