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Constant propagation on arrays doesn't make a lot of sense. If the array is only accessed with constant indexes, then opt_array_splitting would split it up. Otherwise, we have variable indexing. If there's multiple accesses, then constant propagation would end up replicating the data. The lower_const_arrays_to_uniforms pass creates uniforms for each ir_constant with array type that it encounters. This means that it creates redundant uniforms for each copy of the constant, which means uploading too much data. It can even mean exceeding the maximum number of uniform components, causing link failures. We could try and teach the pass to de-duplicate the data by hashing constants, but it makes more sense to avoid duplicating it in the first place. We should promote constant arrays to uniforms, then propagate the uniform access. Fixes the TressFX shaders from Tomb Raider, which exceeded the maximum number of uniform components by a huge margin and failed to link. On Broadwell: total instructions in shared programs: 9067702 -> 9068202 (0.01%) instructions in affected programs: 10335 -> 10835 (4.84%) helped: 10 (Hoard, Shadow of Mordor, Amnesia: The Dark Descent) HURT: 20 (Natural Selection 2) loops in affected programs: 4 -> 0 The hurt programs appear to no longer have a constarray uniform, as all constants were successfully propagated. Apparently before this patch, we successfully unrolled a loop containing array access, but only after promoting constant arrays to uniforms. With this patch, we unroll it first, so all array access is direct, and the array is split up, and individual constants are propagated. This seems better. Cc: mesa-stable@lists.freedesktop.org Reported-by: Karol Herbst <nouveau@karolherbst.de> Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Timothy Arceri <timothy.arceri@collabora.com>
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 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.