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Currently, vector types are linked together closely: the glsl_type objects for float, vec2, vec3, and vec4 are all elements of the same array, in that exact order. This makes it possible to obtain vector types via pointer arithmetic on the scalar type's convenience pointer. For example, float_type + (3 - 1) = vec3. However, relying on this is extremely fragile. There's no particular reason the underlying type objects need to be stored in an array. They could be individual class members, possibly with padding between them. Then the pointer arithmetic would break, and we'd get bad pointers to non-heap allocated data, causing subtle breakage that can't be detected by valgrind. Cue insanity. Or someone could simply reorder the type variables, causing us to get the wrong type entirely. Also cue insanity. Writing this explicitly is much safer. With the new helper functions, it's a bit less code even. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Eric Anholt <eric@anholt.net> |
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File: docs/README.WIN32 Last updated: 23 April 2011 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. 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.