/*

File: RayTracer.m

Abstract: RayTracer Exhibit

Author: Nick Burns

© Copyright 2006 Apple Computer, Inc. All rights reserved.

IMPORTANT:  This Apple software is supplied to 

you by Apple Computer, Inc. ("Apple") in 

consideration of your agreement to the following 

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not agree with these terms, please do not use, 

install, modify or redistribute this Apple 

software.

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the following terms, and subject to these terms, 

Apple grants you a personal, non-exclusive 

license, under Apple's copyrights in this 

original Apple software (the "Apple Software"), 

to use, reproduce, modify and redistribute the 

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redistribute the Apple Software in its entirety 

and without modifications, you must retain this 

notice and the following text and disclaimers in 

all such redistributions of the Apple Software. 

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endorse or promote products derived from the 

Apple Software without specific prior written 

permission from Apple.  Except as expressly 

stated in this notice, no other rights or 

licenses, express or implied, are granted by 

Apple herein, including but not limited to any 

patent rights that may be infringed by your 

derivative works or by other works in which the 

Apple Software may be incorporated.

The Apple Software is provided by Apple on an "AS 

IS" basis.  APPLE MAKES NO WARRANTIES, EXPRESS OR 

IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED 

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AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING 

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*/

#import "RayTracer.h"

@implementation RayTracer

- (id) init

{

    [super init];

    return self;

}

- (void) initLazy

{

    [super initLazy];

    /* Setup GLSL */

   {

      NSBundle *bundle;

      NSString *fragment_string;

      bundle = [NSBundle bundleForClass: [self class]];

        /* Load vertex and fragment shader */

      fragment_string = [bundle pathForResource: @"RayTracer" ofType: @"frag"];

      fragment_string = [NSString stringWithContentsOfFile: fragment_string];

        if ([self loadVertexShader: nil fragmentShader: fragment_string])

            NSLog(@"Failed to load RayTracer");

        /* Setup uniforms */

        glUseProgramObjectARB(program_object);

        glUniform2fARB(glGetUniformLocationARB(program_object, "frame"), 255.0, 255.0);

        glUniform3fARB(glGetUniformLocationARB(program_object, "lightPosition"), 10.0, 10.0, 8.0);

        glUniform3fARB(glGetUniformLocationARB(program_object, "lightColor"), 0.8, 0.8, 0.7);

        glUniform1fARB(glGetUniformLocationARB(program_object, "radius"), 0.25);

        glUniform3fARB(glGetUniformLocationARB(program_object, "sphereColor"), 0.3, 0.3, 0.8);

        glUniform3fARB(glGetUniformLocationARB(program_object, "spherePosition"), 0.0, 0.1, 0.0);

    }

}

- (void) dealloc

{

    [super dealloc];

}

- (NSString *) name

{

    return @"RayTracer";

}

- (NSString *) descriptionFilename

{

    NSBundle *bundle;

    NSString *string;

    bundle = [NSBundle bundleForClass: [self class]];

   string = [bundle pathForResource: @"RayTracer" ofType: @"rtf"];

    return string;

}

- (void) renderFrame

{

    [super renderFrame];

    glUseProgramObjectARB(program_object);

    GLint viewport[4];

    glGetIntegerv(GL_VIEWPORT,viewport);

    glUniform2fARB(glGetUniformLocationARB(program_object, "frame"), viewport[2], viewport[3]);

    glBegin(GL_QUADS);

    glNormal3f(0.0, 0.0, 1.0);

    glVertex2f(-0.5, -0.5);

    glVertex2f( 0.5, -0.5);

    glVertex2f( 0.5,  0.5);

    glVertex2f(-0.5,  0.5);

    glEnd();

    glUseProgramObjectARB(NULL);

    glPushAttrib(GL_COLOR_BUFFER_BIT | GL_ENABLE_BIT | GL_POLYGON_BIT);

    glEnable(GL_LINE_SMOOTH);

    glEnable(GL_BLEND);

    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glColor3f(1, 1, 1);

    glBegin(GL_LINE_LOOP);

    glVertex2f(-0.52, -0.52);

    glVertex2f( 0.52, -0.52);

    glVertex2f( 0.52,  0.52);

    glVertex2f(-0.52,  0.52);

    glEnd();

    glPopAttrib();

}

@end