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

//

//  File: Earth.m

//

//  Abstract: Earth GLSL Exhibit

//           

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

#import "Earth.h"

@implementation Earth

- (void) getTextures

{

    dayTexture    = [self loadTextureFromResource: @"Day" ];

    nightTexture  = [self loadTextureFromResource: @"Night" ];

    cloudsTexture = [self loadTextureFromResource: @"Clouds" ];

} // getTextures

- (void) setupUniforms

{

    glUseProgramObjectARB(programObject);

    glUniform3fARB([self getUniformLocation:programObject uniformName:"LightPosition"], 3.0, 0.0, -3.0);

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

    glUniform1iARB([self getUniformLocation:programObject uniformName:"EarthNight"], 1);

    glUniform1iARB([self getUniformLocation:programObject uniformName:"EarthCloudGloss"], 2);

} // setupUniforms

- (void) initLazy

{

    [super initLazy];

    // Setup GLSL

    // Get a model and set its quadric

    model = [[Models alloc] init];

    // get all the textures

    [self getTextures];

    // Load vertex and fragment shaders

    [self loadShadersFromResource:@"Earth" ];

    // Setup uniforms

    [self setupUniforms];

} // initLazy

- (void) deallocTextures

{

    glDeleteTextures(1, &dayTexture);

    glDeleteTextures(1, &nightTexture);

    glDeleteTextures(1, &cloudsTexture);

} // deallocTextures

- (void) dealloc

{

    [self deallocTextures];

    [model dealloc];

    [super dealloc];

} // dealloc

- (NSString *) name

{

    return @"Earth";

} // name

- (NSString *) descriptionFilename

{

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

} // descriptionFilename

- (void) renderFrame

{

    [super renderFrame];

    glUseProgramObjectARB(programObject);

    glActiveTexture(GL_TEXTURE0);

    glBindTexture(GL_TEXTURE_2D, dayTexture);

    glActiveTexture(GL_TEXTURE1);

    glBindTexture(GL_TEXTURE_2D, nightTexture);

    glActiveTexture(GL_TEXTURE2);

    glBindTexture(GL_TEXTURE_2D, cloudsTexture);

    glActiveTexture(GL_TEXTURE0);

    glRotatef(-90, 1.0, 0.0, 0.0);

    [model drawModel:kModelSolidSphere];

    glUseProgramObjectARB(NULL);

} // renderFrame

@end