From 038935709ffde6236b0dc04e62c62977fc1468b9 Mon Sep 17 00:00:00 2001
From: pennyrigate <pennyrigate@cybergal.com>
Date: Thu, 8 Dec 2022 00:56:06 -0500
Subject: [PATCH] added crt filter

---
 control.tscn         |  9 ++++++++-
 game.gd              |  5 +++++
 project.godot        |  5 +++++
 scripts/crt.gdshader | 43 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 61 insertions(+), 1 deletion(-)
 create mode 100644 scripts/crt.gdshader

diff --git a/control.tscn b/control.tscn
index a837b7a..5958a7f 100644
--- a/control.tscn
+++ b/control.tscn
@@ -1,10 +1,17 @@
-[gd_scene load_steps=5 format=2]
+[gd_scene load_steps=6 format=2]
 
 [ext_resource path="res://scripts/scaling.gd" type="Script" id=1]
 [ext_resource path="res://graphics/borders/prideborder.png" type="Texture" id=2]
 [ext_resource path="res://maps/map01.tscn" type="PackedScene" id=3]
+[ext_resource path="res://scripts/crt.gdshader" type="Shader" id=4]
 
 [sub_resource type="ShaderMaterial" id=1]
+shader = ExtResource( 4 )
+shader_param/enabled = false
+shader_param/resolution = Vector2( 256, 192 )
+shader_param/curvature = Vector2( 6, 6 )
+shader_param/scanline_opacity = Vector2( 0.4, 0.05 )
+shader_param/brightness = 1.25
 
 [node name="Control" type="Control"]
 anchor_right = 1.0
diff --git a/game.gd b/game.gd
index caf0fc3..8bd0242 100644
--- a/game.gd
+++ b/game.gd
@@ -2,6 +2,8 @@ extends Node
 
 var resolution = Vector2(256,192)
 var current_sector = Vector2(0,0)
+#Onreadys
+onready var viewport_container = get_parent().get_node("Main/Control/ViewportContainer")
 #Collectibles
 var golds = 0
 var stars = 0
@@ -27,3 +29,6 @@ func _process(delta):
 	#Restart scene
 	if Input.is_action_just_pressed("debug_restart"):
 		get_tree().reload_current_scene()
+	#CRT FILTER
+	if Input.is_action_just_pressed("crt"):
+		viewport_container.material.set_shader_param("enabled",!viewport_container.material.get_shader_param("enabled"))
diff --git a/project.godot b/project.godot
index 0965578..09da7fd 100644
--- a/project.godot
+++ b/project.godot
@@ -77,6 +77,11 @@ sword={
 "events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":90,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
  ]
 }
+crt={
+"deadzone": 0.5,
+"events": [ Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":0,"alt":false,"shift":false,"control":false,"meta":false,"command":false,"pressed":false,"scancode":48,"physical_scancode":0,"unicode":0,"echo":false,"script":null)
+ ]
+}
 
 [physics]
 
diff --git a/scripts/crt.gdshader b/scripts/crt.gdshader
new file mode 100644
index 0000000..18fc6d8
--- /dev/null
+++ b/scripts/crt.gdshader
@@ -0,0 +1,43 @@
+shader_type canvas_item;
+
+const float PI = 3.1415926535;
+
+uniform bool enabled = true;
+uniform vec2 resolution;
+uniform vec2 curvature;
+uniform vec2 scanline_opacity;
+uniform float brightness;
+
+vec2 curve_uv(vec2 uv) {
+    uv = uv * 2.0 - 1.0;
+    vec2 offset = abs(uv.yx) / vec2(curvature.x, curvature.y);
+    uv = uv + uv * offset * offset;
+    uv = uv * 0.5 + 0.5;
+    return uv;
+}
+
+vec3 scanline_intensity(float uv, float res, float opacity) {
+    float intensity = sin((uv * res - 0.25) * PI * 2.0);
+    intensity = ((0.5 * intensity) + 0.5) * 0.9 + 0.1;
+    return vec3(pow(intensity, opacity));
+}
+
+void fragment() {
+	if (enabled) {
+	vec2 curved_uv = curve_uv(UV);
+	vec3 base_color = texture(TEXTURE, curved_uv).rgb;
+	
+	base_color += vec3(1.0/256.0);
+	base_color *= scanline_intensity(curved_uv.x, resolution.x, scanline_opacity.y);
+	base_color *= scanline_intensity(curved_uv.y, resolution.y, scanline_opacity.x);
+	base_color *= vec3(brightness);
+	
+	if (curved_uv.x < 0.0 || curved_uv.y < 0.0 || curved_uv.x > 1.0 || curved_uv.y > 1.0) {
+        COLOR = vec4(0.0, 0.0, 0.0, 1.0);
+    } else {
+        COLOR = vec4(base_color, 1.0);
+    }
+	} else {
+		COLOR = texture(TEXTURE, UV);
+	}
+}
\ No newline at end of file