[PATCH 1/5] wined3d: Ignore WINED3D_MAP_DISCARD when used together with WINED3D_MAP_NOOVERWRITE.

[Henri Verbeet]

This fixes a performance issue exposed by commit
afb2aa2512d4c5ffa7256ce5137bc2c142a5d065.

Signed-off-by: Henri Verbeet 
---
 dlls/wined3d/resource.c | 22 ++++++++++++----------
 1 file changed, 12 insertions(+), 10 deletions(-)

diff --git a/dlls/wined3d/resource.c b/dlls/wined3d/resource.c
index 40890cc99e8..dcaa0727075 100644
--- a/dlls/wined3d/resource.c
+++ b/dlls/wined3d/resource.c
@@ -335,17 +335,19 @@ static DWORD wined3d_resource_sanitise_map_flags(const struct wined3d_resource *
             return 0;
         }
     }
-    else if ((flags & (WINED3D_MAP_DISCARD | WINED3D_MAP_NOOVERWRITE))
-            == (WINED3D_MAP_DISCARD | WINED3D_MAP_NOOVERWRITE))
+    else if (flags & (WINED3D_MAP_DISCARD | WINED3D_MAP_NOOVERWRITE))
     {
-        WARN("WINED3D_MAP_DISCARD and WINED3D_MAP_NOOVERWRITE used together, ignoring.\n");
-        return 0;
-    }
-    else if (flags & (WINED3D_MAP_DISCARD | WINED3D_MAP_NOOVERWRITE)
-            && !(resource->usage & WINED3DUSAGE_DYNAMIC))
-    {
-        WARN("DISCARD or NOOVERWRITE map on non-dynamic buffer, ignoring.\n");
-        return 0;
+        if (!(resource->usage & WINED3DUSAGE_DYNAMIC))
+        {
+            WARN("DISCARD or NOOVERWRITE map on non-dynamic buffer, ignoring.\n");
+            return 0;
+        }
+        if ((flags & (WINED3D_MAP_DISCARD | WINED3D_MAP_NOOVERWRITE))
+                == (WINED3D_MAP_DISCARD | WINED3D_MAP_NOOVERWRITE))
+        {
+            WARN("WINED3D_MAP_NOOVERWRITE used with WINED3D_MAP_DISCARD, ignoring WINED3D_MAP_DISCARD.\n");
+            flags &= ~WINED3D_MAP_DISCARD;
+        }
     }

return flags;