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

//

//  File: QTCVOpenGLView.m

//

//  Abstract: Main view class

//           

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//  Copyright (c) 2008-2011 Apple Inc., All rights reserved.

//

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

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

#import "OpenGLQuad.h"

#import "OpenGLTeapot.h"

#import "CVGLImagebuffer.h"

#import "QTCVOpenGLView.h"

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

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

#pragma mark -

#pragma mark Private - Data Structures

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

struct QTCVOpenGLViewData

{

    CVGLImagebuffer *imagebuffer;

    OpenGLQuad      *quad;

    OpenGLTeapot    *teapot;

    GeometryType     geometry;

};

typedef struct QTCVOpenGLViewData   QTCVOpenGLViewData;

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

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

#pragma mark -

#pragma mark Private - Methods

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

@interface QTCVOpenGLView(Private)

- (void) deleteQuad;

- (void) deleteTeapot;

- (void) deleteImagebuffer;

- (void) deleteObjects;

- (void) drawObjects;

- (void) prepareQuad:(const NSSize *)theFrameSize;

- (void) prepareTeapot:(const NSSize *)theFrameSize;

- (void) prepareImagebuffer:(const NSSize *)theFrameSize;

@end

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

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

#pragma mark -

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

@implementation QTCVOpenGLView

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

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

#pragma mark -

#pragma mark Public - Application Startup

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

//

// Initialize

//

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

- (void) awakeFromNib

{

    mpQTCVGLView = (QTCVOpenGLViewDataRef)malloc(sizeof(QTCVOpenGLViewData));

    if( mpQTCVGLView != NULL )

    {

        mpQTCVGLView->geometry    = kGeometryQuad;

        mpQTCVGLView->teapot      = nil;

        mpQTCVGLView->quad        = nil;

        mpQTCVGLView->imagebuffer = nil;

    } // if

} // awakeFromNib

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

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

#pragma mark -

#pragma mark Public - Destructor

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

- (void) deleteQuad

{

    if( mpQTCVGLView->quad )

    {

        [mpQTCVGLView->quad release];

        mpQTCVGLView->quad = nil;

    } // if

} // deleteQuad

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

- (void) deleteTeapot

{

    if( mpQTCVGLView->teapot )

    {

        [mpQTCVGLView->teapot release];

        mpQTCVGLView->teapot = nil;

    } // if

} // deleteTeapot

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

- (void) deleteImagebuffer

{

    if( mpQTCVGLView->imagebuffer )

    {

        [mpQTCVGLView->imagebuffer release];

        mpQTCVGLView->imagebuffer = nil;

    } // if

} // deleteImagebuffer

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

- (void) deleteObjects

{

    [self deleteImagebuffer];

    [self deleteQuad];

    [self deleteTeapot];

} // deleteObjects

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

- (void) cleanUp

{

    [super cleanUp];

    if( mpQTCVGLView != NULL )

    {

        [self deleteObjects];

        free( mpQTCVGLView );

        mpQTCVGLView = NULL;

    } // if

} // cleanUp

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

- (void) dealloc 

{

    [self cleanUp];

    [super dealloc];

} // dealloc

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

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

#pragma mark -

#pragma mark Public - Draw into a OpenGL view

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

- (void) drawObjects

{

    if( mpQTCVGLView->geometry == kGeometryTeapot ) 

    {

        [mpQTCVGLView->teapot display];

    } // if

    else

    {

        [mpQTCVGLView->quad display];

    } // else

} // drawObjects

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

- (void) drawScene

{

    if( [self isValid] )

    {

        // Update the imagebuffer

        [mpQTCVGLView->imagebuffer update:[self pixelBuffer]];

        // Update the viewport properties

        [self updateViewport];

        // Get the texture from the imagebuffer

        [mpQTCVGLView->imagebuffer bind];

        // Draw the 3D objects

        [self drawObjects];

        // Disable texture target

        [mpQTCVGLView->imagebuffer unbind];

    } // if

} // drawScene

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

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

#pragma mark -

#pragma mark Private - Initialize OpenGL resources for a movie

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

- (void) prepareQuad:(const NSSize *)theFrameSize

{

    // Delete the old quad object

    [self deleteQuad];

    // Instantiate a new quad object

    mpQTCVGLView->quad = [OpenGLQuad new];

    if( mpQTCVGLView->quad )

    {

        GLfloat texCoords[8];

        texCoords[0] = 0.0f;

        texCoords[1] = 0.0f;

        texCoords[2] = 0.0f;

        texCoords[3] = theFrameSize->height;

        texCoords[4] = theFrameSize->width;

        texCoords[5] = theFrameSize->height;

        texCoords[6] = theFrameSize->width;

        texCoords[7] = 0.0f;

        [mpQTCVGLView->quad setSize:theFrameSize];

        [mpQTCVGLView->quad setTexCoords:texCoords];

        [mpQTCVGLView->quad acquire];

    } // if

} // prepareQuad

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

- (void) prepareTeapot:(const NSSize *)theFrameSize

{

    // Delete the old teapot object

    [self deleteTeapot];

    // Instantiate a new teapot object

    mpQTCVGLView->teapot = [[OpenGLTeapot alloc] initTeapotWithPListInAppBundle:@"Teapot"

                                                                           size:theFrameSize

                                                                         target:[mpQTCVGLView->imagebuffer target]];

} // prepareTeapot

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

- (void) prepareImagebuffer:(const NSSize *)theFrameSize

{

    // Delete the old CoreVideo imagebuffer

    [self deleteImagebuffer];

    // Instantiate a new pbo object

    mpQTCVGLView->imagebuffer = [[CVGLImagebuffer alloc] initImagebufferWithSize:theFrameSize

                                                                          target:GL_TEXTURE_RECTANGLE_ARB

                                                                          format:[self format]];

} // prepareImagebuffer

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

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

#pragma mark -

#pragma mark Public - Acquire OpenGL Resources

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

//

// Concrete implementation in order to acquire 3D objects.

//

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

- (void) prepareScene

{

    NSSize frameSize = [self size];

    [self prepareImagebuffer:&frameSize];

    [self prepareQuad:&frameSize];

    [self prepareTeapot:&frameSize];

} // prepareScene

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

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

#pragma mark -

#pragma mark Public - Accessors

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

//

// Geometry for drawing

//

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

- (void) setGeometry:(const GeometryType)theGeometry;

{

    mpQTCVGLView->geometry = theGeometry;

} // setGeometry

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

@end

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

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