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

//

//  File: OpenGLController.m

//

//  Abstract: Controller for passing data to the filter and updating

//            the OpenGL view with the results of the computation

//           

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

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

#import "OpenGLController.h"

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

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

@implementation OpenGLController

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

- (void) initFilter

{

    self = [super init];

    textureSize = NSMakeSize( 1024, 1024 );     // Texture size = array size = 1024 x 1024

    dataBounds  = NSMakeRect( -1, -1, 1, 1 );   // Data bounds = orthographic projection 2D range

    // Dictionary for the uniform(s) associated with our fragment shader

    NSArray      *theUniformKeys       = [NSArray arrayWithObjects: @"textureUnit", nil];

    NSArray      *theUniformValues     = [NSArray arrayWithObjects: [NSNumber numberWithInt:0], nil];

    NSDictionary *theUniformDictionary = [NSDictionary dictionaryWithObjects:theUniformValues forKeys:theUniformKeys];

    // Instantiate a filter with the fragment shader, uniforms, data domain, 

    // and data capacity the size of our texture

    filter = [[OpenGLFilterUtilityToolKit alloc] initWithFilterInAppBundle:@"LaplacianEdgeDetectionFilter" 

                                                        uniformDictionary:theUniformDictionary

                                                        bounds:dataBounds

                                                        size:textureSize];

} // initFilter

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

- (id) init

{

    // Initialize the Laplacian edge detection filter and its uniforms

    [self initFilter];

    // To demonstrate the capabilities of our filter, instantiate a rotating model

    // object so that we can continously generate and feed data into our filter

    models = [[OpenGLRotateModels alloc] init];

    return self;

} // initWithTimerAttributes

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

- (void) dealloc

{

    // The models are no longer needed

    [models dealloc];

    // The filter is no longer needed

    [filter dealloc];

    // Notify the superclass

    [super dealloc];

} // dealloc

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

#pragma mark -- Reshaping & updating the state --

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

- (void) reshape:(NSRect)theBounds

{

    [filter resize:theBounds];

} // reshape

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

#pragma mark -- Updating & Rendering textures --

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

//

// This method updates the texture by rendering the models (a rotating

// Stanford Bunny and 3 tori) and copying the image to a texture. Further-

// more in a second pass we render again by using the generated texture 

// as input to the installed filter.  The results produced by the filter 

// are then copied to the allocated texture. The resulting texture is 

// then used for visualizing the results of our computation.

//

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

- (void) update 

{

    [filter prepare];

    [models rotate];

    [filter run];

} // update

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

@end

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

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