moderngl_window_triangle_render_with_shader_program.py

1import moderngl
2import moderngl_window as mglw
3
4class HelloWorld(mglw.WindowConfig):
5    gl_version = (3, 3)
6    title = "ModernGL Quickstart"
7    window_size = (1280, 720)
8
9    def __init__(self, **kwargs):
10        super().__init__(**kwargs)
11        # Create a simple program
12        self.prog = self.ctx.program(
13            vertex_shader='''
14                #version 330
15                in vec2 in_vert;
16                void main() {
17                    gl_Position = vec4(in_vert, 0.0, 1.0);
18                }
19            ''',
20            fragment_shader='''
21                #version 330
22                out vec4 f_color;
23                void main() {
24                    f_color = vec4(0.3, 0.5, 1.0, 1.0);
25                }
26            ''',
27        )
28        
29        # Define a triangle
30        import numpy as np
31        vertices = np.array([
32            0.0, 0.8,
33            -0.6, -0.8,
34            0.6, -0.8,
35        ], dtype='f4')
36
37        self.vbo = self.ctx.buffer(vertices)
38        self.vao = self.ctx.simple_vertex_array(self.prog, self.vbo, 'in_vert')
39
40    def render(self, time, frame_time):
41        self.ctx.clear(0.1, 0.1, 0.1)
42        self.vao.render()
43
44if __name__ == '__main__':
45    mglw.run_window_config(HelloWorld)