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Previously, it was trying to mess around with the varying's
WM setup data to produce a result. Along with not actually working when
passed a varying, this wouldn't work if you did dFd[xy]() on a temporary.
Instead, just calculate the derivative using the neighbors in the subspan.
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I ran into this lack of support when writing a shader that always discarded
the fragments.
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This gets two more glean glsl1 tests using the non-GLSL path.
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This also cuts instructions by just using the existing bit in the payload
rather than computing it from the determinant in the SF unit and passing it
as a varying down to the WM. Something still goes wrong with getting the
backface color right, but a simpler shader appears to get the right result.
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GLSL shadow() sampler calls are properly propogated down to the driver now.
The glean glsl1 shadow() tests work (except for the alpha channel).
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While OPCODE_SWZ has usually been optimized away in pass0, it may still
exist if a SWZ with dst saturate was emitted in pass_fp. Fixes an error
in oglconform fpalu.c.
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Mostly:
- update #includes
- update STATE_* token code
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This driver comes from Tungsten Graphics, with a few further modifications by
Intel.
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