add CRT shader

godot/Main.tscn

@@ -1,8 +1,9 @@
-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=5 format=2]
 
 [ext_resource path="res://Main.gdns" type="Script" id=1]
 [ext_resource path="res://levels/Level2.tscn" type="PackedScene" id=2]
 [ext_resource path="res://monitor/Monitor.tscn" type="PackedScene" id=3]
+[ext_resource path="res://shaders/crt/crt.tscn" type="PackedScene" id=4]
 
 [node name="Main" type="Node"]
 pause_mode = 2
@@ -13,3 +14,5 @@ level = ExtResource( 2 )
 pause_mode = 1
 
 [node name="Monitor" parent="." instance=ExtResource( 3 )]
+
+[node name="CRT" parent="." instance=ExtResource( 4 )]

godot/project.godot

@@ -19,7 +19,7 @@ config/icon="res://icon.png"
 
 window/size/width=512
 window/size/height=288
-window/stretch/mode="viewport"
+window/stretch/mode="2d"
 window/stretch/aspect="keep"
 
 [editor]

godot/shaders/crt/crt.shader

@@ -0,0 +1,73 @@
+shader_type canvas_item;
+
+const float PI = 3.14159;
+
+uniform vec2 resolution = vec2(1024.0, 576.0);
+
+uniform bool show_curve = false;
+uniform bool show_vignette = false;
+uniform bool show_horizontal_scan_lines = true;
+uniform bool show_vertical_scan_lines = false;
+uniform bool gray_scale = false;
+
+uniform float curvature_x_amount : hint_range(3.0, 15.0, 0.01) = 6.0; 
+uniform float curvature_y_amount : hint_range(3.0, 15.0, 0.01) = 6.0;
+uniform vec4 corner_color : hint_color = vec4(0.0, 0.0, 0.0, 1.0);
+
+uniform float vignette_size : hint_range(1, 300, 0.1) = 4.0;
+uniform float vignette_opacity : hint_range(0.0, 1.0, 0.01) = 1.0;
+
+const float brightness = 3.0;
+
+vec2 uv_curve(vec2 uv) {
+	if (show_curve) {
+		uv = uv * 2.0 - 1.0;
+		vec2 offset = abs(uv.yx) / vec2(curvature_x_amount, curvature_y_amount);
+		uv = uv + uv * offset * offset;
+		uv = uv * 0.5 + 0.5;
+	}
+	return uv;
+}
+
+void fragment() {
+	vec2 screen_uv = uv_curve(SCREEN_UV);
+	vec3 color = texture(SCREEN_TEXTURE, screen_uv).rgb;
+	
+	if (show_horizontal_scan_lines || show_vertical_scan_lines) {
+		color.r = texture(SCREEN_TEXTURE, uv_curve(SCREEN_UV) + vec2(SCREEN_PIXEL_SIZE.x * 0.0), 0.0).r;
+		color.g = texture(SCREEN_TEXTURE, uv_curve(SCREEN_UV) + vec2(SCREEN_PIXEL_SIZE.x * 0.0), 0.0).g;
+		color.b = texture(SCREEN_TEXTURE, uv_curve(SCREEN_UV) + vec2(SCREEN_PIXEL_SIZE.x * 0.0), 0.0).b;
+	}
+	
+	if (show_vignette) {
+		float vignette = UV.x * UV.y * (1.0 - UV.x) * (1.0 - UV.y);
+		vignette = clamp(pow((resolution.x / vignette_size) * vignette, vignette_opacity), 0.0, 1.0);
+		color *= vignette;
+	}
+	
+	if (show_horizontal_scan_lines) {
+		float s = sin(uv_curve(SCREEN_UV).y * resolution.y / 2.0 * PI);
+		s = (s * 0.5 + 0.5) * 0.9 + 0.1;
+		vec4 scan_line = vec4(vec3(pow(s, 0.25)), 1.0);
+		color *= scan_line.rgb;
+	}
+	
+	if (show_vertical_scan_lines) {
+		float s = sin(uv_curve(SCREEN_UV).x * resolution.x / 2.0 * PI);
+		s = (s * 0.5 + 0.5) * 0.9 + 0.1;
+		vec4 scan_line = vec4(vec3(pow(s, 0.25)), 1.0);
+		color *= scan_line.rgb;
+	}
+	
+	if (show_curve) {
+		if (screen_uv.x < 0.0 || screen_uv.x > 1.0 || screen_uv.y < 0.0 || screen_uv.y > 1.0) {
+			color = corner_color.rgb;
+		}
+	}
+
+	if (gray_scale) {
+		float avg = (color.r + color.g + color.b) / brightness;
+		color = vec3(avg);
+	}
+	COLOR = vec4(color, 1.0);
+}

godot/shaders/crt/crt.tres

@@ -0,0 +1,17 @@
+[gd_resource type="ShaderMaterial" load_steps=2 format=2]
+
+[ext_resource path="res://shaders/crt/crt.shader" type="Shader" id=1]
+
+[resource]
+shader = ExtResource( 1 )
+shader_param/resolution = Vector2( 1280, 720 )
+shader_param/show_curve = false
+shader_param/show_vignette = false
+shader_param/show_horizontal_scan_lines = true
+shader_param/show_vertical_scan_lines = false
+shader_param/gray_scale = false
+shader_param/curvature_x_amount = 6.0
+shader_param/curvature_y_amount = 6.0
+shader_param/corner_color = Color( 0, 0, 0, 1 )
+shader_param/vignette_size = 4.0
+shader_param/vignette_opacity = 1.0

godot/shaders/crt/crt.tscn

@@ -0,0 +1,11 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://shaders/crt/crt.tres" type="Material" id=1]
+
+[node name="CRT" type="CanvasLayer"]
+
+[node name="ColorRect" type="ColorRect" parent="."]
+material = ExtResource( 1 )
+anchor_right = 1.0
+anchor_bottom = 1.0
+mouse_filter = 2