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GLES can be enabled by running scons with
$ scons gles=yes
When gles=yes is given, the build is changed in three ways. First,
libmesa.a will be built with FEATURE_ES1 and FEATURE_ES2. This makes
DRI drivers and libEGL support and advertise GLES support. Second, GLES
libraries will be created. They are libGLESv1_CM, libGLESv2, and
libglapi. Last, libGL or opengl32 will link to libglapi. This change
is required as _glapi_* will be declared as __declspec(dllimport) in
libmesa.a on windows. libmesa.a expects those symbols to be defined in
another DLL. Due to this change to GL, GLES support is marked
experimental.
Note that GLES requires libxml2-python to generate some of its sources.
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Fixes nasty bug where some parts of the code didn't define WIN32_THREADS
and were using the integer mutex implementation, causing even confusion
to the debuggers.
And there is little interest of other thread implemenation on Win32
besides Win32 threads.
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See http://www.opengl.org/registry/specs/ARB/wgl_pbuffer.txt
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Drivers scons files for a later time
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This is only compile tested with crossmingw.
V2:
- reference count stw_framebuffer
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Some of the demo progams legitimately need the functionality
that's disabled by WIN32_LEAN_AND_MEAN.
Instead the solution should be to define WIN32_LEAN_AND_MEAN just before
including windows.h on a case by case basis.
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While the WGL API has been stale for decades now, the ICD interface has
been updated with new Windows versions, so it is much easier to define
everything in terms of the ICD interfaces, which is pretty much what
Microsoft's opengl32.dll does anyway.
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It is easier to have the WGL API on top of the ICD callbacks as
Microsoft's own implementation does, than to have a seperate shared
entity. This source reorganization is in antecipation of that.
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Required as some applications
retrieve and call these functions regardless of the fact that we
don't advertise the extension and further more the results of
wglGetProcAddress are NULL.
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These don't respect the stdcall, so they crash upon return.
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Keep these internal structs private to wgl/shared. Pull in
some pixelformat choosing code from wgl/wgl to avoid exporting them
more generally.
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Each of icd, shared and wgl now have the opportunity to maintain their
own per-device structs, which should reduce the need for these
modules to be looking into each others structures.
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Similar to the GLX state trackers for DRI and xlib.
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