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"""
Renders 100 x 100 cubes using instancing.
We are using the moderngl-window specific VAO wrapper.
Each cube is animated in the vertex shader offset by gl_InstanceID
"""
from pathlib import Path
import numpy
from pyrr import Matrix44
import moderngl
import moderngl_window
from moderngl_window import geometry
from base import CameraWindow
class CubeSimpleInstanced(CameraWindow):
"""Renders cubes using instancing"""
title = "Plain Cube"
resource_dir = (Path(__file__).parent / 'resources').resolve()
aspect_ratio = None
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.wnd.mouse_exclusivity = True
self.camera.projection.update(near=1, far=1000)
self.cube = geometry.cube(size=(2, 2, 2))
self.prog = self.load_program('programs/cube_simple_instanced.glsl')
self.prog['m_model'].write(Matrix44.identity(dtype='f4'))
# Generate per instance data represeting a grid of cubes
N = 100
self.instances = N * N
def gen_data(x_res, z_res, spacing=2.5):
"""Generates a grid of N * N poistions and random colors on the xz plane"""
for y in range(z_res):
for x in range(x_res):
yield -N * spacing / 2 + spacing * x
yield 0
yield -N * spacing / 2 + spacing * y
yield numpy.random.uniform(0, 1)
yield numpy.random.uniform(0, 1)
yield numpy.random.uniform(0, 1)
self.instance_data = self.ctx.buffer(numpy.fromiter(gen_data(N, N), 'f4', count=self.instances * 6))
self.cube.buffer(self.instance_data, '3f 3f/i', ['in_offset', 'in_color'])
def render(self, time: float, frametime: float):
self.ctx.enable_only(moderngl.CULL_FACE | moderngl.DEPTH_TEST)
self.prog['m_proj'].write(self.camera.projection.matrix)
self.prog['m_camera'].write(self.camera.matrix)
self.prog['time'].value = time
self.cube.render(self.prog, instances=self.instances)
if __name__ == '__main__':
moderngl_window.run_window_config(CubeSimpleInstanced)
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