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Before, we had an uncached read of S8 to untile, then a RMW (so uncached penalty) of the packed S8Z24 to store the value, then the consumer would uncached read that once per pixel. If data was written to the map, we would then have to uncached read the written data back out and do the scatter to the tiled S8 buffer (also uncached access penalties, since WC couldn't actually combine). So 3 or 5 uncached accesses per pixel in the ROI (and we we were ignoring the ROI, so it was the whole image). Now we get an uncached read of S8 to untile, and an uncached read of Z. The consumer gets to do cached accesses. Then if data was written, we do streaming Z writes (WC success), and scattered S8 tiling writes (uncached penalty). So 2 or 3 uncached accesses per pixel in the ROI. This should be a performance win, to the extent that anybody is doing software accesses of packed depth/stencil buffers. Reviewed-by: Chad Versace <chad.versace@linux.intel.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.