Rename uv to uv_a and VERTEX_UVS to VERTEX_UVS_A in shaders.
#10237
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We now support two sets of UVs, so `uv` and `VERTEX_UVS` in shaders are now ambiguous. To solve this, we explicitly mark the UV set we're using in the shaders, so as to distinguish it from the second UV set used for lightmaps in PR The obvious question is "why use `UV_A` and `UV_B` instead of UV0 and UV1?" The answer is that Naga doesn't currently allow preprocessor definitions that end in numbers. To work around this restriction, I renamed UV0 to `UV_A` and UV1 to `UV_B`.
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alice-i-cecile
added
A-Rendering
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a quick correction - preprocessor definitions that end in numbers or _ should be fine i think. the problem is that struct members can't end in numbers or underscores - the |
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Objective
We now support two sets of UVs, so
uvandVERTEX_UVSin shaders are now ambiguous.Solution
To solve this, we explicitly mark the UV set we're using in the shaders, so as to distinguish it from the second UV set used for lightmaps in PR #10231.
The obvious question is "why use
UV_AandUV_Binstead of UV0 and UV1?" The answer is that Naga doesn't currently allow preprocessor definitions that end in numbers. To work around this restriction, I renamed UV0 toUV_Aand UV1 toUV_B.Changelog
Changed
uvfield is nowuv_a, and the corresponding define changed fromVERTEX_UVStoVERTEX_UVS_A, for clarity when multiple UV sets are involved.Migration Guide
uvfield of the vertex input or output in a custom shaders, change it touv_a. Likewise, the corresponding define should be changed fromVERTEX_UVStoVERTEX_UVS_A.