Kenneth Graunke
44fd85d8eb
A while ago, I made i965 start compiling shaders independently. The VUE map layouts were based entirely on each shader's input/output bitfields. Assuming the interfaces match, this works out well - both sides will compute the same layout, and outputs are correctly routed to inputs. At the time, I had assumed that the linker would guarantee that the interfaces match. While it usually succeeds, it unfortunately seems to fail in some cases. For example, Piglit's tcs-input-read-array-interface test has a VS output array with two elements, but the TCS only reads one. The linker isn't able to eliminate the unused element from the VS, which makes the interfaces not match. Another case is where a shader other than the last writes clip/cull distances. These should be demoted to ordinary varyings, but they currently aren't - so we think they still have some special meaning, and prevent them from being eliminated. Fixing the linker to guarantee this in all cases is complicated. It needs to be able to optimize out dead code. It's tied into varying packing and other messiness. While we can certainly improve it---and should---I'd rather not rely on it being correct in all cases. This patch ORs adjacent stages' input/output bitfields together, ensuring that their interface (and hence VUE map layout) will be compatible. This should safeguard us against linker insufficiencies. Fixes line rendering in Dolphin, and the Piglit test based on it: spec/glsl-1.50/execution/geometry/clip-distance-vs-gs-out. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97232 Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Timothy Arceri <timothy.arceri@collabora.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.