Roland Scheidegger
b936f4d1ca
The hw gives us coverage for pixel, not for individual fragment shader invocations, in case execution isn't per pixel (eg, unlike cm, actually cannot do "real" minSampleShading, it's either per-pixel or per-fragment, but it doesn't really make a difference here). Also, with msaa disabled, the hw still gives us a mask corresponding to the number of samples, where GL requires this to be 1. Fix this up by masking the sampleMaskIn bits with the bit corresponding to the sampleID, if we know this shader is always executed at per-sample granularity. (In case of a per-sample frequency shader and msaa disabled, the sampleID will always be 0, so this works just fine there.) Fixing this for the minSampleShading case will need a shader key (radeonsi uses the prolog part for) (for eg, could get away with a single bit, cm would need more bits depending on sample/invocation ratio, or read the bits from a uniform), unless we'd want to always use a sample mask uniform (which is probably not a good idea, as it would make the ordinary common msaa case slower for no good reason). This fixes some parts of piglit arb_sample_shading-samplemask (with fixed test), in particular those which use a sampleID, still failing others as expected. Reviewed-by: Dave Airlie <airlied@redhat.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 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.