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We want to emit invariant state at the start of a render batch. In the past, this more or less happened: a new batch flagged BRW_NEW_CONTEXT (because we don't have hardware contexts), which triggered the brw_invariant_state atom. So, it would be emitted before any 3D drawing. (Technically, there might be some BLT commands in the batch because Gen4-5 have a single combined render/BLT ring, but that should be harmless). With the advent of BLORP, this broke. The first item in a batch might be a BLORP operation, which bypasses the normal draw upload path. So, we need to ensure invariant state happens first. To do that, we just upload it when creating a new batch. On Gen6+ we'd need to worry about whether it's a RENDER or BLT batch, but because we have a combined ring, this approach should work fine on Gen4-5. Seems to fix GPU hangs when playing hardware accelerated video with mpv -hwdec=vaapi on Ironlake. Cc: mesa-stable@lists.freedesktop.org Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=103529 Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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 https://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.