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Instead of skipping x/y clipping completely if there's point_tri_clip points use guard band clipping. This should be easier (previously we could not disable generating the x/y bits in the clip mask for llvm path, hence requiring custom clip path), and it also allows us to enable this for tris-as-points more easily too (this would require custom tri clip filtering too otherwise). Moreover, some unexpected things could have happen if there's a NaN or just a huge number in some tri-turned-point, as the driver's rasterizer would need to deal with it and that might well lead to undefined behavior in typical rasterizers (which need to convert these numbers to fixed point). Using a guardband should hence be more robust, while "usually" guaranteeing the same results. (Only "usually" because unlike hw guardbands draw guardband is always just twice the vp size, hence small vp but large points could still lead to different results.) Unfortunately because the clipmask generated is completely unaffected by guard band clipping, we still need a custom clip stage for points (but not for tris, as the actual clipping there takes guard band into account). Reviewed-by: Jose Fonseca <jfonseca@vmware.com> |
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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.