Bug 50325

Summary:	Glyphy bad render on r600g (software render is fine) - too many registers?
Product:	Mesa	Reporter:	Török Edwin <edwin+bugs>
Component:	Drivers/Gallium/r600	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:
Severity:	normal
Priority:	medium	CC:	freedesktop
Version:	8.0
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:
Attachments:	apitrace (cf. https://github.com/apitrace/apitrace/tree/1.0) r600g-bad.png sw-good.png

Description Török Edwin 2012-05-24 14:56:46 UTC

Created attachment 62078 [details]
apitrace (cf. https://github.com/apitrace/apitrace/tree/1.0)

I just tried Glyphy on r600g and the output is very bad.
Don't know if its Glyphy bug or Mesa bug, but if I force software rendering in Mesa then I do see the output.

Attached screenshots of bad (r600g) and good (software render).

The bad render was obtained by:
demo/glyphy-demo

The good one:
LIBGL_ALWAYS_SOFTWARE=1 demo/glyphy-demo

I tested on:
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV730
OpenGL version string: 2.1 Mesa 8.0.2
OpenGL shading language version string: 1.20

I'll try to test on mesa git later to see if its still an issue there.

Also attached is a an apitrace, and the bad render can be reproduced with:
build/glretrace lt-glyphy-demo.trace

The good render (initialization a bit slow, but works):
LIBGL_ALWAYS_SOFTWARE=1 build/glretrace lt-glyphy-demo.trace

The source code for Glyphy can be found here:
https://code.google.com/p/glyphy/source/checkout

Comment 1 Török Edwin 2012-05-24 14:57:08 UTC

Created attachment 62079 [details]
r600g-bad.png

Comment 2 Török Edwin 2012-05-24 14:57:24 UTC

Created attachment 62080 [details]
sw-good.png

Comment 3 Török Edwin 2012-05-25 00:22:27 UTC

With the git version of Mesa I get an error, opened new bug here: https://bugs.freedesktop.org/show_bug.cgi?id=50338
EE r600_shader.c:140 r600_pipe_shader_create - translation from TGSI failed !

Comment 4 Török Edwin 2012-05-26 01:52:53 UTC

(In reply to comment #3)
> With the git version of Mesa I get an error, opened new bug here:
> https://bugs.freedesktop.org/show_bug.cgi?id=50338
> EE r600_shader.c:140 r600_pipe_shader_create - translation from TGSI failed !

The bad render might be because the shader tries to use too many registers, some earlier version of Mesa git printed some errors about GPR count limit being exceeded.

Comment 5 cyberkm 2016-06-24 12:56:04 UTC

Bump

Comment 6 Vedran Miletić 2016-06-24 15:42:51 UTC

(In reply to cyberkm from comment #5)
> Bump

Have you confirmed it happens with latest Mesa git? What hardware did you try it on?

Comment 7 cyberkm 2016-07-01 13:31:15 UTC

Yep, latest mesa git.

05:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Antilles [Radeon HD 6990]

mesa r600 gallium.

The app works fine if i switch to software renderer.

Comment 8 Gert Wollny 2017-10-08 16:11:31 UTC

Could you re-test with the latest mesa-git? As of mid September some patches landed that improved the register use. 

I myself tried it on an AMD 6850 HD and the trace works fine now.

Comment 9 Gert Wollny 2018-03-06 18:33:59 UTC

This should be fixed since version 17.2.

Comment 10 Gert Wollny 2018-03-06 18:41:26 UTC

Actually, that should be v17.3.

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