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Which side an edge is on decides whether a pixel center exactly on it is inside. The test divided with truncation, so a vertex 0.2 subpixels left of the opposite edge counted as on it, and a thin triangle's right edge became inclusive. Peace Walker (ULUS10509), ULJM05302 and mali_missing_circle PSP replays become exact. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
To get to 100% compatibility, we will need a software renderer as there are games out there that do tricks that can't really be faked in a sensible way. Useful for homebrew too that mix sw and accel rendering.