[PATCH] wined3d: Introduce a GLIncompatibleRawBlits registry value.

[Henri Verbeet]

On Fri, 17 Dec 2021 at 07:13, Conor McCarthy <cmccarthy at codeweavers.com> wrote:
> Setting this value to nonzero enables blitting of incompatible formats in
> raw_blitter_blit().
>
> Games may blit between a depth/stencil format and a colour format, even
> though it's invalid in D3D10/11. In some situations glCopyImageSubData()
> handles this well enough, with much higher performance than the FBO path.
>
Is that invalid in the sense that it doesn't work, or in the sense
that the documentation claims it's not allowed? If this is something
that works in practice, we'd want tests to go along with the fix.

On the OpenGL side, if this does indeed work reliably with
ARB_copy_image, we could just detect that during adapter
initialisation and set a quirk bit; we wouldn't need a registry
setting. Still, it this point, the most interesting question is
probably why it's so slow with FBO blits.