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81cfcdbd87
While a sqrt here and there shouldn't hurt much (depending on the cpu) it is possible to completely omit it since rho is only used for calculating lod and there log2(x) == 0.5*log2(x^2). Depending on the exact path taken for calculating lod this means we get a simple mul instead of sqrt (in case of nearest mip filter in fact we don't need to replace the sqrt with something else at all), only in some not very useful path this doesn't work (combined brilinear calculation of int level and fractional lod, accurate rho calc but brilinear filtering seems odd). Apart from being faster as an added bonus this should increase our crappy fractional accuracy of lod, since fast_log2 is only good for ~3bits and this should increase accuracy by one bit (though not used if dimension is just one as we'd need an extra mul there as we never had the squared rho in the first place). v2: use separate ilog2_sqrt function if we have squared rho. Reviewed-by: Jose Fonseca <jfonseca@vmware.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 mesagdi to build classic mesa Windows GDI drivers; 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. 1) install python 2.7 2) install scons (latest) 3) install mingw, flex, and bison 4) install libxml2 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get libxml2-python-2.9.1.win-amd64-py2.7.exe 5) install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe 6) install git 7) download mesa from git see http://www.mesa3d.org/repository.html 8) 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.