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* vo_opengl: add an angle-es2 backendwm42016-05-101-0/+2
| | | | | | It forces es2 mode on ANGLE. Only useful for testing. Since the normal "angle" backend already falls back to es2 if es3 does not work, this new backend always exit when autoprobing it.
* vo_opengl: GLX: try to create 3.3 core profile contextwm42016-03-191-0/+11
| | | | | | | | | | | | | | | | Until now, we have tried to create a GL 3.0 context. The main reason for this is that many Mesa-based drivers did not support anything better. But some drivers (Mesa AMD) will not report a higher OpenGL version, because their compatibility mode is restricted. While later GL features are reported as extensions just fine, there doesn't seem to be a way to determine or enable higher GLSL versions. Add some more shitty hacks to try to deal with this messed up situation, and try to probe each interesting GL version separately (starting with 3.3, then 3.2 etc.). Other backends might suffer from similar problems, but these will have to deal with it on their own. Probably fixes #2938, or maybe not.
* Change GPL/LGPL dual-licensed files to LGPLwm42016-01-191-13/+7
| | | | | | | | | | | Do this to make the license situation less confusing. This change should be of no consequence, since LGPL is compatible with GPL anyway, and making it LGPL-only does not restrict the use with GPL code. Additionally, the wording implies that this is allowed, and that we can just remove the GPL part.
* vo_opengl: fall back to gcc thread local storagewm42015-12-231-1/+7
| | | | | | | | | | | | gcc 4.8 does not support C11 thread local storage. This is a bit annoying, so add a hack to use the gcc specific __thread extension if C11 TLS is not available. (This is used for the extremely silly mpv-internal way hwdec modules access some platform specific handles. Disabling it simply made hwdec_vaegl.c always fail initialization.) Fixes #2631.
* vo_opengl: split backend code from common.c to context.cwm42015-12-191-0/+228
Now common.c only contains the code for the function loader, while context.c contains the backend loader/dispatcher. Not calling it "backend.c", because the central struct is called MPGLContext.