[Bug 92193] [SKL] ES2-CTS.gtf.GL2ExtensionTests.compressed_astc_texture.compressed_astc_texture fails

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed Sep 30 22:49:46 PDT 2015


--- Comment #5 from Tapani Pälli <lemody at gmail.com> ---
(In reply to Nanley Chery from comment #4)
> Looks like there's a bug in the CTS. It looks for the ASTC formats in the
> list returned by glGetIntegerv(GL_COMPRESSED_TEXTURE_FORMATS, ...). As
> mentioned in spec, the ASTC format enums won't be returned by this function:
> Interactions with OpenGL 4.2
>     OpenGL 4.2 supports the feature that compressed textures can be
>     compressed online, by passing the compressed texture format enum as
>     the internal format when uploading a texture using TexImage1D,
>     TexImage2D or TexImage3D (see Section 3.9.3, Texture Image
>     Specification, subsection Encoding of Special Internal Formats).
>     Due to the complexity of the ASTC compression algorithm, it is not
>     usually suitable for online use, and therefore ASTC support will be
>     limited to pre-compressed textures only. Where on-device compression
>     is required, a domain-specific limited compressor will typically
>     be used, and this is therefore not suitable for implementation in
>     the driver.
>     In particular, the ASTC format specifiers will not be added to
>     Table 3.14, and thus will not be accepted by the TexImage*D
>     functions, and will not be returned by the (already deprecated)
> I'll send a patch upstream to fix this. Should I take any further steps?

This sounds good, did you file a bug in Khronos bugzilla?

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