Ville Syrjälä
0eef03a6f2
Unlike the older gen2 hardware, gen3 performs perspective correct interpolation even for the primary/secondary colors. To do that it naturally needs us to emit W for the vertices. Currently we emit W only when at least one texture coordinate set gets emitted. This means the interpolation of color will change depending on whether texcoords/varyings are used or not. That's probably not what anyone would expect, so let's just always emit W to get consistent behaviour. Trying to avoid emitting W seems like more hassle than it's worth, especially as bspec seems to suggest that the hardware will perform the perspective division anyway. This used to be broken until it was accidentally fixed it in commitc349031c27("i915: Fix texcoord vs. varying collision in fragment programs") by introducing a bug that made the driver always emit W. After fixing that bug in commitc1eedb43f3("i915: Fix wpos_tex vs. -1 comparison") we went back to the old behaviour and caused an apparent regression. Fixes:c1eedb43f3("i915: Fix wpos_tex vs. -1 comparison") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101451 Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Ian Romanick <ian.d.romanick@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 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.