constexpr int max_tiles = 128;
constexpr int tile_size = 32;
constexpr int panel_tile_size = 128;
local_persist int tiles[max_tiles][max_tiles] = zero;
local_persist s_v2 offset = zero;

local_persist float zoom = 1;

if(is_key_down(key_up, true))
{
    offset.y -= 10;
}
if(is_key_down(key_down, true))
{
    offset.y += 10;
}

if(is_key_down(key_left, true))
{
    offset.x -= 10;
}
if(is_key_down(key_right, true))
{
    offset.x += 10;
}

zoom += input->wheel_movement * 0.1f;

draw_rect_ui(v2(0), -5, c_world_size, color(0.1f).rgb);
draw_rect_ui(v2(0), -4, v2(800, c_world_size.y), color(0.5f).rgb);

local_persist b8 once = false;
if(!once)
{
    once = true;
    for(int y = 0; y < max_tiles; y++)
    {
        for(int x = 0; x < max_tiles; x++)
        {
            tiles[y][x] = game->client_rng.randu() % 2;
        }
    }
}


for(int y = 0; y < 10; y++)
{
    for(int x = 0; x < 10; x++)
    {
        s_v2 pos = v2(
            (x * panel_tile_size - offset.x) * zoom,
            (y * panel_tile_size - offset.y) * zoom
        );
        s_v2 size = v2(panel_tile_size * zoom);
        if(pos.x + size.x > 800) { continue; }

        draw_texture_ui(
            e_texture_atlas,
            pos,
            0.0f,
            size,
            color(1).rgb,
            v2i(x, y)
        );
    }
}

for(int y = 0; y < max_tiles; y++)
{
    for(int x = 0; x < max_tiles; x++)
    {
        s_v2i index = tiles[y][x] == 0 ? v2i(0, 0) : v2i(0, 1);
        draw_texture_ui(
            e_texture_atlas,
            v2(
                800 + tile_size * x,
                tile_size * y
            ),
            0.0f,
            v2(tile_size),
            color(1).rgb,
            index
        );
    }
}