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.

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

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

Browser compatibility

See also

• WebGLRenderingContext.getExtension()