module main
let max(x, y: f64) =
if x >= y { x }
else { y }
let min(x, y: f64) =
if x <= y { x }
else { y }
let clamp(x, low, high: f64) =
max(low, min(x, high))
// Vertical distances use screen-height world units.
// One world unit is always equal to the screen height.
let gravity: f64 = -4.0
let flap_height: f64 = 0.135
let terminal_velocity: f64 = -2.5
let bird_size: f64 = 0.08
let bird_x: f64 = 0.35
// These values are world units, not proportions of screen width.
let pipe_width: f64 = 0.12
let pipe_gap_size: f64 = 0.265
let pipe_spacing: f64 = 0.475
let pipe_speed: f64 = 0.30
let double_pipe_speed_multiplier: f64 = 2.5
let double_pipe_points_multiplier: u32 = 2
let pipe_buffer_size = comptime 32
let background_scroll_speed: f64 = 0.1
let base_scroll_speed: f64 = 1.3333
let base_height_fraction: f64 = 0.20
let restart_grace_period: f64 = 0.2
let Pipe = type struct {
// Horizontal position in screen-height world units.
x: f64,
// Vertical gap centre, where 0.0 is the bottom and 1.0 is the top.
gap_y: f64,
// Whether the bird has already received a point for this pipe.
passed: bool,
}
let GameState = type struct {
bird_y: f64,
bird_velocity_y: f64,
pipes: [pipe_buffer_size]Pipe,
delta_time: f64,
background_scroll: f64,
base_scroll: f64,
started: bool,
paused: bool,
lost: bool,
time_since_loss: f64,
show_collision_boxes: bool,
double_pipe_speed: bool,
points: u32,
}