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If the determinant of the triangle is positive, its winding is CCW (right-handed coord system).
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Improved comments for that loop.
Added some sanity check assertions regarding vertex layout.
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Not really signficant now since draw_flat stage copies the provoking
vertex color to all prim verts.
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right thing.
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Don't bother trying to save a small memcpy.
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This removes the notion of multiple color buffers from all other stages.
Will need a bit more work when shaders with multiple render targets arrive.
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The edge vectors were totally wrong.
Need to multiply bias units by the min resolvable depth delta.
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Updated comments/questions about area vs. prim->det.
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Need to use a new prim_header for the post-clipped line. Otherwise,
we were changing the header passed to us from the vb code. That messed
up the vertex pointers for the next line primitive.
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Using floats (and float->ushort->float conversion) introduces errors.
Only GLushort depth buffers work for now...
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