/opengles/redbook/planet.c

  1/*
  2 * License Applicability. Except to the extent portions of this file are
  3 * made subject to an alternative license as permitted in the SGI Free
  4 * Software License B, Version 1.1 (the "License"), the contents of this
  5 * file are subject only to the provisions of the License. You may not use
  6 * this file except in compliance with the License. You may obtain a copy
  7 * of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
  8 * Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
  9 * 
 10 * http://oss.sgi.com/projects/FreeB
 11 * 
 12 * Note that, as provided in the License, the Software is distributed on an
 13 * "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
 14 * DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
 15 * CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
 16 * PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
 17 * 
 18 * Original Code. The Original Code is: OpenGL Sample Implementation,
 19 * Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
 20 * Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
 21 * Copyright in any portions created by third parties is as indicated
 22 * elsewhere herein. All Rights Reserved.
 23 * 
 24 * Additional Notice Provisions: The application programming interfaces
 25 * established by SGI in conjunction with the Original Code are The
 26 * OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
 27 * April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
 28 * 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
 29 * Window System(R) (Version 1.3), released October 19, 1998. This software
 30 * was created using the OpenGL(R) version 1.2.1 Sample Implementation
 31 * published by SGI, but has not been independently verified as being
 32 * compliant with the OpenGL(R) version 1.2.1 Specification.
 33 *
 34 */
 35
 36/*
 37 *  planet.c
 38 *  This program shows how to composite modeling transformations
 39 *  to draw translated and rotated models.
 40 *  Interaction:  pressing the d and y keys (day and year)
 41 *  alters the rotation of the planet around the sun.
 42 */
 43#include <stdlib.h>
 44#include "ug.h"
 45
 46static int year = 0, day = 0;
 47
 48void init(void) 
 49{
 50   glClearColor (0.0, 0.0, 0.0, 0.0);
 51   glShadeModel (GL_FLAT);
 52}
 53
 54void display(UGWindow uwin)
 55{
 56   glClear (GL_COLOR_BUFFER_BIT);
 57   glColor4f (1.0f, 1.0f, 1.0f, 1.0f);
 58
 59   glPushMatrix();
 60   ugWireSpheref(1.0, 20, 16);   /* draw sun */
 61   glRotatef ((GLfloat) year, 0.0, 1.0, 0.0);
 62   glTranslatef (2.0, 0.0, 0.0);
 63   glRotatef ((GLfloat) day, 0.0, 1.0, 0.0);
 64   ugWireSpheref(0.2, 10, 8);    /* draw smaller planet */
 65   glPopMatrix();
 66   ugSwapBuffers(uwin);
 67}
 68
 69void reshape (UGWindow uwin, int w, int h)
 70{
 71   glViewport (0, 0, (GLsizei) w, (GLsizei) h); 
 72   glMatrixMode (GL_PROJECTION);
 73   glLoadIdentity ();
 74   ugluPerspectivef(60.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);
 75   glMatrixMode(GL_MODELVIEW);
 76   glLoadIdentity();
 77   ugluLookAtf(0.0f, 0.0f, 5.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f);
 78}
 79
 80void keyboard (UGWindow uwin, int key, int x, int y)
 81{
 82   switch (key) {
 83      case 'd':
 84         day = (day + 10) % 360;
 85         ugPostRedisplay(uwin);
 86         break;
 87      case 'D':
 88         day = (day - 10) % 360;
 89         ugPostRedisplay(uwin);
 90         break;
 91      case 'y':
 92         year = (year + 5) % 360;
 93         ugPostRedisplay(uwin);
 94         break;
 95      case 'Y':
 96         year = (year - 5) % 360;
 97         ugPostRedisplay(uwin);
 98         break;
 99      case 27:
100         exit(0);
101         break;
102      default:
103         break;
104   }
105}
106
107int main(int argc, char** argv)
108{
109   UGCtx ug = ugInit();
110   UGWindow uwin = ugCreateWindow (ug, "", argv[0], 500, 500, 100, 100);
111   init ();
112   ugDisplayFunc(uwin, display); 
113   ugReshapeFunc(uwin, reshape);
114   ugKeyboardFunc(uwin, keyboard);
115   ugMainLoop(ug);
116   return 0;
117}