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Hardware contexts greatly simplify the query object code. The pipeline statistics counters get saved and restored with the context, which means that we don't need to worry about other workloads polluting them. This means that we can simply write a single pair of values (one at BeginQuery and one at EndQuery) rather than a series of pairs. This also means we don't need to worry about the BO getting full. We also don't need to delay BO allocation and starting snapshot until the first draw. The generation split here is a little off: technically, Ironlake can also support hardware contexts. However, the kernel currently doesn't, and even if it were to do so someday, we'd need to wait a while before bumping the kernel requirement to take advantage of it. v2: Incorporate Paul's feedback. - Clarify which functions are Gen4/5-only via assertions and comments. - Change how driver hook initialization happens. - Update comments. - Squash a bug fix from a later commit here where it belongs. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net> [v1] Acked-by: Paul Berry <stereotype441@gmail.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.