On 22.10.2015 15:57, Fredrik Höglund wrote:
On Thursday 22 October 2015, Nicolai Hähnle wrote:
The same clamping already happens for glTexParameteri. This change
also fixes a bug in mipmap generation, see
https://bugs.freedesktop.org/show_bug.cgi?id=91993
I don't think this patch is correct. The ARB_texture_view specification
doesn't say that MaxLevel should be initialized to the value of
TEXTURE_IMMUTABLE_LEVELS, only that it's interpreted relative to
the view and not relative to the original data store.
Liam Middlebrook also pointed out recently that the clamping done
in glTexParameteri is in fact a bug:
http://lists.freedesktop.org/archives/piglit/2015-June/016342.html
The language in the specification that says that MaxLevel is clamped
when the texture is immutable applies to texture minification,
magnification, and texture completeness; not to gl*Tex*Parameter*.
Ugh. I was torn between those two interpretations. I suppose nobody was
confident enough to change gl*Tex*Parameter* either ;)
Thinking more on this, there is also a problematic interaction between
glTextureView and glGenerate*Mipmap when the view does not extend to the
highest level in the underlying texture. Clearly, this part of the spec
could use some cleanups.
Any chance of an "official" clarification? I did not find corresponding
Issues in the corresponding extensions. What are non-Mesa drivers doing?
Cheers,
Nicolai
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