A high-performance general-purpose compute library

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graphics/conway.cpp
/*******************************************************
* Copyright (c) 2014, ArrayFire
* All rights reserved.
*
* This file is distributed under 3-clause BSD license.
* The complete license agreement can be obtained at:
* http://arrayfire.com/licenses/BSD-3-Clause
********************************************************/
#include <arrayfire.h>
#include <cstdio>
#include <iostream>
using namespace af;
int main(int, char**) {
try {
static const float h_kernel[] = {1, 1, 1, 1, 0, 1, 1, 1, 1};
static const int reset = 500;
static const int game_w = 128, game_h = 128;
af::info();
std::cout << "This example demonstrates the Conway's Game of Life "
"using ArrayFire"
<< std::endl
<< "There are 4 simple rules of Conways's Game of Life"
<< std::endl
<< "1. Any live cell with fewer than two live neighbours "
"dies, as if caused by under-population."
<< std::endl
<< "2. Any live cell with two or three live neighbours lives "
"on to the next generation."
<< std::endl
<< "3. Any live cell with more than three live neighbours "
"dies, as if by overcrowding."
<< std::endl
<< "4. Any dead cell with exactly three live neighbours "
"becomes a live cell, as if by reproduction."
<< std::endl
<< "Each white block in the visualization represents 1 alive "
"cell, black space represents dead cells"
<< std::endl;
af::Window myWindow(512, 512, "Conway's Game of Life using ArrayFire");
int frame_count = 0;
// Initialize the kernel array just once
const af::array kernel(3, 3, h_kernel, afHost);
array state;
state = (af::randu(game_h, game_w, f32) > 0.5).as(f32);
while (!myWindow.close()) {
myWindow.image(state);
frame_count++;
// Generate a random starting state
if (frame_count % reset == 0)
state = (af::randu(game_h, game_w, f32) > 0.5).as(f32);
// Convolve gets neighbors
af::array nHood = convolve(state, kernel);
// Generate conditions for life
// state == 1 && nHood < 2 ->> state = 0
// state == 1 && nHood > 3 ->> state = 0
// else if state == 1 ->> state = 1
// state == 0 && nHood == 3 ->> state = 1
af::array C0 = (nHood == 2);
af::array C1 = (nHood == 3);
// Update state
state = state * C0 + C1;
}
} catch (af::exception& e) {
fprintf(stderr, "%s\n", e.what());
throw;
}
return 0;
}
arrayfire.h
af::Window
Window object to render af::arrays.
Definition graphics.h:37
af::array
A multi dimensional data container.
Definition array.h:37
af::exception
An ArrayFire exception class.
Definition exception.h:22
af::exception::what
virtual const char * what() const
Returns an error message for the exception in a string format.
Definition exception.h:46
f32
@ f32
32-bit floating point values
Definition defines.h:211
afHost
@ afHost
Host pointer.
Definition defines.h:234
af::info
AFAPI void info()
af::Window::image
void image(const array &in, const char *title=NULL)
Renders the input array as an image to the window.
af::Window::close
bool close()
Check if window is marked for close.
af::randu
AFAPI array randu(const dim4 &dims, const dtype ty, randomEngine &r)
C++ Interface to create an array of random numbers uniformly distributed.
af
Definition algorithm.h:15