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e57b98bad3
We were fixing up the blend factor to ZERO, however this only works correctly with fixed point render buffers where the input values are clamped to 0/1 (because src_alpha_saturate is min(As, 1-Ad) so can be negative with unclamped inputs). Haven't seen any failure anywhere due to that with fixed point SNORM buffers (which clamp inputs to -1/1) but it should apply there as well (snorm blending is rare, even opengl 4.3 doesn't require snorm rendertargets at all, d3d10 requires them but they are not blendable). Doesn't look like piglit hits this though (some internal testing hits the float case at least). (With legacy OpenGL we could theoretically still use the fixup to zero if the fragment color clamp is enabled, but we can't detect that easily since we don't support native clamping hence it gets baked into the shader.) Reviewed-by: Jose Fonseca <jfonseca@vmware.com> Reviewed-by: Zack Rusin <zackr@vmware.com> |
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| SConstruct | ||
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 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. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. 1) install python 2.7 2) install scons (latest) 3) install mingw, flex, and bison 4) install libxml2 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get libxml2-python-2.9.1.win-amd64-py2.7.exe 5) install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe 6) install git 7) download mesa from git see http://www.mesa3d.org/repository.html 8) 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.