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

//

//  File: WoodShader.m

//

//  Abstract: Wood Shader GLSL Exhibit

//           

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//  Copyright (c) 2004-2007 Apple Inc., All rights reserved.

//

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

#import "WoodShader.h"

@implementation WoodShader

- (void) initGraininess

{

    graininess = [[UniformData alloc] init];

    [graininess initCurrent:0.3];

    [graininess initMax:0.3];

    [graininess initMin:0.2];

    [graininess initDelta:0.001];

} // initGraininess

- (void) initPeriod

{

    period = [[UniformData alloc] init];

    [period initCurrent:0.9];

    [period initMin:0.6];

    [period initMax:1.0];

    [period initDelta:0.001];

} // initPeriod

- (void) setupUniforms

{

    [self initGraininess];

    [self initPeriod];

    glUseProgramObjectARB(programObject);

    glUniform2fARB([self getUniformLocation:programObject uniformName:"seed"], -0.16, 6.21);

    glUniform1fvARB([self getUniformLocation:programObject uniformName:"graininess"], 1, [graininess current]);

    glUniform1fARB([self getUniformLocation:programObject uniformName:"linecount"], 11.73);

    glUniform1fvARB([self getUniformLocation:programObject uniformName:"lineperiod"], 1, [period current]);

    glUniform1fARB([self getUniformLocation:programObject uniformName:"linethickness"], 0.17);

    glUniform1fARB([self getUniformLocation:programObject uniformName:"lininess"], 0.06);       

    glUniform1iARB([self getUniformLocation:programObject uniformName:"Noise"], 0);

    glUniform3fARB([self getUniformLocation:programObject uniformName:"LightPosition"], 0.0, 0.0, 4.0);

} // setupUniforms

- (void) setupGeometry

{

    geometry = [[Surfaces alloc] init];

    [geometry setSurfaceType:kTriaxialTritorus];

    geometryDisplayList = [geometry getDisplayList];

} // setupGeometry

- (id) init

{

    [super init];

    return self;

} // init

- (void) initLazy

{

    [super initLazy];

    // Setup GLSL

    // Here we get a new surface geometry

    [self setupGeometry];

    // noise texture

    noiseTexture = [self loadNoiseTexture];

    // Load vertex and fragment shader

    [self loadShadersFromResource:@"WoodShader" ];

    // Setup uniforms

    [self setupUniforms];

} // initLazy

- (void) dealloc

{

    glDeleteTextures(1, &noiseTexture);

    [graininess dealloc];

    [period dealloc];

    [geometry dealloc];

    [super dealloc];

} // dealloc

- (NSString *) name

{

    return @"Wood Shader";

} // name

- (NSString *) descriptionFilename

{

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

} // descriptionFilename

- (void) renderFrame

{

    [super renderFrame];

    glScalef(0.25f, 0.25f, 0.25f);

    glUseProgramObjectARB(programObject);

    [graininess animate];

    [period animate];

    glUniform1fvARB([self getUniformLocation:programObject uniformName:"graininess"], 1, [graininess current]);

    glUniform1fvARB([self getUniformLocation:programObject uniformName:"lineperiod"], 1, [period current]); 

    glActiveTexture(GL_TEXTURE0);

    glBindTexture(GL_TEXTURE_3D, noiseTexture);

    // Use our display list

    glCallList(geometryDisplayList);

    glUseProgramObjectARB(NULL);

} // renderFrame

@end