panopainter/PanoPainter-OSX/main.cpp

#include "pch.h"
#include "log.h"
#include "shader.h"
#include "shape.h"
#include "texture.h"
#include "image.h"
#include "app.h"
#include "keymap.h"
#include <CoreFoundation/CoreFoundation.h>
#include <Cocoa/Cocoa.h>
#include <CoreVideo/CoreVideo.h>
#include <OpenGL/OpenGL.h>

@interface View : NSOpenGLView
{
    CVDisplayLinkRef dl;
    NSOpenGLContext* glctx;
    _CGLContextObject* cgl;
    bool gl_ready;
}
- (void)terminateGL;
@end @implementation View
- (instancetype)initWithFrame:(NSRect)frameRect
{
    gl_ready = false;
    NSOpenGLPixelFormatAttribute attrs[] =
    {
        NSOpenGLPFADoubleBuffer,
        NSOpenGLPFADepthSize, 24,
        // Must specify the 3.2 Core Profile to use OpenGL 3.2
        NSOpenGLPFAOpenGLProfile, NSOpenGLProfileVersion3_2Core,
        // Multisample
        NSOpenGLPFAMultisample,
        NSOpenGLPFASamples, 2,
        NSOpenGLPFASampleBuffers, 1,
        0
    };
    NSOpenGLPixelFormat *pf = [[NSOpenGLPixelFormat alloc] initWithAttributes:attrs];
    NSOpenGLContext* context = [[NSOpenGLContext alloc] initWithFormat:pf shareContext:nil];
    self = [super initWithFrame:frameRect pixelFormat:pf];
    [self setPixelFormat:pf];
    [self setOpenGLContext:context];
    return self;
}
- (void)prepareOpenGL
{
    NSLog(@"prepare");
    
    // Synchronize buffer swaps with vertical refresh rate
    GLint swapInt = 1;
    [[self openGLContext] setValues:&swapInt forParameter:NSOpenGLCPSwapInterval];
    
    // Create a display link capable of being used with all active displays
    CVDisplayLinkCreateWithActiveCGDisplays(&dl);
    
    // Set the renderer output callback function
    CVDisplayLinkSetOutputCallback(dl, &MyDisplayLinkCallback, (__bridge void*)self);
    
    // Set the display link for the current renderer
    CGLContextObj cglContext = [[self openGLContext] CGLContextObj];
    CGLPixelFormatObj cglPixelFormat = [[self pixelFormat] CGLPixelFormatObj];
    CVDisplayLinkSetCurrentCGDisplayFromOpenGLContext(dl, cglContext, cglPixelFormat);
    
    CGLEnable([self.openGLContext CGLContextObj], kCGLCECrashOnRemovedFunctions);

    // Activate the display link
    CVDisplayLinkStart(dl);

    cgl = [[self openGLContext] CGLContextObj];
    glctx = [self openGLContext];
    
    CGLLockContext([[self openGLContext] CGLContextObj]);
    App::I.init();
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
    gl_ready = true;
}

- (void)terminateGL
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    CVDisplayLinkRelease(dl);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}

// This is the renderer output callback function
static CVReturn MyDisplayLinkCallback(CVDisplayLinkRef displayLink, const CVTimeStamp* now,
                                      const CVTimeStamp* outputTime, CVOptionFlags flagsIn, CVOptionFlags* flagsOut, void* displayLinkContext)
{
    CVReturn result = [(__bridge View*)displayLinkContext getFrameForTime:outputTime];
    return result;
}

- (CVReturn)getFrameForTime:(const CVTimeStamp*)outputTime
{
    static double _timeFreq = CVGetHostClockFrequency();
    static double _prevTime = (double)outputTime->hostTime / _timeFreq;
    double hostTime = (double)outputTime->hostTime;
    double now = hostTime / _timeFreq;
    
    // this will not update unless 1/30th of a second has passed since the last update
    if ( now < _prevTime + (1.0 / 30.0) && App::I.redraw )
    {
        // We draw on a secondary thread through the display link
        // When resizing the view, -reshape is called automatically on the main
        // thread. Add a mutex around to avoid the threads accessing the context
        // simultaneously when resizing
        [glctx makeCurrentContext];
        CGLLockContext([glctx CGLContextObj]);
        
        App::I.clear();
        App::I.update(now - _prevTime);
        
        //[[self openGLContext] flushBuffer];
        // returning NO will cause the layer to NOT be redrawn
        
        CGLFlushDrawable([glctx CGLContextObj]);
        CGLUnlockContext([glctx CGLContextObj]);
        return NO;
    }
    else
    {
        // change whatever you want to change here, as a function of time elapsed
        _prevTime = now;
        // return YES to have your layer redrawn
        return YES;
    }
    
    return kCVReturnSuccess;
}

- (void)dealloc
{
    // Release the display link
    CVDisplayLinkRelease(dl);
}

- (void)drawRect:(NSRect)dirtyRect
{
    NSLog(@"drawRect");
    
    // We draw on a secondary thread through the display link
    // When resizing the view, -reshape is called automatically on the main
    // thread. Add a mutex around to avoid the threads accessing the context
    // simultaneously when resizing
    [glctx makeCurrentContext];
    CGLLockContext(cgl);

    App::I.update(0);
    
    //[[self openGLContext] flushBuffer];
    // returning NO will cause the layer to NOT be redrawn
    
    CGLFlushDrawable(cgl);
    CGLUnlockContext(cgl);
}

- (void)reshape
{
    [super reshape];
    
    // We draw on a secondary thread through the display link. However, when
    // resizing the view, -drawRect is called on the main thread.
    // Add a mutex around to avoid the threads accessing the context
    // simultaneously when resizing.
    CGLLockContext([[self openGLContext] CGLContextObj]);
    
    // Get the view size in Points
    NSRect viewRectPoints = [self bounds];
    
#if SUPPORT_RETINA_RESOLUTION
    
    // Rendering at retina resolutions will reduce aliasing, but at the potential
    // cost of framerate and battery life due to the GPU needing to render more
    // pixels.
    
    // Any calculations the renderer does which use pixel dimentions, must be
    // in "retina" space.  [NSView convertRectToBacking] converts point sizes
    // to pixel sizes.  Thus the renderer gets the size in pixels, not points,
    // so that it can set it's viewport and perform and other pixel based
    // calculations appropriately.
    // viewRectPixels will be larger than viewRectPoints for retina displays.
    // viewRectPixels will be the same as viewRectPoints for non-retina displays
    NSRect viewRectPixels = [self convertRectToBacking:viewRectPoints];
    
#else //if !SUPPORT_RETINA_RESOLUTION
    
    // App will typically render faster and use less power rendering at
    // non-retina resolutions since the GPU needs to render less pixels.
    // There is the cost of more aliasing, but it will be no-worse than
    // on a Mac without a retina display.
    
    // Points:Pixels is always 1:1 when not supporting retina resolutions
    NSRect viewRectPixels = viewRectPoints;
    
#endif // !SUPPORT_RETINA_RESOLUTION
    App::I.resize(viewRectPixels.size.width, viewRectPixels.size.height);
    
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)renewGState
{
    // Called whenever graphics state updated (such as window resize)
    
    // OpenGL rendering is not synchronous with other rendering on the OSX.
    // Therefore, call disableScreenUpdatesUntilFlush so the window server
    // doesn't render non-OpenGL content in the window asynchronously from
    // OpenGL content, which could cause flickering.  (non-OpenGL content
    // includes the title bar and drawing done by the app with other APIs)
    [[self window] disableScreenUpdatesUntilFlush];
    
    [super renewGState];
}
- (void)mouseDown:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_down(0, mouseLoc.x, App::I.height - mouseLoc.y - 1, theEvent.pressure, kEventSource::Mouse);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)rightMouseDown:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_down(1, mouseLoc.x, App::I.height - mouseLoc.y - 1, theEvent.pressure, kEventSource::Mouse);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)mouseUp:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_up(0, mouseLoc.x, App::I.height - mouseLoc.y - 1, kEventSource::Mouse);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)rightMouseUp:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_up(1, mouseLoc.x, App::I.height - mouseLoc.y - 1, kEventSource::Mouse);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)mouseMoved:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_move(mouseLoc.x, App::I.height - mouseLoc.y - 1, theEvent.pressure, kEventSource::Mouse);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
-(void)mouseDragged:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_move(mouseLoc.x, App::I.height - mouseLoc.y - 1, theEvent.pressure, kEventSource::Mouse);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)rightMouseDragged:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_move(mouseLoc.x, App::I.height - mouseLoc.y - 1, theEvent.pressure, kEventSource::Mouse);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)scrollWheel:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto mouseLoc = [self convertPoint:[theEvent locationInWindow] fromView:nil];
    App::I.mouse_scroll(mouseLoc.x, App::I.height - mouseLoc.y - 1, [theEvent deltaY]);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)keyDown:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto keyCode = [theEvent keyCode];
    auto chars = [theEvent characters];
    App::I.key_down(convert_key(keyCode));
    if (const char* cstr = [chars cStringUsingEncoding:NSASCIIStringEncoding])
        App::I.key_char(cstr[0]);
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
- (void)keyUp:(NSEvent *)theEvent
{
    CGLLockContext([[self openGLContext] CGLContextObj]);
    auto keyCode = [theEvent keyCode];
    auto chars = [theEvent characters];
    App::I.key_up(convert_key(keyCode));
    CGLUnlockContext([[self openGLContext] CGLContextObj]);
}
@end

@interface Window : NSWindow
@end @implementation Window
@end

@interface Controller : NSWindowController<NSWindowDelegate>
@end @implementation Controller
- (void)windowWillClose:(NSNotification *)notification
{
    [[NSApplication sharedApplication] terminate:nil];
}
@end

@interface AppOSX : NSApplication<NSApplicationDelegate>
{
    Window* window;
    Controller* controller;
    View* view;
}
@end @implementation AppOSX
- (instancetype)init
{
    self = [super init];
    [self setActivationPolicy:NSApplicationActivationPolicyRegular]; // make it to the front
    [self setDelegate:self];
    return self;
}
- (void)applicationWillTerminate:(NSNotification *)notification
{
    [view terminateGL];
    [window close];
}
- (void)applicationDidFinishLaunching:(NSNotification *)notification
{
    App::I.initLog();
    App::I.create();
    NSRect r = NSMakeRect(0, 0, App::I.width, App::I.height);
    
    view = [[View alloc] initWithFrame:r];
    controller = [[Controller alloc] initWithWindow:window];

    auto style = NSTitledWindowMask|NSMiniaturizableWindowMask|NSResizableWindowMask|NSClosableWindowMask;
    window = [[Window alloc] initWithContentRect:r styleMask:style backing:NSBackingStoreBuffered defer:NO];
    [window setDelegate:controller];
    [window setTitle:@"PanoPainter 0.1.2 alpha"];
    [window center];
    [window makeKeyAndOrderFront:controller];
    [window setContentView:view];
    [window setAcceptsMouseMovedEvents:true];
    [window makeFirstResponder:view];
    
    auto menubar = [NSMenu new];
    auto appMenuItem = [NSMenuItem new];
    [menubar addItem:appMenuItem];
    [self setMainMenu:menubar];
    
    auto appMenu = [NSMenu new];
    auto appName = [[NSProcessInfo processInfo] processName];
    auto quitTitle = [@"Quit " stringByAppendingString:appName];
    auto quitMenuItem = [[NSMenuItem alloc] initWithTitle:quitTitle
                                                   action:@selector(terminate:) keyEquivalent:@"q"];
    [appMenu addItem:quitMenuItem];
    [appMenuItem setSubmenu:appMenu];
    
    NSLog(@"app launched");
}
@end

int main(int argc, const char * argv[])
{
    AppOSX* app = [AppOSX sharedApplication];
    [app run];
    return 0;
}