9945573d65
The documentation makes it pretty clear that we shouldn't use this:
"Under normal conditions SW shall specify DMask, as the GS stage
will provide a Dispatch Mask appropriate to SIMD4x2 or SIMD8 thread
execution (as a function of dispatch mode). E.g., for SIMD4x2
execution, the GS stage will generate a Dispatch Mask that is equal
to what the EU would use as the Vector Mask. For SIMD8 execution
there is no known usage model for use of Vector Mask (as there is
for PS shaders)."
I also managed to find descriptions of DMask and VMask, in the "State
Register" (sr0.2/3) field descriptions:
"Dispatch Mask (DMask). This 32-bit field specifies which channels
are active at Dispatch time."
"Vector Mask (VMask). This 32-bit field contains, for each 4-bit
group, the OR of the corresponding 4-bit group in the dispatch
mask."
SIMD4x2 shaders process one or two vec4 values, with each 4-bit group
corresponding to xyzw channel enables (either all on, or all off).
Thus, DMask = VMask in SIMD4x2 mode. But in SIMD8 mode, 4-bit groups
are meaningless, so it just messes up your values.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
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.