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According to the GLSL spec, if the user uses the fma() intrinsic to generate a precise-consumed value, and you have it in your hardware, you shouldn't split it. For a while now, we've been splitting all ffma's up-front and then planned to fuse them later which isn't valid. Correctly handling the GLSL behaviour fixes rendering corruptions in Tomb Raider. The only reason why doing this possibly helped before was for ARB programs which is handled by the previous commit. Shader-db results on Haswell: total instructions in shared programs: 7560300 -> 7561510 (0.02%) instructions in affected programs: 56265 -> 57475 (2.15%) helped: 86 HURT: 291 The only shaders in the database that are affected are from "Shadow of Mordor" which is the first app in our database to use fma(). We could, at some point in the future, split inexact ffma opcodes which would fix the shader-db regressions since Shadow of Mordor doesn't ues precise. However, this fixes a bug now and and the shader-db impact is fairly small. Reported-by: Kenneth Graunke <kenneth@whitecape.org> Cc: "11.1 11.2" <mesa-stable@lists.freedesktop.org> Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> |
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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 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.