GPU: Fix safe size checks when rect offscreen #13941
Merged
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Related to #13327 and #12858. When something had all coordinates negative, we could set safeWidth or safeHeight to negative values. This would then overflow to very positive values (since they are uint16_t) and cause incorrect clearing.
For desktop, this is the cause of #13916 (possibly also mobile.) May also be the cause of #13346 and #13344. If so perhaps we can consider removing the "skip first frame" hack.
-[Unknown]