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import numpy as np
from pyrr import Matrix44
import moderngl
from _example import Example
class InstancedCrates(Example):
'''
This example renders 32x32 crates.
For each crate the location is [x, y, sin(a * time + b)]
There are 1024 crates aligned in a grid.
'''
title = "Instanced Crates"
gl_version = (3, 3)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
uniform mat4 Mvp;
in vec3 in_move;
in vec3 in_position;
in vec3 in_normal;
in vec2 in_texcoord_0;
out vec3 v_vert;
out vec3 v_norm;
out vec2 v_text;
void main() {
gl_Position = Mvp * vec4(in_position + in_move, 1.0);
v_vert = in_position + in_move;
v_norm = in_normal;
v_text = in_texcoord_0;
}
''',
fragment_shader='''
#version 330
uniform vec3 Light;
uniform sampler2D Texture;
in vec3 v_vert;
in vec3 v_norm;
in vec2 v_text;
out vec4 f_color;
void main() {
float lum = clamp(dot(normalize(Light - v_vert), normalize(v_norm)), 0.0, 1.0) * 0.8 + 0.2;
f_color = vec4(texture(Texture, v_text).rgb * lum, 1.0);
}
''',
)
self.mvp = self.prog['Mvp']
self.light = self.prog['Light']
self.scene = self.load_scene('crate.obj')
self.texture = self.load_texture_2d('crate.png')
# Add a new buffer into the VAO wrapper in the scene.
# This is simply a collection of named buffers that is auto mapped
# to attributes in the vertex shader with the same name.
self.instance_data = self.ctx.buffer(reserve=12 * 1024)
vao_wrapper = self.scene.root_nodes[0].mesh.vao
vao_wrapper.buffer(self.instance_data, '3f/i', 'in_move')
# Create the actual vao instance (auto mapping in action)
self.vao = vao_wrapper.instance(self.prog)
self.crate_a = np.random.uniform(0.7, 0.8, 32 * 32)
self.crate_b = np.random.uniform(0.0, 6.3, 32 * 32)
self.crate_x = (np.tile(np.arange(32), 32) - 16) * 1.5
self.crate_y = (np.repeat(np.arange(32), 32) - 16) * 1.5
self.crate_x += np.random.uniform(-0.2, 0.2, 32 * 32)
self.crate_y += np.random.uniform(-0.2, 0.2, 32 * 32)
def render(self, time, frame_time):
angle = time * 0.2
self.ctx.clear(1.0, 1.0, 1.0)
self.ctx.enable(moderngl.DEPTH_TEST)
camera_pos = (np.cos(angle) * 5.0, np.sin(angle) * 5.0, 2.0)
proj = Matrix44.perspective_projection(45.0, self.aspect_ratio, 0.1, 1000.0)
lookat = Matrix44.look_at(
camera_pos,
(0.0, 0.0, 0.5),
(0.0, 0.0, 1.0),
)
self.mvp.write((proj * lookat).astype('f4'))
self.light.value = camera_pos
crate_z = np.sin(self.crate_a * time + self.crate_b) * 0.2
coordinates = np.dstack([self.crate_x, self.crate_y, crate_z])
self.instance_data.write(coordinates.astype('f4'))
self.texture.use()
self.vao.render(instances=1024)
if __name__ == '__main__':
InstancedCrates.run()
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