/*

Project: CIColorTracking

File: VideoCIView.m

Abstract: 

This is the implementation file for VideoCIView, a class that sets up and manages the OpenGL context that shows the video.

Version 1.0

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*/

#import "VideoCIView.h"

#import <OpenGL/OpenGL.h>

#import <OpenGL/gl.h>

@implementation VideoCIView

+ (NSOpenGLPixelFormat *)defaultPixelFormat

{

    static NSOpenGLPixelFormat *pf;

    if (pf == nil)

    {

    // You must make sure that the pixel format of the context does not 

    // have a recovery renderer is important. Otherwise CoreImage may not be able to

    // create contexts that share textures with this context.

    static const NSOpenGLPixelFormatAttribute attr[] = {

        NSOpenGLPFAAccelerated,

        NSOpenGLPFANoRecovery,

        NSOpenGLPFAColorSize, 32,

#if MAC_OS_X_VERSION_MAX_ALLOWED > MAC_OS_X_VERSION_10_4

        NSOpenGLPFAAllowOfflineRenderers,

#endif

        0

    };

    pf = [[NSOpenGLPixelFormat alloc] initWithAttributes:(void *)&attr];

    }

    return pf;

}

- (void)dealloc

{

    [_image release];

    [_context release];

    [super dealloc];

}

- (CIImage *)image

{

    return [[_image retain] autorelease];

}

- (void)setImage:(CIImage *)image

{

    if (_image != image)

    {

        [_image release];

        _image = [image retain];

    }

    [self render];

}

- (void)prepareOpenGL

{

    GLint parm = 1;

    //  Set the swap interval to 1 to ensure that buffers swaps occur only during the vertical retrace of the monitor.

    [[self openGLContext] setValues:&parm forParameter:NSOpenGLCPSwapInterval];

    // To ensure best performance, disbale everything you don't need. 

    glDisable (GL_ALPHA_TEST);

    glDisable (GL_DEPTH_TEST);

    glDisable (GL_SCISSOR_TEST);

    glDisable (GL_BLEND);

    glDisable (GL_DITHER);

    glDisable (GL_CULL_FACE);

    glColorMask (GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);

    glDepthMask (GL_FALSE);

    glStencilMask (0);

    glClearColor (0.0f, 0.0f, 0.0f, 0.0f);

    glHint (GL_TRANSFORM_HINT_APPLE, GL_FASTEST);

    _needsReshape = YES;

}

// Called when the user scrolls, moves, or resizes the view.

- (void)reshape     

{

    // Resets the viewport on the next draw operation.

    _needsReshape = YES;    

}

- (void)updateMatrices

{

    NSRect  visibleRect = [self visibleRect];

    NSRect  mappedVisibleRect = NSIntegralRect([self convertRect: visibleRect toView: [self enclosingScrollView]]);

    [[self openGLContext] update];

    // Install an orthographic projection matrix (no perspective)

    // with the origin in the bottom left and one unit equal to one device pixel.  

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

    glMatrixMode (GL_PROJECTION);

    glLoadIdentity ();

    glOrtho(visibleRect.origin.x,

        visibleRect.origin.x + visibleRect.size.width,

        visibleRect.origin.y,

        visibleRect.origin.y + visibleRect.size.height,

        -1, 1);

    glMatrixMode (GL_MODELVIEW);

    glLoadIdentity ();

    _needsReshape = NO;

}

- (void)render

{

    NSRect      frame = [self bounds];

    [[self openGLContext] makeCurrentContext];

    if (_needsReshape)

    {

        [self updateMatrices];

        glClear (GL_COLOR_BUFFER_BIT);

    }

    CGRect      imageRect = [_image extent];

    CGRect      destRect = *((CGRect*)&frame);

    [[self ciContext] drawImage:_image inRect:destRect fromRect:imageRect];

    // Flush the OpenGL command stream. If the view is double-buffered

    // you should  replace  this call with [[self openGLContext]

    glFlush ();

}

- (CIContext*)ciContext

{

    // Allocate a CoreImage rendering context using the view's OpenGL

    // context as its destination if none already exists. 

    // You must do this before sending any queries to the CIContext. 

    if (_context == nil)

    {

    [[self openGLContext] makeCurrentContext];

    NSOpenGLPixelFormat *pf;

    pf = [self pixelFormat];

    if (pf == nil)

        pf = [[self class] defaultPixelFormat];

    _context = [[CIContext contextWithCGLContext: CGLGetCurrentContext()

             pixelFormat: [pf CGLPixelFormatObj] options: nil] retain];

    }

    return _context;

}

@end