/*

        File: AppController.m

    Abstract: Controller class.

     Version: 1.1

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    The Apple Software is provided by Apple on an "AS IS" basis.  APPLE

    MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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    Copyright (C) 2009 Apple Inc. All Rights Reserved.

*/

#import <OpenGL/CGLMacro.h>

#import "AppController.h"

#define kRenderFPS 60.0

@implementation AppController

- (void) applicationDidFinishLaunching:(NSNotification*)notification

{

    NSOpenGLPixelFormatAttribute    attributes[] = {NSOpenGLPFAAccelerated, NSOpenGLPFANoRecovery, NSOpenGLPFADoubleBuffer, NSOpenGLPFADepthSize, 24, 0};

    GLint                           swapInterval = 1;

    //Create the OpenGL context used to render the animation and attach it to the rendering view

    _glPixelFormat = [[NSOpenGLPixelFormat alloc] initWithAttributes:attributes];

    _glContext = [[NSOpenGLContext alloc] initWithFormat:_glPixelFormat shareContext:nil];

    [_glContext setValues:&swapInterval forParameter:NSOpenGLCPSwapInterval];

    [_glContext setView:renderView];

    //Prompt the user for a Quartz Composer composition immediately

    [self openComposition:nil];

    //We need to know when the rendering view frame changes so that we can update the OpenGL context

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(updateRenderView:) name:NSViewGlobalFrameDidChangeNotification object:renderView];

    //Create a timer which will regularly call our rendering method

    _renderTimer = [[NSTimer timerWithTimeInterval:(1.0 / (NSTimeInterval)kRenderFPS) target:self selector:@selector(_renderGLScene:) userInfo:nil repeats:YES] retain];

    [[NSRunLoop currentRunLoop] addTimer:_renderTimer forMode:NSDefaultRunLoopMode];

    [[NSRunLoop currentRunLoop] addTimer:_renderTimer forMode:NSModalPanelRunLoopMode];

    [[NSRunLoop currentRunLoop] addTimer:_renderTimer forMode:NSEventTrackingRunLoopMode];

    _startTime = -1.0;

}

- (IBAction) openComposition:(id)sender

{

    NSOpenPanel*                    openPanel = [NSOpenPanel openPanel];

    //Prompt the user for a Quartz Composer composition file

    [openPanel setAllowsMultipleSelection:NO];

    [openPanel setCanChooseDirectories:NO];

    [openPanel setCanChooseFiles:YES];

    if([openPanel runModalForDirectory:nil file:nil types:[NSArray arrayWithObject:@"qtz"]] == NSOKButton) {

        //Destroy the current pBuffer renderer and create a new one

        [_pBufferRenderer release];

        _pBufferRenderer = [[PBufferRenderer alloc] initWithCompositionPath:[openPanel filename] textureTarget:GL_TEXTURE_2D textureWidth:512 textureHeight:512 openGLContext:_glContext];

    }

}

- (void) _renderGLScene:(NSTimer*)timer

{

    CGLContextObj           cgl_ctx = [_glContext CGLContextObj]; //By using CGLMacro.h there's no need to set the current OpenGL context

    NSTimeInterval          time = [NSDate timeIntervalSinceReferenceDate];

    GLint                   viewport[4];

    //Compute the local time

    if(_startTime < 0.0)

    _startTime = time;

    time = time - _startTime;

    //Clear background

    glClearColor(0.25, 0.25, 0.25, 0.25);

    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    //Save & configure projection matrix

    glMatrixMode(GL_PROJECTION_MATRIX);

    glGetIntegerv(GL_VIEWPORT, viewport);

    glPushMatrix();

    glOrtho(-1.0, 1.0, -1.0 * (float)viewport[3] / (float)viewport[2], 1.0 * (float)viewport[3] / (float)viewport[2], -1.0, 1.0);

    //Save & configure modelview matrix (make it rotate with time)

    glMatrixMode(GL_MODELVIEW_MATRIX);

    glPushMatrix();

    glRotatef(time * 360.0 / 5, 0.0, 0.0, 1.0);

    //Configure texturing

    if(_pBufferRenderer) {

        [_pBufferRenderer updateTextureForTime:time];

        glEnable([_pBufferRenderer textureTarget]);

        glBindTexture([_pBufferRenderer textureTarget], [_pBufferRenderer textureName]);

        glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);

    }

    else

    glColor4f(1.0, 1.0, 1.0, 1.0);

    //Draw textured quad

    glBegin(GL_QUADS);

        glTexCoord2f([_pBufferRenderer textureCoordSMin], [_pBufferRenderer textureCoordTMin]);

        glVertex3f(-0.5, -0.5, 0.0);

        glTexCoord2f([_pBufferRenderer textureCoordSMax], [_pBufferRenderer textureCoordTMin]);

        glVertex3f(0.5, -0.5, 0.0);

        glTexCoord2f([_pBufferRenderer textureCoordSMax], [_pBufferRenderer textureCoordTMax]);

        glVertex3f(0.5, 0.5, 0.0);

        glTexCoord2f([_pBufferRenderer textureCoordSMin], [_pBufferRenderer textureCoordTMax]);

        glVertex3f(-0.5, 0.5, 0.0);

    glEnd();

    //Restore texturing settings

    if(_pBufferRenderer)

    glDisable([_pBufferRenderer textureTarget]);

    //Restore modelview and projection matrices

    glPopMatrix();

    glMatrixMode(GL_PROJECTION_MATRIX);

    glPopMatrix();

    //Display new frame

    [_glContext flushBuffer];

}

- (void) updateRenderView:(NSNotification*)notification

{

    CGLContextObj           cgl_ctx = [_glContext CGLContextObj]; //By using CGLMacro.h there's no need to set the current OpenGL context

    NSRect                  frame = [renderView frame];

    //Notify the OpenGL context its rendering view has changed

    [_glContext update];

    //Update the OpenGL viewport

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

    //Render OpenGL scene immediately

    [self _renderGLScene:nil];

}

- (BOOL) windowShouldClose:(id)sender

{

    //Quits the app when the window is closed

    [NSApp terminate:self];

    return YES;

}

- (void) applicationWillTerminate:(NSNotification*)notification

{

    //Stop the timer

    [_renderTimer invalidate];

    //Stop observing the rendering view

    [[NSNotificationCenter defaultCenter] removeObserver:self name:NSViewFrameDidChangeNotification object:renderView];

}

- (void) dealloc

{

    //Release our objects

    [_renderTimer release];

    [_pBufferRenderer release];

    [_glContext release];

    [_glPixelFormat release];

    [super dealloc];

}

@end