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way-of-life/src/js/wasm/engine.c
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#include <stdlib.h> | |
#include <stdio.h> | |
#include <emscripten.h> | |
#include <string.h> | |
int width = 0; | |
int height = 0; | |
char *current; | |
char *next; | |
EMSCRIPTEN_KEEPALIVE | |
char *init(int w, int h) { | |
width = w + 2; | |
height = h + 2; | |
current = malloc(width * height * sizeof(char)); | |
next = malloc(width * height * sizeof(char)); | |
return current; | |
} | |
int cell_index(int i, int j) { | |
return i * width + j; | |
} | |
EMSCRIPTEN_KEEPALIVE | |
char cell(int i, int j) { | |
return current[cell_index(i, j)]; | |
} | |
EMSCRIPTEN_KEEPALIVE | |
char cellSafe(int cellIndex) { | |
return current[cellIndex]; | |
} | |
EMSCRIPTEN_KEEPALIVE | |
char getNext(int i, int j) { | |
return next[cell_index(i, j)]; | |
} | |
void loopCurrentState() { | |
for (int j=1; j < width + 1; j++) { | |
current[cell_index(0, j)] = current[cell_index(height - 2, j)]; | |
current[cell_index(height - 1, j)] = current[cell_index(1, j)]; | |
} | |
for (int i=1; i < height + 1; i++) { | |
current[cell_index(i, 0)] = current[cell_index(i, width - 2)]; | |
current[cell_index(i, width - 1)] = current[cell_index(i, 1)]; | |
} | |
current[cell_index(0, 0)] = current[cell_index(height - 2, width - 2)]; | |
current[cell_index(0, width - 1)] = current[cell_index(height - 2, 1)]; | |
current[cell_index(height - 1, 0)] = current[cell_index(1, width - 2)]; | |
current[cell_index(height - 1, width - 1)] = current[cell_index(1, 1)]; | |
} | |
EMSCRIPTEN_KEEPALIVE | |
void computeNextState () { | |
loopCurrentState(); | |
int neighbors = 0; | |
int i_m1, i_p1, i_; | |
int j_m1, j_p1; | |
int height_limit = height - 1; | |
int width_limit = width - 1; | |
for (int i = 1; i < height_limit; i++) { | |
i_m1 = (i - 1) * width; | |
i_p1 = (i + 1) * width; | |
i_ = i * width; | |
for (int j = 1; j < width_limit; j++) { | |
j_m1 = j - 1; | |
j_p1 = j + 1; | |
neighbors = current[i_m1 + j_m1]; | |
neighbors += current[i_m1 + j]; | |
neighbors += current[i_m1 + j_p1]; | |
neighbors += current[i_+ j_m1]; | |
neighbors += current[i_ + j_p1]; | |
neighbors += current[i_p1 + j_m1]; | |
neighbors += current[i_p1 + j]; | |
neighbors += current[i_p1 + j_p1]; | |
if (neighbors == 3) { | |
next[i_ + j] = 1; | |
} else if (neighbors == 2) { | |
next[i_ + j] = current[i_ + j]; | |
} else { | |
next[i_ + j] = 0; | |
} | |
} | |
} | |
memcpy(current, next, width * height); | |
} | |
EMSCRIPTEN_KEEPALIVE | |
void set (int i, int j, int value) { | |
current[cell_index(i, j)] = value; | |
} | |
EMSCRIPTEN_KEEPALIVE | |
void setNext (int i,int j, int value) { | |
next[cell_index(i, j)] = value; | |
} | |
EMSCRIPTEN_KEEPALIVE | |
int main() { | |
EM_ASM( | |
console.log("ok, run"); | |
); | |
return 0; | |
} |