[libks r7 system]
- enhance performance.
[r7]
- fix bug about texture out of bound cause part of triangle don't render.
[r7]
- try to fix some overlapping.
[r7]
- re-organize codes.
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[r7]
- fix cache pixel bug.
[r7]
- fix texture uv mapping, for 'top_flat' triangle, the Y uv move 1 pixel up.
[r7]
- now the 256x256 texture mapping totally the same as the original image.
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