1 files changed, 62 insertions, 5 deletions

diff --git a/src/all.c b/src/all.c
index 4fe3d5b..130bf27 100644
--- a/src/all.c
+++ b/src/all.c
@@ -19,6 +19,7 @@ typedef struct {
 #define MEM_SIZE (1<<16)
 #define GRIDWIDTH 16
 #define GRIDHEIGHT 16
+#define TICK_LENGTH 1000
 
 typedef struct {
 	char *start;
@@ -45,6 +46,8 @@ typedef struct {
 } UI;
 
 typedef struct {
+	uint64_t lastTick;
+	char playing;
 	int grid[GRIDWIDTH * GRIDHEIGHT];
 } State;
 
@@ -52,6 +55,7 @@ typedef struct {
 enum {
 	INPUT_NONE,
 	INPUT_CLICK,
+	INPUT_PAUSE_PLAY,
 };
 
 typedef struct {
@@ -61,9 +65,19 @@ typedef struct {
 	int mousex, mousey;
 } Game;
 
-static const Color colors[] = {
+enum {
+	EMPTY,
+	BLACK,
+	RED,
+	YELLOW,
+	N_COLORS,
+};
+
+static const Color colors[N_COLORS] = {
 	{255, 255, 255, 255},
 	{0, 0, 0, 255},
+	{255, 0, 0, 255},
+	{255, 255, 0, 255}
 };
 
 static DrawList *render(State *state, UI *ui, Arena *a) {
@@ -90,7 +104,7 @@ static DrawList *render(State *state, UI *ui, Arena *a) {
 	return drawList;
 }
 
-static void update(Game *game, Arena a) {
+static void update(Game *game, uint64_t now, Arena a) {
 	switch (game->input) {
 		int x, y;
 		case INPUT_CLICK:
@@ -98,9 +112,41 @@ static void update(Game *game, Arena a) {
 			y = game->mousey * GRIDHEIGHT / game->ui.height;
 			game->state.grid[x + y * GRIDWIDTH] = (game->state.grid[x + y * GRIDWIDTH] + 1) % (sizeof(colors) / sizeof(colors[0]));
 			break;
+		case INPUT_PAUSE_PLAY:
+			game->state.playing = !game->state.playing;
+			break;
 		default:
 			break;
 	}
+
+	if (game->state.playing && game->state.lastTick + TICK_LENGTH <= now) {
+		game->state.lastTick = now;
+		State *lastState = new(&a, 1, State);
+		__builtin_memcpy(lastState, game, sizeof(State));
+
+		for (int x = 0; x < GRIDWIDTH; x++) {
+			for (int y = 0; y < GRIDHEIGHT; y++) {
+				if (
+					lastState->grid[x + y * GRIDWIDTH] == BLACK && (
+						(x > 0 && lastState->grid[x - 1 + y * GRIDWIDTH] == RED) ||
+						(x < GRIDWIDTH - 1 && lastState->grid[x + 1 + y * GRIDWIDTH] == RED) ||
+						(y > 0 && lastState->grid[x + (y - 1) * GRIDWIDTH] == RED) ||
+						(y < GRIDHEIGHT - 1 && lastState->grid[x + (y + 1) * GRIDWIDTH] == RED)
+					)
+				) {
+					game->state.grid[x + y * GRIDWIDTH] = RED;
+				}
+
+				if (lastState->grid[x + y * GRIDWIDTH] == RED) {
+					game->state.grid[x + y * GRIDWIDTH] = YELLOW;
+				}
+
+				if (lastState->grid[x + y * GRIDWIDTH] == YELLOW) {
+					game->state.grid[x + y * GRIDWIDTH] = BLACK;
+				}
+			}
+		}
+	}
 }
 
 #if SDL
@@ -118,7 +164,8 @@ int main(int argc, char **argv) {
 	};
 
 	Game *game = new(&a, 1, Game);
-	game->state.grid[0] = 1;
+	game->state.grid[0] = 0;
+	game->state.playing = 0;
 	game->ui = (UI) {
 		.width = 640,
 		.height = 480,
@@ -138,6 +185,7 @@ int main(int argc, char **argv) {
 	SDL_DestroyProperties(renderProps);
 	
 	for (;;) {
+		uint64_t now = SDL_GetTicks();
 		game->input = INPUT_NONE;
 		SDL_Event e = {0};
 		while (SDL_PollEvent(&e)) {
@@ -149,6 +197,13 @@ int main(int argc, char **argv) {
 					game->mousex = (int) e.button.x;
 					game->mousey = (int) e.button.y;
 					break;
+				case SDL_EVENT_KEY_DOWN:
+					switch (e.key.key) {
+						case SDLK_SPACE:
+							game->input = INPUT_PAUSE_PLAY;
+							break;
+					}
+					break;
 			}
 		}
 
@@ -183,7 +238,7 @@ int main(int argc, char **argv) {
 			SDL_RenderRect(r, &rect);
 		}
 
-		update(game, a);
+		update(game, now, a);
 
 		SDL_RenderPresent(r);
 	}
@@ -215,8 +270,10 @@ DrawList *game_render(int width, int height) {
 }
 
 __attribute((export_name("game_update")))
-void game_update(int input) {
+void game_update(int input, int mousex, int mousey) {
 	game->input = input;
+	game->mousex = mousex;
+	game->mousey = mousey;
 	update(game, perm);
 }