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50cbcf0c46
Turns out the previous "fix" for handling per-pixel face selection and derivatives didn't work out that well - the derivatives were wrong by quite a bit, in theory transformation of the derivatives into cube space should work, but would be _a lot_ more work than the "simplified" transform used. So, for explicit derivatives, I'm just giving up and go back to not honoring them. For implicit derivatives (and the fake explicit ones) however we try something a little different, we just calculate rho as we would for a 3d texture, that is after scaling the coords by the inverse major axis. This gives the same results as calculating the derivs after projection of the coords to the same face as long as all pixels hit the same face (and only without rho_no_opt, otherwise it should be a bit worse). And when not all pixels are hitting the same face, the results aren't so hot but not catastrophically bad (I believe not off by more than a factor of 2 without no_rho_approx and not more than sqrt(2) with no_rho_approx). I think this is better than just picking the wrong face but who knows... Reviewed-by: Brian Paul <brianp@vmware.com> Reviewed-by: Jose Fonseca <jfonseca@vmware.com> |
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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.