softgpu: Correct linear interp for uneven positions #16241
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If the start coordinate was something like 51.75, we were incorrectly drawing to 51. This can be seen in the Metal Slug intro (hrydgard#15755.)
Can't round to the pixel when calculating the S/T deltas. This fixes issues in Wipeout (hrydgard#16131) and Call of Duty bloom.
This was referenced Oct 17, 2022
hrydgard
approved these changes
Oct 17, 2022
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This fixes the software renderer issues in #15755, as well as the text rendering in #16131. It also makes a frame dump from #11573 render bloom correctly (it was slightly off before.)
The triangle fan change doesn't change either of those, but I noticed a rectangle that was still triangles and so handled more generically.
-[Unknown]