So far, the message I've been getting about OpenGL lines is "don't bother".
However, it concerns me a bit. Say you have a scene which is a combination of lines and triangles. If I don't accelerate lines, then they have to be done in software, which sounds simple enough. But consider the case where a line is in front of some triangles and behind some. If the all the rasterization of the line is done in software, what do we do about the Z buffer state?
For chips that don't accelerate lines and points, how do their drivers solve this problem?
I have a crude solution to the antialiased lines which is to render four overlapping rectangles with alpha of 0.25. But as I say, it's crude, because you only get four gradations of pixel coverage.
Another crude solution is to rasterize a set of 6 triangles which are arranged such that alpha goes to 1 towards the center and towards 0 at the edges. This would be smoother but would still be a crude approximation.
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