A high-performance general-purpose compute library

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graphics/conway_pretty.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
<< std::endl;
std::cout
<< "The conway_pretty example visualizes all the states in Conway"
<< std::endl
<< "Red : Cells that have died due to under population"
<< std::endl
<< "Yellow: Cells that continue to live from previous state"
<< std::endl
<< "Green : Cells that are new as a result of reproduction"
<< std::endl
<< "Blue : Cells that have died due to over population"
<< std::endl
<< std::endl;
std::cout
<< "This examples is throttled so as to be a better visualization"
<< std::endl;
af::Window simpleWindow(512, 512,
"Conway's Game Of Life - Current State");
af::Window prettyWindow(512, 512,
"Conway's Game Of Life - Visualizing States");
simpleWindow.setPos(32, 32);
prettyWindow.setPos(512 + 32, 32);
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) > 0.4).as(f32);
array display = tile(state, 1, 1, 3, 1);
while (!simpleWindow.close() && !prettyWindow.close()) {
af::timer delay = timer::start();
if (!simpleWindow.close()) simpleWindow.image(state);
if (!prettyWindow.close()) prettyWindow.image(display);
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);
array a0 = (state == 1) && (nHood < 2); // Die of under population
array a1 = (state != 0) && (C0 || C1); // Continue to live
array a2 = (state == 0) && C1; // Reproduction
array a3 = (state == 1) && (nHood > 3); // Over-population
display = join(2, a0 + a1, a1 + a2, a3).as(f32);
// Update state
state = state * C0 + C1;
double fps = 30;
while (timer::stop(delay) < (1 / fps)) {}
}
} 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::array::as
const array as(dtype type) const
Casts the array into another data type.
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::Window::setPos
void setPos(const unsigned x, const unsigned y)
Set the start position where the window will appear.
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
af::timer
Internal timer object.
Definition timing.h:29