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On modern systems with 4GB apertures, the size in bytes is 4294967296, or (1ull << 32). The kernel gives us the aperture size as a __u64, which works out great. Unfortunately, libdrm "helpfully" returns the data as a size_t, which on 32-bit systems means it truncates the aperture size to 0 bytes. We've happily reported this value as 0 MB of video memory via GLX_MESA_query_renderer since it was originally exposed. This patch bypasses libdrm and calls the ioctl ourselves so we can use a proper uint64_t, avoiding the 32-bit integer overflow. We now report a proper video memory size on 32-bit systems. Chris points out that the aperture size (CPU mappable size limit) isn't really the right thing to be checking. But libdrm_intel uses it to fail execbuffer, so it is an actual limit for now. Once that's fixed we can probably move to something else. In the meantime, fix the obvious typecasting bug. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> |
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| appveyor.yml | ||
| autogen.sh | ||
| CleanSpec.mk | ||
| common.py | ||
| configure.ac | ||
| install-gallium-links.mk | ||
| install-lib-links.mk | ||
| Makefile.am | ||
| REVIEWERS | ||
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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 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.