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The problem with T-junctions are that triangles that have a common edge (but not common vertex positions) aren't guaranteed to yield watertight rasterization due to differences in grid snapping
Yeah ... T junctions are straight-up incorrect. They will cause actual visible rendering artifacts (which get even worse under e.g. global illumination). Compared to that, a triangle fan is no big deal. Rasterizers used to have problems with thin triangles like 20 years ago,
but my understanding is that this has been solid now for a long time. Even if you are doing your own clipping or something, the kind of “thin triangle” that would cause problems would be much thinner than these.
Yeah the downside with fans (or thin tris in general) is that you end up with overshading because of tile shading granularity. But maybe this is less of an issue now?
This is still a significant efficiency problem. You can't shade smaller than a 2x2 block, and packing blocks from multiple triangles together in a single wavefront has a bunch of extra inefficiency.
Round triangles are best triangles.
It would be interesting to have a fan primitive where three of the vertices are designated as the ones that cause shading (negative indices?). All the other verts just affect rasterisation. Then you could combine all the fragments together in PS waves.
If you don't have vertex-interpolated values that you want to match up ... which most games would. It's just not worth the complexity.
I said "interesting" not "practical" :-)
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