The WEBGL_compressed_texture_s3tc_srgb
extension is part of the WebGL API and exposes four S3TC compressed texture formats for the sRGB colorspace.
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.
Constants
The compressed texture formats are exposed by four constants and can be used in two functions: compressedTexImage2D()
and compressedTexSubImage2D()
.
ext.COMPRESSED_SRGB_S3TC_DXT1_EXT
- A DXT1-compressed image in an sRGB image format.
ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
- A DXT1-compressed image in an sRGB image format with a simple on/off alpha value.
ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
- A DXT3-compressed image in an sRGBA image format.
ext.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
- A DXT5-compressed image in an sRGBA image format.
Examples
var ext = gl.getExtension('WEBGL_compressed_texture_s3tc_srgb'); var texture = gl.createTexture(); gl.bindTexture(gl.TEXTURE_2D, texture); gl.compressedTexImage2D(gl.TEXTURE_2D, 0, ext.COMPRESSED_SRGB_S3TC_DXT1_EXT, 512, 512, 0, textureData); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR); gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
Specifications
Specification | Status | Comment |
WEBGL_compressed_texture_s3tc_srgbThe definition of 'WEBGL_compressed_texture_s3tc_srgb' in that specification. | Recommendation | 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_s3tc_srgb
|
Chrome
Full support Yes |
Edge
Full support ≤79 |
Firefox
Full support 55 |
IE
? |
Opera
Full support Yes |
Safari
? |
WebView Android
Full support Yes |
Chrome Android
Full support Yes |
Firefox Android
? |
Opera Android
Full support Yes |
Safari iOS
? |
Samsung Internet Android
Full support Yes |
Legend
- Full support
- Full support
- Compatibility unknown
- Compatibility unknown
See also
- S3 Texture Compression – OpenGL wiki
WebGLRenderingContext.getExtension()
WebGLRenderingContext.compressedTexImage2D()
WebGLRenderingContext.compressedTexSubImage2D()
WebGLRenderingContext.getParameter()
WEBGL_compressed_texture_s3tc_srgb by Mozilla Contributors is licensed under CC-BY-SA 2.5.