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Previously, our VUE map code always assigned slots to varyings sequentially, in one contiguous block. This was a bad fit for separate shaders - the GS input layout depended or the VS output layout, so if we swapped out vertex shaders, we might have to recompile the GS on the fly - which rather defeats the point of using separate shader objects. (Tessellation would suffer from this as well - we could have to recompile the HS, DS, and GS.) Instead, this patch makes the VUE map for separate shaders use a fixed layout, based on the input/output variable's location field. (This is either specified by layout(location = ...) or assigned by the linker.) Corresponding inputs/outputs will match up by location; if there's a mismatch, we're allowed to have undefined behavior. This may be less efficient - depending what locations were chosen, we may have empty padding slots in the VUE. But applications presumably use small consecutive integers for locations, so it hopefully won't be much worse in practice. 3% of Dota 2 Reborn shaders are hurt, but only by 2 instructions. This seems like a small price to pay for avoiding recompiles. Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> Reviewed-by: Chris Forbes <chrisf@ijw.co.nz> |
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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.