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0faf26e6a0
When using seamless cube map mode and NEAREST filtering, we explicitly
overrode the wrap modes to CLAMP_TO_EDGE. This was to implement the
following spec text:
"If NEAREST filtering is done within a miplevel, always apply apply
wrap mode CLAMP_TO_EDGE."
However, textureGather() ignores the sampler's filtering mode, and
instead returns the four pixels that would be blended by LINEAR
filtering. This implies that we should do proper seamless filtering,
and include pixels from adjacent cube faces.
It turns out that we can simply delete the NEAREST -> CLAMP_TO_EDGE
overrides. Normal cube map sampling works by first selecting the
face, and then nearest filtering fetches the closest texel. If the
nearest texel was on a different face, then that face would have been
chosen. So it should always be within the face anyway, which
effectively performs CLAMP_TO_EDGE.
Fixes 86 dEQP-GLES31.texture.gather.basic.cube.* tests.
Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Suggested-by: Ian Romanick <idr@freedesktop.org>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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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.