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and no more switches inside loops. To do: give the 1D/3D/cube routines the
same treatment.
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Use fast approximation to log().
Check for dq==0 to avoid a per-pixel divide.
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Fix GLuint compare bugs
Fix RESET_STIPPLE calls
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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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Major clean-up of pixel zoom code.
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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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_mesa_rasterize_span() is gone, replaced by new _mesa_write_textured_span().
Removed some unneeded triangle functions - more simplification possible.
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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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