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This is not enabled on the original Gen4 part because it lacks surface state tile offsets so it may not be possible to sample from arbitrary non-zero layers of the framebuffer depending on the miptree layout (it should be possible to work around this by allocating a scratch surface and doing the same hack currently used for render targets, but meh...). On Gen9+ even though it should mostly work (feel free to force-enable it in order to compare the coherent and non-coherent paths in terms of performance), there are some corner cases like 1D array layered framebuffers that cannot be handled easily by the non-coherent path because of the incompatible layout in memory of 1D and 2D miptrees (it should be possible to work around this too by doing state-dependent recompiles, but it's hard to care enough since Gen9 has native support for coherent render target reads...) Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
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.