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from __future__ import division
from random import randint
from math import cos
from sfml import sf
class Effect(sf.Drawable):
def __init__(self, name):
sf.Drawable.__init__(self)
self._name = name
self.is_loaded = False
def _get_name(self):
return self._name
def load(self):
self.is_loaded = sf.Shader.is_available() and self.on_load()
def update(self, time, x, y):
if self.is_loaded:
self.on_update(time, x, y)
def draw(self, target, states):
if self.is_loaded:
self.on_draw(target, states)
else:
error = sf.Text("Shader not\nsupported")
error.font = sf.Font.from_file("data/sansation.ttf")
error.position = (320, 200)
error.character_size = 36
target.draw(error, states)
name = property(_get_name)
class Pixelate(Effect):
def __init__(self):
Effect.__init__(self, 'pixelate')
def on_load(self):
try:
# load the texture and initialize the sprite
self.texture = sf.Texture.from_file("data/background.jpg")
self.sprite = sf.Sprite(self.texture)
# load the shader
self.shader = sf.Shader.from_file(fragment="data/pixelate.frag")
self.shader.set_parameter("texture")
except IOError as error:
print("An error occured: {0}".format(error))
exit(1)
return True
def on_update(self, time, x, y):
self.shader.set_parameter("pixel_threshold", (x + y) / 30)
def on_draw(self, target, states):
states.shader = self.shader
target.draw(self.sprite, states)
class WaveBlur(Effect):
def __init__(self):
Effect.__init__(self, 'wave + blur')
def on_load(self):
with open("data/text.txt") as file:
self.text = sf.Text(file.read())
self.text.font = sf.Font.from_file("data/sansation.ttf")
self.text.character_size = 22
self.text.position = (30, 20)
try:
# load the shader
self.shader = sf.Shader.from_file("data/wave.vert", "data/blur.frag")
except IOError as error:
print("An error occured: {0}".format(error))
exit(1)
return True
def on_update(self, time, x, y):
self.shader.set_parameter("wave_phase", time)
self.shader.set_parameter("wave_amplitude", x * 40, y * 40)
self.shader.set_parameter("blur_radius", (x + y) * 0.008)
def on_draw(self, target, states):
states.shader = self.shader
target.draw(self.text, states)
class StormBlink(Effect):
def __init__(self):
Effect.__init__(self, 'storm + blink')
self.points = sf.VertexArray()
def on_load(self):
# create the points
self.points.primitive_type = sf.PrimitiveType.POINTS
for i in range(40000):
x = randint(0, 32767) % 800
y = randint(0, 32767) % 600
r = randint(0, 32767) % 255
g = randint(0, 32767) % 255
b = randint(0, 32767) % 255
self.points.append(sf.Vertex(sf.Vector2(x, y), sf.Color(r, g, b)))
try:
# load the shader
self.shader = sf.Shader.from_file("data/storm.vert", "data/blink.frag")
except IOError as error:
print("An error occured: {0}".format(error))
exit(1)
return True
def on_update(self, time, x, y):
radius = 200 + cos(time) * 150
self.shader.set_parameter("storm_position", x * 800, y * 600)
self.shader.set_parameter("storm_inner_radius", radius / 3)
self.shader.set_parameter("storm_total_radius", radius)
self.shader.set_parameter("blink_alpha", 0.5 + cos(time*3) * 0.25)
def on_draw(self, target, states):
states.shader = self.shader
target.draw(self.points, states)
class Edge(Effect):
def __init__(self):
Effect.__init__(self, "edge post-effect")
def on_load(self):
# create the off-screen surface
self.surface = sf.RenderTexture(800, 600)
self.surface.smooth = True
# load the textures
self.background_texture = sf.Texture.from_file("data/sfml.png")
self.background_texture.smooth = True
self.entity_texture = sf.Texture.from_file("data/devices.png")
self.entity_texture.smooth = True
# initialize the background sprite
self.background_sprite = sf.Sprite(self.background_texture)
self.background_sprite.position = (135, 100)
# load the moving entities
self.entities = []
for i in range(6):
sprite = sf.Sprite(self.entity_texture, (96 * i, 0, 96, 96))
self.entities.append(sprite)
# load the shader
self.shader = sf.Shader.from_file(fragment="data/edge.frag")
self.shader.set_parameter("texture")
return True
def on_update(self, time, x, y):
self.shader.set_parameter("edge_threshold", 1 - (x + y) / 2)
# update the position of the moving entities
for i, entity in enumerate(self.entities):
x = cos(0.25 * (time * i + (len(self.entities) - i))) * 300 + 350
y = cos(0.25 * (time * (len(self.entities) - i) + i)) * 200 + 250
entity.position = (x, y)
# render the updated scene to the off-screen surface
self.surface.clear(sf.Color.WHITE)
self.surface.draw(self.background_sprite)
for entity in self.entities:
self.surface.draw(entity)
self.surface.display()
def on_draw(self, target, states):
states.shader = self.shader
target.draw(sf.Sprite(self.surface.texture), states)
if __name__ == "__main__":
# create the main window
window = sf.RenderWindow(sf.VideoMode(800, 600), "pySFML - Shader")
window.vertical_synchronization = True
# create the effects
effects = (Pixelate(), WaveBlur(), StormBlink(), Edge())
current = 0
# initialize them
for effect in effects: effect.load()
# create the message background
try:
text_background_texture = sf.Texture.from_file("data/text-background.png")
except IOError as error:
print("An error occured: {0}".format(error))
exit(1)
text_background = sf.Sprite(text_background_texture)
text_background.position = (0, 520)
text_background.color = sf.Color(255, 255, 255, 200)
# load the messages font
try:
font = sf.Font.from_file("data/sansation.ttf")
except IOError as error:
print("An error occured: {0}".format(error))
exit(1)
# create the description text
description = sf.Text("Current effect: {0}".format(effects[current].name), font, 20)
description.position = (10, 530)
description.color = sf.Color(80, 80, 80)
# create the instructions text
instructions = sf.Text("Press left and right arrows to change the current shader", font, 20)
instructions.position = (280, 555)
instructions.color = sf.Color(80, 80, 80)
clock = sf.Clock()
# start the game loop
while window.is_open:
# update the current example
x, y = sf.Mouse.get_position(window) / window.size
effects[current].update(clock.elapsed_time.seconds, x, y)
# process events
for event in window.events:
# close window: exit
if type(event) is sf.CloseEvent:
window.close()
if type(event) is sf.KeyEvent and event.pressed:
# escapte key: exit
if event.code == sf.Keyboard.ESCAPE:
window.close()
# left arrow key: previous shader
elif event.code is sf.Keyboard.LEFT:
if current == 0: current = len(effects) - 1
else: current -= 1
description.string = "Current effect: {0}".format(effects[current].name)
# right arrow key: next shader
elif event.code is sf.Keyboard.RIGHT:
if current == len(effects) - 1: current = 0
else: current += 1
description.string = "Current effect: {0}".format(effects[current].name)
# clear the window
window.clear(sf.Color(255, 128, 0))
# draw the current example
window.draw(effects[current])
# draw the text
window.draw(text_background)
window.draw(instructions)
window.draw(description)
# finally, display the rendered frame on screen
window.display()
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