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The internal driver interface was also changed to use
BlendEquationSeparate instead of BlendEquation.
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data are broken out into a new struct span_arrays which is allocated
per-context (to avoid huge stack allocations - a problem on Windows).
This lets us use span.redStep instead of span->redStep (for example) to
hopefully get slightly better performance in the triangle functions.
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Slight optimization of _mesa_mmx_blend_add.
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Factorization of more common MMX code.
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Big clean-up of line drawing code.
Removed many obsolete span processing functions.
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ditch the pb (pixel buffer) code.
Converted point drawing, bitmaps and aa lines to use new span functions.
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with tighter interfaces with the rest of the world.
Proper documentation to come.
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