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Use the shader semantic info from there, instead of from pipe_shader_state.
Carry this idea to draw module and other drivers...
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Use tgsi_scan_shader() to determine if the fragment shader uses KIL or
writes fragment.z
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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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This is in a separate commit to ensure renames are properly preserved.
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