[gd_scene load_steps=12 format=2]

[ext_resource path="res://Assets/topdown-player.svg" type="Texture" id=1]
[ext_resource path="res://Demos/StarFieldDemo.tscn" type="PackedScene" id=2]
[ext_resource path="res://GhostTrail/GhostTrail.tscn" type="PackedScene" id=3]


[sub_resource type="GDScript" id=1]
script/source = "extends Camera2D

export(float) var speed = 0

func _process(delta):
	translate((Vector2.RIGHT * speed) * delta)
"

[sub_resource type="Shader" id=2]
code = "shader_type canvas_item;

const float SAMPLES = 71.0;
const float WIDTH = 0.04734573810584494679397346954847; //1.0 / sqrt(PI * 2 * SAMPLES)

uniform vec2 blur_scale = vec2(1, 0);

float gaussian(float x) {
    float x_squared = x*x;

    return WIDTH * exp((x_squared / (2.0 * SAMPLES)) * -1.0);
}

void fragment() {
	vec2 scale = TEXTURE_PIXEL_SIZE * blur_scale;
	
	float weight = 0.0;
	float total_weight = 0.0;
	vec4 color = vec4(0.0);
	
	for(int i=-int(SAMPLES)/2; i < int(SAMPLES)/2; ++i) {
		weight = gaussian(float(i));
		color.rgb += texture(TEXTURE, UV + scale * vec2(float(i))).rgb * weight;
		total_weight += weight;
	}
	
	COLOR.rgb = color.rgb / total_weight;
}"

[sub_resource type="ShaderMaterial" id=3]
shader = SubResource( 2 )
shader_param/blur_scale = Vector2( 0, 0 )

[sub_resource type="ViewportTexture" id=4]
viewport_path = NodePath("Viewport")

[sub_resource type="Gradient" id=5]
colors = PoolColorArray( 1, 1, 1, 0.435294, 1, 1, 1, 0 )

[sub_resource type="GradientTexture" id=6]
gradient = SubResource( 5 )

[sub_resource type="ParticlesMaterial" id=7]
flag_align_y = true
flag_rotate_y = true
flag_disable_z = true
direction = Vector3( 0, -1, 0 )
spread = 0.0
gravity = Vector3( 0, 0, 0 )
initial_velocity = 1.0
orbit_velocity = 0.0
orbit_velocity_random = 0.0
scale = 0.7
color_ramp = SubResource( 6 )

[sub_resource type="Animation" id=8]
length = 6.0
loop = true
step = 0.05
tracks/0/type = "value"
tracks/0/path = NodePath("Viewport/Camera2D:speed")
tracks/0/interp = 1
tracks/0/loop_wrap = true
tracks/0/imported = false
tracks/0/enabled = true
tracks/0/keys = {
"times": PoolRealArray( 0, 1.6, 2.25, 4 ),
"transitions": PoolRealArray( 1, 2, 1, 2 ),
"update": 0,
"values": [ 200.0, 200.0, 2000.0, 4000.0 ]
}
tracks/1/type = "value"
tracks/1/path = NodePath("BlurHorizontal:material:shader_param/blur_scale")
tracks/1/interp = 1
tracks/1/loop_wrap = true
tracks/1/imported = false
tracks/1/enabled = true
tracks/1/keys = {
"times": PoolRealArray( 0, 1.6, 2.25, 4 ),
"transitions": PoolRealArray( 1, 2, 1, 2 ),
"update": 0,
"values": [ Vector2( 0, 0 ), Vector2( 0, 0 ), Vector2( 4, 0 ), Vector2( 6, 0 ) ]
}
tracks/2/type = "value"
tracks/2/path = NodePath("Sprite/GhostTrail:emitting")
tracks/2/interp = 1
tracks/2/loop_wrap = true
tracks/2/imported = false
tracks/2/enabled = true
tracks/2/keys = {
"times": PoolRealArray( 0, 1.6, 5.5 ),
"transitions": PoolRealArray( 1, 1, 1 ),
"update": 1,
"values": [ false, true, false ]
}
tracks/3/type = "value"
tracks/3/path = NodePath("Sprite/GhostTrail:speed_scale")
tracks/3/interp = 1
tracks/3/loop_wrap = true
tracks/3/imported = false
tracks/3/enabled = true
tracks/3/keys = {
"times": PoolRealArray( 0, 1.6, 2.25, 4 ),
"transitions": PoolRealArray( 2, 2, 1, 2 ),
"update": 0,
"values": [ 0.2, 0.2, 1.0, 4.0 ]
}
tracks/4/type = "value"
tracks/4/path = NodePath("Sprite/GhostTrail:process_material:initial_velocity")
tracks/4/interp = 1
tracks/4/loop_wrap = true
tracks/4/imported = false
tracks/4/enabled = true
tracks/4/keys = {
"times": PoolRealArray( 0, 1.6, 2.25 ),
"transitions": PoolRealArray( 1, 1, 1 ),
"update": 0,
"values": [ 1.0, 1.0, 500.0 ]
}

[node name="BlurTest" type="Node"]

[node name="Viewport" type="Viewport" parent="."]
size = Vector2( 1024, 600 )
render_target_v_flip = true

[node name="StarFieldTest" parent="Viewport" instance=ExtResource( 2 )]

[node name="Camera2D" type="Camera2D" parent="Viewport"]
anchor_mode = 0
current = true
script = SubResource( 1 )
speed = 200.0

[node name="BlurHorizontal" type="TextureRect" parent="."]
material = SubResource( 3 )
anchor_right = 1.0
anchor_bottom = 1.0
texture = SubResource( 4 )
__meta__ = {
"_edit_use_anchors_": false
}

[node name="Sprite" type="Sprite" parent="."]
position = Vector2( 473.5, 312.5 )
rotation = 1.5708
scale = Vector2( 0.7, 0.7 )
texture = ExtResource( 1 )

[node name="GhostTrail" parent="Sprite" instance=ExtResource( 3 )]
emitting = false
speed_scale = 0.2
process_material = SubResource( 7 )

[node name="AnimationPlayer" type="AnimationPlayer" parent="."]
autoplay = "Accelerate"
anims/Accelerate = SubResource( 8 )