progs/util/glutskel.c

   1 /* $Id: glutskel.c,v 1.1 1999/08/19 00:55:42 jtg Exp $ */
   2
   3 /*
   4  * A skeleton/template GLUT program
   5  *
   6  * Written by Brian Paul and in the public domain.
   7  */
   8
   9
  10 /*
  11  * $Log: glutskel.c,v $
  12  * Revision 1.1  1999/08/19 00:55:42  jtg
  13  * Initial revision
  14  *
  15  * Revision 1.2  1998/11/07 14:20:14  brianp
  16  * added simple rotation, animation of cube
  17  *
  18  * Revision 1.1  1998/11/07 14:14:37  brianp
  19  * Initial revision
  20  *
  21  */
  22
  23
  24 #include <stdio.h>
  25 #include <stdlib.h>
  26 #include <math.h>
  27 #include <GL/glut.h>
  28
  29
  30 static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
  31 static GLboolean Anim = GL_FALSE;
  32
  33
  34 static void Idle( void )
  35 {
  36    Xrot += 3.0;
  37    Yrot += 4.0;
  38    Zrot += 2.0;
  39    glutPostRedisplay();
  40 }
  41
  42
  43 static void Display( void )
  44 {
  45    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
  46
  47    glPushMatrix();
  48    glRotatef(Xrot, 1, 0, 0);
  49    glRotatef(Yrot, 0, 1, 0);
  50    glRotatef(Zrot, 0, 0, 1);
  51
  52    glutSolidCube(2.0);
  53
  54    glPopMatrix();
  55
  56    glutSwapBuffers();
  57 }
  58
  59
  60 static void Reshape( int width, int height )
  61 {
  62    glViewport( 0, 0, width, height );
  63    glMatrixMode( GL_PROJECTION );
  64    glLoadIdentity();
  65    glFrustum( -1.0, 1.0, -1.0, 1.0, 5.0, 25.0 );
  66    glMatrixMode( GL_MODELVIEW );
  67    glLoadIdentity();
  68    glTranslatef( 0.0, 0.0, -15.0 );
  69 }
  70
  71
  72 static void Key( unsigned char key, int x, int y )
  73 {
  74    const GLfloat step = 3.0;
  75    (void) x;
  76    (void) y;
  77    switch (key) {
  78       case 'a':
  79          Anim = !Anim;
  80          if (Anim)
  81             glutIdleFunc(Idle);
  82          else
  83             glutIdleFunc(NULL);
  84          break;
  85       case 'z':
  86          Zrot -= step;
  87          break;
  88       case 'Z':
  89          Zrot += step;
  90          break;
  91       case 27:
  92          exit(0);
  93          break;
  94    }
  95    glutPostRedisplay();
  96 }
  97
  98
  99 static void SpecialKey( int key, int x, int y )
 100 {
 101    const GLfloat step = 3.0;
 102    (void) x;
 103    (void) y;
 104    switch (key) {
 105       case GLUT_KEY_UP:
 106          Xrot -= step;
 107          break;
 108       case GLUT_KEY_DOWN:
 109          Xrot += step;
 110          break;
 111       case GLUT_KEY_LEFT:
 112          Yrot -= step;
 113          break;
 114       case GLUT_KEY_RIGHT:
 115          Yrot += step;
 116          break;
 117    }
 118    glutPostRedisplay();
 119 }
 120
 121
 122 static void Init( void )
 123 {
 124    /* setup lighting, etc */
 125    glEnable(GL_DEPTH_TEST);
 126    glEnable(GL_LIGHTING);
 127    glEnable(GL_LIGHT0);
 128 }
 129
 130
 131 int main( int argc, char *argv[] )
 132 {
 133    glutInit( &argc, argv );
 134    glutInitWindowPosition( 0, 0 );
 135    glutInitWindowSize( 400, 400 );
 136    glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH );
 137    glutCreateWindow(argv[0]);
 138    glutReshapeFunc( Reshape );
 139    glutKeyboardFunc( Key );
 140    glutSpecialFunc( SpecialKey );
 141    glutDisplayFunc( Display );
 142    Init();
 143    glutMainLoop();
 144    return 0;
 145 }