wined3d: Check the alignment of mapped buffer pointers.

Windows returns 32 byte aligned pointers when locking vertex and index buffers, and some applications(Half Life 2, Alpha Prime, possibly others) rely on this. Check the alignment and fall back to double buffered buffers with HeapAlloced and aligned pointers if the alignment doesn't fit.

wined3d: Check the alignment of mapped buffer pointers.
cc6d17ba · Stefan Dösinger · Alexandre Julliard · 6c53871d · cc6d17ba
Commit cc6d17ba authored Mar 11, 2010 by Stefan Dösinger Committed by Alexandre Julliard Mar 16, 2010
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buffer.c dlls/wined3d/buffer.c +15 -0

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--- a/dlls/wined3d/buffer.c
+++ b/dlls/wined3d/buffer.c
@@ -1186,6 +1186,21 @@ static HRESULT STDMETHODCALLTYPE buffer_Map(IWineD3DBuffer *iface, UINT offset, 
                    This->resource.allocatedMemory = GL_EXTCALL(glMapBufferARB(This->buffer_type_hint, GL_READ_WRITE_ARB));
                }
                LEAVE_GL();
+
+                if (((DWORD_PTR) This->resource.allocatedMemory) & (RESOURCE_ALIGNMENT - 1))
+                {
+                    WARN("Pointer %p is not %u byte aligned, falling back to double buffered operation\n",
+                        This->resource.allocatedMemory, RESOURCE_ALIGNMENT);
+
+                    ENTER_GL();
+                    GL_EXTCALL(glUnmapBufferARB(This->buffer_type_hint));
+                    checkGLcall("glUnmapBufferARB");
+                    LEAVE_GL();
+                    This->resource.allocatedMemory = NULL;
+
+                    buffer_get_sysmem(This);
+                    TRACE("New pointer is %p\n", This->resource.allocatedMemory);
+                }
                context_release(context);
            }
        }