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EXT_texture_filter_anisotropic

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.

Availability: 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

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

Specifications

Specification Status Comment
EXT_texture_filter_anisotropic
The definition of 'EXT_texture_filter_anisotropic' in that specification.
Recommendation Initial definition.

Browser compatibility

FeatureChromeFirefoxEdgeInternet ExplorerOperaSafari
Basic Support?17.0(Yes)???
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support??(Yes)????

See also

Document Tags and Contributors

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