Bug 13652

Summary: [i915 TTM] texture with GL_ALPHA format applied incorrectly with blending
Product: Mesa Reporter: Shuang He <shuang.he>
Component: Drivers/DRI/i915Assignee: Eric Anholt <eric>
Status: VERIFIED FIXED QA Contact:
Severity: normal    
Priority: medium CC: dri-devel, eric
Version: unspecified   
Hardware: Other   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments: test case
xorg conf

Description Shuang He 2007-12-14 00:43:49 UTC 
System Environment:
--------------------------
--Platform: FC6
--Xf86_video_intel:6f92200db39a790c95c1fac64baf0bd41a70e481 
--Mesa:e2ca788ae700aae75bf8d024c1374c38cc5574f9 
--DRM:f1a99ddc14ebca303f20b6c23bd289fc887243ae
--Kernel:2.6.22

Bug detailed description:
--------------------------
This issue doesn't happen when INTEL_NO_TTM is set
And this issue doesn't happen on 965 platform

create a texture with GL_ALPHA format
set glBlendFunc(GL_ZERO, GL_SRC_ALPHA); and enabled glEnable(GL_BLEND);
render a polygon with this texture, but the alpha component turns out incorrect

Reproduce steps:
----------------
start X
compile and run the attached test case


Current result:
----------------
the alpha component is not correct

Expected result:
----------------
the alpha component should be correct
Comment 1 Shuang He 2007-12-14 00:47:18 UTC 
Created attachment 13104 [details]
test case

the correct result should look like this:

buf[0, 0] = (0.000000, 0.000000, 0.000000, 0.501961)
(0, 0) = [0.000000, 0.000000, 0.000000, 0.501961]
(1, 0) = [0.000000, 0.000000, 0.000000, 0.501961]
(2, 0) = [0.000000, 0.000000, 0.000000, 0.501961]
(3, 0) = [0.000000, 0.000000, 0.000000, 0.149020]
(0, 1) = [0.000000, 0.000000, 0.000000, 0.501961]
(1, 1) = [0.000000, 0.000000, 0.000000, 0.501961]
(2, 1) = [0.000000, 0.000000, 0.000000, 0.501961]
(3, 1) = [0.000000, 0.000000, 0.000000, 0.149020]
(0, 2) = [0.000000, 0.000000, 0.000000, 0.501961]
(1, 2) = [0.000000, 0.000000, 0.000000, 0.501961]
(2, 2) = [0.000000, 0.000000, 0.000000, 0.501961]
(3, 2) = [0.000000, 0.000000, 0.000000, 0.149020]
(0, 3) = [0.000000, 0.000000, 0.000000, 0.501961]
(1, 3) = [0.000000, 0.000000, 0.000000, 0.501961]
(2, 3) = [0.000000, 0.000000, 0.000000, 0.501961]
(3, 3) = [0.000000, 0.000000, 0.000000, 0.149020]
Comment 2 Shuang He 2007-12-14 00:48:21 UTC 
Created attachment 13105 [details]
xorg conf
Comment 3 Shuang He 2007-12-28 21:22:26 UTC 
seems this issue has gone with git tip code.

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