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EXT_texture_filter_anisotropic extension

The EXT_texture_filter_anisotropic extension is part of the WebGL API and exposes two constants for anisotropic filtering (AF).

AF improves the quality of mipmapped texture access when viewing a textured primitive at an oblique angle. Using just mipmapping, these lookups have a tendency to average to grey.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

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

Constants

ext.MAX_TEXTURE_MAX_ANISOTROPY_EXT

This is the pname argument to the gl.getParameter() call, and it returns the maximum available anisotropy.

ext.TEXTURE_MAX_ANISOTROPY_EXT

This is the pname argument to the gl.getTexParameter() and gl.texParameterf() / gl.texParameteri() calls and sets the desired maximum anisotropy for a texture.

Examples

js

const texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);
const ext =
  gl.getExtension("EXT_texture_filter_anisotropic") ||
  gl.getExtension("MOZ_EXT_texture_filter_anisotropic") ||
  gl.getExtension("WEBKIT_EXT_texture_filter_anisotropic");
if (ext) {
  const max = gl.getParameter(ext.MAX_TEXTURE_MAX_ANISOTROPY_EXT);
  gl.texParameterf(gl.TEXTURE_2D, ext.TEXTURE_MAX_ANISOTROPY_EXT, max);
}

Specifications

Specification
WebGL EXT_texture_filter_anisotropic Khronos Ratified Extension Specification

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
EXT_texture_filter_anisotropic 3534 7912 47 11 2221 9.1 3737 3534 47 2221 9.3 4.03.0

See also

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https://developer.mozilla.org/en-US/docs/Web/API/EXT_texture_filter_anisotropic