vrend: rework the TBO swizzle shader key evaluation

Use forced swizzles up-front, and only skip over some compat profile
formats.

v2: use exact swizzle type and array sizes

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/1174>
1 file changed