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When rendering to an fbo, even though it may be acting as a winsys frontbuffer or just generally, we never throttle. However, when rendering to an fbo, there is no natural frame boundary. Conventionally we use SwapBuffers and glFinish, but potential callers avoid often glFinish for being too heavy handed (waiting on all outstanding rendering to complete). The kernel provides a soft-throttling option for this case that waits for rendering older than 20ms to be complete (that's a little too lax to be used for swapbuffers, but is here a useful safety net). The remaining choice is then either never to throttle, throttle after every draw call, or at after intermediate user defined point such as glFlush and thus all the implied flushes. This patch opts for the latter as that is the current method used for flushing to front buffers. v2: Defer the throttling from inside the flush to the next intel_prepare_render() and switch non-fbo frontbuffer throttling over to use the same lax method. The issuing being that glFlush()/intel_prepare_read() is just as likely to be called inside a tight loop and not at "frame" boundaries. v3: Rename from need_front_throttle to need_flush_throttle to avoid any ambiguity between front buffer rendering and fbo rendering. (Chad) v4: Whitespace Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Kenneth Graunke <kenneth@whitecape.org> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Kristian Høgsberg <krh@bitplanet.net> Cc: Chad Versace <chad.versace@linux.intel.com> Cc: Ian Romanick <idr@freedesktop.org> Reviewed-by: Chad Versace <chad.versace@linux.intel.com> |
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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 to build classic osmesa driver; 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. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see http://www.mesa3d.org/repository.html - 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.