/*

File: Gooch.m

Abstract: Gooch Exhibit

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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*/

#import "Gooch.h"

#define NUM_GOOCH_COLORS         3

#define GOOCH_TRANSITION_TIME   30

#define GOOCH_IDLE_TIME        250

static const GLfloat gooch_warm_colors[3][3] = {

    { 0.6, 0.6, 0.0 },

    { 1.0, 0.7, 0.1 },

    { 0.5, 0.7, 0.2 },

};

static const GLfloat gooch_cool_colors[3][3] = {

    { 0.0, 0.0, 0.6 },

    { 0.3, 0.1, 0.5 },

    { 0.0, 0.0, 0.5 },

};

@implementation Gooch

- (id) init

{

    [super init];

    cur_color = 0;

    color_cycle_pause = GOOCH_IDLE_TIME;

    memcpy(warm, gooch_warm_colors[cur_color], sizeof(warm));

    memcpy(cool, gooch_cool_colors[cur_color], sizeof(cool));

    return self;

}

- (void) initLazy

{

    [super initLazy];

    /* Setup GLSL */

   {

      NSBundle *bundle;

      NSString *vertex_string, *fragment_string;

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

        /* Load vertex and fragment shader */

      vertex_string   = [bundle pathForResource: @"Gooch" ofType: @"vert"];

      vertex_string   = [NSString stringWithContentsOfFile: vertex_string];

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

      fragment_string = [NSString stringWithContentsOfFile: fragment_string];

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

            NSLog(@"Failed to load Gooch");

        /* Setup uniforms */

        glUseProgramObjectARB(program_object);

        glUniform3fvARB(glGetUniformLocationARB(program_object, "WarmColor"), 1, warm);

        glUniform3fvARB(glGetUniformLocationARB(program_object, "CoolColor"), 1, cool);

        glUniform3fARB(glGetUniformLocationARB(program_object, "SurfaceColor"), 0.75, 0.75, 0.75);

        glUniform3fARB(glGetUniformLocationARB(program_object, "LightPosition"), 0.0, 10.0, 0.0);

        glUniform1fARB(glGetUniformLocationARB(program_object, "DiffuseWarm"), 0.4);

        glUniform1fARB(glGetUniformLocationARB(program_object, "DiffuseCool"), 0.4);

    }

}

- (void) dealloc

{

    [super dealloc];

}

- (NSString *) name

{

    return @"Gooch";

}

- (NSString *) descriptionFilename

{

    NSBundle *bundle;

    NSString *string;

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

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

    return string;

}

- (void) renderFrame

{

    [super renderFrame];

    glUseProgramObjectARB(program_object);

    /* Animate through the different warm and cool colors */

    if((--color_cycle_pause) < 0)

    {

        if(color_cycle_pause > -GOOCH_TRANSITION_TIME)

        {

            float lerp = (float)color_cycle_pause / (float)(-GOOCH_TRANSITION_TIME);

            int nextColor = (cur_color == (NUM_GOOCH_COLORS-1)) ? 0 : cur_color+1;

            warm[0] = gooch_warm_colors[nextColor][0] * lerp + gooch_warm_colors[cur_color][0] * (1.0f-lerp);

            warm[1] = gooch_warm_colors[nextColor][1] * lerp + gooch_warm_colors[cur_color][1] * (1.0f-lerp);

            warm[2] = gooch_warm_colors[nextColor][2] * lerp + gooch_warm_colors[cur_color][2] * (1.0f-lerp);

            cool[0] = gooch_cool_colors[nextColor][0] * lerp + gooch_cool_colors[cur_color][0] * (1.0f-lerp);

            cool[1] = gooch_cool_colors[nextColor][1] * lerp + gooch_cool_colors[cur_color][1] * (1.0f-lerp);

            cool[2] = gooch_cool_colors[nextColor][2] * lerp + gooch_cool_colors[cur_color][2] * (1.0f-lerp);

        }

        else

        {

            color_cycle_pause = GOOCH_IDLE_TIME;

            cur_color = (cur_color == (NUM_GOOCH_COLORS-1)) ? 0 : cur_color+1;

        }

        glUniform3fvARB(glGetUniformLocationARB(program_object, "WarmColor"), 1, warm);

        glUniform3fvARB(glGetUniformLocationARB(program_object, "CoolColor"), 1, cool);

    }

    teapot(16, 0.5, GL_FILL);

    glUseProgramObjectARB(NULL);

    /* Draw the silhouette edges */

    glPushAttrib(GL_COLOR_BUFFER_BIT | GL_POLYGON_BIT | GL_LINE_BIT | GL_CURRENT_BIT);

    glLineWidth(4.0);

    glColor3f(0,0,0);

    glCullFace(GL_FRONT);

    glEnable(GL_CULL_FACE);

    glEnable(GL_LINE_SMOOTH);

    glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    glEnable(GL_BLEND);

    glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);

    teapot(16, 0.5, GL_FILL);

    glPopAttrib();

}

@end