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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 thegl.getParameter()
call, and it returns the maximum available anisotropy. ext.TEXTURE_MAX_ANISOTROPY_EXT
- This is the
pname
argument to thegl.getTexParameter()
andgl.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
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|
Basic support | ? | 17 (17) [1] | ? | ? | ? |
Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|
Basic support | ? | ? | ? | ? | ? | ? |
[1] This extension was prefixed as MOZ_EXT_texture_filter_anisotropic
in prior versions.