VideoCommon: Round bounding box coordinates down and remove pixel center offset #9781
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…ter offset Fragment coordinates always have a 0.5 offset from a whole integer, as that's where the pixel center is on modern GPUs. Therefore, we want to always round the fragment coordinates down for bounding box calculations. This also renders the pixel center offset useless, as 0.5 vs ~0.5833333 makes no difference when rounding down.
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For OpenGL/Vulkan, this causes artifacts in Disney's Magical Mirror, Disney's Hide and Sneak, and whatever the third one I have is that's in Japanese that I don't feel like looking up. Super Paper Mario, Paper Mario TTYD hangs are fixed. Ultimate Spider-Man is still fine. Speed Challenge hangs before I can test Bounding Box. |
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I'm merging this because it literally can't make things worse at this point. We can review/perfect things after the progress report. |
blaahaj
reviewed
Jun 6, 2021
| // The rightmost shaded pixel is not included in the right bounding box register, | ||
| // such that width = right - left + 1. This has been verified on hardware. | ||
| int2 pos = iround(rawpos * cefbscale + offset); | ||
| int2 pos = int2(rawpos * cefbscale); |
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Will this produce correct result for cefbscale > 1?
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Fragment coordinates always have a 0.5 offset from a whole integer, as that's where the pixel center is on modern GPUs. Therefore, we want to always round the fragment coordinates down for bounding box calculations. This also renders the pixel center offset useless, as 0.5 vs ~0.5833333 makes no difference when rounding down.
Fixes softlocks in certain cutscenes of Paper Mario: TTYD and Super Paper Mario, caused (presumably) by rounding up to a coordinate outside the render area.