GS: Improve degenerate primitive testing in vertex kick and SW bounding box calculation. Other minor fixes. #13377
+71
−66
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Draft until fully tested.
Description of Changes
Rationale behind Changes
Some edge cases cause the degenerate primitive test to incorrectly pass or fail primitives, especially when antialiasing is enabled. This can result in issues such as #8677. These changes should fix that issue and address additional minor problems discussed in #13297.
Suggested Testing Steps
This update will affect any GS drawing, so testing games with both HW/SW under different options will be helpful. This should not affect performance much, so only accuracy needs to be checked.
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Copilot occasionaly for code completion.