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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/WEBGL_compressed_texture_s3tc_srgb below:

WEBGL_compressed_texture_s3tc_srgb extension - Web APIs

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 an 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

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 Browser compatibility

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