GLSLShowpiece Lite/Exhibits/Earth/Earth.m

//-------------------------------------------------------------------------
//
//  File: Earth.m
//
//  Abstract: Earth GLSL Exhibit
//           
//  Disclaimer: IMPORTANT:  This Apple software is supplied to you by
//  Apple Inc. ("Apple") in consideration of your agreement to the
//  following terms, and your use, installation, modification or
//  redistribution of this Apple software constitutes acceptance of these
//  terms.  If you do not agree with these terms, please do not use,
//  install, modify or redistribute this Apple software.
//  
//  In consideration of your agreement to abide by 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 Apple
//  Software, with or without modifications, in source and/or binary forms;
//  provided that if you 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. 
//  Neither the name, trademarks, service marks or logos of Apple Inc.
//  may be used to 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 WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND
//  OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
//  
//  IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
//  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
//  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
//  INTERRUPTION) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION,
//  MODIFICATION AND/OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED
//  AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
//  STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
//  POSSIBILITY OF SUCH DAMAGE.
// 
//  Copyright (c) 2004-2007 Apple Inc., All rights reserved.
//
//-------------------------------------------------------------------------
 
#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