module main

import gg
import sokol.gfx

fn main() {
    mut context := gg.new_context(
        frame_fn: frame
        width: 500
        height: 500
    )
    context.run()
}

fn frame(mut ctx gg.Context) {
    ctx.begin()
    id := ctx.new_streaming_image(ctx.width, ctx.height, 4, pixel_format: .rgba8)
    mut img := ctx.get_cached_image_by_idx(id)
    mut bytes := []u8{len: img.width * img.height * 4, cap: img.width * img.height * 4}
    for y in 0 .. img.height {
        for x in 0 .. img.width {
            unsafe {
                bytes[(x + img.width * y) * 4] = 100
                bytes[(x + img.width * y) * 4 + 1] = 100
                bytes[(x + img.width * y) * 4 + 2] = 100
                bytes[(x + img.width * y) * 4 + 3] = 255
            }
        }
    }
    unsafe {
        img.update_pixel_data(&bytes[0])
    }
    ctx.draw_image(0, 0, ctx.width, ctx.height, img)
    ctx.remove_cached_image_by_idx(id)
    ctx.end()
    gfx.destroy_image(img.simg)
    unsafe {
        free(&bytes[0])
    }
}