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EXT_texture_compression_bptc extension - Web APIs | MDN
The compressed texture formats are exposed by 4 constants and can be used in two functions: compressedTexImage2D()compressedTexSubImage2D()
ext.COMPRESSED_RGBA_BPTC_UNORM_EXT
Compresses 8-bit fixed-point data. Each 4x4 block of texels consists of 128 bits of RGBA or image data. See also BC7 format .
ext.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT
Compresses 8-bit fixed-point data. Each 4x4 block of texels consists of 128 bits of SRGB_ALPHA or image data. See also BC7 format .
ext.COMPRESSED_RGB_BPTC_SIGNED_FLOAT_EXT
Compresses high dynamic range signed floating point values. Each 4x4 block of texels consists of 128 bits of RGB data. It only contains RGB data, so the returned alpha value is 1.0. See also BC6H format .
ext.COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_EXT
Compresses high dynamic range unsigned floating point values. Each 4x4 block of texels consists of 128 bits of RGB data. It only contains RGB data, so the returned alpha value is 1.0. See also BC6H format .
const ext = gl.getExtension("EXT_texture_compression_bptc");
const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.compressedTexImage2D(
gl.TEXTURE_2D,
0,
ext.COMPRESSED_RGBA_BPTC_UNORM_EXT,
128,
128,
0,
textureData,
);
