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aaline/point/pstipple stages
Added a void *draw ptr to pipe_context. Probably look for a better solution someday.
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Use tgsi_scan_shader() to populate a tgsi_shader_info struct and use that instead.
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of IF/ELSE/ENDIF
Allows the shader to work on i915 hardware.
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AA points are drawn by converting the point to a quad, then modifying the
user's fragment shader to compute a coverage value. The final fragment
color's alpha is modulated by the coverage value. Fragments outside the
point's radius are killed.
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