Roland Scheidegger
6e7ce1ef55
This special packing path can be easily extended to handle not just float->unorm8 but also float->snorm8 and uint32->uint8 and int32->int8 (i.e. all interesting cases for llvmpipe fs backend code). The packing parts all stay the same (only the last step packing will be signed->signed instead of signed->unsigned but luckily even sse2 can do both). While here also note some bugs with that (we keep the bugs identical to what we did before on x86, albeit other archs may differ). In particular float->unorm8 too large values will still get clamped to 0, not 255, and for float->snorm8 NaNs will end up as -1, not 0 (but we do the clamp against 1.0 there to prevent too large values ending up as -1.0 - this is inconsistent to unorm8 handling but is what we ended up before, I'm not sure we can get away without it). This is quite fishy in any case as we depend on arch-dependent behavior of the iround (my understanding is in fact with altivec the conversion would actually saturate although I've no idea about NaNs, so probably wouldn't need to do anything for snorm). (There are only minimal piglit tests for unorm clamping behavior AFAICT, in particular nothing seems to test values which are too large to be handled by the float->int conversion.) For uint32->uint8 we also do a min against MAX_INT, since the source for the packs is always signed (again, on x86 - should probably be able to express these arch-dependent bits better some day). Reviewed-by: Jose Fonseca <jfonseca@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 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.