Stefan Dösinger : wined3d: Check the writemask before activating the oC0 optimization.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 068915a4f128985b0092bd0874f34cf9c88260b1
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=068915a4f128985b0092bd0874f34cf9c88260b1

Author: Stefan Dösinger <stefan at codeweavers.com>
Date:   Tue Jul 20 21:29:54 2010 +0200

wined3d: Check the writemask before activating the oC0 optimization.

The comment above the code correctly mentions that this optimization
does not work if oC0 is written partially, but the code doesn't
actually check for this condition.

---

 dlls/wined3d/shader.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/dlls/wined3d/shader.c b/dlls/wined3d/shader.c
index 66a81fb..209bae4 100644
--- a/dlls/wined3d/shader.c
+++ b/dlls/wined3d/shader.c
@@ -661,7 +661,8 @@ static HRESULT shader_get_registers_used(IWineD3DBaseShader *iface, const struct
                      * COLOROUT 0 is overwritten partially later, the marker is dropped again. */
 
                         ps->color0_mov = FALSE;
-                        if (ins.handler_idx == WINED3DSIH_MOV)
+                        if (ins.handler_idx == WINED3DSIH_MOV
+                                && dst_param.write_mask == WINED3DSP_WRITEMASK_ALL)
                         {
                             /* Used later when the source register is read. */
                             color0_mov = TRUE;