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"""
Based on BlubberQuark's blog:
https://blubberquark.tumblr.com/post/185013752945/using-moderngl-for-post-processing-shaders-with
Clears the screen using opengl with a constantly changing
color value and alpha blend a pygame surface on top.
"""
import math
from pathlib import Path
import pygame
import moderngl
import moderngl_window
from moderngl_window import geometry
class Pygame(moderngl_window.WindowConfig):
"""
Example using pygame with moderngl.
Needs to run with ``--window pygame2`` option.
"""
title = "Pygame"
window_size = 1280, 720
resource_dir = (Path(__file__) / '../../resources').absolute()
def __init__(self, **kwargs):
super().__init__(**kwargs)
# Create a 24bit (rgba) offscreen surface pygame can render to
self.pg_screen = pygame.Surface(self.window_size, flags=pygame.SRCALPHA)
# 24 bit (rgba) moderngl texture
self.pg_texture = self.ctx.texture(self.window_size, 4)
self.pg_texture.filter = moderngl.NEAREST, moderngl.NEAREST
self.pg_texture.swizzle = "BGRA"
self.texture_program = self.load_program('programs/texture.glsl')
self.quad_texture = self.load_texture_2d('textures/python-bg.png')
self.quad_fs = geometry.quad_fs()
def render(self, time, frametime):
self.ctx.clear()
self.ctx.enable(moderngl.BLEND)
# Render background graphics
self.quad_texture.use()
self.texture_program['texture0'].value = 0
self.quad_fs.render(self.texture_program)
# Render foreground objects
self.pg_texture.use()
self.render_pygame(time)
self.quad_fs.render(self.texture_program)
self.ctx.disable(moderngl.BLEND)
def render_pygame(self, time):
"""Render to offscreen surface and copy result into moderngl texture"""
self.pg_screen.fill((0, 0, 0, 0)) # Make sure we clear with alpha 0!
N = 8
for i in range(N):
time_offset = 6.28 / N * i
pygame.draw.circle(
self.pg_screen,
((i * 50) % 255, (i * 100) % 255, (i * 20) % 255),
(
math.sin(time + time_offset) * 200 + self.window_size[0] // 2,
math.cos(time + time_offset) * 200 + self.window_size[1] // 2),
math.sin(time) * 7 + 15,
)
# Get the buffer view of the Surface's pixels
# and write this data into the texture
texture_data = self.pg_screen.get_view('1')
self.pg_texture.write(texture_data)
if __name__ == '__main__':
moderngl_window.run_window_config(Pygame, args=('--window', 'pygame2'))
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