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The brw_stage_prog_data struct previously contained an array of float pointers to the values of parameters. These were then copied into a batch buffer to upload the values using a regular assignment. However the float values were also being overloaded to store integer values for integer uniforms. This can break if x87 floating-point registers are used to do the assignment because the fst instruction tries to fix up invalid float values. If an integer constant happened to look like an invalid float value then it would get altered when it was copied into the batch buffer. This patch changes the pointers to be gl_constant_value instead so that the assignment should end up copying without any alteration. This also makes it more obvious that the values being stored here are overloaded for multiple types. There are some static asserts where the values are uploaded to ensure that the size of gl_constant_value is the same as a float. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81150 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 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.