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'''
Renders a blue triangle
'''
import numpy as np
from _example import Example
class HelloWorld(Example):
gl_version = (3, 3)
title = "Hello World"
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
out vec3 v_color;
in vec2 in_position;
vec2 positions[3] = vec2[](
vec2(0.0, 0.08),
vec2(-0.06, -0.08),
vec2(0.06, -0.08)
);
vec3 colors[3] = vec3[](
vec3(1.0, 0.0, 0.0),
vec3(0.0, 1.0, 0.0),
vec3(0.0, 0.0, 1.0)
);
void main() {
gl_Position = vec4(in_position + positions[gl_VertexID], 0.0, 1.0);
v_color = colors[gl_VertexID];
}
''',
fragment_shader='''
#version 330
in vec3 v_color;
layout (location = 0) out vec4 out_color;
void main() {
out_color = vec4(v_color, 1.0);
}
''',
)
positions = np.random.uniform(-1.0, 1.0, (100, 2)).astype('f4')
self.vbo = self.ctx.buffer(positions)
self.vao = self.ctx.vertex_array(self.prog, [
(self.vbo, '2f/i', 'in_position'),
])
self.vao.vertices = 3
def render(self, time, frame_time):
self.ctx.clear(1.0, 1.0, 1.0)
self.vao.render(instances=100)
if __name__ == '__main__':
HelloWorld.run()
|
