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This behaviour was changed in1e5b09f42f. The commit message for that says it is just a “tidy up” so my assumption is that the behaviour change was a mistake. It’s a little hard to decipher looking at the diff, but the previous code before that patch was: if (builtin == SpvBuiltInFragCoord || builtin == SpvBuiltInSamplePosition) nir_var->data.origin_upper_left = b->origin_upper_left; if (builtin == SpvBuiltInFragCoord) nir_var->data.pixel_center_integer = b->pixel_center_integer; After the patch the code was: case SpvBuiltInSamplePosition: nir_var->data.origin_upper_left = b->origin_upper_left; /* fallthrough */ case SpvBuiltInFragCoord: nir_var->data.pixel_center_integer = b->pixel_center_integer; break; Before the patch origin_upper_left affected both builtins and pixel_center_integer only affected FragCoord. After the patch origin_upper_left only affects SamplePosition and pixel_center_integer affects both variables. This patch tries to restore the previous behaviour by changing the code to: case SpvBuiltInFragCoord: nir_var->data.pixel_center_integer = b->pixel_center_integer; /* fallthrough */ case SpvBuiltInSamplePosition: nir_var->data.origin_upper_left = b->origin_upper_left; break; This change will be important for ARB_gl_spirv which is meant to support OriginLowerLeft. Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com> Fixes:1e5b09f42f"spirv: Tidy some repeated if checks..."
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 https://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.