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import struct
import moderngl
import numpy as np
from pyrr import Matrix44
from _example import Example
class CrateExample(Example):
title = "Crate"
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.uniform_buffer = self.ctx.buffer(reserve=256)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
layout (std140) uniform Common {
mat4 Mvp;
vec3 Light;
};
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, 1.0);
v_vert = in_position;
v_norm = in_normal;
v_text = in_texcoord_0;
}
''',
fragment_shader='''
#version 330
layout (std140) uniform Common {
mat4 Mvp;
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.prog['Common'].binding = 2
self.uniform_buffer.bind_to_uniform_block(2)
self.scene = self.load_scene('crate.obj')
self.vao = self.scene.root_nodes[0].mesh.vao.instance(self.prog)
self.texture = self.load_texture_2d('crate.png')
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) * 3.0, np.sin(angle) * 3.0, 2.0)
proj = Matrix44.perspective_projection(45.0, self.aspect_ratio, 0.1, 100.0)
lookat = Matrix44.look_at(
camera_pos,
(0.0, 0.0, 0.5),
(0.0, 0.0, 1.0),
)
mvp = (proj * lookat).astype('f4').tobytes()
self.uniform_buffer.write(struct.pack('=64s3f4x', mvp, *camera_pos))
self.texture.use()
self.vao.render()
if __name__ == '__main__':
CrateExample.run()
|
