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We do this in two steps: first we clip the dst rect and adjust the src rect accordingly. Then we do it the other way around. In both passes the adjustment part involves multiplying by a scale factor that can lead to a small precision loss. This is breaking a few dEQP tests. Specifically, the problem happens when we need to clip the same coordinate twice. For example, if srcX0 and dstX0 need both to be clipped we want to avoid the situation where we clip srcX0 first, then adjust dstX0 accordingly but then we realize that the resulting dstX0 still needs to be clipped, so we clip dstX0 and adjust srcX0 again. Each of these two passes can lead to precission loss. What we want to do here is detect the rect that leads to the largest clip (accounting for the scale factor involved), clip that rect and adjust the other one. With this we ensure that the adjusted coordinate does not need to be clipped again and we can skip a second pass, improving precision. Fixes the following 4 dEQP tests: dEQP-GLES3.functional.fbo.blit.rect.out_of_bounds_reverse_src_x_nearest dEQP-GLES3.functional.fbo.blit.rect.out_of_bounds_reverse_src_x_linear dEQP-GLES3.functional.fbo.blit.rect.out_of_bounds_reverse_dst_x_nearest dEQP-GLES3.functional.fbo.blit.rect.out_of_bounds_reverse_dst_x_linear Reviewed-by: Kenneth Graunke <kenneth@whitecape.org> Tested-by: Mark Janes <mark.a.janes@intel.com> |
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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 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.