[PATCH 1/3] wined3d: Call prepare_upload_bo in wined3d_device_context_emit_map() only for DISCARD or NOOVERWRITE maps.

[Zebediah Figura]

We can't do an asynchronous upload with just WINED3D_MAP_WRITE, but we can with
update_sub_resource, and prepare_upload_bo doesn't know which it was called
from.

Signed-off-by: Zebediah Figura 
---
 dlls/wined3d/cs.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/wined3d/cs.c b/dlls/wined3d/cs.c
index 1cbbc43399a..376ee1a6c7e 100644
--- a/dlls/wined3d/cs.c
+++ b/dlls/wined3d/cs.c
@@ -2465,7 +2465,8 @@ HRESULT wined3d_device_context_emit_map(struct wined3d_device_context *context,

wined3d_resource_get_sub_resource_map_pitch(resource, sub_resource_idx, &row_pitch, &slice_pitch);

-    if ((*map_ptr = context->ops->prepare_upload_bo(context, resource,
+    if ((flags & (WINED3D_MAP_DISCARD | WINED3D_MAP_NOOVERWRITE))
+            && (*map_ptr = context->ops->prepare_upload_bo(context, resource,
             sub_resource_idx, box, row_pitch, slice_pitch, flags, &addr)))
     {
         TRACE("Returning upload bo %s, map pointer %p, row pitch %u, slice pitch %u.\n",