Bug 29518

Summary: [r300g] [regression] Depth clamping broke Regnum Online
Product: Mesa Reporter: Sven Arvidsson <sa>
Component: Drivers/DRI/r300Assignee: Default DRI bug account <dri-devel>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
URL: http://www.regnumonline.com.ar/
Whiteboard:
i915 platform: i915 features:
Attachments: Screenshot of RO

Description Sven Arvidsson 2010-08-11 15:28:07 UTC 
Created attachment 37802 [details]
Screenshot of RO

Lately I have noticed that the game Regnum Online have regressed, it has never worked perfectly (see bug 28847) but now it's only rendering garbage.

Bisecting leads to this:

ca7ead03da4481cd34933175898f4a924e588ad4 is the first bad commit
commit ca7ead03da4481cd34933175898f4a924e588ad4
Author: Marek Olšák <maraeo@gmail.com>
Date:   Tue Jul 20 16:37:22 2010 +0200

    r300g: implement depth clamp
    
    Depth clamping seems to be implicit if clipping is disabled.
    
    It's not perfect, but it's good enough for wine and passes
    the corresponding piglit tests.

:040000 040000 2c23739a006e4151928169bfb4da12b323c4d2c7 bcd5168351aa7e5b75ed39bdea8e7e7eb5caf2ed M	src

I have confirmed the problem by reverting said commit.
Comment 1 Marek Olšák 2010-08-11 18:37:28 UTC 
It's rendering only garbage here, with or without that patch.
Comment 2 Sven Arvidsson 2010-08-12 05:41:05 UTC 
In that case you're probably running it with the shader backend, you need to change it to the fixed function pipeline (in the options).
Comment 3 Marek Olšák 2010-08-12 18:12:22 UTC 
Depth clamp disabled by commit 16e782b83f298fcf82bbb277690ac0c713e90e21. Closing..

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