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The previous code relied on cpu denorm support for converting small float formats (such r11g11b10_float and r16_float) to floats, otherwise denorms are flushed to zero. We worked around that in llvmpipe blend code by reenabling denorms, but this did nothing for texture sampling. Now it would be possible to reenable it there too but I'm not really a fan of messing with fpu flags (and it seems we can't actually do it reliably with llvm in any case looking at some bug reports). (Not to mention if you actually have a lot of denorms in there, you can expect some order-of-magnitude slowdown with x86 cpus.) So instead use code which adjusts exponents etc. directly hence not relying on cpu denorm support for the rescaling mul. (We still need the fpu flag handling as we can't do float-to-smallfloat without using cpu denorms at least for now - I actually wanted to keep both the old and new code and using one or the other depending on from where it's called but that didn't work out as the parameter would have to be passed through too many layers than I'd like.) Reviewed-by: Zack Rusin <zackr@vmware.com> Reviewed-by: Si Chen <sichen@vmware.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 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.