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The SSSE3 swizzling code was written for fast uploads to the GPU and assumed the destination was always 16-byte aligned. When we began using this code for fast downloads as well we didn't do anything to account for the fact that the destination pointer given by glReadPixels() or glGetTexImage() is not guaranteed to be suitably aligned. With SSSE3 enabled (at compile-time), some applications would crash when an SSE aligned-store instruction tried to store to an unaligned destination (or an assertion that the destination is aligned would trigger). To remedy this, tell intel_get_memcpy() whether we're uploading or downloading so that it can select whether to assume the destination or source is aligned, respectively. Cc: 10.5 <mesa-stable@lists.freedesktop.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89416 Tested-by: Uriy Zhuravlev <stalkerg@gmail.com> Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com> |
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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 osmesa to build classic osmesa driver; or 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.