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This commit makes `StandardMaterial` use bindless textures, as implemented in PR #16368. Non-bindless mode, as used for example in Metal and WebGL 2, remains fully supported via a plethora of `#ifdef BINDLESS` preprocessor definitions. Unfortunately, this PR introduces quite a bit of unsightliness into the PBR shaders. This is a result of the fact that WGSL supports neither passing binding arrays to functions nor passing individual *elements* of binding arrays to functions, except directly to texture sample functions. Thus we're unable to use the `sample_texture` abstraction that helped abstract over the meshlet and non-meshlet paths. I don't think there's anything we can do to help this other than to suggest improvements to upstream Naga. |
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Bevy PBR
