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/opengles/redbook/light.c

http://ftk.googlecode.com/
C | 109 lines | 57 code | 9 blank | 43 comment | 2 complexity | df8f8fa77fd0940f25ce279520b66c85 MD5 | raw file
  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 *  light.c
 38 *  This program demonstrates the use of the OpenGL lighting
 39 *  model.  A sphere is drawn using a grey material characteristic.
 40 *  A single light source illuminates the object.
 41 */
 42#include <stdlib.h>
 43#include "ug.h"
 44
 45/*  Initialize material property, light source, lighting model,
 46 *  and depth buffer.
 47 */
 48void init(void) 
 49{
 50   GLfloat mat_specular[] = { 1.0, 1.0, 1.0, 1.0 };
 51   GLfloat mat_shininess[] = { 50.0 };
 52   GLfloat light_position[] = { 1.0, 1.0, 1.0, 0.0 };
 53
 54   glClearColor (0.0, 0.0, 0.0, 0.0);
 55   glShadeModel (GL_SMOOTH);
 56
 57   glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
 58   glMaterialfv(GL_FRONT_AND_BACK
 59	   , GL_SHININESS, mat_shininess);
 60   glLightfv(GL_LIGHT0, GL_POSITION, light_position);
 61
 62   glEnable(GL_LIGHTING);
 63   glEnable(GL_LIGHT0);
 64   glEnable(GL_DEPTH_TEST);
 65}
 66
 67void display(UGWindow uwin)
 68{
 69   glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 70   ugSolidSpheref(1.0, 20, 16);
 71   glFlush ();
 72   ugSwapBuffers(uwin);
 73}
 74
 75void reshape (UGWindow uwin, int w, int h)
 76{
 77   glViewport (0, 0, (GLsizei) w, (GLsizei) h);
 78   glMatrixMode (GL_PROJECTION);
 79   glLoadIdentity();
 80   if (w <= h)
 81      glOrthof(-1.5, 1.5, -1.5*(GLfloat)h/(GLfloat)w,
 82         1.5*(GLfloat)h/(GLfloat)w, -10.0, 10.0);
 83   else
 84      glOrthof(-1.5*(GLfloat)w/(GLfloat)h,
 85         1.5*(GLfloat)w/(GLfloat)h, -1.5, 1.5, -10.0, 10.0);
 86   glMatrixMode(GL_MODELVIEW);
 87   glLoadIdentity();
 88}
 89
 90void keyboard(UGWindow uwin, int key, int x, int y)
 91{
 92   switch (key) {
 93      case 27:
 94         exit(0);
 95         break;
 96   }
 97}
 98
 99int main(int argc, char** argv)
100{
101   UGCtx ug = ugInit();
102   UGWindow uwin = ugCreateWindow (ug, "UG_DEPTH", argv[0], 500, 500, 100, 100);
103   init ();
104   ugDisplayFunc(uwin, display); 
105   ugReshapeFunc(uwin, reshape);
106   ugKeyboardFunc(uwin, keyboard);
107   ugMainLoop(ug);
108   return 0;
109}