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2a6d432040
Previously, we conditionally set up the SF pipline stage with a urb_entry_read_offset of 2 when clipping was in use, and 1 otherwise, causing the clip distance VUE slots to be skipped if present. This was an extremely minor savings (it saved the SF unit from reading 2 vec4s out of the URB, but it didn't affect any computation, since we only instruct the SF unit to perform interpolation on VUE slots that are actually used by the fragment shader). GLSL 1.30 requires an interpolated version of gl_ClipDistance to be available for reading in the fragment shader, so we need the SF's urb_entry_read_offset to be 1 when the fragment shader reads from gl_ClipDistance. This patch just unconditionally sets the urb_entry_read_offset to 1 in all cases; this is sufficient to make gl_ClipDistance available to the fragment shader when it is needed, and the performance loss should be negligible when it isn't. Reviewed-by: Eric Anholt <eric@anholt.net> |
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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.