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The polygon offset math used for triangles by the WM is "OffsetUnits * 2 * MRD + OffsetFactor * m" where 'MRD' is the minimum resolvable difference for the depth buffer (~1/(1<<16) or ~1/(1<<24)), 'm' is the approximated slope from the GL spec, and '2' is this magic number from the original i965 code dump that we deviate from the GL spec by because "it makes glean work" (except that it doesn't, because of some hilarity with 0.5 * approximately 2.0 != 1.0. go glean!). This clipper code for unfilled polygons, on the other hand, was doing "OffsetUnits * garbage + OffsetFactor * m", where garbage was MRD in the case of 16-bit depth visual (regardless the FBO's depth resolution), or 128 * MRD for 24-bit depth visual. This change just makes the unfilled polygons behavior match the WM's filled polygons behavior. Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> |
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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.