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88637e5764
The previous method for converting coords to ints was sligthly inaccurate (effectively losing 1bit from the 8bit lerp weight). This is probably especially noticeable when trying to draw a pixel-aligned texture. As an example, for a 100x100 texture after dernormalization the texture coords in this case would turn up as 0.5, 1.5, 2.5, 3.5, 4.5, ... After the mul by 256, conversion to int and 128 subtraction, they end up as 0, 256, 512, 768, 1024, ... which gets us the correct coords/weights of 0/0, 1/0, 2/0, 3/0, 4/0, ... But even LSB errors (which are unavoidable) in the input coords may cause these coords/weights to be wrong, e.g. for a coord of 3.49999 we'd get a coord/weight of 2/255 instead. Fix this by using round-to-nearest int instead of FPToSi (trunc). Should be equally fast on x86 sse though other archs probably suffer a little. |
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| common.py | ||
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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.