The WEBGL_compressed_texture_atc
extension is part of the WebGL API and exposes 3 ATC compressed texture formats. ATC is a proprietary compression algorithm for compressing textures on handheld devices.
Compressed textures reduce the amount of memory needed to store a texture on the GPU, allowing for higher resolution textures or more of the same resolution textures.
WebGL extensions are available using the WebGLRenderingContext.getExtension()
method. For more information, see also Using Extensions in the WebGL tutorial.
Availability: ATC compression is typically available on mobile devices with Adreno GPUs, that are currently only built into Qualcomm Snapdragon devices.
This extension is available to both, WebGL1 and WebGL2 contexts.
Constants
The compressed texture formats are exposed by 3 constants and can be used in two functions: compressedTexImage2D()
and compressedTexSubImage2D()
.
ext.COMPRESSED_RGB_ATC_WEBGL
- Compresses RGB textures with no alpha channel.
ext.COMPRESSED_RGBA_ATC_EXPLICIT_ALPHA_WEBGL
- Compresses RGBA textures using explicit alpha encoding (useful when alpha transitions are sharp).
ext.COMPRESSED_RGBA_ATC_INTERPOLATED_ALPHA_WEBGL
- Compresses RGBA textures using interpolated alpha encoding (useful when alpha transitions are gradient).
Examples
var ext = gl.getExtension('WEBGL_compressed_texture_atc'); var texture = gl.createTexture(); gl.bindTexture(gl.TEXTURE_2D, texture); gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_RGB_ATC_WEBGL, 512, 512, 0, textureData);
Specifications
Specification | Status | Comment |
WEBGL_compressed_texture_atcThe definition of 'WEBGL_compressed_texture_atc' in that specification. | Draft | Initial definition. |
Browser compatibility
The compatibility table in 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 | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
WEBGL_compressed_texture_atc
|
Chrome
No support ? — 68 |
Edge
No support No |
Firefox No support 18 — 64 No support 18 — 64 No support ? — 58 Prefixed' Implemented with the vendor prefix: MOZ_ |
IE
? |
Opera
No support ? — 55 |
Safari
? |
WebView Android
No support ? — 68 |
Chrome Android
No support ? — 68 |
Firefox Android
? |
Opera Android
No support ? — 48 |
Safari iOS
? |
Samsung Internet Android
No support ? — 10.0 |
Legend
- No support
- No support
- Compatibility unknown
- Compatibility unknown
- Requires a vendor prefix or different name for use.'
- Requires a vendor prefix or different name for use.
See also
WebGLRenderingContext.getExtension()
WebGLRenderingContext.compressedTexImage2D()
WebGLRenderingContext.compressedTexSubImage2D()
WebGLRenderingContext.getParameter()
WEBGL_compressed_texture_atc by Mozilla Contributors is licensed under CC-BY-SA 2.5.