Kenneth Graunke
134728fdae
Normally, we rely on nir_lower_outputs_to_temporaries to create shadow variables for outputs, buffering the results and writing them all out at the end of the program. However, this is infeasible for tessellation control shader outputs. Tessellation control shaders can generate multiple output vertices, and write per-vertex outputs. These are arrays indexed by the vertex number; each thread only writes one element, but can read any other element - including those being concurrently written by other threads. The barrier() intrinsic synchronizes between threads. Even if we tried to shadow every output element (which is of dubious value), we'd have to read updated values in at barrier() time, which means we need to allow output reads. Most stages should continue using nir_lower_outputs_to_temporaries(), but in theory drivers could choose not to if they really wanted. v2: Rebase to accomodate Jason's review feedback. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.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.