From 38b247487309ca89bf2d94bb321f12059861db9d Mon Sep 17 00:00:00 2001
From: Malfurious <m@lfurio.us>
Date: Wed, 14 Sep 2022 03:50:09 -0400
Subject: Consolidate water-related assets

Stray files are moved into a new directory.  The water MeshInstance is
made into a new scene, as I will be adding components to it.
---
 water/Water.gd | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 water/Water.gd

(limited to 'water/Water.gd')

diff --git a/water/Water.gd b/water/Water.gd
new file mode 100644
index 0000000..da7666c
--- /dev/null
+++ b/water/Water.gd
@@ -0,0 +1,113 @@
+extends MeshInstance
+tool
+
+export var wave1_steepness = 0.5 setget _set_wave1_steepness
+export var wave1_wavelength = 10.0 setget _set_wave1_wavelength
+export var wave1_direction = Vector2(1.0,0.0) setget _set_wave1_direction
+
+export var wave2_steepness = 0.5 setget _set_wave2_steepness
+export var wave2_wavelength = 10.0 setget _set_wave2_wavelength
+export var wave2_direction = Vector2(1.0,0.0) setget _set_wave2_direction
+
+export var wave3_steepness = 0.5 setget _set_wave3_steepness
+export var wave3_wavelength = 10.0 setget _set_wave3_wavelength
+export var wave3_direction = Vector2(1.0,0.0) setget _set_wave3_direction
+
+func _set_wave_prop(idx, prop, val):
+    if val == null: return
+    if idx >= waves.size(): return
+    waves[idx].set(prop,val)
+    _update_wave(0)
+
+func _set_wave1_steepness(val):
+    wave1_steepness = val
+    _set_wave_prop(0,"steepness",val)
+
+func _set_wave1_wavelength(val):
+    wave1_wavelength = val
+    _set_wave_prop(0,"wavelength",val)
+
+func _set_wave1_direction(val):
+    wave1_direction = val
+    _set_wave_prop(0,"direction",val)
+
+func _set_wave2_steepness(val):
+    wave2_steepness = val
+    _set_wave_prop(1,"steepness",val)
+
+func _set_wave2_wavelength(val):
+    wave2_wavelength = val
+    _set_wave_prop(1,"wavelength",val)
+
+func _set_wave2_direction(val):
+    wave2_direction = val
+    _set_wave_prop(1,"direction",val)
+
+func _set_wave3_steepness(val):
+    wave3_steepness = val
+    _set_wave_prop(2,"steepness",val)
+
+func _set_wave3_wavelength(val):
+    wave3_wavelength = val
+    _set_wave_prop(2,"wavelength",val)
+
+func _set_wave3_direction(val):
+    wave3_direction = val
+    _set_wave_prop(2,"direction",val)
+
+var _time = 0.0 setget _set_time
+var waves = []
+func _ready():
+    waves.push_back(Wave.new(wave1_steepness,wave1_wavelength,wave1_direction,_time))
+    waves.push_back(Wave.new(wave2_steepness,wave2_wavelength,wave2_direction,_time))
+    waves.push_back(Wave.new(wave3_steepness,wave3_wavelength,wave3_direction,_time))
+
+func _wave_to_quad(wave):
+    return Quat(wave.steepness,wave._k,wave._a,wave._t)
+
+func _update_wave(idx):
+    var material = self.get_surface_material(0)
+    material.set_shader_param("wave" + str(idx+1), _wave_to_quad(waves[idx]))
+    material.set_shader_param("wave" + str(idx+1) + "_dir", waves[idx].direction)
+
+func _set_time(val):
+    _time = val
+    for idx in waves.size():
+        waves[idx]._time = _time
+        _update_wave(idx)
+
+func _physics_process(delta):
+    self._time += delta
+    #self._time = 0.0
+
+func gertsner_wave(pos, idx):
+    if idx >= waves.size(): return 0.0
+    var wave = waves[idx]
+    var k = wave._k
+    var a = wave._a
+    var t = wave._t
+
+    var d = wave.direction.normalized()
+    var f = k * (d.dot(Vector2(pos.x,pos.z)) - t)
+
+    var tmp = a * cos(f)
+    var new_pos = Vector3(d.x * tmp, a * sin(f), d.y * tmp)
+
+    return new_pos
+
+func sample_wave(pos):
+    var new_pos = Vector3(pos.x,0,pos.z)
+    for idx in waves.size():
+        new_pos += gertsner_wave(pos, idx)
+    return new_pos
+
+func height(pos):
+    var old_pos = pos
+    var y = old_pos.y
+    for _i in range(2):
+        var new_pos = sample_wave(old_pos)
+        y = new_pos.y
+        new_pos = old_pos - (new_pos - old_pos)
+        old_pos = new_pos
+    y += self.global_transform.origin.y
+    return y
-- 
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