112 lines
4.5 KiB
GDScript
112 lines
4.5 KiB
GDScript
extends Node2D
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## Ground wash stays in world space after emission, independently of the lander.
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const LIMIT := 220
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var source: Control
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var weather: Node2D
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var _rng := RandomNumberGenerator.new()
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var _particles: Array[Dictionary] = []
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var _soft: GradientTexture2D
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var _shadow: Sprite2D
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var _emission := 0.0
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var _tree_timer := 0.0
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var _near_trees := false
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var _surface_kind := "dust"
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var _ground := Color("b5a17a")
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func _ready() -> void:
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name = "SurfaceFlightEffects"
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z_index = 21
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texture_filter = CanvasItem.TEXTURE_FILTER_LINEAR
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_rng.seed = source.progress.visit_seed ^ 0x44555354
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_ground = (source.world.data.landscape.sand as Color).lerp(source.world.data.landscape.low,0.25)
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var gradient := Gradient.new()
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gradient.set_color(0,Color.WHITE)
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gradient.set_color(1,Color(1,1,1,0))
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_soft = GradientTexture2D.new()
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_soft.gradient = gradient
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_soft.width = 64
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_soft.height = 64
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_soft.fill = GradientTexture2D.FILL_RADIAL
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_soft.fill_from = Vector2(0.5,0.5)
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_soft.fill_to = Vector2(0.5,1)
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_shadow = Sprite2D.new()
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_shadow.name = "LanderShadow"
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_shadow.texture = source.lander.texture
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_shadow.scale = source.lander.scale*0.76
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_shadow.z_index = -1
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var material := ShaderMaterial.new()
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material.shader = preload("res://resources/effects/lander_shadow.gdshader")
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_shadow.material = material
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add_child(_shadow)
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func surface_kind(point: Vector2) -> String:
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if int(source.world.data.landscape.index) == 5: return "snow"
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var h: float = weather.terrain_height(point)
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if h < 0.29 or (int(source.world.data.landscape.index) == 2 and h < 0.37): return "spray"
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return "rock" if h > 0.64 else "dust"
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func _process(delta: float) -> void:
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if not is_instance_valid(source): return
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visible = not source._ending
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if source._ending: return
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var pose: Transform2D = source.lander.global_transform
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pose.origin = source._previous_position.lerp(source.lander.position,Engine.get_physics_interpolation_fraction())
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var point := pose.origin
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_shadow.position = point+Vector2(48,64)
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_shadow.rotation = pose.get_rotation()
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_shadow.visible = source.lander.visible
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_tree_timer -= delta
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if _tree_timer <= 0:
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_tree_timer = 0.4
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_near_trees = false
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for tree in source.world.data.trees:
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if point.distance_squared_to(tree.position) < 170*170:
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_near_trees = true
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break
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_surface_kind = surface_kind(point)
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var thrust: bool = source.engine_thrust_active()
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var brake: bool = not source._dialog.visible and Input.is_action_pressed("ship_brake") and source._motion.velocity.length() > 12
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var boost: bool = source._motion.boost_active and thrust
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if thrust or brake:
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var rate := 90.0 if boost else (46.0 if thrust else 30.0)
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if _surface_kind == "rock": rate *= 0.45
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_emission += delta*rate
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while _emission >= 1:
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_emission -= 1
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if _particles.size() < LIMIT: _emit(point,pose.get_rotation(),boost)
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else: _emission = 0
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for index in range(_particles.size()-1,-1,-1):
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var particle: Dictionary = _particles[index]
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particle.age += delta
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particle.position += (particle.velocity+weather.wind*0.7)*delta
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particle.velocity *= exp(-delta*1.3)
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if particle.age > particle.life: _particles.remove_at(index)
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queue_redraw()
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func _emit(point: Vector2, angle: float, boost: bool) -> void:
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var kind := _surface_kind
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if _near_trees and kind == "dust" and _rng.randf() < 0.20: kind = "leaf"
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var nozzle := Vector2(_rng.randf_range(-29,29),_rng.randf_range(22,42)).rotated(angle)
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var scatter := Vector2(_rng.randf_range(-48,48),_rng.randf_range(20,65)).rotated(angle)
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_particles.append({"position":point+nozzle,"velocity":scatter+source._motion.velocity*0.1,"age":0.0,"life":_rng.randf_range(1.5,2.8),"size":_rng.randf_range(15,25)*(1.55 if boost else 1.0),"kind":kind,"angle":_rng.randf_range(-PI,PI)})
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func _draw() -> void:
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for particle in _particles:
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var t := clampf(particle.age/particle.life,0,1)
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var alpha := sin(t*PI)
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var kind: String = particle.kind
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var radius: float = particle.size*(1.0+t*1.9)
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var color := _ground
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color.a = alpha*0.32
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if kind == "rock": color = Color(0.65,0.65,0.59,alpha*0.19)
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if kind == "snow": color = Color(0.88,0.95,0.95,alpha*0.38)
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if kind == "spray": color = Color(0.66,0.83,0.80,alpha*0.30)
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if kind == "leaf":
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draw_set_transform(particle.position,particle.angle+t*2,Vector2(1,0.45))
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draw_circle(Vector2.ZERO,2.5,Color(0.49,0.35,0.17,alpha*0.7),true,-1,true)
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draw_set_transform(Vector2.ZERO)
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else:
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draw_texture_rect(_soft,Rect2(particle.position-Vector2.ONE*radius,Vector2.ONE*radius*2),false,color)
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if kind in ["spray","snow"]:
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draw_circle(particle.position+Vector2(4,-7)*t,1.4,Color(color,alpha*0.38),true,-1,true)
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