CNC_Window.mm

#include <AppKit/AppKit.h>
#include <CoreVideo/CoreVideo.h>
#include "CNC_Types.h"

@interface MainWindowDelegate : NSObject< NSWindowDelegate >
{
    @public
        bool* m_running;
}

- (instancetype)initWithBool:(bool*)running;

@end

@implementation MainWindowDelegate

- (instancetype)initWithBool:(bool*)running
{
    self = [super init];

    m_running = running;

    return self;
}

- (BOOL)windowShouldClose:(NSWindow*)sender
{
    *m_running = false;
    return true;
}
@end

@interface MainWindow : NSWindow
{
    @public
        NSCondition*     m_displayLinkSignal;
        CVDisplayLinkRef m_displayLink;
}
@end

@implementation MainWindow

- (BOOL)canBecomeKeyWindow  { return true; }
- (BOOL)canBecomeMainWindow { return true; }

@end

CVReturn DisplayLinkCallback( CVDisplayLinkRef   displayLink, 
                              const CVTimeStamp* inNow, 
                              const CVTimeStamp* inOutputTime, 
                              CVOptionFlags      flagsIn, 
                              CVOptionFlags*     flagsOut, 
                              void*              context )
{
    MainWindow* window = (MainWindow*)context;

    [window->m_displayLinkSignal signal];

    return kCVReturnSuccess;
}

MainWindow* CreateMainWindow( bool* running )
{
    MainWindowDelegate* delegate = [[MainWindowDelegate alloc] initWithBool:running];
    
    NSRect contentRect = NSMakeRect( 0, 0, WINDOW_WIDTH, WINDOW_HEIGHT );
    MainWindow* window = [[MainWindow alloc] initWithContentRect: contentRect 
                                                       styleMask: NSWindowStyleMaskClosable | 
                                                                  NSWindowStyleMaskTitled |
                                                                  NSWindowStyleMaskResizable
                                                         backing: NSBackingStoreBuffered defer: false];

    [window setTitle: @"synthesizer by cnc" ];
    [window setDelegate: delegate];
    [window makeKeyAndOrderFront: NULL];

    window->m_displayLinkSignal = [NSCondition new];
    CVDisplayLinkCreateWithActiveCGDisplays( &window->m_displayLink );
    CVDisplayLinkSetOutputCallback( window->m_displayLink, DisplayLinkCallback, (void*)window );
    CVDisplayLinkStart( window->m_displayLink );
    
    return window;
}