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If the tri is fully inside a scissor edge (or rather, we just use the bounding box of the tri for the comparison), then we can drop these additional scissor "planes" early. We do not even need to allocate space for them in the tri. The math actually appears to be slightly iffy due to bounding boxes being rounded, but it doesn't matter in the end. Those scissor rects are costly - the 4 planes from the scissor are already more expensive to calculate than the 3 planes from the tri itself, and it also prevents us from using the specialized raster code for small tris. This helps openarena performance by about 8% or so. Of course, it helps there that while openarena often enables scissoring (and even moves the scissor rect around) I have not seen a single tri actually hit the scissor rect, ever. v2: drop individual scissor edges, and do it earlier, not even allocating space for them. v3: help the compiler a bit with simpler code, suggested by Brian. Reviewed-by: Brian Paul <brianp@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 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.