org.lwjgl.opengl

Class EXTTextureFilterAnisotropic

java.lang.Object

org.lwjgl.opengl.EXTTextureFilterAnisotropic

public final class EXTTextureFilterAnisotropic
extends java.lang.Object

Native bindings to the EXT_texture_filter_anisotropic extension.

Texture mapping using OpenGL's existing mipmap texture filtering modes assumes that the projection of the pixel filter footprint into texture space is a square (ie, isotropic). In practice however, the footprint may be long and narrow (ie, anisotropic). Consequently, mipmap filtering severely blurs images on surfaces angled obliquely away from the viewer.

Several approaches exist for improving texture sampling by accounting for the anisotropic nature of the pixel filter footprint into texture space. This extension provides a general mechanism for supporting anisotropic texturing filtering schemes without specifying a particular formulation of anisotropic filtering.

The extension permits the OpenGL application to specify on a per-texture object basis the maximum degree of anisotropy to account for in texture filtering.

Increasing a texture object's maximum degree of anisotropy may improve texture filtering but may also significantly reduce the implementation's texture filtering rate. Implementations are free to clamp the specified degree of anisotropy to the implementation's maximum supported degree of anisotropy.

A texture's maximum degree of anisotropy is specified independent from the texture's minification and magnification filter (as opposed to being supported as an entirely new filtering mode). Implementations are free to use the specified minification and magnification filter to select a particular anisotropic texture filtering scheme. For example, a NEAREST filter with a maximum degree of anisotropy of two could be treated as a 2-tap filter that accounts for the direction of anisotropy. Implementations are also permitted to ignore the minification or magnification filter and implement the highest quality of anisotropic filtering possible.

Applications seeking the highest quality anisotropic filtering available are advised to request a LINEAR_MIPMAP_LINEAR minification filter, a LINEAR magnification filter, and a large maximum degree of anisotropy.

Field Summary

Fields

Modifier and Type	Field and Description
static int	GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT Accepted by the pname parameters of GetBooleanv, GetDoublev, GetFloatv, and GetIntegerv.
static int	GL_TEXTURE_MAX_ANISOTROPY_EXT Accepted by the pname parameters of GetTexParameterfv, GetTexParameteriv, TexParameterf, TexParameterfv, TexParameteri, and TexParameteriv.

Method Summary

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GL_TEXTURE_MAX_ANISOTROPY_EXT

public static final int GL_TEXTURE_MAX_ANISOTROPY_EXT

Accepted by the pname parameters of GetTexParameterfv, GetTexParameteriv, TexParameterf, TexParameterfv, TexParameteri, and TexParameteriv.

See Also:

Constant Field Values

GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT

public static final int GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT

Accepted by the pname parameters of GetBooleanv, GetDoublev, GetFloatv, and GetIntegerv.

See Also:

Constant Field Values