Roland Scheidegger
d366520e85
lp_build_rsqrt initially did not do any newton-raphson step. This meant that precision was only ~11 bits, but this handled both input 0.0 and +infinity correctly. It did not however handle input 1.0 accurately, and denormals always generated infinity result. Doing a newton-raphson step increased precision significantly (but notably input 1.0 still doesn't give output 1.0), however this fails for inputs 0.0 and infinity (both result in NaNs). Try to fix this up by using cmp/select but since this is all quite fishy (and still doesn't handle denormals) disable for now. Note that even with workarounds it should still have been faster since the fallback uses sqrt/div (which both use the usually unpipelined and slow divider hw). Also add some more test values to lp_test_arit and test lp_build_rcp() too while there. v2: based on José's feedback, avoid hacky infinity definition which doesn't work with msvc (unfortunately using INFINITY won't cut it neither on non-c99 compilers) in lp_build_rsqrt, and while here fix up the input infinity case too (it's disabled anyway). Only test infinity input case if we have c99, and use float cast for calculating reference rsqrt value so we really get what we expect. Reviewed-by: José Fonseca <jfonseca@vmware.com>
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.