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Also, provide a separate flag to say whether the driver can handle
clipping/rhw tasks, in addition to the API flag which indicates they
have already been done.
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Also, implement support in the draw module. We were hardwiring these
to one for quite a long time...
Currently using a draw_set_edgeflags() function, may be better to push
the argument into the draw_arrays() function. TBD.
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quads)
New draw_enable_point_sprites() function.
Fixes spriteblast.c demo
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Allows drivers that implement line stipple to turn off this drawing 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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For hardware without native polygon stipple. Create a 32x32 alpha texture
that encodes the stipple pattern. Modify the user's fragment program to
sample the texture (with gl_FragCoord) and kill the fragment according to
the texel value.
Temporarily enabled in softpipe driver, replacing the sp_quad_stipple.c step.
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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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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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