static void light();
static void ground();
static void backdrop();
+static void xlogo();
static void display();
static void idle();
static float cam_theta = 45, cam_phi, cam_dist = 10;
static unsigned int sdr_curve_top, sdr_beam, sdr_sky;
-static unsigned int start_time;
-static float beam_rot_speed = 0.1;
+static long start_time;
+static float anim_speed = 1.0;
+static long anim_stop_time;
+static long tmsec;
static const float sil_color[] = {0.05, 0.02, 0.1, 1.0};
static const float beam_color[] = {0.5, 0.4, 0.2, 1.0};
glScalef(1, 1, 0.45);
glutSolidCylinder(1, 1, 4, 16);
glPopMatrix();
-
+
bind_program(0);
}
static void display()
{
- unsigned int tmsec = glutGet(GLUT_ELAPSED_TIME) - start_time;
+ if(anim_stop_time > 0) {
+ tmsec = anim_stop_time - start_time;
+ } else {
+ tmsec = (long)glutGet(GLUT_ELAPSED_TIME) - start_time;
+ }
+
float tsec = (float)tmsec / 1000.0;
+ float tanim = tsec * anim_speed;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
backdrop();
glPushMatrix();
- float beam_angle = tsec * beam_rot_speed * 360;
-
+ float beam_angle = tanim * 0.1 * 360;
glRotatef(beam_angle, 0, 1, 0);
light();
gluPerspective(50, (float)x / (float)y, 0.5, 500);
}
+static long calc_timeshift(float prev_speed, float speed)
+{
+ long delta = tmsec * speed - tmsec * prev_speed;
+ return delta / speed;
+}
+
+#define ANIM_DELTA 0.5
+
static void keyboard(unsigned char c, int x, int y)
{
+ float prev_anim_speed;
+
switch(c) {
case 27:
exit(0);
+
+ case ' ':
+ if(anim_stop_time > 0) {
+ start_time += glutGet(GLUT_ELAPSED_TIME) - anim_stop_time;
+ anim_stop_time = 0;
+ } else {
+ anim_stop_time = glutGet(GLUT_ELAPSED_TIME);
+ }
+ break;
+
+ case '=':
+ start_time += calc_timeshift(anim_speed, anim_speed + ANIM_DELTA);
+ anim_speed += ANIM_DELTA;
+ break;
+
+ case '-':
+ prev_anim_speed = anim_speed;
+ anim_speed -= ANIM_DELTA;
+ if(anim_speed < 0)
+ anim_speed = 0;
+ start_time += calc_timeshift(prev_anim_speed, anim_speed);
+ break;
default:
break;
}