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authorRoland Scheidegger <[email protected]>2017-12-12 04:22:28 +0100
committerRoland Scheidegger <[email protected]>2017-12-12 04:23:02 +0100
commit84c363fb09167bc45aeba95423b20bee7293f44a (patch)
tree238e528af552b76379738dae1964986d6c680074 /src/mesa/state_tracker
parent24f019fd6911c360f32ebdb474375212706fff62 (diff)
gallivm: fix texture wrapping for texture gather for mirror modes
Care must be taken that all coords end up correct, the tests are very sensitive that everything is correctly rounded. This doesn't matter for bilinear filter (since picking a wrong texel with weight zero is ok), and we could also switch the per-sample coords mistakenly. While here, also optimize the coord_mirror helper a bit (we can do the mirroring directly by exploiting float rounding, no need for fixing up odd/even manually). I did not touch the mirror_clamp and mirror_clamp_to_border modes. In contrast to mirror_clamp_to_edge and mirror_repeat these are legacy modes. They are specified against old gl rules, which actually does the mirroring not per sample (so you get swapped order if the coord is in the mirrored section). I think the idea though is that they should follow the respecified mirror_clamp_to_edge rules so the order would be correct. Reviewed-by: Jose Fonseca <[email protected]>
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