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'''
Alpha blending
'''
import numpy as np
import moderngl
from _example import Example
class AlphaBlending(Example):
gl_version = (3, 3)
title = "Alpha Blending"
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
in vec2 vert;
in vec4 vert_color;
out vec4 frag_color;
uniform vec2 scale;
uniform float rotation;
void main() {
frag_color = vert_color;
float r = rotation * (0.5 + gl_InstanceID * 0.05);
mat2 rot = mat2(cos(r), sin(r), -sin(r), cos(r));
gl_Position = vec4((rot * vert) * scale, 0.0, 1.0);
}
''',
fragment_shader='''
#version 330
in vec4 frag_color;
out vec4 color;
void main() {
color = vec4(frag_color);
}
''',
)
self.scale = self.prog['scale']
self.rotation = self.prog['rotation']
self.scale.value = (0.5, self.aspect_ratio * 0.5)
vertices = np.array([
1.0, 0.0,
1.0, 0.0, 0.0, 0.5,
-0.5, 0.86,
0.0, 1.0, 0.0, 0.5,
-0.5, -0.86,
0.0, 0.0, 1.0, 0.5,
], dtype='f4')
self.vbo = self.ctx.buffer(vertices)
self.vao = self.ctx.vertex_array(self.prog, [
self.vbo.bind('vert', 'vert_color'),
])
def render(self, time: float, frame_time: float):
self.ctx.clear(1.0, 1.0, 1.0)
self.ctx.enable(moderngl.BLEND)
self.rotation.value = time
self.vao.render(instances=10)
if __name__ == '__main__':
AlphaBlending.run()
|
