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According to GLSL, the shader may call EndPrimitive() at any point during its execution, causing the line or triangle strip currently being output to be terminated and a new strip to be begun. This is implemented in gen7 hardware by using one control data bit per vertex, to indicate whether EndPrimitive() was called after that vertex was emitted. In order to make this work without sacrificing too much efficiency, we accumulate 32 control data bits at a time in a GRF. When we have accumulated 32 bits (or when the shader terminates), we output them to the appropriate DWORD in the control data header and reset the accumulator to 0. We have to take special care to make sure that EndPrimitive() calls that occur prior to the first vertex have no effect. Since geometry shaders that output a large number of vertices are likely to be rare, an optimization kicks in if max_vertices <= 32. In this case, we know that we can wait until the end of shader execution before any control data bits need to be output. I've tried to write the code in such a way that in the future, we can easily adapt it to output stream ID bits (which are two bits/vertex instead of one). Fixes piglit tests "spec/glsl-1.50/glsl-1.50-geometry-end-primitive *". Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> |
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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.