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wined3d: Fix LockRect memory location calculation for WINED3DFMT_DXT*.

This commit is contained in:
Erich Hoover 2007-03-12 17:07:12 -06:00 committed by Alexandre Julliard
parent 7a43e79087
commit 01199072dd
2 changed files with 13 additions and 3 deletions
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2
dlls/d3d9/tests/surface.c
View File

@ -218,7 +218,7 @@ static void test_lockrect_offset(IDirect3DDevice9 *device)
offset = (BYTE *)locked_rect.pBits - base;
expected_offset = (rect.top / dxt_formats[i].block_height) * locked_rect.Pitch
+ (rect.left / dxt_formats[i].block_width) * dxt_formats[i].block_size;
todo_wine ok(offset == expected_offset, "Got offset %u, expected offset %u for format %s\n", offset, expected_offset, dxt_formats[i].name);
ok(offset == expected_offset, "Got offset %u, expected offset %u for format %s\n", offset, expected_offset, dxt_formats[i].name);
hr = IDirect3DSurface9_UnlockRect(surface);
ok(SUCCEEDED(hr), "UnlockRect failed (%08x)\n", hr);

14
dlls/wined3d/surface.c
View File

@ -623,8 +623,18 @@ static HRESULT WINAPI IWineD3DSurfaceImpl_LockRect(IWineD3DSurface *iface, WINED
return WINED3DERR_INVALIDCALL;
}
if (This->resource.format == WINED3DFMT_DXT1) { /* DXT1 is half byte per pixel */
pLockedRect->pBits = This->resource.allocatedMemory + (pLockedRect->Pitch * pRect->top) + ((pRect->left * This->bytesPerPixel / 2));
/* DXTn textures are based on compressed blocks of 4x4 pixels, each
* 16 bytes large (8 bytes in case of DXT1). Because of that Pitch has
* slightly different meaning compared to regular textures. For DXTn
* textures Pitch is the size of a row of blocks, 4 high and "width"
* long. The x offset is calculated differently as well, since moving 4
* pixels to the right actually moves an entire 4x4 block to right, ie
* 16 bytes (8 in case of DXT1). */
if (This->resource.format == WINED3DFMT_DXT1) {
pLockedRect->pBits = This->resource.allocatedMemory + (pLockedRect->Pitch * pRect->top / 4) + (pRect->left * 2);
} else if (This->resource.format == WINED3DFMT_DXT2 || This->resource.format == WINED3DFMT_DXT3
|| This->resource.format == WINED3DFMT_DXT4 || This->resource.format == WINED3DFMT_DXT5) {
pLockedRect->pBits = This->resource.allocatedMemory + (pLockedRect->Pitch * pRect->top / 4) + (pRect->left * 4);
} else {
pLockedRect->pBits = This->resource.allocatedMemory + (pLockedRect->Pitch * pRect->top) + (pRect->left * This->bytesPerPixel);
}