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In "manual" derivative mode (always used on nv50 and sometimes on nvc0 but always for cube), the idea is that using the quadop instruction, we set up the "other" quads to have values such that the derivatives work out, and then run the texture instruction as if nothing were strange. It pulls values from the other lanes, and does its magic. However cube coordinates have to be normalized - one of the 3 coords has to be 1, to determine which is the major axis, to say which face is being sampled. We were normalizing the coordinates first, and then adding the derivatives. This is wrong for two reasons: - the coordinates got normalized by a scaling factor but the derivatives didn't - the result of the addition didn't end up normalized To resolve this, we flip the logic around to normalize *after* the per-lane coordinates are set up. This fixes a bunch of textureGrad cube dEQP tests. NOTE: nv50 cube arrays with explicit derivatives are still broken, to be resolved at a later date. Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu> Cc: "11.1 11.2" <mesa-stable@lists.freedesktop.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.