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import os
import numpy as np
from pyrr import Matrix44
import moderngl
from _example import Example
def terrain(size):
vertices = np.dstack(np.mgrid[0:size, 0:size][::-1]) / size
temp = np.dstack([np.arange(0, size * size - size), np.arange(size, size * size)])
index = np.pad(temp.reshape(size - 1, 2 * size), [[0, 0], [0, 1]], 'constant', constant_values=-1)
return vertices, index
class WireframeTerrain(Example):
title = "Wireframe Terrain"
gl_version = (3, 3)
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
uniform mat4 Mvp;
uniform sampler2D Heightmap;
in vec2 in_vert;
in vec3 in_color;
out vec3 v_color;
void main() {
v_color = in_color;
float height = texture(Heightmap, in_vert.xy).r * 0.5;
gl_Position = Mvp * vec4(in_vert.xy - 0.5, height, 1.0);
}
''',
fragment_shader='''
#version 330
in vec3 v_color;
out vec4 f_color;
void main() {
f_color = vec4(v_color, 1.0);
}
''',
)
self.mvp = self.prog['Mvp']
vertices, index = terrain(32)
self.vbo = self.ctx.buffer(vertices.astype('f4'))
self.ibo = self.ctx.buffer(index.astype('i4'))
vao_content = [
(self.vbo, '2f', 'in_vert'),
]
self.vao = self.ctx.vertex_array(self.prog, vao_content, self.ibo)
self.texture = self.load_texture_2d('noise.jpg')
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)
self.ctx.wireframe = True
proj = Matrix44.perspective_projection(45.0, self.aspect_ratio, 0.1, 1000.0)
lookat = Matrix44.look_at(
(np.cos(angle), np.sin(angle), 0.8),
(0.0, 0.0, 0.1),
(0.0, 0.0, 1.0),
)
self.texture.use()
self.mvp.write((proj * lookat).astype('f4'))
self.vao.render(moderngl.TRIANGLE_STRIP)
if __name__ == '__main__':
WireframeTerrain.run()
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