static void glutDisplayCallback(void)
{
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glBegin(GL_LINES);
glVertex2f(cursor_x, cursor_y);
glVertex2f(window_width/2, window_height/2);
glEnd();
glutDrawString(16, 16, "Hello GLUT");
glutSwapBuffers();
}
void GLUTSimLightController::draw() {
int w = glutGet(GLUT_WINDOW_WIDTH);
int h = glutGet(GLUT_WINDOW_HEIGHT);
float light_position[4] = {0.0, 0.0, -1.0, 0.0};
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(35, (double) w/h, 0.1, 100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);
glTranslatef(0, 0, -3);
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1);
glEnable(GL_DEPTH_TEST);
glEnable(GL_POINT_SMOOTH);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_LIGHT0);
glEnable(GL_NORMALIZE);
struct Light {
float radius;
float color[3];
float position[2];
} lights[4] = {
{ .2, { 0, 0,.8 }, { -.5, -.5 } },
{ .2, { .8, 0, 0 }, { .5, -.5 } },
{ .2, { 0,.8, 0 }, { .5, .5 } },
{ .2, { .9,.9,.9 }, { -.5, .5 } },
};
for (unsigned i = 0; i != 4; ++i) {
Light &l = lights[i];
if (lights_enabled[i]) {
glColor3fv(l.color);
draw_circle_filled(l.position[0], l.position[1], l.radius);
}
}
// Draw the beat monitor.
const double beat_monitor_dim_time = .05;
double elapsed = get_elapsed_time_in_seconds();
if (elapsed - last_beat_time <= beat_monitor_dim_time) {
double v = 1 - (elapsed - last_beat_time) / beat_monitor_dim_time;
glColor3f(v, v, v);
glRectf(-.9, -.9, -.7, -.8);
}
// Draw the 2D overlays.
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, w, 0, h, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
const int textHeight = 15;
char buffer[256];
int y = 0;
sprintf(buffer, "Time: %.4fs\n", elapsed);
glColor3f(1, 1, 1);
glutDrawString(10, 10 + textHeight*y++, buffer);
if (true) {
num_frames++;
double fps = num_frames / elapsed;
sprintf(buffer, "FPS: %.4fs\n", fps);
glColor3f(1, 1, 1);
glutDrawString(10, 10 + textHeight*y++, buffer);
}
if (light_manager) {
double bpm = light_manager->GetRecentBPM();
sprintf(buffer, "BPM: %.4fs\n", bpm);
glColor3f(1, 1, 1);
glutDrawString(10, 10 + textHeight*y++, buffer);
}
if (light_manager) {
sprintf(buffer, "Program: %s\n", light_manager->GetProgramName().c_str());
glColor3f(1, 1, 1);
glutDrawString(10, 10 + textHeight*y++, buffer);
}
if (light_manager) {
sprintf(buffer, "Strobe Enabled: %s\n",
light_manager->GetStrobeEnabled() ? "yes" : "no");
glColor3f(1, 1, 1);
glutDrawString(10, 10 + textHeight*y++, buffer);
}
glFlush();
glutSwapBuffers();
}
