[OPENGL32][MESA] Describe the current status (#2309)

Since 5f2bebf7, the Mesa library in dll/opengl/ has been downgraded from 8.0.4 to 2.6,
while the related documents were not updated to reflect the change.
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Masanori Ogino 2020-02-08 02:09:38 +09:00 committed by GitHub
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Here is a brief explanation on how to sync Mesa in trunk base.
Windows provides OpenGL 1.1 with platform-specific extensions (WGL) in its
software implementation of OpenGL. The purpose of Mesa in this directory is to
provide an equivalent of that. In order to accomplish just this purpose, it is
based on Mesa 2.6 and not intended to be synchronized with recent versions.
See CORE-7499 for details.
Current version is 8.0.4
- SOURCE FILES :
________________
All unnecessary files and directories where removed from the tree, as it's already a huge piece of code.
- build tools (bin, configs, scons, src/gallium/tools) were removed, as we don't use it.
- documentation (docs, src/gallium/docs, doxygen) were removed. If you want to contribute to libMesa, you'd better use their build system, not our adapted one
- tests and testing tools were removed (test, src/gallium/tests, src/gallium/tools)
- egl functionality (src/egl) is useless to us and were removed.
- gbm functionality (src/gbm) is useless to us and were removed.
- getopt implementation (src/getopt, for MSVC compatibility) is useless to us, we already have one
- glx (src/glx) functionality is useless to us and were removed.
- src/gallium
- All gallium drivers (src/gallium/driver) where deleted, except for the softpipe one.
- All gallium state trackers (src/gallium/state_trackers) were removed, except for the wgl one
- All gallium targets (src/gallium/targets) were removed, except for the libgl-gdi one.
- All gallium window system backends (src/gallium/winsys) were removed, except for the gdi one (sw/gdi)
- src/mapi
- only mapi and glapi directories were relevant and kept
- src/mesa
- All MESA drivers where deleted (src/mesa/drivers), except for the "common" part and osmesa (off-screen mesa) library.
- Architecture specifics were removed. x86 and x86_64 might be restored in future
- src/glu where kept and will be used for the glu32 dll implementation
- GENERATED FILES:
__________________
libMesa build system generates source files (using scons).
They were taken from an out-of-source build an put in the "generated" directory, using the same
directory structure for the sake of ease of maintainability.
- CMAKELISTS FILES:
___________________
Those files were written using the Sconscript and source list files as reference. I think that diff-ing them between two
versions would permit to easily update the cmake configuration files.
If you look for a modern software OpenGL implemenation, a Mesa package with
the Gallium LLVMpipe driver is available on RAPPS.

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@ -27,7 +27,7 @@ Used Version: 2.9.0
Website: http://www.freetype.org
Title: Mesa3D
Used Version: 8.0.4
Used Version: 2.6
Website: http://www.mesa3d.org
Title: Mesa3D glu libary