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This was meant for softpipe to not crash at some point if vertex texturing was used. It is, however, fishy because it uses values from draw_set_samplers/draw_set_sampler_views and not from the shader key. Albeit we should still in all cases actually generate a new shader if this changes (because the samplers and views themselves are in the key) I don't want to think again wondering if that's really correct in the future. Besides, at least today, it does not actually work for softpipe, as this was relying on softpipe not actually calling draw_set_samplers/sampler_views at all - I've verified it crashes regardless (if there were a tex instruction in the vs, which normally should not happen anyway). For drivers which do indeed not call these functions because they don't support vertex texturing at all (r300), this should still not crash because the static texture data is all zero, which causes the sampling functions to take an early out (same as is done if no texture is bound at the slot used for sampling - verified with hacked up softpipe). Reviewed-by: Jose Fonseca <jfonseca@vmware.com> |
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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 osmesa mesagdi to build classic mesa Windows GDI drivers; or 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.