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@lists.freedesktop.org ReportedBy: edwintorok@gmail.com CC: brianp@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@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?)