Bug 71780 - ETC2 formats not returned by glGet with GL_ARB_ES3_compatibility
Summary: ETC2 formats not returned by glGet with GL_ARB_ES3_compatibility
Status: RESOLVED NOTABUG
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/DRI/i965 (show other bugs)
Version: 9.1
Hardware: x86 (IA32) Linux (All)
: medium minor
Assignee: Ian Romanick
QA Contact: Intel 3D Bugs Mailing List
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Reported: 2013-11-19 10:21 UTC by Stanislav Vorobiov
Modified: 2013-11-19 20:38 UTC (History)
0 users

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Description Stanislav Vorobiov 2013-11-19 10:21:31 UTC 
With GL_ARB_ES3_compatibility glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS, ...) 
does not return any of
GL_COMPRESSED_R11_EAC..GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC, but they work when passed to glCompressedTexImage2D. 

glxinfo:
OpenGL vendor string: Intel Open Source Technology Center
OpenGL renderer string: Mesa DRI Intel(R) Ivybridge Desktop x86/MMX/SSE2
OpenGL version string: 3.0 Mesa 9.1.7
OpenGL shading language version string: 1.30
uname -a:
Linux xxx 3.11.0-13-generic #20~precise2-Ubuntu SMP Thu Oct 24 21:07:45 UTC 2013 i686 i686 i386 GNU/Linux
Comment 1 Ian Romanick 2013-11-19 20:38:22 UTC 
They're not supposed to be returned.  The intent of this (useless) query was that applications could get enums for unknown formats, pass them to glTexImage[123]D, and have the driver compress the textures.  There is no on-line compressor for ETC, ETC2, or EAC formats.

Also note that this query has been deprecated in later GL versions.

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