Kenneth Graunke
13195f7ef8
Often, we don't need a full 4 channels worth of data from the sampler. For example, depth comparisons and red textures only return one value. To handle this, the sampler message header contains a mask which can be used to disable channels, and reduce the message length (in SIMD16 mode on all hardware, and SIMD8 mode on Broadwell and later). We've never used it before, since it required setting up a message header. This meant trading a smaller response length for a larger message length and additional MOVs to set it up. However, Skylake introduces a terrific new feature: for headerless messages, you can simply reduce the response length, and it makes the implicit header contain an appropriate mask. So to read only RG, you would simply set the message length to 2 or 4 (SIMD8/16). This means we can finally take advantage of this at no cost. total instructions in shared programs: 9091831 -> 9073067 (-0.21%) instructions in affected programs: 191370 -> 172606 (-9.81%) helped: 2609 HURT: 0 total cycles in shared programs: 70868114 -> 68454752 (-3.41%) cycles in affected programs: 35841154 -> 33427792 (-6.73%) helped: 16357 HURT: 8188 total spills in shared programs: 3492 -> 1707 (-51.12%) spills in affected programs: 2749 -> 964 (-64.93%) helped: 74 HURT: 0 total fills in shared programs: 4266 -> 2647 (-37.95%) fills in affected programs: 3029 -> 1410 (-53.45%) helped: 74 HURT: 0 LOST: 1 GAINED: 143 Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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.