EXT_texture_compression_bptc extension
Limited availability
This feature is not Baseline because it does not work in some of the most widely-used browsers.
The EXT_texture_compression_bptc extension is part of the WebGL API and exposes 4 BPTC compressed texture formats. These compression formats are called BC7 and BC6H in Microsoft's DirectX API.
WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.
Constants
The compressed texture formats are exposed by 4 constants and can be used in two functions: compressedTexImage2D() and 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.
Examples
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,
);
Specifications
| Specification |
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| WebGL EXT_texture_compression_bptc Extension Specification |
Browser compatibility
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Legend
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