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Allows drivers that implement line stipple to turn off this drawing stage.
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stage
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This fixes a validation/code-path problem. Enabling the stage for the sake
of wide points also inadvertantly caused wide lines to be converted to tris
when we actually want them passed through, such as for the AA line stage.
This is just cleaner now.
Also, replace draw_convert_wide_lines() with draw_wide_line_threshold() as
was done for points. Allows for 1-pixel lines to be converted too if needed.
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vertex attribs
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Use tgsi_scan_shader() to populate a tgsi_shader_info struct and use that instead.
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Specifying a threshold size is a bit more flexible, and allows the option
of converting even 1-pixel points to triangles (set threshold=0).
Also, remove 0.25 pixel bias in wide_point().
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This simplifies drivers using the draw module and removes the last dependency
on vertex-shader "internals". Since the draw module is producing the
post-transformed vertices, it makes sense to ask it where specific vertex
attributes are located.
This could also simplify some things in the state tracker code for selection,
feedback, rasterpos...
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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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Take a baby step to straightening out vertex paths.
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New draw/prim stage: draw_aaline. When installed, lines are replaced by
textured quads to do antialiasing. The current user-defined fragment shader
is modified to do a texture fetch and modulate fragment alpha.
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"aux" is a reserved name on Windows (X_X)
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