static void RunFixedFrame()
{
_uncapTick = 0;
uint32 currentTick = SDL_GetTicks();
uint32 ticksElapsed = currentTick - _lastTick;
if (ticksElapsed < UPDATE_TIME_MS)
{
SDL_Delay(UPDATE_TIME_MS - ticksElapsed);
_lastTick += UPDATE_TIME_MS;
}
else
{
_lastTick = currentTick;
}
platform_process_messages();
rct2_update();
if (!_isWindowMinimised)
{
platform_draw();
}
}
static void RunVariableFrame()
{
uint32 currentTick = SDL_GetTicks();
if (_uncapTick == 0)
{
_uncapTick = currentTick;
sprite_position_tween_reset();
}
// Limit number of updates per loop (any long pauses or debugging can make this update for a very long time)
if (currentTick - _uncapTick > UPDATE_TIME_MS * 60)
{
_uncapTick = currentTick - UPDATE_TIME_MS - 1;
}
platform_process_messages();
while (_uncapTick <= currentTick && currentTick - _uncapTick > UPDATE_TIME_MS)
{
// Get the original position of each sprite
sprite_position_tween_store_a();
// Update the game so the sprite positions update
rct2_update();
// Get the next position of each sprite
sprite_position_tween_store_b();
_uncapTick += UPDATE_TIME_MS;
}
// Tween the position of each sprite from the last position to the new position based on the time between the last
// tick and the next tick.
float nudge = 1 - ((float)(currentTick - _uncapTick) / UPDATE_TIME_MS);
sprite_position_tween_all(nudge);
platform_draw();
sprite_position_tween_restore();
}
/**
* Run the main game loop until the finished flag is set at 40fps (25ms interval).
*/
static void openrct2_loop()
{
uint32 currentTick, ticksElapsed, lastTick = 0;
static uint32 uncapTick = 0;
static int fps = 0;
static uint32 secondTick = 0;
log_verbose("begin openrct2 loop");
_finished = 0;
do {
if (gConfigGeneral.uncap_fps && gGameSpeed <= 4) {
currentTick = SDL_GetTicks();
if (uncapTick == 0) {
// Reset sprite locations
uncapTick = SDL_GetTicks();
openrct2_reset_object_tween_locations();
}
// Limit number of updates per loop (any long pauses or debugging can make this update for a very long time)
if (currentTick - uncapTick > 25 * 60) {
uncapTick = currentTick - 25 - 1;
}
platform_process_messages();
while (uncapTick <= currentTick && currentTick - uncapTick > 25) {
// Get the original position of each sprite
for (uint16 i = 0; i < MAX_SPRITES; i++) {
_spritelocations1[i].x = g_sprite_list[i].unknown.x;
_spritelocations1[i].y = g_sprite_list[i].unknown.y;
_spritelocations1[i].z = g_sprite_list[i].unknown.z;
}
// Update the game so the sprite positions update
rct2_update();
// Get the next position of each sprite
for (uint16 i = 0; i < MAX_SPRITES; i++) {
_spritelocations2[i].x = g_sprite_list[i].unknown.x;
_spritelocations2[i].y = g_sprite_list[i].unknown.y;
_spritelocations2[i].z = g_sprite_list[i].unknown.z;
}
uncapTick += 25;
}
// Tween the position of each sprite from the last position to the new position based on the time between the last
// tick and the next tick.
float nudge = 1 - ((float)(currentTick - uncapTick) / 25);
for (uint16 i = 0; i < MAX_SPRITES; i++) {
if (!sprite_should_tween(&g_sprite_list[i]))
continue;
sprite_move(
_spritelocations2[i].x + (sint16)((_spritelocations1[i].x - _spritelocations2[i].x) * nudge),
_spritelocations2[i].y + (sint16)((_spritelocations1[i].y - _spritelocations2[i].y) * nudge),
_spritelocations2[i].z + (sint16)((_spritelocations1[i].z - _spritelocations2[i].z) * nudge),
&g_sprite_list[i]
);
invalidate_sprite_2(&g_sprite_list[i]);
}
if ((SDL_GetWindowFlags(gWindow) & (SDL_WINDOW_MINIMIZED | SDL_WINDOW_HIDDEN)) == 0) {
rct2_draw();
platform_draw();
}
fps++;
if (SDL_GetTicks() - secondTick >= 1000) {
fps = 0;
secondTick = SDL_GetTicks();
}
// Restore the real positions of the sprites so they aren't left at the mid-tween positions
for (uint16 i = 0; i < MAX_SPRITES; i++) {
if (!sprite_should_tween(&g_sprite_list[i]))
continue;
invalidate_sprite_2(&g_sprite_list[i]);
sprite_move(_spritelocations2[i].x, _spritelocations2[i].y, _spritelocations2[i].z, &g_sprite_list[i]);
}
network_update();
} else {
uncapTick = 0;
currentTick = SDL_GetTicks();
ticksElapsed = currentTick - lastTick;
if (ticksElapsed < 25) {
if (ticksElapsed < 15)
SDL_Delay(15 - ticksElapsed);
continue;
}
lastTick = currentTick;
platform_process_messages();
rct2_update();
if ((SDL_GetWindowFlags(gWindow) & (SDL_WINDOW_MINIMIZED | SDL_WINDOW_HIDDEN)) == 0) {
rct2_draw();
platform_draw();
}
}
} while (!_finished);
}