WebGLRenderer: Add support for RGTC(ATI1/ATI2/BC4/BC5) compressed textures. #25180
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Description
Modern browsers now support
RGTC
compressed texture throughEXT_texture_compression_rgtc
, it's good to have it here also.MDN: https://developer.mozilla.org/en-US/docs/Web/API/EXT_texture_compression_rgtc
(I guess examples are not necessary for this, but I can make one if needed)