cocoa-cb: initial implementation via opengl-cb API

this is meant to replace the old and not properly working vo_gpu/opengl
cocoa backend in the future. the problems are various shortcomings of
Apple's opengl implementation and buggy behaviour in certain
circumstances that couldn't be properly worked around. there are also
certain regressions on newer macOS versions from 10.11 onwards.

- awful opengl performance with a none layer backed context
- huge amount of dropped frames with an early context flush
- flickering of system elements like the dock or volume indicator
- double buffering not properly working with a none layer backed context
- bad performance in fullscreen because of system optimisations

all the problems were caused by using a normal opengl context, that
seems somewhat abandoned by apple, and are fixed by using a layer backed
opengl context instead. problems that couldn't be fixed could be
properly worked around.

this has all features our old backend has sans the wid embedding,
the possibility to disable the automatic GPU switching and taking
screenshots of the window content. the first was deemed unnecessary by
me for now, since i just use the libmpv API that others can use anyway.
second is technically not possible atm because we have to pre-allocate
our opengl context at a time the config isn't read yet, so we can't get
the needed property. third one is a bit tricky because of deadlocking
and it needed to be in sync, hopefully i can work around that in the
future.

this also has at least one additional feature or eye-candy. a properly
working fullscreen animation with the native fs. also since this is a
direct port of the old backend of the parts that could be used, though
with adaptions and improvements, this looks a lot cleaner and easier to
understand.

some credit goes to @pigoz for the initial swift build support which
i could improve upon.

Fixes: #5478, #5393, #5152, #5151, #4615, #4476, #3978, #3746, #3739,
#2392, #2217

1 files changed, 21 insertions, 3 deletions

diff --git a/player/client.c b/player/client.c
index 618dbc4165..1df7e659d8 100644
--- a/player/client.c
+++ b/player/client.c
@@ -1726,6 +1726,17 @@ int mpv_opengl_cb_uninit_gl(mpv_opengl_cb_context *ctx)
 {
     return MPV_ERROR_NOT_IMPLEMENTED;
 }
+void mp_client_set_control_callback(struct mpv_opengl_cb_context *ctx,
+                                           mpv_opengl_cb_control_fn callback,
+                                           void *callback_ctx)
+{
+}
+void mp_client_set_icc_profile(struct mpv_opengl_cb_context *ctx, bstr icc_data)
+{
+}
+void mp_client_set_ambient_lux(struct mpv_opengl_cb_context *ctx, int lux)
+{
+}
 #endif
 
 int mpv_opengl_cb_render(mpv_opengl_cb_context *ctx, int fbo, int vp[4])
@@ -1733,22 +1744,29 @@ int mpv_opengl_cb_render(mpv_opengl_cb_context *ctx, int fbo, int vp[4])
     return mpv_opengl_cb_draw(ctx, fbo, vp[2], vp[3]);
 }
 
-void *mpv_get_sub_api(mpv_handle *ctx, mpv_sub_api sub_api)
+void *mp_get_sub_api2(mpv_handle *ctx, mpv_sub_api sub_api, bool lock)
 {
     if (!ctx->mpctx->initialized)
         return NULL;
     void *res = NULL;
-    lock_core(ctx);
+    if (lock)
+        lock_core(ctx);
     switch (sub_api) {
     case MPV_SUB_API_OPENGL_CB:
         res = opengl_cb_get_context(ctx);
         break;
     default:;
     }
-    unlock_core(ctx);
+    if (lock)
+        unlock_core(ctx);
     return res;
 }
 
+void *mpv_get_sub_api(mpv_handle *ctx, mpv_sub_api sub_api)
+{
+    return mp_get_sub_api2(ctx, sub_api, true);
+}
+
 struct mp_custom_protocol {
     char *protocol;
     void *user_data;