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#include <stdlib.h>
#include <time.h>
#include "SDL2/SDL.h"
#define HEIGHT 80
#define WIDTH 130
#define SPF 1000 / 30
void wrap(int *a, int w) {
if (*a < 0) *a = w - 1;
else if (*a > w - 1) *a = 0;
}
int place(int x, int y) {
wrap(&x, WIDTH);
wrap(&y, HEIGHT);
return x + y * WIDTH;
}
int neighbors(char *cells, int x, int y) {
int count = 0;
for (int i = -1; i <= 1; i++)
for (int j = -1; j <= 1; j++) {
if (i == 0 && j == 0) continue;
if (cells[place(i + x, j + y)] & 2) count++;
}
return count;
}
int resize(SDL_Renderer *r) {
int w, h;
SDL_GetRendererOutputSize(r, &w, &h);
return w / WIDTH < h / HEIGHT ? w / WIDTH : h / HEIGHT;
}
char inside(int n, char *v) {
char result = 0;
if (n >= 0 && n <= 8)
for (int i = 0; i < strlen(v); i++) {
result |= (n == v[i] - 48);
}
return result;
}
void init(char *cells, char random) {
for (int x = 0; x < WIDTH; x++) {
for (int y = 0; y < HEIGHT; y++) {
if (random) cells[place(x, y)] ^= 3 * (rand() % 2);
else cells[place(x, y)] = 0;
}
}
}
int main(int argc, char **argv) {
if (argc != 3) exit(1);
srand(time(0));
SDL_Init(SDL_INIT_VIDEO);
SDL_Window *w = SDL_CreateWindow(argv[0], 0, 0, 800, 600, SDL_WINDOW_RESIZABLE);
SDL_Renderer *r = SDL_CreateRenderer(w, -1, SDL_RENDERER_ACCELERATED);
int cellsize = resize(r);
int oldtime = 0;
int newtime = 0;
char paused = 0;
char grid = 1;
int symtime = 0;
int rendertime = 0;
char cells[WIDTH * HEIGHT];
init(cells, 1);
SDL_Event e = {0};
int exit = 0;
while (!exit) {
SDL_Delay(SPF);
while (SDL_PollEvent(&e)) {
if (e.window.event == SDL_WINDOWEVENT_RESIZED)
cellsize = resize(r);
if (e.key.state == SDL_PRESSED) {
if (e.key.keysym.sym == SDLK_BACKSPACE)
init(cells, 0);
if (e.key.keysym.sym == SDLK_RETURN)
init(cells, 1);
if (e.key.keysym.sym == SDLK_SPACE)
paused ^= 1;
if (e.key.keysym.sym == SDLK_PERIOD) {
paused = 1;
symtime = SPF + 1;
}
if (e.key.keysym.sym == SDLK_g) {
grid ^= 1;
}
if (e.key.keysym.sym == SDLK_q) {
exit = 1;
}
}
int mx, my;
int mstate = SDL_GetMouseState(&mx, &my);
if (mstate & SDL_BUTTON(SDL_BUTTON_RIGHT)) {
cells[place(mx / cellsize, my / cellsize)] = 0;
paused = 1;
} else if (mstate & SDL_BUTTON(SDL_BUTTON_LEFT)) {
cells[place(mx / cellsize, my / cellsize)] = 3;
paused = 1;
}
};
oldtime = newtime;
newtime = SDL_GetTicks();
if (!paused) symtime += newtime - oldtime;
if (symtime > SPF) {
symtime = 0;
for (int x = 0; x < WIDTH; x++)
for (int y = 0; y < HEIGHT; y++) {
int n = neighbors(cells, x, y);
if (inside(n, argv[1]) && ~cells[place(x, y)] & 2)
cells[place(x, y)] |= 1; // Birth
if (!inside(n, argv[2]) && cells[place(x, y)] & 2)
cells[place(x, y)] &= 2; // Death
}
for (int i = 0; i < WIDTH * HEIGHT; i++)
cells[i] = cells[i] & 1 ? 3 : 0;
}
rendertime += newtime - oldtime;
if (rendertime > SPF) {
rendertime = 0;
SDL_SetRenderDrawColor(r, 160, 160, 160, 255);
SDL_RenderClear(r);
for (int x = 0; x < WIDTH; x++)
for (int y = 0; y < HEIGHT; y++) {
SDL_Rect rect = { x * cellsize, y * cellsize, cellsize, cellsize };
if (grid && cellsize > 1) {
rect.x += 1;
rect.y += 1;
rect.w -= 1;
rect.h -= 1;
}
if (cells[place(x, y)]) SDL_SetRenderDrawColor(r, 0, 0, 0, 255);
else SDL_SetRenderDrawColor(r, 255, 255, 255, 255);
SDL_RenderFillRect(r, &rect);
}
SDL_RenderPresent(r);
}
}
SDL_DestroyRenderer(r);
SDL_DestroyWindow(w);
SDL_Quit();
return 0;
}
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