[Bug 29263] shadowtex: r700_assembler.c:6355: Process_Export: Assertion `starting_register_number >= pAsm->starting_export_register_number' failed.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29263

--- Comment #1 from Török Edwin <edwintorok at gmail.com> 2010-07-26 08:12:42 PDT ---
(In reply to comment #0)
> Created an attachment (id=37398)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37398)
> glxinfo, Xorg.0.log, dmesg
> 
> I just started shadowtex today and got this assertion failure.
> ./shadowtex 
> Using GL_ARB_depth_texture
> and GL_ARB_shadow
> and GL_ARB_fragment_program
> and GL_ARB_shadow_ambient
> Using GL_EXT_framebuffer_object
> Keys:
>   a = toggle animation
>   i = show depth texture image
>   m = show depth texture mapping
>   d = show fragment distance from light source
>   n = show normal, shadowed image
>   f = toggle nearest/bilinear texture filtering
>   b/B = decrease/increase shadow map Z bias
>   p = toggle use of packed depth/stencil
>   M = cycle through fragment program modes
>   v = toggle vertex program modes
>   cursor keys = rotate scene
>   <shift> + cursor keys = rotate light source
>   o = cycle through comparison modes
> Rendering 256 x 256 depth texture
> shadowtex: r700_assembler.c:6355: Process_Export: Assertion
> `starting_register_number >= pAsm->starting_export_register_number' failed.
> Aborted
> 
> Steps to reproduce:
> 1 Build mesa for r600:
> $ ./configure --prefix=/opt/xorg --with-dri-drivers=r600,swrast
> --disable-gallium --with-dri-driverdir=/opt/xorg/lib/dri --enable-glx-tls
> PKG_CONFIG_PATH=/opt/xorg/lib/pkgconfig/
> $ make clean
> $ make -j8
> $ make install
> 2 Run shadowtex demo
> $ cd /path/to/mesa/demos
> $ ./shadowtex
> 
> I remember shadowtex working at some point (and works with 7.8.x). "Works" in
> the sense that it renders something, the shadow texture itself is random (see
> bug #26735). But it was certainly not aborting.
> So I did a git bisect and it came up with this:
> 
> b6b9b17d27c570cc99ae339e595cf2f63ca5e8d7 is the first bad commit
> commit b6b9b17d27c570cc99ae339e595cf2f63ca5e8d7
> Author: Brian Paul <brianp at vmware.com>
> Date:   Fri Jul 2 08:14:54 2010 -0600
> 
>     mesa: make the number of draw buffers part of the texenv program key state
> 
>     All the state that effects the program should be in the key.
>     This didn't help with bug 28169 but is a good fix anyway.
> 
>     NOTE: this is a low-priority candidate for the 7.8 branch.  In practice,
>     this issue might never be hit.
> 
> :040000 040000 c9f1d363565e225cdf17e57993b6a773a46107c5
> 3e22c4d9a51ba9b569ee72ba2fa2a1186f41a30d M      src
> 
> Reverting that patch makes it work again.

reverting in the sense of checking out its parent, 'git revert' can't cleanly
revert that patch (I get build error).

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