d3dx9: Don't pass the D3DLOCK_DISCARD flag when mapping a texture.

We aren't necessarily rewriting the whole surface (e.g. rect smaller than the whole surface, color key). Signed-off-by: Matteo Bruni <mbruni@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

d3dx9: Don't pass the D3DLOCK_DISCARD flag when mapping a texture.
536fce7f · Matteo Bruni · Alexandre Julliard · a838e144 · 536fce7f
Commit 536fce7f authored Sep 27, 2019 by Matteo Bruni Committed by Alexandre Julliard Sep 27, 2019
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surface.c dlls/d3dx9_36/surface.c +1 -1

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--- a/dlls/d3dx9_36/surface.c
+++ b/dlls/d3dx9_36/surface.c
@@ -209,7 +209,7 @@ HRESULT lock_surface(IDirect3DSurface9 *surface, const RECT *surface_rect, D3DLO
    DWORD lock_flag;
    HRESULT hr;
-    lock_flag = write ? D3DLOCK_DISCARD : D3DLOCK_READONLY;
+    lock_flag = write ? 0 : D3DLOCK_READONLY;
    *temp_surface = NULL;
    if (FAILED(hr = IDirect3DSurface9_LockRect(surface, lock, surface_rect, lock_flag)))
    {