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A temporary texture is created such that it matches the format and type combination and pixels are copied to it using memcpy. Then the blit is used to copy the temporary texture to the texture image being modified by TexImage or TexSubImage. The blit takes care of the format and type conversion and swizzling. The result is a very fast texture upload involving as little CPU as possible. This improves performance in apps which upload textures during rendering. An example is the Wine OpenGL backend for DirectDraw, which I used to test the game StarCraft. Profiling had shown that TexSubImage was taking 50% of CPU time without this patch, which was the main motivation for this work, and now TexSubImage only takes 14% of CPU time. I had to underclock my CPU to see any difference in the game and this patch does make the game a lot faster if the CPU is slow (or using the powersave cpufreq profile). Reviewed-by: Brian Paul <brianp@vmware.com> |
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File: docs/README.WIN32 Last updated: 23 April 2011 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. 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.