Web/API/EXT texture compression bptc

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.

Availability: Support depends on the system's graphics driver. There is no support on Windows.

This extension is available to both, WebGL1 and WebGL2 contexts.

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

var ext = gl.getExtension('EXT_texture_compression_bptc');

var 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	Status
EXT_texture_compression_bptc	Community Approved

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`EXT_texture_compression_bptc`	Chrome No support No	Edge No support No	Firefox Full support 68	IE No support No	Opera No support No	Safari No support No	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support No

Legend

Full support: Full support
No support: No support