/*

File: VideoMixView.m

Abstract:   The VideoMixView is a subclass of NSOpenGLView.

        Here you find the code for the view interaction as

        well as the setup of the OpenGL context with the

        setting up of the OpenGL state.

Version: 1.0

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*/ 

#import "VideoMixView.h"

#import <OpenGL/gl.h>

#import <OpenGL/glext.h>

#import "LiveVideoMixerController.h"

@implementation VideoMixView

//--------------------------------------------------------------------------------------------------

- (void)awakeFromNib

{

    // setup the pthread lock. We will use this lock to make sure the OpenGL surface is only

    // getting called from one thread at a time.

    pthread_mutexattr_t attr;

    pthread_mutexattr_init(&attr);

    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);  // the recursive thread allows us to aquire the same lock again from the same thread

                                // but still lock against another thread

    pthread_mutex_init(&drawingLock, &attr);

}

//--------------------------------------------------------------------------------------------------

- (void)setupSharedContext:(NSRect)targetRect

{

    // in this example we use a shared context for some of the texture operations. Shared contexts help to get around thread safety issues

    sharedContextTargetRect = targetRect;

    NSOpenGLPixelFormatAttribute attributes[] = {

                                NSOpenGLPFAColorSize,  24,

                                NSOpenGLPFAAlphaSize,  8,

                                0,

                            };

    // create an offscreen OpenGL surface for the VideoOut - this allows us to render just the composited main video in QuickTime coordinates

    // without touching our output on the screen

    NSOpenGLPixelFormat *format = [[(NSOpenGLPixelFormat*)[NSOpenGLPixelFormat alloc] initWithAttributes:attributes] autorelease];

    _offscreenWindow = [[NSWindow alloc] initWithContentRect:targetRect styleMask:NSBorderlessWindowMask backing:NSBackingStoreNonretained defer:NO];

    _offscreenOpenGLView = [[NSOpenGLView alloc] initWithFrame:targetRect pixelFormat:format];

    [[_offscreenWindow contentView] addSubview:_offscreenOpenGLView];

    [_offscreenOpenGLView display];

    sharedContext = [[NSOpenGLContext alloc] initWithFormat:format shareContext:nil];

    [self setOpenGLContext:[[[NSOpenGLContext alloc] initWithFormat:[NSOpenGLView defaultPixelFormat] shareContext:sharedContext] autorelease]];

    [[self openGLContext] setView:self];

    [sharedContext setView: _offscreenOpenGLView];

    [sharedContext makeCurrentContext];

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glEnable( GL_BLEND );                   // enable blending

    glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );    // blend func for non premultiplied images

    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

    glHint(GL_CLIP_VOLUME_CLIPPING_HINT_EXT, GL_FASTEST);

    glViewport(0, 0, sharedContextTargetRect.size.width ,sharedContextTargetRect.size.height);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(0, sharedContextTargetRect.size.width, 0, sharedContextTargetRect.size.height, -1.0, 1.0);

    glClearColor(1.0, 0.0, 0.0, 1.0);

    glClear(GL_COLOR_BUFFER_BIT);

}

//--------------------------------------------------------------------------------------------------

- (NSOpenGLContext*)sharedContext

{

    return sharedContext;

}

//--------------------------------------------------------------------------------------------------

- (void)dealloc

{

    [sharedContext release];

    [_offscreenWindow release];

    [_offscreenOpenGLView release];

    pthread_mutex_destroy(&drawingLock);

    [super dealloc];

}

//--------------------------------------------------------------------------------------------------

//--------------------------------------------------------------------------------------------------

- (BOOL)isFlipped

{

    return YES;

}

//--------------------------------------------------------------------------------------------------

- (void)lock

{

    pthread_mutex_lock(&drawingLock);

    if(contextIsInitialized)

        [[self openGLContext] makeCurrentContext];

}

//--------------------------------------------------------------------------------------------------

- (void)unlock

{

    pthread_mutex_unlock(&drawingLock);

}

//--------------------------------------------------------------------------------------------------

- (void)update

{

    // The NSOpenGLView issues OpenGL calls in its update method. Therefore it is important to lock

    // around this call as it would otherwise run in conflict with our rendering thread

    [self lock];

    [super update];

    [self unlock];

}

//--------------------------------------------------------------------------------------------------

- (void)reshape     // scrolled, moved or resized

{

    needsReshape = YES; // reset the viewport etc. on the next draw

    // if we are not playing, force an immediate draw otherwise it will update with the next frame 

    // coming through. This makes the resize performance better as it reduces the number of redraws

    // espcially on the main thread

    if(![controller isPlaying]) 

    {

    [self setDirty:YES];

    [self flushOutput];

    }

}

//--------------------------------------------------------------------------------------------------

- (void)clear

{

    [self lock];

    // clear content

    glClearColor(0.0, 0.0, 0.0, 0.0);

    glClear(GL_COLOR_BUFFER_BIT);

    [self unlock];

}

//--------------------------------------------------------------------------------------------------

// flushOutput is our drawing call. It makes sure that the view coordinate system is setup

// properly and causes the controller object to draw its content if needed.

- (void)flushOutput

{

    [self lock];

    if(needsReshape)

    {

    NSRect      frame = [self frame];

    NSRect      bounds = [self bounds];

    GLfloat     minX, minY, maxX, maxY;

    minX = NSMinX(bounds);

    minY = NSMinY(bounds);

    maxX = NSMaxX(bounds);

    maxY = NSMaxY(bounds);

    [[self openGLContext] makeCurrentContext];

    [self update]; 

    // the first time we need to setup the OpenGL environment in this view

    if(!contextIsInitialized)

    {

        long swapInterval = 1;

        [[self openGLContext] setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval]; // synchronize the glFlush with the VBL

        glMatrixMode(GL_PROJECTION);

        glLoadIdentity();

        glEnable( GL_BLEND );                   // enable blending

        glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );    // blend func for non premultiplied images

        glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);

        glHint(GL_CLIP_VOLUME_CLIPPING_HINT_EXT, GL_FASTEST);

        contextIsInitialized = YES;

    }

    if(NSIsEmptyRect([self visibleRect])) 

    {

        glViewport(0, 0, 1, 1);

    } else {

        glViewport(0, 0,  frame.size.width ,frame.size.height);

    }

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    glOrtho(minX, maxX, maxY, minY, -1.0, 1.0);

    glClearColor(0.0, 0.0, 0.0, 0.0);

    glClear(GL_COLOR_BUFFER_BIT);

    needsReshape = NO;

    }

    if([self dirty])

    {

    [controller drawContent:[controller mainVideoRect] mainVideoOnly:NO];   // invoke the controller to draw all the video channels

    // render the main video in the shared context for VideoOut in full size

    [sharedContext makeCurrentContext];

    [controller drawContent:sharedContextTargetRect mainVideoOnly:YES];   // invoke the controller to draw all the video channels   

    }

    [self setDirty:NO];

    [self unlock];

}

//--------------------------------------------------------------------------------------------------

- (void)setDirty:(BOOL)inDirty

{

    dirty = inDirty;

}

//--------------------------------------------------------------------------------------------------

- (BOOL)dirty

{

    return dirty;

}

//--------------------------------------------------------------------------------------------------

- (void)mouseDown:(NSEvent *)theEvent

{

    // mouse handling is done in the controller as it handles the video channels 

    [controller mouseDown:(NSEvent *)theEvent]; 

}

@end