WebGLRenderer: Optimize cube UV mapping with branchless shader code #32100
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Description
This PR eliminates branching in cube UV reflection fragment shader and may improve performance on mobile GPUs 🤞
https://raw.githack.com/mrdoob/three.js/branchless-cubeuv/examples/index.html
https://raw.githack.com/mrdoob/three.js/branchless-cubeuv/test_cube_uv_performance.html