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

//

//  File: OpenGLQuadsUtilityToolkit.m

//

//  Abstract: Utility toolkit to generating data streams using quads

//           

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

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

#import "OpenGLQuadsUtilityToolkit.h"

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

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

@implementation OpenGLQuadsUtilityToolkit

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

- (id) initWithBounds:(NSRect)theBounds

{

    self = [super init];

    bounds.origin.x    = theBounds.origin.x;

    bounds.origin.y    = theBounds.origin.y;

    bounds.size.width  = theBounds.size.width;

    bounds.size.height = theBounds.size.height;

    return self;

} // init

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

- (void) dealloc

{

    // Notify the superclass

    [super dealloc];

} // dealloc

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

//

// This method demonstrates that a viewport-sized quad is equivalent in

// having a data stream generator. That is to say, in order to utilize 

// a fragment shader in an OpenGL pipeline, it is essential that one 

// should generate pixels. As a result, upon drawing a quad the size of 

// our viewport, one is generating a fragment for every pixel of our 

// destination texture. It should be noted that this is not part of 

// the computational process, as this is only the visualization of the 

// results.

//

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

- (void) quads

{

    glBegin( GL_QUADS );

        glTexCoord2f( 0.0f, 0.0f ); 

        glVertex2f( bounds.origin.x, bounds.origin.y );

        glTexCoord2f( bounds.size.width, 0.0f ); 

        glVertex2f( bounds.size.width, bounds.origin.y );

        glTexCoord2f( bounds.size.width, bounds.size.height ); 

        glVertex2f( bounds.size.width,  bounds.size.height );

        glTexCoord2f( 0.0f, bounds.size.height ); 

        glVertex2f( bounds.origin.x, bounds.size.height );

    glEnd();

} // quads

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

@end

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

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