git.mutantstargoat.com Git - freeglut/blob - progs/demos/shapes/shapes.c

   1 /*
   2  * FreeGLUT Shapes Demo
   3  *
   4  * Written by Nigel Stewart November 2003
   5  *
   6  * This program is test harness for the sphere, cone
   7  * and torus shapes in FreeGLUT.
   8  *
   9  * Spinning wireframe and smooth shaded shapes are
  10  * displayed until the ESC or q key is pressed.  The
  11  * number of geometry stacks and slices can be adjusted
  12  * using the + and - keys.
  13  */
  14
  15 #include <GL/freeglut.h>
  16
  17 #include <stdlib.h>
  18
  19 static int slices = 16;
  20 static int stacks = 16;
  21
  22 /* GLUT callback Handlers */
  23
  24 static void
  25 resize(int width, int height)
  26 {
  27     const float ar = (float) width / (float) height;
  28
  29     glViewport(0, 0, width, height);
  30     glMatrixMode(GL_PROJECTION);
  31     glLoadIdentity();
  32     glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
  33
  34     glMatrixMode(GL_MODELVIEW);
  35     glLoadIdentity() ;
  36 }
  37
  38 static void
  39 display(void)
  40 {
  41     const double t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
  42     const double a = t*90.0;
  43
  44     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  45     glColor3d(1,0,0);
  46
  47     glPushMatrix();
  48         glTranslated(-2.4,1.2,-6);
  49         glRotated(60,1,0,0);
  50         glRotated(a,0,0,1);
  51         glutSolidSphere(1,slices,stacks);
  52     glPopMatrix();
  53
  54     glPushMatrix();
  55         glTranslated(0,1.2,-6);
  56         glRotated(60,1,0,0);
  57         glRotated(a,0,0,1);
  58         glutSolidCone(1,1,slices,stacks);
  59     glPopMatrix();
  60
  61     glPushMatrix();
  62         glTranslated(2.4,1.2,-6);
  63         glRotated(60,1,0,0);
  64         glRotated(a,0,0,1);
  65         glutSolidTorus(0.2,0.8,slices,stacks);
  66     glPopMatrix();
  67
  68     glPushMatrix();
  69         glTranslated(-2.4,-1.2,-6);
  70         glRotated(60,1,0,0);
  71         glRotated(a,0,0,1);
  72         glutWireSphere(1,slices,stacks);
  73     glPopMatrix();
  74
  75     glPushMatrix();
  76         glTranslated(0,-1.2,-6);
  77         glRotated(60,1,0,0);
  78         glRotated(a,0,0,1);
  79         glutWireCone(1,1,slices,stacks);
  80     glPopMatrix();
  81
  82     glPushMatrix();
  83         glTranslated(2.4,-1.2,-6);
  84         glRotated(60,1,0,0);
  85         glRotated(a,0,0,1);
  86         glutWireTorus(0.2,0.8,slices,stacks);
  87     glPopMatrix();
  88
  89     glutSwapBuffers();
  90 }
  91
  92
  93 static void
  94 key(unsigned char key, int x, int y)
  95 {
  96     switch (key)
  97     {
  98         case 27 :
  99         case 'q':
 100             exit(0);
 101             break;
 102
 103         case '+':
 104             slices++;
 105             stacks++;
 106             break;
 107
 108         case '-':
 109             if (slices>3 && stacks>3)
 110             {
 111                 slices--;
 112                 stacks--;
 113             }
 114             break;
 115     }
 116
 117     glutPostRedisplay();
 118 }
 119
 120 static void
 121 idle(void)
 122 {
 123     glutPostRedisplay();
 124 }
 125
 126 const GLfloat light_ambient[]  = { 0.0f, 0.0f, 0.0f, 1.0f };
 127 const GLfloat light_diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
 128 const GLfloat light_specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };
 129 const GLfloat light_position[] = { 2.0f, 5.0f, 5.0f, 0.0f };
 130
 131 const GLfloat mat_ambient[]    = { 0.7f, 0.7f, 0.7f, 1.0f };
 132 const GLfloat mat_diffuse[]    = { 0.8f, 0.8f, 0.8f, 1.0f };
 133 const GLfloat mat_specular[]   = { 1.0f, 1.0f, 1.0f, 1.0f };
 134 const GLfloat high_shininess[] = { 100.0f };
 135
 136 /* Program entry point */
 137
 138 int
 139 main(int argc, char *argv[])
 140 {
 141     glutInit(&argc, argv);
 142     glutInitWindowSize(640,480);
 143     glutInitWindowPosition (40,40);
 144     glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
 145
 146     glutCreateWindow("FreeGLUT Shapes");
 147
 148     glutReshapeFunc(resize);
 149     glutDisplayFunc(display);
 150     glutKeyboardFunc(key);
 151     glutIdleFunc(idle);
 152
 153     glClearColor(1,1,1,1);
 154     glEnable(GL_CULL_FACE);
 155     glCullFace(GL_BACK);
 156
 157     glEnable(GL_DEPTH_TEST);
 158     glDepthFunc(GL_LESS);
 159
 160     glEnable(GL_LIGHT0);
 161     glEnable(GL_NORMALIZE);
 162     glEnable(GL_COLOR_MATERIAL);
 163     glEnable(GL_LIGHTING);
 164
 165     glLightfv(GL_LIGHT0, GL_AMBIENT,  light_ambient);
 166     glLightfv(GL_LIGHT0, GL_DIFFUSE,  light_diffuse);
 167     glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
 168     glLightfv(GL_LIGHT0, GL_POSITION, light_position);
 169
 170     glMaterialfv(GL_FRONT, GL_AMBIENT,   mat_ambient);
 171     glMaterialfv(GL_FRONT, GL_DIFFUSE,   mat_diffuse);
 172     glMaterialfv(GL_FRONT, GL_SPECULAR,  mat_specular);
 173     glMaterialfv(GL_FRONT, GL_SHININESS, high_shininess);
 174
 175     glutMainLoop();
 176
 177     return EXIT_SUCCESS;
 178 }
 179