wined3d: Get rid of gl buffer variable in BltOverride.

dlls/wined3d/surface.c

@@ -3368,7 +3368,6 @@ static HRESULT IWineD3DSurfaceImpl_BltOverride(IWineD3DSurfaceImpl *This, RECT *
         WINEDDCOLORKEY oldBltCKey = Src->SrcBltCKey;
         RECT SourceRectangle;
         BOOL paletteOverride = FALSE;
-        GLenum buffer;
 
         TRACE("Blt from surface %p to rendertarget %p\n", Src, This);
 
@@ -3442,29 +3441,16 @@ static HRESULT IWineD3DSurfaceImpl_BltOverride(IWineD3DSurfaceImpl *This, RECT *
         /* Activate the destination context, set it up for blitting */
         ActivateContext(myDevice, (IWineD3DSurface *) This, CTXUSAGE_BLIT);
 
-        if(!dstSwapchain) {
-            TRACE("Drawing to offscreen buffer\n");
-            buffer = myDevice->offscreenBuffer;
-        } else {
-            buffer = surface_get_gl_buffer((IWineD3DSurface *)This, (IWineD3DSwapChain *)dstSwapchain);
-
-            /* Front buffer coordinates are screen coordinates, while OpenGL coordinates are
-             * window relative. Also beware of the origin difference(top left vs bottom left).
-             * Also beware that the front buffer's surface size is screen width x screen height,
-             * whereas the real gl drawable size is the size of the window.
-             */
-            if(buffer == GL_FRONT) {
-                RECT windowsize;
-                POINT offset = {0,0};
-                UINT h;
-                ClientToScreen(dstSwapchain->win_handle, &offset);
-                GetClientRect(dstSwapchain->win_handle, &windowsize);
-                h = windowsize.bottom - windowsize.top;
-                rect.x1 -= offset.x; rect.x2 -=offset.x;
-                rect.y1 -= offset.y; rect.y2 -=offset.y;
-                rect.y1 += This->currentDesc.Height - h; rect.y2 += This->currentDesc.Height - h;
-            }
-            TRACE("Drawing to %#x buffer\n", buffer);
+        if (dstSwapchain && (IWineD3DSurface *)This == dstSwapchain->frontBuffer) {
+            RECT windowsize;
+            POINT offset = {0,0};
+            UINT h;
+            ClientToScreen(dstSwapchain->win_handle, &offset);
+            GetClientRect(dstSwapchain->win_handle, &windowsize);
+            h = windowsize.bottom - windowsize.top;
+            rect.x1 -= offset.x; rect.x2 -=offset.x;
+            rect.y1 -= offset.y; rect.y2 -=offset.y;
+            rect.y1 += This->currentDesc.Height - h; rect.y2 += This->currentDesc.Height - h;
         }
 
         ENTER_GL();