Bug 48787

Summary: [regression bisected] Doom3 generates DrawElements warnings, doesn't draw
Product: Mesa Reporter: Ian Romanick <idr>
Component: Drivers/DRI/swrastAssignee: Mathias Fröhlich <Mathias.Froehlich>
Status: RESOLVED FIXED QA Contact:
Severity: normal    
Priority: medium    
Version: git   
Hardware: Other   
OS: All   
Whiteboard:
i915 platform: i915 features:

Description Ian Romanick 2012-04-16 15:20:22 UTC 
Retail Doom3 on swrast (classic, I haven't tried softpipe or llvmpipe) generates an endless stream of messages like

Mesa warning: glDrawElements() index=895 is out of bounds (max=4)
Mesa warning: glDrawElements() index=39 is out of bounds (max=4)
Mesa warning: glDrawElements() index=39 is out of bounds (max=4)
Mesa warning: glDrawElements() index=196 is out of bounds (max=4)
Mesa warning: glDrawElements() index=571 is out of bounds (max=4)
Mesa warning: glDrawElements() index=17 is out of bounds (max=4)
Mesa warning: glDrawElements() index=67 is out of bounds (max=4)
Mesa warning: glDrawElements() index=38 is out of bounds (max=4)
Mesa warning: glDrawElements() index=1606 is out of bounds (max=4)

I have bisected this to:

commit 7a1e941ebee43cb97a2c77fd2269999b202308a2
Author: Mathias Fröhlich <Mathias.Froehlich@web.de>
Date:   Thu Dec 29 13:10:01 2011 +0100

    mesa: Fix and speedup gl_array_object::_MaxElement computation.
    
    Use a bitmask approach to compute gl_array_object::_MaxElement.
    To make this work correctly depending on the shader type actually used,
    make use of the newly introduced typed bitmask getters.
    With this change I gain about 5% draw time on some osgviewer examples.
    
    Signed-off-by: Mathias Fröhlich <Mathias.Froehlich@web.de>
    Reviewed-by: Brian Paul <brianp@vmware.com>
Comment 1 Mathias Fröhlich 2018-04-25 06:52:13 UTC 
The VAO _MaxElement computations, including the warning in question, have been removed with commit 26ee6f23a9aec6b1f392baa0e3f1f2c62c038a57.

I do not have doom3 available here to test, but I strongly guess that this should make the warning vanish finally.

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