Bug 10986

Summary:	compressed texture formats are broken
Product:	Mesa	Reporter:	Roland Scheidegger <sroland>
Component:	Drivers/DRI/i915	Assignee:	Zou Nan hai <nanhai.zou>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	michael.fu
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Roland Scheidegger 2007-05-17 18:12:49 UTC

Both i915 and i915tex have issues with s3tc formats.
This can most easily be seen if you modify tests/mipmap_limits.c to use a compressed texture format (for instance GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) instead of RGB as internal format (note you'll need libtxc_dxtn for this to work).
With both drivers, the 2 smallest mipmaps are broken.
Additionally, with the i915tex driver, all mipmaps except the first are broken (looks like they only get partially uploaded/blitted).

Comment 1 Roland Scheidegger 2007-05-18 16:05:06 UTC

Fixed in i915.
There seem to be more issues with that in i915tex, looks like it's broken in more places. Though at least along the way a problem causing huge performance with compressed textures is fixed now. In any case, the trouble with big mipmaps were not due to a driver bug (need a compression library which honors dstRowStride).

Comment 2 Roland Scheidegger 2007-05-18 20:11:41 UTC

mostly fixed in git head for i915tex.
This needs however another look, as there are obviously still issues (copying around very small compressed textures (width or height smaller than a block) in some driver paths will result in not copied or half-copied blocks, need to fix that in the right places without too many hacks).

Comment 3 Michael Fu 2008-02-18 23:14:24 UTC

we need to refresh the status for this bug on latest 915 driver.

Comment 4 Zou Nan hai 2008-02-28 00:14:44 UTC

This sample is ok on lastest build, how there is still one corner path that may hit this issue(height < 4 level), I have fixed in mesa.

Comment 5 Adam Jackson 2009-08-24 12:26:52 UTC

Mass version move, cvs -> git

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