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The main motivation is to enable HDC surface opcodes on ICL which no longer allows the sample mask to be provided in a message header, but this is enabled all the way back to IVB when possible because it decreases the instruction count of some shaders using HDC messages significantly, e.g. one of the SynMark2 CSDof compute shaders decreases instruction count by about 40% due to the removal of header setup boilerplate which in turn makes a number of send message payloads more easily CSE-able. Shader-db results on SKL: total instructions in shared programs: 15325319 -> 15314384 (-0.07%) instructions in affected programs: 311532 -> 300597 (-3.51%) helped: 491 HURT: 1 Shader-db results on BDW where the optimization needs to be disabled in some cases due to hardware restrictions: total instructions in shared programs: 15604794 -> 15598028 (-0.04%) instructions in affected programs: 220863 -> 214097 (-3.06%) helped: 351 HURT: 0 The FPS of SynMark2 CSDof improves by 5.09% ±0.36% (n=10) on my SKL laptop with this change. According to Eero this improves performance of the same test by 9% on BYT and by 7-8% on BXT J4205 and on SKL GT2 desktop. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Tested-By: Eero Tamminen <eero.t.tamminen@intel.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 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.