OpenCL called correctly, but not yet giving result

Makefile

@@ -1,5 +1,5 @@
 CXX = g++
-CXXFLAGS = -fopenmp -Wall -O3
+CXXFLAGS = -fopenmp -Wall -O3 -g
 
 gol: main.o Timing.o
 	$(CXX) $(CXXFLAGS) -o gol main.o Timing.o -lOpenCL

gol.cl

@@ -1,5 +1,5 @@
 void kernel generation(global const int *previous, global int *new, global const int *size) {
-    int ID, Nthreads, n, ratio, start, stop;"
+    int ID, Nthreads, n, ratio, start, stop, x, y, left, right, up, down, neighbors, i;
 
     ID = get_global_id(0);
     Nthreads = get_global_size(0);
@@ -9,18 +9,18 @@ void kernel generation(global const int *previous, global int *new, global const
     start = ratio * ID;
     stop  = ratio * (ID + 1);
     
-    for (int i=start; i<stop; i++)
-        int x = i % size[1];
-        int y = i / size[0];
+    for (i = start; i < stop; i++)
+        x = i % size[1];
+        y = i / size[0];
 
-        int left = x - 1;
-        int right = (x + 1) % size[0];
+        left = x - 1;
+        right = (x + 1) % size[0];
 
-        int up = (y - 1 + size[1]) % size[1];
-        int down = (y + 1) % size[1];
+        up = (y - 1 + size[1]) % size[1];
+        down = (y + 1) % size[1];
 
         // Get the number of neighbors
-        int neighbors =
+        neighbors =
               previous[size[0] * up + left]
             + previous[size[0] * up + x]
             + previous[size[0] * up + right]

main.cpp

@@ -173,7 +173,7 @@ void print_usage() {
     std::cerr << "Usage: gol --mode seq|omp|ocl [--threads number] [--device cpu|gpu] --load infile.gol --save outfile.gol --generations number [--measure]" << std::endl;
 }
 
-void main_opencl(std::string infile, int num_generations) {
+void main_opencl(std::string infile, std::string outfile, int num_generations) {
     // get all platforms (drivers), e.g. NVIDIA
     std::vector<cl::Platform> all_platforms;
     cl::Platform::get(&all_platforms);
@@ -235,7 +235,7 @@ void main_opencl(std::string infile, int num_generations) {
     int size_x = std::stoi(x_str);
     int size_y = std::stoi(y_str);
 
-    int world[size_x * size_y];
+    bool *world = new bool[size_x * size_y];
 
     // Set the data
     for (int y = 0; y < size_y; y++) {
@@ -257,16 +257,16 @@ void main_opencl(std::string infile, int num_generations) {
     int n = size_x * size_y;
 
     // create buffers on device (allocate space on GPU)
-    cl::Buffer buffer_previous(context, CL_MEM_READ_WRITE, sizeof(int) * n);
-    cl::Buffer buffer_new(context, CL_MEM_READ_WRITE, sizeof(int) * n);
+    cl::Buffer buffer_previous(context, CL_MEM_READ_WRITE, sizeof(bool) * n);
+    cl::Buffer buffer_new(context, CL_MEM_READ_WRITE, sizeof(bool) * n);
     cl::Buffer buffer_size(context, CL_MEM_READ_WRITE, sizeof(int) * 2);
 
     // create a queue (a queue of commands that the GPU will execute)
     cl::CommandQueue queue(context, default_device);
 
     // push write commands to queue
-    queue.enqueueWriteBuffer(buffer_previous, CL_TRUE, 0, sizeof(int) * n, world);
-    queue.enqueueWriteBuffer(buffer_new, CL_TRUE, 0, sizeof(int) * n, world);  // TODO: pass empty array
+    queue.enqueueWriteBuffer(buffer_previous, CL_TRUE, 0, sizeof(bool) * n, world);
+    queue.enqueueWriteBuffer(buffer_new, CL_TRUE, 0, sizeof(bool) * n, world);  // TODO: pass empty array
     queue.enqueueWriteBuffer(buffer_size, CL_TRUE, 0, sizeof(int) * 2, size);  // TODO: pass empty array
 
     // RUN ZE KERNEL
@@ -278,7 +278,27 @@ void main_opencl(std::string infile, int num_generations) {
     queue.finish();
 
     // read result from GPU to here
-    queue.enqueueReadBuffer(buffer_new, CL_TRUE, 0, sizeof(int)*n, world);  // TODO: pass different empty?
+    queue.enqueueReadBuffer(buffer_new, CL_TRUE, 0, sizeof(bool) * n, world);  // TODO: pass different empty?
+
+    // Write the result
+    std::ofstream result_file;
+    result_file.open(outfile);
+
+    result_file << size_x << "," << size_y << '\n';
+    
+    for (int y = 0; y < size_y; y++) {
+        std::string line;
+        getline(world_file, line);
+
+        for (int x = 0; x < size_x; x++) {
+            // Convert 1 and 0 to 'x' and '.' again
+            line += world[y * size_x + x] ? 'x' : '.';
+        }
+
+        result_file << line << '\n';
+    }
+
+    result_file.close();
 }
 
 int main(int argc, char* argv[]) {
@@ -381,6 +401,11 @@ int main(int argc, char* argv[]) {
         std::cout << "Running OpenCL version" << std::endl;
     }
 
+    if (mode == Mode::OCL) {
+        main_opencl(infile, outfile, num_generations);
+        return 0;
+    }
+
     // Read in the start state
     std::ifstream world_file;
     world_file.open(infile);