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Changed SWvertex's index field to GLfloat and fix a few other bits.
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glFogCoord didn't always work reliably.
ARB fragment program fog options work now.
Per-fragment fog computations are now perspective corrected.
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instead of GLfixed. (Justin Novosad)
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New comments discussing FIXED_FRAC_BITS, SUB_PIXEL_BITS, max viewport size
and rasterization accuracy.
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explicit casts and/or tweaking constant and variable definitions.
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Fixed some vertex array / vertex program glitches with glDrawElements.
Fixed some fragment program runtime bugs.
Non-trivial Cg programs are running now.
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Implemented DDX and DDY fragment program instructions (whew!)
Not fully tested yet.
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Re-org of some GL_NV_vertex_program code.
Replace MAX_TEXTURE_UNITS with MAX_TEXTURE_COORD_UNITS and MAX_TEXTURE_IMAGE_UNITS.
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function names
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on the stack frame in the point/line/triangle functions. (Klaus Niederkrueger)
This should solve the performance problem Karl found on Windows.
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type, width, interp mask and array mask.
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result in _very_ blurry textures. Still need to do some optimization
of the new code in s_span.c
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Updated comments, fixed indentation, etc.
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Removed last of span.filled* flags and Klaus's macros.
More simplification of triangle functions.
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struct sw_span is used throughout span/fragment processing.
This is leading to less code and more chances for optimization.
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Disabled tiny triangle threshold test.
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new triangle_span struct. Much cleaner code and possibilities for future
optimizations.
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