EXT_texture_compression_rgtc extension is part of the WebGL API and exposes 4 RGTC compressed texture formats. RGTC is a block-based texture compression format suited for unsigned and signed red and red-green textures (Red-Green Texture Compression).
- Each 4x4 block of texels consists of 64 bits of unsigned red image data. See also BC4 unsigned.
- Each 4x4 block of texels consists of 64 bits of signed red image data. See also BC4 signed.
- Each 4x4 block of texels consists of 64 bits of compressed unsigned red image data followed by 64 bits of compressed unsigned green image data. See also BC5 unsigned.
- Each 4x4 block of texels consists of 64 bits of compressed signed red image data followed by 64 bits of compressed signed green image data. See also BC5 signed.
var ext = gl.getExtension('EXT_texture_compression_rgtc'); var texture = gl.createTexture(); gl.bindTexture(gl.TEXTURE_2D, texture); gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RED_RGTC1_EXT, 128, 128, 0, textureData);
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