//renders one frame
void Render(void)
{
LIST * cur;
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
DrawStarfield(&g_starfield);
for(cur = g_asteroid_list; cur; cur = cur->next)
DrawAsteroid(cur->d);
if(g_ships)
DrawPlayer(&g_player);
else
{
RenderText(15.2858f, 27.0f, 50.0f, 1.0f, 0.75f, 0.0f, 0.0f, "GAME OVER");
if(!g_hisct_delay)
{
RenderText(13.1906f, 26.0f, 50.0f, 0.5f, 0.75f, 0.5f, 0.5f, "hit F2 to start a new game");
DrawHiScoreTable(&g_hisct);
}
}
for(cur = g_alien_list; cur; cur = cur->next)
DrawAlien(cur->d);
for(cur = g_shot_list; cur; cur = cur->next)
DrawShot(cur->d);
for(cur = g_explosion_list; cur; cur = cur->next)
DrawExplosion(cur->d);
for(cur = g_burst_list; cur; cur = cur->next)
DrawBurst(cur->d);
for(cur = g_powerup_list; cur; cur = cur->next)
DrawPowerup(cur->d);
if(g_paused)
{
RenderText(0.011792f, 6.0f, 50.0f, 6.36f, 1.0f, 0.5f, 0.5f, "paused");
RenderText(11.0954f, 4.0f, 50.0f, 1.0f, 1.0f, 0.5f, 0.5f, "(hit p to resume)");
}
RenderText(29.3f, 28.7f, 50.0f, 1.0f, 0.75f, 0.75f, 0.75f, "%10d", g_score);
RenderText(0.1f, 28.7f, 50.0f, 1.0f, 0.75f, 0.75f, 0.75f, "%d", (g_ships ? g_ships - 1 : 0));
if(g_level < 1000)
{
if(g_time_to_reset)
RenderText(7.9526f, 0.5f, 50.0f, 1.0f, 0.25f, 0.25f, 0.25f, "warping to level %03d...", g_level + 1);
else if(g_level)
RenderText(15.2858f, 0.5f, 50.0f, 1.0f, 0.25f, 0.25f, 0.25f, "level %03d", g_level);
}
else
RenderText(13.1906f, 0.5f, 50.0f, 1.0f, 1.0f, 1.0f, 1.0f, "you are a god");
if(g_ships && g_time_to_reset)
{
RenderText(15.2858f, 15.0f, 50.0f, 1.0f, 0.0f, 0.75f, 0.0f, "GOOD JOB!");
RenderText(14.5001f, 14.0f, 50.0f, 0.5f, 0.5f, 0.75f, 0.5f, "completion bonus: %3d", (g_level > 99 ? 999 : g_level * 10));
}
RenderText(0.1f, 0.2f, 0.0f, 0.5f, 0.5f, 0.0f, 0.5f, "%.1ffps", g_fps);
glFlush();
glutSwapBuffers();
}
//Main program loop - Run gets called until it returns false
bool Run() {
//Main loop - get keypresses and interpret them
keystate=GetRemoteKeys();
if(keystate & KEY_HOME) {
return false;
}
switch(mode) {
case 0: { //Splash screen
if (keystate & KEY_INPUT2) { //Button B
//Start game
InitialiseGame();
PlaySound(SOUND_BEEP);
}
if (keystate & KEY_INPUT1) { //Button A
//show help
ShowHelp();
PlaySound(SOUND_BEEP);
}
}
break;
case 2: { //Help - wait for 'OK' press
if (keystate & KEY_INPUT2) { //Button B
//Reset back to splash screen
ResetTimer();
mode=0;
Splash();
PlaySound(SOUND_BEEP);
}
}
break;
case 1: { //Game
if (keystate & KEY_INPUT1) { //Button A
//Reset back to splash screen
ResetTimer();
mode=0;
Splash();
}
if (keystate & KEY_RUN) { //Go button
//Fire!
PlaySound(SOUND_SHOOT);
refreshCount = 0;
int hit;
hit = LineHitsObject(cameraPos, cameraAngle);
if (hit == tankObjectIndex) {
//we hit the tank!
score += 100;
CloseGraphics();
OpenGraphics();
DrawWorld(&world, cameraPos, cameraAngle);
DrawHUD();
DrawExplosion();
DrawArrow(cameraAngle.y);
DrawRadarDots(true);
DrawRadarArm(sweepAngle * sweepStepCount++);
DrawRadarDots(false);
SetTextColor(CYAN);
DrawText(6,100,"Quit");
Show();
PlaySound(SOUND_EXPLOSION);
PlaceTank(cameraPos, cameraAngle);
}
}
//Have the movement sticks changed? This bit doesn't care about buttons
if((keystate & (KEY_RIGHT_BACK+KEY_RIGHT_FORWARD+KEY_LEFT_BACK+KEY_LEFT_FORWARD)) != (oldKeystate & (KEY_RIGHT_BACK+KEY_RIGHT_FORWARD+KEY_LEFT_BACK+KEY_LEFT_FORWARD))) {
MoveCamera(&cameraPos, &cameraAngle, baselinePos, arrowRefAngle, ReadTimer(), oldKeystate);
arrowRefAngle=cameraAngle.y;
baselinePos=cameraPos;
ResetTimer();
oldKeystate = keystate;
if (keystate==0) //we've just stopped moving
refreshCount=0;
}
if (mode==1) {
if (sweepStepCount == SWEEPSTEPS)
sweepStepCount=0;
if (--behaviourCount<0)
ChooseBehaviour();
MoveTank();
MoveCamera(&cameraPos, &cameraAngle, baselinePos, arrowRefAngle, ReadTimer(), oldKeystate);
//is it time to reset the tank model? Otherwise it gradually gets distorted
if (--resetCount<0) {
//Refresh the tank model which is prone to getting distorted
//due to cumulative inaccuracies of sin/cos approximations
Point3d angle=world.objects[tankObjectIndex].heading;
Point3d tankPos=world.objects[tankObjectIndex].centre;
world.objects[tankObjectIndex]=tank;
MoveObject(&(world.objects[tankObjectIndex]), tankPos);
RotateObjectYAxis(&(world.objects[tankObjectIndex]), angle.y);
resetCount=50;
}
//Is it time to redraw the world?
if (--refreshCount<0) {
//Seems a bit brutal to have to close graphics but it's
//the only way to clear the screen that'll let us draw
//on it properly again - ClearScreen or ClearRectangle mess up
CloseGraphics();
OpenGraphics();
DrawWorld(&world, cameraPos, cameraAngle);
DrawHUD();
refreshCount=2;
}
DrawArrow(cameraAngle.y);
DrawRadarDots(true);
DrawRadarArm(sweepAngle * sweepStepCount++);
DrawRadarDots(false);
SetTextColor(CYAN);
DrawText(6,100,"Quit");
Show();
//just in case we changed mode...
if (mode==0)
Splash();
}
}
}
Sleep(50);
return true;
}
