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

//

//  File: Gooch.m

//

//  Abstract: Gooch GLSL Exhibit

//           

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

#import "Gooch.h"

static const GLint kNumGoochColors      = 3;

static const GLint kGoochTransitionTime = 30;

static const GLint kGoochIdleTime       = 250;

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

                                                    { 0.6, 0.6, 0.0 },

                                                    { 1.0, 0.7, 0.1 },

                                                    { 0.5, 0.7, 0.2 }

                                                };

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

                                                    { 0.0, 0.0, 0.6 },

                                                    { 0.3, 0.1, 0.5 },

                                                    { 0.0, 0.0, 0.5 }

                                                };

@implementation Gooch

- (void) setupColors

{

    currentColor    = 0;

    colorCyclePause = kGoochIdleTime;

    memmove(warm, kGoochWarmColors[currentColor], sizeof(warm));

    memmove(cool, kGoochCoolColors[currentColor], sizeof(cool));

} // setupColors

- (void) setupUniforms

{

    glUseProgramObjectARB(programObject);

    glUniform3fvARB([self getUniformLocation:programObject uniformName:"WarmColor"], 1, warm);

    glUniform3fvARB([self getUniformLocation:programObject uniformName:"CoolColor"], 1, cool);

    glUniform3fARB([self getUniformLocation:programObject uniformName:"SurfaceColor"], 0.75, 0.75, 0.75);

    glUniform3fARB([self getUniformLocation:programObject uniformName:"LightPosition"], 0.0, 10.0, 0.0);

    glUniform1fARB([self getUniformLocation:programObject uniformName:"DiffuseWarm"], 0.4);

    glUniform1fARB([self getUniformLocation:programObject uniformName:"DiffuseCool"], 0.4);

} // setupUniforms

- (void) initLazy

{

    [super initLazy];

    // Setup GLSL

    // Here we get a new model

    model = [[Models alloc] init];

    // Load vertex and fragment shader

    [self loadShadersFromResource:@"Gooch" ];

    // Initialize warm & cool colors

    [self setupColors];

    // Setup uniforms

    [self setupUniforms];

} // initLazy

- (void) dealloc

{

    [model dealloc];

    [super dealloc];

} // dealloc

- (NSString *) name

{

    return @"Gooch";

} // name

- (NSString *) descriptionFilename

{

    return [appBundle pathForResource: @"Gooch" ofType: @"rtf"];;

} // descriptionFilename

- (void) animateColors

{

    if((--colorCyclePause) < 0)

    {

        if(colorCyclePause > -kGoochTransitionTime)

        {

            GLfloat lerp      = (float)colorCyclePause / (float)(-kGoochTransitionTime);

            GLint   nextColor = (currentColor == (kNumGoochColors-1)) ? 0 : currentColor+1;

            warm[0] = kGoochWarmColors[nextColor][0] * lerp + kGoochWarmColors[currentColor][0] * (1.0f-lerp);

            warm[1] = kGoochWarmColors[nextColor][1] * lerp + kGoochWarmColors[currentColor][1] * (1.0f-lerp);

            warm[2] = kGoochWarmColors[nextColor][2] * lerp + kGoochWarmColors[currentColor][2] * (1.0f-lerp);

            cool[0] = kGoochCoolColors[nextColor][0] * lerp + kGoochCoolColors[currentColor][0] * (1.0f-lerp);

            cool[1] = kGoochCoolColors[nextColor][1] * lerp + kGoochCoolColors[currentColor][1] * (1.0f-lerp);

            cool[2] = kGoochCoolColors[nextColor][2] * lerp + kGoochCoolColors[currentColor][2] * (1.0f-lerp);

        } // if

        else

        {

            colorCyclePause = kGoochIdleTime;

            currentColor = (currentColor == (kNumGoochColors-1)) ? 0 : currentColor+1;

        } // else

        glUniform3fvARB([self getUniformLocation:programObject uniformName:"WarmColor"], 1, warm);

        glUniform3fvARB([self getUniformLocation:programObject uniformName:"CoolColor"], 1, cool);

    } // if

} // 

- (void) drawSilhouetteEdges

{

    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);

} // drawSilhouetteEdges

- (void) renderFrame

{

    [super renderFrame];

    glUseProgramObjectARB(programObject);

    // Animate through the different warm and cool colors

    [self animateColors];

    // Pick a geometry to use

    [model drawModel:kModelSolidTeapot];

    glUseProgramObjectARB(NULL);

    // Draw the silhouette edges

    [self drawSilhouetteEdges];

    [model drawModel:kModelSolidTeapot];

    glPopAttrib();

} // renderFrame

@end