155 lines
6.1 KiB
GDScript
155 lines
6.1 KiB
GDScript
extends Node
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## Day/night cycle. Moves the sun along its arc and drives sky colours, sun and
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## moon light, ambient light and fog from the time of day.
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##
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## Time is a fraction of a day (0 = midnight, 0.25 = 06:00 sunrise,
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## 0.5 = noon, 0.75 = 18:00 sunset). One day lasts `day_length` real seconds
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## (20 min). Saved with the world (see world.gd collect_save).
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signal new_day(day: int)
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@export var day_length := 1200.0
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@export var sun_tilt_deg := 35.0 ## arc leans toward +Z, so noon sun sits at 55°
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const DAY_BIAS := 0.2
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var day := 1
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var time := 8.0 / 24.0
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var frozen := false ## title-screen backdrop: hold a fixed time
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var sun: DirectionalLight3D
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var moon: DirectionalLight3D
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var env: Environment
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var sky_mat: ShaderMaterial
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var daylight := 1.0 ## 0 at night, 1 in full day (smooth)
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var sun_height := 1.0 ## sin of sun elevation (-1..1)
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var _sky_timer := 0.0
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# Palette: [zenith, horizon, fog]
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const DAY_COLS := [Color(0.24, 0.44, 0.72), Color(0.72, 0.79, 0.85), Color(0.70, 0.77, 0.85)]
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const DUSK_COLS := [Color(0.22, 0.27, 0.48), Color(0.98, 0.62, 0.38), Color(0.82, 0.62, 0.50)]
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const NIGHT_COLS := [Color(0.02, 0.03, 0.07), Color(0.07, 0.09, 0.16), Color(0.07, 0.09, 0.14)]
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const OVERCAST_COLS := [Color(0.40, 0.44, 0.49), Color(0.58, 0.61, 0.64), Color(0.56, 0.59, 0.62)]
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const BASE_FOG := 0.0035 ## default_env.tres fog_density
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var weather: Node ## weather.gd, set by world.gd
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var _flash_shown := false
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func setup(world_sun: DirectionalLight3D, environment: Environment) -> void:
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sun = world_sun
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env = environment
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sky_mat = env.sky.sky_material as ShaderMaterial
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moon = DirectionalLight3D.new()
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moon.name = "Moon"
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moon.light_color = Color(0.55, 0.65, 1.0)
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moon.shadow_enabled = false
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moon.directional_shadow_max_distance = 120.0
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moon.sky_mode = DirectionalLight3D.SKY_MODE_LIGHT_ONLY # keep the sky shader's LIGHT0 = sun
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sun.add_sibling(moon)
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apply(true)
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func hours() -> float:
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return time * 24.0
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func clock_text() -> String:
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var h := hours()
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return "Day %d %02d:%02d" % [day, int(h), int(fmod(h, 1.0) * 60.0)]
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func is_night() -> bool:
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return daylight < 0.3
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## Every 7th night is a wolf moon: the moon turns red and an alpha hunts with
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## the pack (wolf_pack.gd). Worked out from the day alone, so every game on a
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## server agrees without being told.
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static func wolf_moon_day(d: int) -> bool:
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return d >= 7 and d % 7 == 0
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## Tonight's moon is a wolf moon (the small hours count as the night before).
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func wolf_moon_now() -> bool:
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var h := hours()
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return (h >= 19.5 or h < 5.5) and wolf_moon_day(day - (1 if h < 5.5 else 0))
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func advance(seconds: float) -> void:
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time += seconds / day_length
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while time >= 1.0:
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time -= 1.0
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day += 1
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new_day.emit(day)
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apply(false)
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func _process(delta: float) -> void:
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if not frozen:
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advance(delta)
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## Updates lights every call; the sky material (which triggers a radiance
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## rebuild) only a few times a second unless `force`.
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func apply(force: bool) -> void:
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if sun == null:
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return
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var a := (time - 0.25) * TAU
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var t := deg_to_rad(sun_tilt_deg)
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# +DAY_BIAS lifts the whole arc: sunrise ~05:00, sunset ~19:00, so days
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# are longer than nights and dusk lingers.
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var to_sun := Vector3(cos(a), sin(a) * cos(t) + DAY_BIAS, sin(a) * sin(t)).normalized()
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sun_height = to_sun.y
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daylight = smoothstep(-0.2, 0.25, to_sun.y)
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var low := 1.0 - smoothstep(0.05, 0.45, absf(to_sun.y)) # 1 near the horizon
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# Weather (weather.gd) dims the sun, thickens fog and greys the sky.
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var w_light := 1.0
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var w_fog := 1.0
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var w_clouds := 0.3
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var w_flash := 0.0
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if weather != null:
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w_light = weather.light
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w_fog = weather.fog
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w_clouds = weather.clouds
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w_flash = weather.flash
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var overcast := smoothstep(0.5, 1.0, w_clouds)
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sun.global_basis = Basis.looking_at(-to_sun if to_sun.y > -0.2 else Vector3.DOWN, Vector3.FORWARD)
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sun.light_energy = 1.8 * smoothstep(-0.03, 0.15, to_sun.y) * w_light
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sun.light_color = Color(1.0, 0.95, 0.83).lerp(Color(1.0, 0.58, 0.32), low)
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sun.visible = sun.light_energy > 0.01
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sun.shadow_enabled = sun.visible
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var moon_dir := Vector3(-to_sun.x, absf(to_sun.y) * 0.8 + 0.25, -to_sun.z * 0.5).normalized()
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moon.global_basis = Basis.looking_at(-moon_dir, Vector3.FORWARD)
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var red := wolf_moon_now()
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moon.light_color = Color(1.0, 0.38, 0.3) if red else Color(0.55, 0.65, 1.0)
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moon.light_energy = (0.5 if red else 0.38) * (1.0 - daylight) * (1.0 - 0.6 * overcast)
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moon.visible = moon.light_energy > 0.01
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moon.shadow_enabled = moon.visible and not sun.visible
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env.ambient_light_energy = lerpf(0.3, 1.0, daylight) * lerpf(1.0, 0.85, overcast) + w_flash * 3.0
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env.fog_light_energy = lerpf(0.25, 1.0, daylight) * lerpf(1.0, 0.7, overcast) + w_flash * 2.0
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env.volumetric_fog_density = lerpf(0.0025, 0.0045, daylight) * lerpf(1.0, 2.0, overcast)
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env.fog_density = BASE_FOG * w_fog
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_sky_timer -= get_process_delta_time()
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if not force and _sky_timer > 0.0 and w_flash < 0.05 and not _flash_shown:
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return
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_flash_shown = w_flash >= 0.05
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_sky_timer = 0.25
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var cols: Array = []
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for i in range(3):
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var dayc: Color = DAY_COLS[i].lerp(DUSK_COLS[i], low * daylight * (1.0 - overcast * 0.7))
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dayc = dayc.lerp(OVERCAST_COLS[i], overcast * 0.85)
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var night: Color = NIGHT_COLS[i]
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if red:
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night = night.lerp(Color(0.2, 0.04, 0.04), 0.5) # a blood-red night sky
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cols.append(night.lerp(dayc, daylight))
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env.fog_light_color = cols[2]
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if sky_mat != null:
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sky_mat.set_shader_parameter("zenith_col", cols[0])
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sky_mat.set_shader_parameter("horizon_col", cols[1])
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sky_mat.set_shader_parameter("energy", lerpf(0.35, 1.0, daylight) * lerpf(1.0, 0.72, overcast) + w_flash * 2.5)
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sky_mat.set_shader_parameter("star_strength", (1.0 - smoothstep(0.0, 0.35, daylight)) * (1.0 - overcast))
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sky_mat.set_shader_parameter("cloud_cover", lerpf(0.35, 1.05, w_clouds))
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var lit := Color(0.16, 0.18, 0.24).lerp(Color(1, 1, 1), daylight)
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sky_mat.set_shader_parameter("cloud_lit", lit.lerp(lit * Color(0.55, 0.57, 0.6), overcast))
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sky_mat.set_shader_parameter("sun_tint", Color(1.0, 0.86, 0.62).lerp(Color(1.0, 0.55, 0.3), low))
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## 0..100 "how warm the air is" before fires, shelter and clothes.
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func air_warmth() -> float:
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return lerpf(22.0, 68.0, daylight)
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