/* game_loop() has been turned into a SDL based loop.
The code for one iteration of the original game_loop is
in game_loop_iter. */
static void
game_loop()
{
/* FPS */
int fps = 0;
int fps_ema = 0;
int fps_target = 25;
const float ema_alpha = 0.003;
int drag_button = 0;
unsigned int last_down[3] = {0};
unsigned int last_click[3] = {0};
unsigned int current_ticks = SDL_GetTicks();
unsigned int accum = 0;
unsigned int accum_frames = 0;
SDL_Event event;
gui_event_t ev;
game_loop_run = 1;
while (game_loop_run) {
if (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_MOUSEBUTTONUP:
if (drag_button == event.button.button) {
ev.type = GUI_EVENT_TYPE_DRAG_END;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = drag_button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
drag_button = 0;
}
ev.type = GUI_EVENT_TYPE_BUTTON_UP;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
if (event.button.button <= 3 &&
current_ticks - last_down[event.button.button-1] < MOUSE_SENSITIVITY) {
ev.type = GUI_EVENT_TYPE_CLICK;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
if (current_ticks - last_click[event.button.button-1] < MOUSE_SENSITIVITY) {
ev.type = GUI_EVENT_TYPE_DBL_CLICK;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
}
last_click[event.button.button-1] = current_ticks;
}
break;
case SDL_MOUSEBUTTONDOWN:
ev.type = GUI_EVENT_TYPE_BUTTON_DOWN;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
if (event.button.button <= 3) last_down[event.button.button-1] = current_ticks;
break;
case SDL_MOUSEMOTION:
if (drag_button == 0) {
/* Move pointer normally. */
interface_set_cursor(&interface, event.motion.x, event.motion.y);
}
for (int button = 1; button <= 3; button++) {
if (event.motion.state & SDL_BUTTON(button)) {
if (drag_button == 0) {
drag_button = button;
ev.type = GUI_EVENT_TYPE_DRAG_START;
ev.x = event.motion.x;
ev.y = event.motion.y;
ev.button = drag_button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
}
ev.type = GUI_EVENT_TYPE_DRAG_MOVE;
ev.x = event.motion.x;
ev.y = event.motion.y;
ev.button = drag_button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
break;
}
}
break;
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_q &&
(event.key.keysym.mod & KMOD_CTRL)) {
game_loop_quit();
break;
}
switch (event.key.keysym.sym) {
/* Map scroll */
case SDLK_UP: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, 0, -1);
}
break;
case SDLK_DOWN: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, 0, 1);
}
break;
case SDLK_LEFT: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, -1, 0);
}
break;
case SDLK_RIGHT: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, 1, 0);
}
break;
/* Panel click shortcuts */
case SDLK_1: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 0);
}
break;
case SDLK_2: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 1);
}
break;
case SDLK_3: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 2);
}
break;
case SDLK_4: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 3);
}
break;
case SDLK_5: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 4);
}
break;
/* Game speed */
case SDLK_PLUS:
case SDLK_KP_PLUS:
if (game.game_speed < 40) game.game_speed += 1;
LOGI("main", "Game speed: %u", game.game_speed);
break;
case SDLK_MINUS:
case SDLK_KP_MINUS:
if (game.game_speed >= 1) game.game_speed -= 1;
LOGI("main", "Game speed: %u", game.game_speed);
break;
case SDLK_0:
game.game_speed = DEFAULT_GAME_SPEED;
LOGI("main", "Game speed: %u", game.game_speed);
break;
case SDLK_p:
if (game.game_speed == 0) game_pause(0);
else game_pause(1);
break;
/* Audio */
case SDLK_s:
sfx_enable(!sfx_is_enabled());
break;
case SDLK_m:
midi_enable(!midi_is_enabled());
break;
/* Misc */
case SDLK_ESCAPE:
if (BIT_TEST(interface.click, 7)) { /* Building road */
interface_build_road_end(&interface);
} else if (interface.clkmap != 0) {
interface_close_popup(&interface);
}
break;
/* Debug */
case SDLK_g:
interface.viewport.layers ^= VIEWPORT_LAYER_GRID;
break;
case SDLK_j: {
int current = 0;
for (int i = 0; i < 4; i++) {
if (interface.player == game.player[i]) {
current = i;
break;
}
}
for (int i = (current+1) % 4; i != current; i = (i+1) % 4) {
if (PLAYER_IS_ACTIVE(game.player[i])) {
interface.player = game.player[i];
LOGD("main", "Switched to player %i.", i);
break;
}
}
}
break;
case SDLK_z:
if (event.key.keysym.mod & KMOD_CTRL) {
save_game(0);
}
break;
default:
break;
}
break;
case SDL_QUIT:
game_loop_quit();
break;
}
}
unsigned int new_ticks = SDL_GetTicks();
int delta_ticks = new_ticks - current_ticks;
current_ticks = new_ticks;
accum += delta_ticks;
while (accum >= TICK_LENGTH) {
game_update();
/* Autosave periodically */
if ((game.const_tick % AUTOSAVE_INTERVAL) == 0 &&
game.game_speed > 0) {
int r = save_game(1);
if (r < 0) LOGW("main", "Autosave failed.");
}
/* FPS */
fps = 1000*((float)accum_frames / accum);
if (fps_ema > 0) fps_ema = ema_alpha*fps + (1-ema_alpha)*fps_ema;
else if (fps > 0) fps_ema = fps;
if ((game.const_tick % (10*TICKS_PER_SEC)) == 0) {
LOGV("main", "FPS: %i", fps_ema);
}
accum -= TICK_LENGTH;
accum_frames = 0;
}
/* Update and draw interface */
interface_update(&interface);
interface.flags &= ~BIT(4);
interface.flags &= ~BIT(7);
gui_object_redraw((gui_object_t *)&interface, game.frame);
/* TODO very crude dirty marking algortihm: mark everything. */
sdl_mark_dirty(0, 0, sdl_frame_get_width(game.frame),
sdl_frame_get_height(game.frame));
/* Swap video buffers */
sdl_swap_buffers();
accum_frames += 1;
/* Reduce framerate to target */
if (fps_target > 0) {
int delay = 0;
if (fps_ema > 0) delay = (1000/fps_target) - (1000/fps_ema);
if (delay > 0) SDL_Delay(delay);
}
}
}
/* game_loop() has been turned into a SDL based loop.
The code for one iteration of the original game_loop is
in game_loop_iter. */
static void
game_loop()
{
/* FPS */
int fps = 0;
float fps_ema = 0;
int fps_target = 25;
/* TODO: compute alpha dynamically based on frametime */
const float ema_alpha = 0.07;
const int frametime_target = 1000 / fps_target; /* in milliseconds */
int last_frame = SDL_GetTicks();
int drag_button = 0;
unsigned int last_down[3] = {0};
unsigned int last_click[3] = {0};
unsigned int current_ticks = SDL_GetTicks();
unsigned int accum = 0;
SDL_Event event;
gui_event_t ev;
game_loop_run = 1;
while (game_loop_run) {
while (SDL_PollEvent(&event)) {
switch (event.type) {
case SDL_MOUSEBUTTONUP:
if (drag_button == event.button.button) {
ev.type = GUI_EVENT_TYPE_DRAG_END;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = drag_button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
drag_button = 0;
}
ev.type = GUI_EVENT_TYPE_BUTTON_UP;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
if (event.button.button <= 3 &&
current_ticks - last_down[event.button.button-1] < MOUSE_SENSITIVITY) {
ev.type = GUI_EVENT_TYPE_CLICK;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
if (current_ticks - last_click[event.button.button-1] < MOUSE_SENSITIVITY) {
ev.type = GUI_EVENT_TYPE_DBL_CLICK;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
}
last_click[event.button.button-1] = current_ticks;
}
break;
case SDL_MOUSEBUTTONDOWN:
ev.type = GUI_EVENT_TYPE_BUTTON_DOWN;
ev.x = event.button.x;
ev.y = event.button.y;
ev.button = event.button.button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
if (event.button.button <= 3) last_down[event.button.button-1] = current_ticks;
break;
case SDL_MOUSEMOTION:
if (drag_button == 0) {
/* Move pointer normally. */
interface_set_cursor(&interface, event.motion.x, event.motion.y);
}
for (int button = 1; button <= 3; button++) {
if (event.motion.state & SDL_BUTTON(button)) {
if (drag_button == 0) {
drag_button = button;
ev.type = GUI_EVENT_TYPE_DRAG_START;
ev.x = event.motion.x;
ev.y = event.motion.y;
ev.button = drag_button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
}
ev.type = GUI_EVENT_TYPE_DRAG_MOVE;
ev.x = event.motion.x;
ev.y = event.motion.y;
ev.button = drag_button;
gui_object_handle_event((gui_object_t *)&interface, &ev);
break;
}
}
break;
case SDL_KEYDOWN:
if (event.key.keysym.sym == SDLK_q &&
(event.key.keysym.mod & KMOD_CTRL)) {
game_loop_quit();
break;
}
switch (event.key.keysym.sym) {
/* Map scroll */
case SDLK_UP: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, 0, -1);
}
break;
case SDLK_DOWN: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, 0, 1);
}
break;
case SDLK_LEFT: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, -1, 0);
}
break;
case SDLK_RIGHT: {
viewport_t *viewport = interface_get_top_viewport(&interface);
viewport_move_by_pixels(viewport, 1, 0);
}
break;
/* Panel click shortcuts */
case SDLK_1: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 0);
}
break;
case SDLK_2: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 1);
}
break;
case SDLK_3: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 2);
}
break;
case SDLK_4: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 3);
}
break;
case SDLK_5: {
panel_bar_t *panel = interface_get_panel_bar(&interface);
panel_bar_activate_button(panel, 4);
}
break;
case SDLK_TAB:
if (event.key.keysym.mod & KMOD_SHIFT) {
interface_return_from_message(&interface);
} else {
interface_open_message(&interface);
}
break;
/* Game speed */
case SDLK_PLUS:
case SDLK_KP_PLUS:
if (game.game_speed < 40) game.game_speed += 1;
LOGI("main", "Game speed: %u", game.game_speed);
break;
case SDLK_MINUS:
case SDLK_KP_MINUS:
if (game.game_speed >= 1) game.game_speed -= 1;
LOGI("main", "Game speed: %u", game.game_speed);
break;
case SDLK_0:
game.game_speed = DEFAULT_GAME_SPEED;
LOGI("main", "Game speed: %u", game.game_speed);
break;
case SDLK_p:
if (game.game_speed == 0) game_pause(0);
else game_pause(1);
break;
/* Audio */
case SDLK_s:
sfx_enable(!sfx_is_enabled());
break;
case SDLK_m:
midi_enable(!midi_is_enabled());
break;
/* Video */
case SDLK_f:
if (event.key.keysym.mod & KMOD_CTRL) {
sdl_set_fullscreen(!sdl_is_fullscreen());
}
break;
/* Misc */
case SDLK_ESCAPE:
if (GUI_OBJECT(&interface.popup)->displayed) {
interface_close_popup(&interface);
} else if (interface.building_road) {
interface_build_road_end(&interface);
}
break;
/* Debug */
case SDLK_g:
interface.viewport.layers ^= VIEWPORT_LAYER_GRID;
break;
case SDLK_b:
interface.viewport.show_possible_build = !interface.viewport.show_possible_build;
break;
case SDLK_j: {
int current = 0;
for (int i = 0; i < 4; i++) {
if (interface.player == game.player[i]) {
current = i;
break;
}
}
for (int i = (current+1) % 4; i != current; i = (i+1) % 4) {
if (PLAYER_IS_ACTIVE(game.player[i])) {
interface.player = game.player[i];
LOGD("main", "Switched to player %i.", i);
break;
}
}
}
break;
case SDLK_z:
if (event.key.keysym.mod & KMOD_CTRL) {
save_game(0);
}
break;
case SDLK_F10:
interface_open_game_init(&interface);
break;
default:
break;
}
break;
case SDL_VIDEORESIZE:
sdl_set_resolution(event.resize.w, event.resize.h, 0);
frame_t *screen = sdl_get_screen_frame();
int width = sdl_frame_get_width(screen);
int height = sdl_frame_get_height(screen);
screen_frame.clip.w = width;
screen_frame.clip.h = height;
gui_object_set_size((gui_object_t *)&interface, width, height);
break;
case SDL_QUIT:
game_loop_quit();
break;
}
}
unsigned int new_ticks = SDL_GetTicks();
int delta_ticks = new_ticks - current_ticks;
current_ticks = new_ticks;
/* Update FPS EMA per frame */
fps = 1000*(1.0 / (float)delta_ticks);
if (fps_ema > 0) fps_ema = ema_alpha*fps + (1-ema_alpha)*fps_ema;
else if (fps > 0) fps_ema = fps;
accum += delta_ticks;
while (accum >= TICK_LENGTH) {
game_update();
/* Autosave periodically */
if ((game.const_tick % AUTOSAVE_INTERVAL) == 0 &&
game.game_speed > 0) {
int r = save_game(1);
if (r < 0) LOGW("main", "Autosave failed.");
}
/* Print FPS */
if ((game.const_tick % (10*TICKS_PER_SEC)) == 0) {
LOGV("main", "FPS: %i", (int)fps_ema);
}
accum -= TICK_LENGTH;
}
/* Update and draw interface */
interface_update(&interface);
gui_object_redraw(GUI_OBJECT(&interface), game.frame);
/* TODO very crude dirty marking algortihm: mark everything. */
sdl_mark_dirty(0, 0, sdl_frame_get_width(game.frame),
sdl_frame_get_height(game.frame));
/* Swap video buffers */
sdl_swap_buffers();
/* Reduce framerate to target if we finished too fast */
int now = SDL_GetTicks();
int frametime_spent = now - last_frame;
if (frametime_spent < frametime_target) {
SDL_Delay(frametime_target - frametime_spent);
}
last_frame = SDL_GetTicks();
}
}