[Bug 29263] New: 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

           Summary: shadowtex: r700_assembler.c:6355: Process_Export:
                    Assertion `starting_register_number >=
                    pAsm->starting_export_register_number' failed.
           Product: Mesa
           Version: git
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/R600
        AssignedTo: dri-devel at lists.freedesktop.org
        ReportedBy: edwintorok at gmail.com
                CC: brianp at vmware.com


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.
I don't know if there a bug in that patch, or it exposed another bug (maybe
even the bug that caused the random texture in the first place?)

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