Roland Scheidegger
7a55c436c6
vsplit_get_base_idx explicitly returned idx 0 and set the ofbit
in case of overflow. We'd then check the ofbit and use idx 0 instead of
looking it up. This was necessary because DRAW_GET_IDX used to return
DRAW_MAX_FETCH_IDX and not 0 in case of overflows.
However, this is all unnecessary, we can just let DRAW_GET_IDX return 0
in case of overflow. In fact before bbd1e60198
the code already did that, not sure why this particular bit was changed
(might have been one half of an attempt to get these indices to actual draw
shader execution - in fact I think this would make things less awkward, it
would require moving the eltBias handling to the shader as well).
Note there's other callers of DRAW_GET_IDX - those code paths however
explicitly do not handle index buffer overflows, therefore the overflow
value doesn't matter for them.
Also do some trivial simplification - for (unsigned) a + b, checking res < a
is sufficient for overflow detection, we don't need to check for res < b too
(similar for signed).
And an index buffer overflow check looked bogus - eltMax is the number of
elements in the index buffer, not the maximum element which can be fetched.
(Drop the start check against the idx buffer though, this is already covered
by end check and end < start).
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
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.