Vadim Girlin
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It's not a complete register pressure tracking, yet it helps to prevent register allocation problems in some cases where they were observed. The problems are uncovered by false dependencies between fetch instructions introduced by some recent changes in TGSI and/or default backend. Sometimes we have code like this: ... SAMPLE R5.xyzw, R5.xyzw ... store R5.xyzw somewhere MOV R5.x, <next x coord> MOV R5.y, <next y coord> SAMPLE R5.xyzw, R5.xyzw ... <may be repeated a lot of times> With 2D resources, z and w in SAMPLE src reg aren't used and can be simply masked, but shader backend doesn't have this information, so it's considered as data dependency by optimization algorithms.
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.