WEBGL_compressed_texture_s3tc_srgb

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.

Availability: This extension is available to both WebGL1 and WebGL2 contexts.

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_srgb
The definition of 'WEBGL_compressed_texture_s3tc_srgb' in that specification.
Recommendation Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic supportChrome ? Edge ? Firefox Full support 55IE ? Opera ? Safari ? WebView Android ? Chrome Android ? Edge Mobile ? Firefox Android ? Opera Android ? Safari iOS ? Samsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also

Document Tags and Contributors

Contributors to this page: Sheppy, fscholz
Last updated by: Sheppy,