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Precompiling the shader at link time often allows us to avoid compiling it at the first use. This moves the expensive compilation and optimization process to game or level load time, rather than at draw time, where we really can't avoid any cycles and don't want to risk stalling the GPU. The downside is that we have to guess the non-orthagonal state the program will have set when it draws with the shader. Previously, we guessed wrong for nearly every shader, so it wasn't useful. With the recent SamplerUnits rework and this series, we've either eliminated state or made smarter guesses, and usually get it right now. In the L4D2 time demo, I now have 39 fragment shader recompiles and no vertex shader recompiles. Before this series and the SamplerUnits rework, I had 206 fragment shader recompiles and 192 vertex shader recompiles. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net> |
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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.