module main

import gg

const win_width = 100
const win_height = 100

struct App {
mut:
    gg    &gg.Context = unsafe { nil }
    image int
}

fn main() {
    mut app := &App{}
    app.gg = gg.new_context(
        width:        win_width
        height:       win_height
        window_title: 'issue 10989'
        frame_fn:     frame
        user_data:    app
        init_fn:      initialize
    )
    app.gg.run()
}

fn initialize(mut app App) {
    buffer := []u8{len: 10 * 10}
    app.image = app.gg.new_streaming_image(10, 10, 1, pixel_format: .r8)
    app.gg.update_pixel_data(app.image, buffer.data)
}

fn frame(mut app App) {
    app.gg.begin()
    app.gg.draw_image_by_id(0, 0, 10, 10, app.image)
    app.gg.end()
}