v2: Add separate stencil S8 W-tile swizzling/deswizzling. Tested for
the swizzling case with env INTEL_SEPARATE_STENCIL=1 INTEL_HIZ=1
./bin/hiz-depth-stencil-test-fbo-d24-s8
v3: Apply Chad's fix for S8 window system buffers.
Reviewed-by: Chad Versace <chad@chad-versace.us>
Since the TNL is all done in software anyway, it should be the same to
the user who's probably using ARB_vertex_program otherwise, but gives them
a nicer programming environment.
This lets us avoid duplicated code for doing so, including the depthstencil
paths that aren't covered by SpanRenderStart/Finish. Those paths were
missing the span funcs setup, leading to a null dereference in the fbotexture
demo.
The boolean that the server gives us for whether the region is tiled was
getting used as the enum for what tiling mode. Instead, guess the correct
tiling in screen setup.
Also, fix the Y-tiling pitch setup. The pitch to the next tile in Y is
32 scanlines, not 8.
