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'''
Renders 2 triangles that share the same head using index buffers (ibo)
'''
import numpy as np
from _example import Example
class IndexBuffer(Example):
gl_version = (3, 3)
title = "Index Buffer"
def __init__(self, **kwargs):
super().__init__(**kwargs)
self.prog = self.ctx.program(
vertex_shader='''
#version 330
in vec2 in_vert;
void main() {
gl_Position = vec4(in_vert, 0.0, 1.0);
}
''',
fragment_shader='''
#version 330
out vec4 f_color;
void main() {
f_color = vec4(0.3, 0.5, 1.0, 1.0);
}
''',
)
# 2 triangles sharing the head vertex (0,0)
vertices = np.array([
0.0, 0.0,
-0.6, -0.8,
0.6, -0.8,
0.6, 0.8,
-0.6, 0.8,
], dtype='f4')
# Indices are given to specify the order of drawing
indices = np.array([0, 1, 2, 0, 3, 4], dtype='i4')
self.vbo = self.ctx.buffer(vertices)
self.ibo = self.ctx.buffer(indices)
vao_content = [
# 2 floats are assigned to the 'in' variable named 'in_vert' in the shader code
self.vbo.bind('in_vert', layout='2f'),
]
self.vao = self.ctx.vertex_array(self.prog, vao_content, self.ibo)
def render(self, time: float, frame_time: float):
self.ctx.clear(1.0, 1.0, 1.0)
self.vao.render()
if __name__ == '__main__':
IndexBuffer.run()
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