/*

     File: MainControler.m

 Abstract:  A controller object that handles full-screen/window modes 

 switching and user interactions.

  Version: 1.1

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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*/

#import "MainController.h"

#import "MyOpenGLView.h"

#import "Scene.h"

@implementation MainController

- (IBAction) goFullScreen:(id)sender

{

    isInFullScreenMode = YES;

    // Pause the non-fullscreen view

    [openGLView stopAnimation];

    // Mac OS X 10.6 and later offer a simplified mechanism to create full-screen contexts

#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5

    NSRect mainDisplayRect, viewRect;

    // Create a screen-sized window on the display you want to take over

    // Note, mainDisplayRect has a non-zero origin if the key window is on a secondary display

    mainDisplayRect = [[NSScreen mainScreen] frame];

    fullScreenWindow = [[NSWindow alloc] initWithContentRect:mainDisplayRect styleMask:NSBorderlessWindowMask 

                                                     backing:NSBackingStoreBuffered defer:YES];

    // Set the window level to be above the menu bar

    [fullScreenWindow setLevel:NSMainMenuWindowLevel+1];

    // Perform any other window configuration you desire

    [fullScreenWindow setOpaque:YES];

    [fullScreenWindow setHidesOnDeactivate:YES];

    // Create a view with a double-buffered OpenGL context and attach it to the window

    // By specifying the non-fullscreen context as the shareContext, we automatically inherit the OpenGL objects (textures, etc) it has defined

    viewRect = NSMakeRect(0.0, 0.0, mainDisplayRect.size.width, mainDisplayRect.size.height);

    fullScreenView = [[MyOpenGLView alloc] initWithFrame:viewRect shareContext:[openGLView openGLContext]];

    [fullScreenWindow setContentView:fullScreenView];

    // Show the window

    [fullScreenWindow makeKeyAndOrderFront:self];

    // Set the scene with the full-screen viewport and viewing transformation

    [scene setViewportRect:viewRect];

    // Assign the view's MainController to self

    [fullScreenView setMainController:self];

    if (!isAnimating) {

        // Mark the view as needing drawing to initalize its contents

        [fullScreenView setNeedsDisplay:YES];

    }

    else {

        // Start playing the animation

        [fullScreenView startAnimation];

    }

#else

    // Mac OS X 10.5 and eariler require additional work to capture the display and set up a special context

    // This demo uses CGL for full-screen rendering on pre-10.6 systems. You may also use NSOpenGL to achieve this.

    CGLPixelFormatObj pixelFormatObj;

    GLint numPixelFormats;

    // Capture the main display

    CGDisplayCapture(kCGDirectMainDisplay);

    // Set up an array of attributes

    CGLPixelFormatAttribute attribs[] = {

        // The full-screen attribute

        kCGLPFAFullScreen,

        // The display mask associated with the captured display

        // We may be on a multi-display system (and each screen may be driven by a different renderer), so we need to specify which screen we want to take over. For this demo, we'll specify the main screen.

        kCGLPFADisplayMask, CGDisplayIDToOpenGLDisplayMask(kCGDirectMainDisplay),

        // Attributes common to full-screen and non-fullscreen

        kCGLPFAAccelerated,

        kCGLPFANoRecovery,

        kCGLPFADoubleBuffer,

        kCGLPFAColorSize, 24,

        kCGLPFADepthSize, 16,

        0

    };

    // Create the full-screen context with the attributes listed above

    // By specifying the non-fullscreen context as the shareContext, we automatically inherit the OpenGL objects (textures, etc) it has defined

    CGLChoosePixelFormat(attribs, &pixelFormatObj, &numPixelFormats);

    CGLCreateContext(pixelFormatObj, [[openGLView openGLContext] CGLContextObj], &fullScreenContextObj);

    CGLDestroyPixelFormat(pixelFormatObj);

    if (!fullScreenContextObj) {

        NSLog(@"Failed to create full-screen context");

        CGReleaseAllDisplays();

        [self goWindow];

        return;

    }

    // Set the current context to the one to use for full-screen drawing

    CGLSetCurrentContext(fullScreenContextObj);

    // Attach a full-screen drawable object to the current context

    CGLSetFullScreen(fullScreenContextObj);

    // Lock us to the display's refresh rate

    GLint newSwapInterval = 1;

    CGLSetParameter(fullScreenContextObj, kCGLCPSwapInterval, &newSwapInterval);

    // Tell the scene the dimensions of the area it's going to render to, so it can set up an appropriate viewport and viewing transformation

    [scene setViewportRect:NSMakeRect(0, 0, CGDisplayPixelsWide(kCGDirectMainDisplay), CGDisplayPixelsHigh(kCGDirectMainDisplay))];

    // Perform the application's main loop until exiting full-screen

    // The shift here is from a model in which we passively receive events handed to us by the AppKit (in window mode)

    // to one in which we are actively driving event processing (in full-screen mode)

    while (isInFullScreenMode)

    {

        NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

        // Check for and process input events

        NSEvent *event;

        while (event = [NSApp nextEventMatchingMask:NSAnyEventMask untilDate:[NSDate distantPast] inMode:NSDefaultRunLoopMode dequeue:YES])

        {

            switch ([event type])

            {

                case NSLeftMouseDown:

                    [self mouseDown:event];

                    break;

                case NSLeftMouseUp:

                    [self mouseUp:event];

                    break;

                case NSLeftMouseDragged:

                    [self mouseDragged:event];

                    break;

                case NSKeyDown:

                    [self keyDown:event];

                    break;

                default:

                    break;

            }

        }

        // Update our animation

        CFAbsoluteTime currentTime = CFAbsoluteTimeGetCurrent();

        if (isAnimating) {

            [scene advanceTimeBy:(currentTime - renderTime)];

        }

        renderTime = currentTime;

        // Delegate to the scene object for rendering

        [scene render];

        CGLFlushDrawable(fullScreenContextObj);

        [pool release];

    }

#endif

}

- (void) goWindow

{

    isInFullScreenMode = NO;

#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5

    // Release the screen-sized window and view

    [fullScreenWindow release];

    [fullScreenView release];

#else

    // Set the current context to NULL

    CGLSetCurrentContext(NULL);

    // Clear the drawable object

    CGLClearDrawable(fullScreenContextObj);

    // Destroy the rendering context

    CGLDestroyContext(fullScreenContextObj);

    // Release the displays

    CGReleaseAllDisplays();

#endif

    // Switch to the non-fullscreen context

    [[openGLView openGLContext] makeCurrentContext];

    if (!isAnimating) {

        // Mark the view as needing drawing

        // The animation has advanced while we were in full-screen mode, so its current contents are stale

        [openGLView setNeedsDisplay:YES];

    }

    else {

        // Continue playing the animation

        [openGLView startAnimation];

    }

}

- (void) awakeFromNib

{

    // Allocate the scene object

    scene = [[Scene alloc] init];

    // Assign the view's MainController to self

    [openGLView setMainController:self];

    // Activate the display link now

    [openGLView startAnimation];

    isAnimating = YES;

}

- (void) dealloc

{

    [scene release];

    [super dealloc];

}

- (Scene*) scene

{

    return scene;

}

- (CFAbsoluteTime) renderTime

{

    return renderTime;

}

- (void) setRenderTime:(CFAbsoluteTime)time

{

    renderTime = time;

}

- (void) startAnimation

{

    if (!isAnimating)

    {

        if (!isInFullScreenMode)

            [openGLView startAnimation];

#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5

        else

            [fullScreenView startAnimation];

#endif

        isAnimating = YES;

    }

}

- (void) stopAnimation

{

    if (isAnimating)

    {

        if (!isInFullScreenMode)

            [openGLView stopAnimation];

#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5

        else

            [fullScreenView stopAnimation];

#endif

        isAnimating = NO;

    }

}

- (void) toggleAnimation

{

    if (isAnimating)

        [self stopAnimation];

    else

        [self startAnimation];

}

- (void) keyDown:(NSEvent *)event

{

    unichar c = [[event charactersIgnoringModifiers] characterAtIndex:0];

    switch (c) {

        // [Esc] exits full-screen mode

        case 27:

            if (isInFullScreenMode)

                [self goWindow];

            break;

        // [space] toggles rotation of the globe

        case 32:

            [self toggleAnimation];

            break;

        // [W] toggles wireframe rendering

        case 'w':

        case 'W':

            [scene toggleWireframe];

            break;

        default:

            break;

    }

}

// Holding the mouse button and dragging the mouse changes the "roll" angle (y-axis) and the direction from which sunlight is coming (x-axis).

- (void)mouseDown:(NSEvent *)theEvent

{

    BOOL dragging = YES;

    NSPoint windowPoint;

    NSPoint lastWindowPoint = [theEvent locationInWindow];

    float dx, dy;

    BOOL wasAnimating = isAnimating;

    if (wasAnimating) {

        [self stopAnimation];

    }

    while (dragging)

    {

        theEvent = [[openGLView window] nextEventMatchingMask:NSLeftMouseUpMask | NSLeftMouseDraggedMask];

        windowPoint = [theEvent locationInWindow];

        switch ([theEvent type])

        {

            case NSLeftMouseUp:

                dragging = NO;

                break;

            case NSLeftMouseDragged:

                dx = windowPoint.x - lastWindowPoint.x;

                dy = windowPoint.y - lastWindowPoint.y;

                [scene setSunAngle:[scene sunAngle] - 1.0 * dx];

                [scene setRollAngle:[scene rollAngle] - 0.5 * dy];

                lastWindowPoint = windowPoint;

                if (isInFullScreenMode) {

#if MAC_OS_X_VERSION_MIN_REQUIRED > MAC_OS_X_VERSION_10_5

                    [fullScreenView display];

#else

                    [scene render];

                    CGLFlushDrawable(fullScreenContextObj);

#endif

                }

                else {

                    [openGLView display];

                }

                break;

            default:

                break;

        }

    }

    if (wasAnimating) {

        [self startAnimation];

        renderTime = CFAbsoluteTimeGetCurrent();

    }

}

@end