Merge pull request #253 from KhronosGroup/gitlab-issue-47
Update issue 4 in GL_ARB_texture_filter_anisotropy
diff --git a/extensions/ARB/ARB_texture_filter_anisotropic.txt b/extensions/ARB/ARB_texture_filter_anisotropic.txt
index b322e12..c0a9853 100644
--- a/extensions/ARB/ARB_texture_filter_anisotropic.txt
+++ b/extensions/ARB/ARB_texture_filter_anisotropic.txt
@@ -23,8 +23,8 @@
Version
- Last Modified Date: June 2, 2017
- Revision: 5
+ Last Modified Date: February 26, 2019
+ Revision: 6
Number
@@ -274,11 +274,13 @@
filtering performance or quality.
4) Should anything particular be said about anisotropic 3D texture
- filtering?
+ and cube texture filtering?
- Not sure. Does the implementation example shown in the spec for
- 2D anisotropic texture filtering readily extend to 3D anisotropic
- texture filtering?
+ RESOLUTION: NO. It was decided by the OpenGL working group to leave
+ anisotropic filtering for 3D or cube textures as undefined. Anisotropic
+ filtering is only well-defined for 2D and 2D array textures. For
+ defined results with 3D and cube textures isotropic filtering should
+ be used by setting the anisotropy level to 1.0.
5) Should the maximum degree of anisotropy be a sampler parameter?
@@ -289,6 +291,7 @@
Rev. Date Author Changes
---- ---------- --------- -----------------------------------------------
+ 6 2019-02-26 pdaniell Update issue 4 question and resolution.
5 2017-06-02 Jon Leech Include anisotropy state in sampler objects
(opengl/API/issues/15).
4 2017-05-29 dgkoch Minor typography/gramatical fixes from OpenGL 4.6.
