Bug 10219

Summary:	incorrect mipmap is selected if set MIN_LOD with high value
Product:	Mesa	Reporter:	Wei Wang <wei.z.wang>
Component:	Drivers/DRI/i965	Assignee:	haihao <haihao.xiang>
Status:	VERIFIED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	mesa-dev, nian.wu
Version:	git
Hardware:	x86 (IA32)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	test case limitation for MIN_LOD in i965

Description Wei Wang 2007-03-07 18:01:43 UTC

Version: mesa master 3c44d68d78d8bddf69b5bd1a00f854d8cde971bb

Generate 7 level RGB mipmap from 64x64 (level 0) to 1x1 level6. After these parameter are assigned the corresponding value: BASE_LEVEL=1, MAX_LEVEL=1000, MIN_LOD=20, MAX_LOD=1000, opengl can use 2x2 mipmap when drawing 64x64 RGB rectangle instead of the 1x1 mipmap which is the right choice.

Under direct context or indirect (LIBGL_ALWAYS_INDIRECT=1) context, this bug happens. However, if i965 dri driver is removed, the bug disappear.

Comment 1 Wei Wang 2007-03-07 18:05:51 UTC

Created attachment 9027 [details]
test case

The case assigns each mipmap with diff color so we can identify which mipmap was used when drawing the rectangle. you can try to assign MY_MIN_LOD with diff value to see the diff behavior.

Comment 2 haihao 2007-03-18 06:21:42 UTC

Created attachment 9211 [details] [review]
limitation for MIN_LOD in i965

Check the upper limit of min_lod in i965.  Because Min LOD takes precedence in i965 if Min LOD is greater than Max LOD, it is unnecessary for max_lod.

Comment 3 haihao 2007-08-30 21:46:45 UTC

fixed in git
22bc3cdd49eb81d48ad4b8f06be0b9a9de624c91(mesa)

Comment 4 Adam Jackson 2009-08-24 12:26:09 UTC

Mass version move, cvs -> git

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