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-rw-r--r--src/gallium/state_trackers/nine/buffer9.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/gallium/state_trackers/nine/buffer9.c b/src/gallium/state_trackers/nine/buffer9.c
index 726408aed89..e497222434b 100644
--- a/src/gallium/state_trackers/nine/buffer9.c
+++ b/src/gallium/state_trackers/nine/buffer9.c
@@ -225,7 +225,11 @@ NineBuffer9_Lock( struct NineBuffer9 *This,
* D3DERR_WASSTILLDRAWING if the resource is in use, except for DYNAMIC.
* Our tests: some apps do use both DISCARD and NOOVERWRITE at the same
* time. On windows it seems to return different pointer, thus indicating
- * DISCARD is taken into account. */
+ * DISCARD is taken into account.
+ * Our tests: SYSTEMMEM doesn't DISCARD */
+
+ if (This->base.pool == D3DPOOL_SYSTEMMEM)
+ Flags &= ~D3DLOCK_DISCARD;
if (Flags & D3DLOCK_DISCARD)
usage = PIPE_TRANSFER_WRITE | PIPE_TRANSFER_DISCARD_WHOLE_RESOURCE;