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|
import struct
from colorsys import hls_to_rgb as hls
from random import uniform
import numpy as np
from pyrr import Matrix44
import moderngl
from _example import Example
def random_color():
return hls(uniform(0.0, 1.0), 0.5, 0.5)
cars = []
cars += [{'color': random_color(),
'pos': (1.5, i * 2.0 - 9.0, 0.0),
'angle': uniform(-0.5, 0.5)} for i in range(10)]
cars += [{'color': random_color(),
'pos': (-1.5, i * 2.0 - 9.0, 0.0),
'angle': uniform(-0.5, 0.5)} for i in range(10)]
class ToyCars(Example):
title = "Toy Cars With Vector Shadow"
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_position;
in vec3 in_normal;
in vec3 in_color;
in vec3 in_origin;
in mat3 in_basis;
out vec3 v_vert;
out vec3 v_norm;
out vec3 v_color;
void main() {
v_vert = in_origin + in_basis * in_position;
v_norm = in_basis * in_normal;
v_color = in_color;
gl_Position = Mvp * vec4(v_vert, 1.0);
}
''',
fragment_shader='''
#version 330
uniform vec3 Light;
uniform sampler2D Texture;
in vec3 v_vert;
in vec3 v_norm;
in vec3 v_color;
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(v_color * lum, 1.0);
}
''',
)
self.mvp = self.prog['Mvp']
self.light = self.prog['Light']
obj = self.load_scene('lowpoly_toy_car.obj')
self.vbo = self.ctx.buffer(struct.pack(
'15f',
1.0, 1.0, 1.0,
0.0, 0.0, 0.0,
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
) * len(cars))
vao_wrapper = obj.root_nodes[0].mesh.vao
vao_wrapper.buffer(self.vbo, '3f 3f 9f/i', ['in_color', 'in_origin', 'in_basis'])
self.vao = vao_wrapper.instance(self.prog)
def render(self, time, frame_time):
angle = time
self.ctx.clear(1.0, 1.0, 1.0)
self.ctx.enable(moderngl.DEPTH_TEST)
camera_pos = (np.cos(angle) * 20.0, np.sin(angle) * 20.0, 5.0)
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
self.vbo.write(b''.join(struct.pack(
'15f',
*car['color'],
*car['pos'],
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0,
) for car in cars))
self.vao.render(instances=len(cars))
self.vbo.write(b''.join(struct.pack(
'15f',
0.0, 0.0, 0.0,
*car['pos'],
1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.3, 0.6, 0.0,
) for car in cars))
self.vao.render(instances=len(cars))
if __name__ == '__main__':
ToyCars.run()
|
