/*

File: Earth.m

Abstract: Earth Exhibit

 Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple

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 subject to these terms, Apple grants you a personal, non-exclusive

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 Software, with or without modifications, in source and/or binary forms;

 provided that if you redistribute the Apple Software in its entirety and

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 text and disclaimers in all such redistributions of the Apple Software. 

 Neither the name, trademarks, service marks or logos of Apple Computer,

 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

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  Copyright (c) 2004-2006 Apple Computer, Inc., All rights reserved.

*/

#import "Earth.h"

@implementation Earth

- (id) init

{

    [super init];

    return self;

}

- (void) initLazy

{

    [super initLazy];

    /* Setup GLSL */

   {

      NSBundle *bundle;

      NSString *string, *vertex_string, *fragment_string;

        NSBitmapImageRep *bitmapimagerep;

        NSRect rect;

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

        /* day texture */

        glGenTextures(1, &day_texture);

        string = [bundle pathForResource: @"Day" ofType: @"jpg"];

        bitmapimagerep = LoadImage(string, 1);

        rect = NSMakeRect(0, 0, [bitmapimagerep pixelsWide], [bitmapimagerep pixelsHigh]);

        glBindTexture(GL_TEXTURE_2D, day_texture);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);   

        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, rect.size.width, rect.size.height, 0,

                         (([bitmapimagerep hasAlpha])?(GL_RGBA):(GL_RGB)), GL_UNSIGNED_BYTE, 

                         [bitmapimagerep bitmapData]);

        /* night texture */

        glGenTextures(1, &night_texture);

        string = [bundle pathForResource: @"Night" ofType: @"jpg"];

        bitmapimagerep = LoadImage(string, 1);

        rect = NSMakeRect(0, 0, [bitmapimagerep pixelsWide], [bitmapimagerep pixelsHigh]);

        glBindTexture(GL_TEXTURE_2D, night_texture);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);   

        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, rect.size.width, rect.size.height, 0,

                         (([bitmapimagerep hasAlpha])?(GL_RGBA):(GL_RGB)), GL_UNSIGNED_BYTE, 

                         [bitmapimagerep bitmapData]);

        /* clouds texture */

        glGenTextures(1, &clouds_texture);

        string = [bundle pathForResource: @"Clouds" ofType: @"jpg"];

        bitmapimagerep = LoadImage(string, 1);

        rect = NSMakeRect(0, 0, [bitmapimagerep pixelsWide], [bitmapimagerep pixelsHigh]);

        glBindTexture(GL_TEXTURE_2D, clouds_texture);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

        glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);   

        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, rect.size.width, rect.size.height, 0,

                         (([bitmapimagerep hasAlpha])?(GL_RGBA):(GL_RGB)), GL_UNSIGNED_BYTE, 

                         [bitmapimagerep bitmapData]);

        /* Load vertex and fragment shader */

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

      vertex_string   = [NSString stringWithContentsOfFile: vertex_string];

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

      fragment_string = [NSString stringWithContentsOfFile: fragment_string];

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

            NSLog(@"Failed to load Earth");

        /* Setup uniforms */

        glUseProgramObjectARB(program_object);

        glUniform3fARB(glGetUniformLocationARB(program_object, "LightPosition"), 3.0, 0.0, -3.0);

        glUniform1iARB(glGetUniformLocationARB(program_object, "EarthDay"), 0);

        glUniform1iARB(glGetUniformLocationARB(program_object, "EarthNight"), 1);

        glUniform1iARB(glGetUniformLocationARB(program_object, "EarthCloudGloss"), 2);

    }

}

- (void) dealloc

{

    [super dealloc];

    glDeleteTextures(1, &day_texture);

    glDeleteTextures(1, &night_texture);

    glDeleteTextures(1, &clouds_texture);

}

- (NSString *) name

{

    return @"Earth";

}

- (NSString *) descriptionFilename

{

    NSBundle *bundle;

    NSString *string;

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

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

    return string;

}

- (void) renderFrame

{

    [super renderFrame];

    glUseProgramObjectARB(program_object);

    glActiveTexture(GL_TEXTURE0);

    glBindTexture(GL_TEXTURE_2D, day_texture);

    glActiveTexture(GL_TEXTURE1);

    glBindTexture(GL_TEXTURE_2D, night_texture);

    glActiveTexture(GL_TEXTURE2);

    glBindTexture(GL_TEXTURE_2D, clouds_texture);

    glActiveTexture(GL_TEXTURE0);

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

    gluSphere(quadric, 0.5, 30, 30);

    glUseProgramObjectARB(NULL);

}

@end