Added d/D keys to change viewing distance, 'a' to toggle animation

[mesa.git] / progs / demos / gears.c

diff --git a/progs/demos/gears.c b/progs/demos/gears.c
index ac9088505326a1b8f8df739aee18082c42d3b17f..7abbd3670bd4def368ad2f36718c6ade46aaf72d 100644 (file)
--- a/progs/demos/gears.c
+++ b/progs/demos/gears.c
@@ -1,5 +1,3 @@
-/* $Id: gears.c,v 1.6 2000/04/06 02:22:59 brianp Exp $ */
-
 /*
  * 3-D gear wheels.  This program is in the public domain.
  *
@@ -28,6 +26,11 @@
 static GLint T0 = 0;
 static GLint Frames = 0;
 static GLint autoexit = 0;
+static GLint win = 0;
+static GLboolean Visible = GL_TRUE;
+static GLboolean Animate = GL_TRUE;
+static GLfloat viewDist = 40.0;
+
 
 /**
 
@@ -164,12 +167,24 @@ static GLfloat view_rotx = 20.0, view_roty = 30.0, view_rotz = 0.0;
 static GLint gear1, gear2, gear3;
 static GLfloat angle = 0.0;
 
+static void
+cleanup(void)
+{
+   glDeleteLists(gear1, 1);
+   glDeleteLists(gear2, 1);
+   glDeleteLists(gear3, 1);
+   glutDestroyWindow(win);
+}
+
 static void
 draw(void)
 {
   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
   glPushMatrix();
+
+    glTranslatef(0.0, 0.0, -viewDist);
+
     glRotatef(view_rotx, 1.0, 0.0, 0.0);
     glRotatef(view_roty, 0.0, 1.0, 0.0);
     glRotatef(view_rotz, 0.0, 0.0, 1.0);
@@ -199,16 +214,18 @@ draw(void)
   Frames++;
 
   {
-     GLint t = glutGet(GLUT_ELAPSED_TIME);
-     if (t - T0 >= 5000) {
-        GLfloat seconds = (t - T0) / 1000.0;
-        GLfloat fps = Frames / seconds;
-        printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
-        T0 = t;
-        Frames = 0;
-        if ((t >= 999.0 * autoexit) && (autoexit))
-           exit(0);
-     }
+    GLint t = glutGet(GLUT_ELAPSED_TIME);
+    if (t - T0 >= 5000) {
+      GLfloat seconds = (t - T0) / 1000.0;
+      GLfloat fps = Frames / seconds;
+      printf("%d frames in %6.3f seconds = %6.3f FPS\n", Frames, seconds, fps);
+      T0 = t;
+      Frames = 0;
+      if ((t >= 999.0 * autoexit) && (autoexit)) {
+        cleanup();
+        exit(0);
+      }
+    }
   }
 }
 
@@ -216,10 +233,28 @@ draw(void)
 static void
 idle(void)
 {
-  angle += 2.0;
+  static double t0 = -1.;
+  double dt, t = glutGet(GLUT_ELAPSED_TIME) / 1000.0;
+  if (t0 < 0.0)
+    t0 = t;
+  dt = t - t0;
+  t0 = t;
+
+  angle += 70.0 * dt;  /* 70 degrees per second */
+  angle = fmod(angle, 360.0); /* prevents eventual overflow */
+
   glutPostRedisplay();
 }
 
+static void
+update_idle_func(void)
+{
+  if (Visible && Animate)
+    glutIdleFunc(idle);
+  else
+    glutIdleFunc(NULL);
+}
+
 /* change view angle, exit upon ESC */
 /* ARGSUSED1 */
 static void
@@ -232,7 +267,18 @@ key(unsigned char k, int x, int y)
   case 'Z':
     view_rotz -= 5.0;
     break;
+  case 'd':
+     viewDist += 1.0;
+     break;
+  case 'D':
+     viewDist -= 1.0;
+     break;
+  case 'a':
+     Animate = !Animate;
+     update_idle_func();
+     break;
   case 27:  /* Escape */
+    cleanup();
     exit(0);
     break;
   default:
@@ -276,8 +322,6 @@ reshape(int width, int height)
   glLoadIdentity();
   glFrustum(-1.0, 1.0, -h, h, 5.0, 60.0);
   glMatrixMode(GL_MODELVIEW);
-  glLoadIdentity();
-  glTranslatef(0.0, 0.0, -40.0);
 }
 
 static void
@@ -330,13 +374,12 @@ init(int argc, char *argv[])
   }
 }
 
+
 static void 
 visible(int vis)
 {
-  if (vis == GLUT_VISIBLE)
-    glutIdleFunc(idle);
-  else
-    glutIdleFunc(NULL);
+   Visible = vis;
+   update_idle_func();
 }
 
 int main(int argc, char *argv[])
@@ -346,7 +389,7 @@ int main(int argc, char *argv[])
 
   glutInitWindowPosition(0, 0);
   glutInitWindowSize(300, 300);
-  glutCreateWindow("Gears");
+  win = glutCreateWindow("Gears");
   init(argc, argv);
 
   glutDisplayFunc(draw);
@@ -354,6 +397,7 @@ int main(int argc, char *argv[])
   glutKeyboardFunc(key);
   glutSpecialFunc(special);
   glutVisibilityFunc(visible);
+  update_idle_func();
 
   glutMainLoop();
   return 0;             /* ANSI C requires main to return int. */