01. Hello World!ΒΆ

01_hello_world

Hello World

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import struct

import GLWindow
import ModernGL

# Window & Context

wnd = GLWindow.create_window()
ctx = ModernGL.create_context()

# Shaders & Program

prog = ctx.program([
    ctx.vertex_shader('''
        #version 330

        in vec2 vert;

        void main() {
            gl_Position = vec4(vert, 0.0, 1.0);
        }
    '''),
    ctx.fragment_shader('''
        #version 330

        out vec4 color;

        void main() {
            color = vec4(0.3, 0.5, 1.0, 1.0);
        }
    '''),
])

# Buffer

vbo = ctx.buffer(struct.pack(
    '6f',
    0.0, 0.8,
    -0.6, -0.8,
    0.6, -0.8,
))

# Put everything together

vao = ctx.simple_vertex_array(prog, vbo, ['vert'])

# Main loop

while wnd.update():
    ctx.viewport = wnd.viewport
    ctx.clear(0.9, 0.9, 0.9)
    vao.render()