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July 07 2010
OpenGL Invariance: Texture AA
Using texture mapping for geometry antialiasing is not a new idea. I found descriptions and presentations about it, but no actual code. The basic idea is to replace the original primitive with texture mapped triangles, as illustrated:The texture applied to the triangles is simply an antialiased circle. Slices of the circle are stretched out for the line and triangle cases. To accommodate fractionally variable primitive sizes, we can generate the circle texture at an arbitrary maximum size and generate mipmaps for smaller sizes. Trilinear mipmapping will then approximate a texture for any desired size.
