Bug 35193

Summary:	[i915 gles2] double glClear(COLOR\|DEPTH) make rendering incorrect with DEPTH_TEST enabled without depthbuffer
Product:	Mesa	Reporter:	Shuang He <shuang.he>
Component:	Drivers/DRI/i915	Assignee:	Kenneth Graunke <kenneth>
Status:	RESOLVED DUPLICATE	QA Contact:
Severity:	normal
Priority:	medium
Version:	git
Hardware:	Other
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Shuang He 2011-03-10 19:37:26 UTC

System Environment:
--------------------------
Libdrm:         (master)2.4.23-6-g550fe2ca3b29ad2191eab4fdfbed9ed21e25492d
Mesa:           (master)6ed0f2ac112d22278cf051c2cee9c2199a9025ea
Xserver:               
(master)xorg-server-1.9.99.901-197-gea1ffd3e60bdcedbec5a6f28929f8677bf45d450
Xf86_video_intel:              
(master)2.14.0-25-g9184af921bc2f332fcb6c9b47001414378eab8e2


Bug detailed description:
-------------------------
This bug happens on Pineview. 
With a EGL config that doesn't have depthbuffer, with DEPTH_TEST(GL_LESS) enabled, and execute glClear(COLOR|DEPTH) twice will make following rendering incorrect. If glClear() is executed only once or call glViewport between two glClear() will make rendering correct

We may provide a simple test case to reproduce a bit later

Comment 1 Eric Anholt 2011-07-13 10:09:44 UTC

Based on the fix for bug #30080, I think that issue would have affected the case you're talking about.  If it's not fixed after #30080 lands, please reopen with a testcase.

*** This bug has been marked as a duplicate of bug 30080 ***

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