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List:       mesa3d-dev
Subject:    [Mesa3d-dev] [Bug 7586]  New: Error while linking Shader object
From:       bugzilla-daemon () annarchy ! freedesktop ! org
Date:       2006-07-21 14:06:45
Message-ID: 20060721140645.48A73130067 () annarchy ! freedesktop ! org
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https://bugs.freedesktop.org/show_bug.cgi?id=7586          
     
           Summary: Error while linking Shader object
           Product: Mesa
           Version: 6.5
          Platform: PC
        OS/Version: Windows XP
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Mesa core
        AssignedTo: mesa3d-dev@lists.sourceforge.net
        ReportedBy: mti@ashampoo.com


I have a simple Fragment shader ( works with ati / nvidia drivers ), thats
breaking mesa.

In the file mesa-6.5\src\mesa\shader\shaderobjects_3dlabs.c on line 810 it says

		obj = impl->_obj._container.attached[i];	// Refcounts: obj == 1, unk == 0, sha
== 0
		unk = (**obj)._unknown.QueryInterface ((struct gl2_unknown_intf **) obj,
UIID_SHADER); // Refcounts: obj == 2, unk == obj, sha == 0
		(**obj)._unknown.Release ((struct gl2_unknown_intf **) obj); // Refcounts: obj
== 1, unk == obj, sha == 0
		if (unk == NULL)
			return;
		sha = (struct gl2_shader_impl *) unk; // Refcounts: obj == 1, unk == obj, sha
== unk
		units[i] = &sha->_obj.unit; 
		(**unk).Release (unk); // Refcounts: obj == 0, unk == null, sha == null AND
units[i] == 0 !!!!!

I added The reference counts as comments as they are on my machine. The problem
as you might have already seen is that units[i] is invalid after the last
Release and therefor I get access violations some functions later.          
     
     
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