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# -*- coding: utf-8 -*-
# vispy: gallery 200
# -----------------------------------------------------------------------------
# Copyright (c) Vispy Development Team. All Rights Reserved.
# Distributed under the (new) BSD License. See LICENSE.txt for more info.
# -----------------------------------------------------------------------------
# Author: Nicolas P .Rougier
# Date: 06/03/2014
# Abstract: GPU computing using the framebuffer
# Keywords: framebuffer, GPU computing, cellular automata
# -----------------------------------------------------------------------------
"""
Conway game of life.
"""
import numpy as np
from vispy.gloo import (Program, FrameBuffer, RenderBuffer,
clear, set_viewport, set_state)
from vispy import app
render_vertex = """
attribute vec2 position;
attribute vec2 texcoord;
varying vec2 v_texcoord;
void main()
{
gl_Position = vec4(position, 0.0, 1.0);
v_texcoord = texcoord;
}
"""
render_fragment = """
uniform int pingpong;
uniform sampler2D texture;
varying vec2 v_texcoord;
void main()
{
float v;
v = texture2D(texture, v_texcoord)[pingpong];
gl_FragColor = vec4(1.0-v, 1.0-v, 1.0-v, 1.0);
}
"""
compute_vertex = """
attribute vec2 position;
attribute vec2 texcoord;
varying vec2 v_texcoord;
void main()
{
gl_Position = vec4(position, 0.0, 1.0);
v_texcoord = texcoord;
}
"""
compute_fragment = """
uniform int pingpong;
uniform sampler2D texture;
uniform float dx; // horizontal distance between texels
uniform float dy; // vertical distance between texels
varying vec2 v_texcoord;
void main(void)
{
vec2 p = v_texcoord;
float old_state, new_state, count;
old_state = texture2D(texture, p)[pingpong];
count = texture2D(texture, p + vec2(-dx,-dy))[pingpong]
+ texture2D(texture, p + vec2( dx,-dy))[pingpong]
+ texture2D(texture, p + vec2(-dx, dy))[pingpong]
+ texture2D(texture, p + vec2( dx, dy))[pingpong]
+ texture2D(texture, p + vec2(-dx, 0.0))[pingpong]
+ texture2D(texture, p + vec2( dx, 0.0))[pingpong]
+ texture2D(texture, p + vec2(0.0,-dy))[pingpong]
+ texture2D(texture, p + vec2(0.0, dy))[pingpong];
new_state = old_state;
if( old_state > 0.5 ) {
// Any live cell with fewer than two live neighbours dies
// as if caused by under-population.
if( count < 1.5 )
new_state = 0.0;
// Any live cell with two or three live neighbours
// lives on to the next generation.
// Any live cell with more than three live neighbours dies,
// as if by overcrowding.
else if( count > 3.5 )
new_state = 0.0;
} else {
// Any dead cell with exactly three live neighbours becomes
// a live cell, as if by reproduction.
if( (count > 2.5) && (count < 3.5) )
new_state = 1.0;
}
if( pingpong == 0) {
gl_FragColor[1] = new_state;
gl_FragColor[0] = old_state;
} else {
gl_FragColor[1] = old_state;
gl_FragColor[0] = new_state;
}
}
"""
class Canvas(app.Canvas):
def __init__(self):
app.Canvas.__init__(self, title="Conway game of life",
size=(512, 512), keys='interactive')
# Build programs
# --------------
self.comp_size = self.size
size = self.comp_size + (4,)
Z = np.zeros(size, dtype=np.float32)
Z[...] = np.random.randint(0, 2, size)
Z[:256, :256, :] = 0
gun = """
........................O...........
......................O.O...........
............OO......OO............OO
...........O...O....OO............OO
OO........O.....O...OO..............
OO........O...O.OO....O.O...........
..........O.....O.......O...........
...........O...O....................
............OO......................"""
x, y = 0, 0
for i in range(len(gun)):
if gun[i] == '\n':
y += 1
x = 0
elif gun[i] == 'O':
Z[y, x] = 1
x += 1
self.pingpong = 1
self.compute = Program(compute_vertex, compute_fragment, 4)
self.compute["texture"] = Z
self.compute["position"] = [(-1, -1), (-1, +1), (+1, -1), (+1, +1)]
self.compute["texcoord"] = [(0, 0), (0, 1), (1, 0), (1, 1)]
self.compute['dx'] = 1.0 / size[1]
self.compute['dy'] = 1.0 / size[0]
self.compute['pingpong'] = self.pingpong
self.render = Program(render_vertex, render_fragment, 4)
self.render["position"] = [(-1, -1), (-1, +1), (+1, -1), (+1, +1)]
self.render["texcoord"] = [(0, 0), (0, 1), (1, 0), (1, 1)]
self.render["texture"] = self.compute["texture"]
self.render['pingpong'] = self.pingpong
self.fbo = FrameBuffer(self.compute["texture"],
RenderBuffer(self.comp_size))
set_state(depth_test=False, clear_color='black')
self._timer = app.Timer('auto', connect=self.update, start=True)
self.show()
def on_draw(self, event):
with self.fbo:
set_viewport(0, 0, *self.comp_size)
self.compute["texture"].interpolation = 'nearest'
self.compute.draw('triangle_strip')
clear()
set_viewport(0, 0, *self.physical_size)
self.render["texture"].interpolation = 'linear'
self.render.draw('triangle_strip')
self.pingpong = 1 - self.pingpong
self.compute["pingpong"] = self.pingpong
self.render["pingpong"] = self.pingpong
if __name__ == '__main__':
canvas = Canvas()
app.run()
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