EXT_texture_compression_rgtc WebGL extensionThe EXT_texture_compression_rgtc extension for WebGL 1.0 and 2.0 contexts adds RGTC compressed texture formats. RGTC is a block-based texture compression format suited for unsigned and signed red and red-green textures. Also known as Red-Green Texture Compression.webgl-extensionsWebGL extensionsnewly2025-05-12https://registry.khronos.org/webgl/extensions/EXT_texture_compression_rgtc/https://developer.mozilla.org/docs/Web/API/EXT_texture_compression_rgtcapi.EXT_texture_compression_rgtchttps://nowyoucanuse.com/features--ext-texture-compression-rgtc.html