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i965/fs: Assume shadow sampler swizzling is <X, X, X, 1>.
Our previous assumption, SWIZZLE_XYZW, was completely bogus for depth
textures. There are no Y, Z, or W components.
DEPTH_TEXTURE_MODE has three options:
- GL_LUMINANCE: <X, X, X, 1>
- GL_INTENSITY: <X, X, X, X>
- GL_ALPHA: <0, 0, 0, X>
The default value is GL_LUMINANCE, and most applications don't seem to
alter DEPTH_TEXTURE_MODE. Make that our precompile guess.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>