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A little analysis shows that the worst-case value for "nr" is 17: - base_mrf = 2 ... 2 - header present (say gen == 5) ... 4 - aa_dest_stencil_reg (stencil test) ... 5 - SIMD16 mode: += 4 * reg_width ... 13 - source_depth_to_render_target ... 15 - dest_depth_reg ... 17 This resulted in us setting base_mrf to 2 and mlen to 15. In other words, we'd try to use m2..m16. But m16 doesn't exist pre-Gen6. Also, the instruction scheduler data structures use arrays of size 16, so this would cause us to access them out of bounds. While the debugger system routine may need m0 and m1, we don't use it today, so the simplest solution is just to move base_mrf back to 1. That way, our worst case message fits in m1..m15, which is legal. An alternative would be to fail on SIMD16 in this case, but that seems a bit unfortunate if there's no real need to reserve m0 and m1. Fixes new piglit test shaders/depth-test-and-write on Ironlake. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=48218 Signed-off-by: Kenneth Graunke <kenneth@whitecape.org> 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.