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Using the push model for inputs is much more efficient than pulling inputs - the hardware can simply copy a large chunk into URB registers at thread creation time, rather than having the thread send messages to request data from the L3 cache. Unfortunately, it's possible to have more TES inputs than fit in registers, so we have to fall back to the pull model in some cases. However, it turns out that most tessellation evaluation shaders are fairly simple, and don't use many inputs. An arbitrary cut-off of 32 vec4 slots (16 registers) is more than sufficient to ensure that 100% of TES inputs are pushed for Shadow of Mordor, Unigine Heaven, GPUTest/TessMark, and SynMark. Note that unlike most SIMD8 stages, this actually reads packed vec4 data, since that is what our vec4 TCS programs write. Improves performance in GPUTest's tessmark_x64 microbenchmark by 93.4426% +/- 5.35541% (n = 25) on my Lenovo X250 at 1024x768. Improves performance in Synmark's Gl40TerrainFlyTess microbenchmark by 22.74% +/- 0.309394% (n = 5). Improves performance in Shadow of Mordor at low settings with tessellation enabled at 1280x720 by 2.12197% +/- 0.478553% (n = 4). shader-db statistics for files containing tessellation shaders: total instructions in shared programs: 184358 -> 181181 (-1.72%) instructions in affected programs: 27971 -> 24794 (-11.36%) helped: 226 Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Matt Turner <mattst88@gmail.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.