Bug 47217

Summary: [bisected] Piglit spec_ARB_texture_float_fbo-blending-formats regressed
Product: Mesa Reporter: lu hua <huax.lu>
Component: Drivers/DRI/i965Assignee: Ian Romanick <idr>
Status: VERIFIED FIXED QA Contact:
Severity: major    
Priority: high CC: brianp, xunx.fang
Version: git   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description lu hua 2012-03-11 22:26:37 UTC 
System Environment:
--------------------------
Arch:        i386
Platform:    Sandybridge
Libdrm:	     (master)2.4.31-17-g99c73378a1b440bcf594742445dfe14ab1e89128
Xserver:	     (master)xorg-server-1.12.0
Xf86_video_intel:(master)2.18.0-65-gc25a3f7f46010660f441070ab7b9d5d1bc39ed0d
Libva_intel_driver:(vaapi-ext)304bf4dd752c5d0edd6bcdf87efaaa7db503a1c3
Kernel: 	(drm-intel-next-queued) fa37d39e4c6622d80bd8061d600701bcea1d6870

Bug detailed description:
-----------------------------
It fails on Sandybridge, Ivybridge and Ironlake with mesa master branch.It does not happen on mesa 8.0 branch.

Bisect shows ad897fff7730298c21289768d9b1b55f3d166ac5 is the first bad commit.
commit ad897fff7730298c21289768d9b1b55f3d166ac5
Author: Brian Paul <brianp@vmware.com>
Date:   Wed Feb 29 20:55:50 2012 -0700

    mesa: use _mesa_rebase_rgba_float/uint() in glReadPixels code

    See the comments for _mesa_rebase_rgba_float() for details.
    Fixes https://bugs.freedesktop.org/show_bug.cgi?id=46679

    NOTE: This is a candidate for the 8.0 branch.

    Reviewed-by: José Fonseca <jfonseca@vmware.com>

Reproduce steps:
----------------------------
1. start X
2. ./fbo-blending-formats -auto GL_ARB_texture_float
Comment 1 lu hua 2012-03-11 22:30:14 UTC 
Case 'spec_ARB_texture_float_fbo-alphatest-formats' also fails and has same commit.
Comment 2 Brian Paul 2012-03-12 09:04:04 UTC 
This might be the same thing as bug 47175 (a newly exposed defect in the piglit test).  I'll check it out.
Comment 3 Brian Paul 2012-03-13 07:54:30 UTC 
This was a piglit bug.  Fixed with piglit commit d17bcdffe3b7e90ca2a7ecd853be22cde9ca111e
Comment 4 lu hua 2012-03-19 02:37:41 UTC 
Verified. Fixed with commit d17bcdffe3b7e90ca2a7ecd853be22cde9ca111e

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