import struct

import ModernGL
from PIL import Image

ctx = ModernGL.create_standalone_context()

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);
        }
    '''),
])

vbo = ctx.buffer(struct.pack('6f', 0.0, 0.8, -0.6, -0.8, 0.6, -0.8))
vao = ctx.simple_vertex_array(prog, vbo, ['vert'])

fbo = ctx.framebuffer(ctx.renderbuffer((512, 512)))

fbo.use()
ctx.clear(0.9, 0.9, 0.9)
vao.render()

pixels = fbo.read(components=3, alignment=1)
img = Image.frombytes('RGB', fbo.size, pixels).transpose(Image.FLIP_TOP_BOTTOM)
img.show()

@@ -620,19 +620,19 @@
 o.use()%0A
-ctx
+fbo
 .clear(0

clear fbo directly