[PATCH v2 1/3] d3d8: Pass NOOVERWRITE to redundantly discarded maps.

[Zebediah Figura]

From: Zebediah Figura

If DISCARD maps are accelerated, passing empty map flags won't return the same accelerated BO.

Tested with Port Royale 2 and Rayman 3.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=55770
---
 dlls/d3d8/buffer.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/dlls/d3d8/buffer.c b/dlls/d3d8/buffer.c
index 866292e43c0..f49f6f9f847 100644
--- a/dlls/d3d8/buffer.c
+++ b/dlls/d3d8/buffer.c
@@ -193,7 +193,10 @@ static HRESULT WINAPI d3d8_vertexbuffer_Lock(IDirect3DVertexBuffer8 *iface, UINT
             iface, offset, size, data, flags);

if (buffer->discarded)
-        flags &= ~D3DLOCK_DISCARD;
+    {
+        WARN("Filtering out redundant discard of %p.\n", buffer);
+        flags = (flags & ~D3DLOCK_DISCARD) | D3DLOCK_NOOVERWRITE;
+    }
     if (flags & D3DLOCK_DISCARD)
         buffer->discarded = true;

@@ -514,7 +517,10 @@ static HRESULT WINAPI d3d8_indexbuffer_Lock(IDirect3DIndexBuffer8 *iface, UINT o
             iface, offset, size, data, flags);

if (buffer->discarded)
-        flags &= ~D3DLOCK_DISCARD;
+    {
+        WARN("Filtering out redundant discard of %p.\n", buffer);
+        flags = (flags & ~D3DLOCK_DISCARD) | D3DLOCK_NOOVERWRITE;
+    }
     if (flags & D3DLOCK_DISCARD)
         buffer->discarded = true;