build: move main-fn files to osdep

And split the Cocoa and Unix cases. Simplify the Cocoa case slightly by
calling mpv_main directly, instead of passing a function pointer. Also
add a comment explaining why Cocoa needs a special case at all.

old-makefile

@@ -335,7 +335,7 @@ all: $(ALL_TARGETS)
 %.o: %.c
 	$(CC) $(DEPFLAGS) $(CFLAGS) -c -o $@ $<
 
-mpv: $(OBJECTS) player/main-fn-unix.o
+mpv: $(OBJECTS) osdep/main-fn-unix.o
 	$(CC) -o $@ $^ $(EXTRALIBS)
 
 input/input.c: input/input_conf.h

osdep/macosx_application.h

@@ -18,8 +18,6 @@
 #ifndef MPV_MACOSX_APPLICATION
 #define MPV_MACOSX_APPLICATION
 
-typedef int (*mpv_main_fn)(int, char**);
-
 // Menu Keys identifing menu items
 typedef enum {
     MPM_H_SIZE,
@@ -30,7 +28,7 @@ typedef enum {
 } MPMenuKey;
 
 // multithreaded wrapper for mpv_main
-int cocoa_main(mpv_main_fn mpv_main, int argc, char *argv[]);
+int cocoa_main(int argc, char *argv[]);
 void cocoa_register_menu_item_action(MPMenuKey key, void* action);
 
 #endif /* MPV_MACOSX_APPLICATION */

osdep/macosx_application.m

@@ -26,6 +26,7 @@
 #include "osdep/macosx_compat.h"
 #import "osdep/macosx_events_objc.h"
 #include "osdep/threads.h"
+#include "osdep/main-fn.h"
 
 #define MPV_PROTOCOL @"mpv://"
 
@@ -252,7 +253,6 @@ static void terminate_cocoa_application(void)
 @end
 
 struct playback_thread_ctx {
-    mpv_main_fn mpv_main;
     int  *argc;
     char ***argv;
 };
@@ -269,7 +269,7 @@ static void *playback_thread(void *ctx_obj)
     mpthread_set_name("playback core (OSX)");
     @autoreleasepool {
         struct playback_thread_ctx *ctx = (struct playback_thread_ctx*) ctx_obj;
-        int r = ctx->mpv_main(*ctx->argc, *ctx->argv);
+        int r = mpv_main(*ctx->argc, *ctx->argv);
         terminate_cocoa_application();
         // normally never reached - unless the cocoa mainloop hasn't started yet
         exit(r);
@@ -361,13 +361,12 @@ static bool bundle_started_from_finder(int argc, char **argv)
     }
 }
 
-int cocoa_main(mpv_main_fn mpv_main, int argc, char *argv[])
+int cocoa_main(int argc, char *argv[])
 {
     @autoreleasepool {
         application_instantiated = true;
 
         struct playback_thread_ctx ctx = {0};
-        ctx.mpv_main = mpv_main;
         ctx.argc     = &argc;
         ctx.argv     = &argv;
 

osdep/main-fn-cocoa.c

@@ -0,0 +1,10 @@
+#include "osdep/macosx_application.h"
+
+// This is needed because Cocoa absolutely requires creating the NSApplication
+// singleton and running it in the "main" thread. It is apparently not
+// possible to do this on a separate thread at all. It is not known how
+// Apple managed this colossal fuckup.
+int main(int argc, char *argv[])
+{
+    return cocoa_main(argc, argv);
+}

osdep/main-fn-unix.c

@@ -0,0 +1,6 @@
+#include "main-fn.h"
+
+int main(int argc, char *argv[])
+{
+    return mpv_main(argc, argv);
+}

osdep/main-fn-win.c

@@ -2,10 +2,10 @@
 
 #include "config.h"
 
+#include "common/common.h"
 #include "osdep/io.h"
 #include "osdep/terminal.h"
-
-#include "core.h"
+#include "osdep/main-fn.h"
 
 int wmain(int argc, wchar_t *argv[]);
 

osdep/main-fn.h

@@ -0,0 +1 @@
+int mpv_main(int argc, char *argv[]);

player/core.h

@@ -404,7 +404,6 @@ struct track *select_track(struct MPContext *mpctx, enum stream_type type,
                            int tid, int ffid, char **langs);
 
 // main.c
-int mpv_main(int argc, char *argv[]);
 int mp_initialize(struct MPContext *mpctx, char **argv);
 struct MPContext *mp_create(void);
 void mp_destroy(struct MPContext *mpctx);

player/main-fn-unix.c

@@ -1,15 +0,0 @@
-#include "config.h"
-#include "core.h"
-
-#if HAVE_COCOA
-#include "osdep/macosx_application.h"
-#endif
-
-int main(int argc, char *argv[])
-{
-#if HAVE_COCOA
-    return cocoa_main(mpv_main, argc, argv);
-#else
-    return mpv_main(argc, argv);
-#endif
-}

player/main.c

@@ -30,6 +30,7 @@
 #include "osdep/io.h"
 #include "osdep/terminal.h"
 #include "osdep/timer.h"
+#include "osdep/main-fn.h"
 
 #include "common/av_log.h"
 #include "common/codecs.h"

wscript_build.py

@@ -71,9 +71,12 @@ def build(ctx):
         source = "demux/ebml.c",
         target = "ebml_defs.c")
 
-    main_fn_c = {
-        'win32':  'player/main-fn-win.c',
-    }.get(ctx.env.DEST_OS, "player/main-fn-unix.c")
+    if ctx.env.DEST_OS == 'win32':
+        main_fn_c = 'osdep/main-fn-win.c'
+    elif ctx.dependency_satisfied('cocoa'):
+        main_fn_c = 'osdep/main-fn-cocoa.c'
+    else:
+        main_fn_c = 'osdep/main-fn-unix.c'
 
     getch2_c = {
         'win32':  'osdep/terminal-win.c',