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The L3 partitioning code tries to look at all programs - both render programs (VS/TCS/TES/GS/FS) and compute (CS). After calling brw_clear_cache, all prog_data pointers are invalid and point to freed data. The intention was that flagging the dirty bits for all programs would cause the next draw call to re-run the atoms for each program stage, uploading new programs and installing new, valid pointers. However, this doesn't quite work in our new multi-pipeline world. When drawing or dispatching a compute workload, we only consider the programs for the appropriate pipeline: drawing sets up VS/TCS/TES/GS/FS, but not CS, and vice versa. This leaves pointers dangling a bit longer than intended. The L3 configuration code tries to inspect the prog_data for all shader stages, so that we avoid having to reconfigure it when swapping back and forth between render and compute workloads. So we can't have dangling pointers. The fix is simple: have brw_clear_cache NULL out stale prog_data pointers, making it safe to inspect. The next L3 configuration pass will see either the render shaders or compute shader as missing for one go around, but will pick them up when both pipelines have run. In other words, we'll simply reconfigure L3 twice, which is safe, if a tiny bit wasteful - but then again, we just threw every compiled shader we had on the floor and started recompiling the from scratch, which is massively more wasteful, so it's not much of a concern. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93790 Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Francisco Jerez <currojerez@riseup.net> Reviewed-by: Jordan Justen <jljusten@gmail.com>
File: docs/README.WIN32 Last updated: 21 June 2013 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons libgl-gdi to build gallium based GDI driver. This will work both with MSVS or Mingw. Windows Drivers ------- ------- At this time, only the gallium GDI driver is known to work. Source code also exists in the tree for other drivers in src/mesa/drivers/windows, but the status of this code is unknown. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see http://www.mesa3d.org/repository.html - run scons General ------- After building, you can copy the above DLL files to a place in your PATH such as $SystemRoot/SYSTEM32. If you don't like putting things in a system directory, place them in the same directory as the executable(s). Be careful about accidentially overwriting files of the same name in the SYSTEM32 directory. The DLL files are built so that the external entry points use the stdcall calling convention. Static LIB files are not built. The LIB files that are built with are the linker import files associated with the DLL files. The si-glu sources are used to build the GLU libs. This was done mainly to get the better tessellator code. If you have a Windows-related build problem or question, please post to the mesa-dev or mesa-users list.