WEBGL_compressed_texture_s3tc_srgb extension
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
js
const ext = gl.getExtension("WEBGL_compressed_texture_s3tc_srgb");
const 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 |
---|
WebGL WEBGL_compressed_texture_s3tc_srgb Extension Specification |
Browser compatibility
BCD tables only load in the browser