main.tscn

[gd_scene load_steps=18 format=2]

[ext_resource path="res://chip8.tscn" type="PackedScene" id=1]
[ext_resource path="res://shaders/white.png" type="Texture" id=2]
[ext_resource path="res://shaders/crt_material.tres" type="Material" id=3]
[ext_resource path="res://ui.tscn" type="PackedScene" id=4]
[ext_resource path="res://shaders/CRTFrame.png" type="Texture" id=5]

[sub_resource type="Shader" id=1]

code = "shader_type canvas_item;

uniform float BarrelPower =1.05;//1.1;

vec2 distort(vec2 p) 
{

	float angle = p.y / p.x;
	float theta = atan(p.y,p.x);
	float radius = pow(length(p), BarrelPower);
	
	p.x = radius * cos(theta);
	p.y = radius * sin(theta);
	
	return 0.5 * (p + vec2(1.0,1.0));
}
void fragment()
{
	
vec2 xy = SCREEN_UV * 2.0;
xy.x -= 1.0;
xy.y -= 1.0;

float d = length(xy);
if(d < 1.5){
	xy = distort(xy);
}
else{
	xy = SCREEN_UV;
}
COLOR = texture(SCREEN_TEXTURE,xy);
}



"
_sections_unfolded = [ "Resource" ]

[sub_resource type="ShaderMaterial" id=2]

render_priority = 0
shader = SubResource( 1 )
shader_param/BarrelPower = 1.05
_sections_unfolded = [ "Resource", "shader_param" ]

[sub_resource type="Shader" id=3]

code = "shader_type canvas_item;

uniform float color_bleeding = 2;//0.9;
uniform float bleeding_range = 2;
uniform float screen_width = 640;
void fragment()
{
	float pixel_size = 1.0/screen_width*bleeding_range;
	vec4 color_left = texture(SCREEN_TEXTURE,SCREEN_UV - vec2(pixel_size, 0));
	vec4 current_color = texture(SCREEN_TEXTURE,SCREEN_UV);
	current_color = current_color*vec4(color_bleeding,0.5,0.25,1);
	color_left = color_left*vec4(0.25,0.5,color_bleeding,1);
	COLOR.rgba = (current_color + color_left);
}"
_sections_unfolded = [ "Resource" ]

[sub_resource type="ShaderMaterial" id=4]

render_priority = 0
shader = SubResource( 3 )
shader_param/color_bleeding = 2.0
shader_param/bleeding_range = 2.0
shader_param/screen_width = 640.0
_sections_unfolded = [ "Resource", "shader_param" ]

[sub_resource type="Shader" id=5]

code = "shader_type canvas_item;

uniform float lines_distance = 2.0;
uniform float pixel_size = 2.0;
uniform float size_screen = 600;
uniform float scanline_alpha = 0.9;
uniform float lines_velocity = 5; //30.0;

void fragment()
{
	float line_row = floor((SCREEN_UV.y * size_screen/pixel_size) + mod(TIME*lines_velocity, lines_distance));

	float n = 1.0 - ceil((mod(line_row,lines_distance)/lines_distance));

vec4 c = texture(SCREEN_TEXTURE,SCREEN_UV);
c = c - n*c*(1.0 - scanline_alpha);
c.a = 1.0;
COLOR = c;
}"

[sub_resource type="ShaderMaterial" id=6]

render_priority = 0
shader = SubResource( 5 )
shader_param/lines_distance = 2.0
shader_param/pixel_size = 2.0
shader_param/size_screen = 8.0
shader_param/scanline_alpha = 0.9
shader_param/lines_velocity = 5.0
_sections_unfolded = [ "Resource", "shader_param" ]

[sub_resource type="Shader" id=7]

code = "shader_type canvas_item;

// study and understand: http://docs.godotengine.org/en/3.0/tutorials/shading/shading_language.html
// If you are writing a screen-reading shader, you may replace TEXTURE_PIXEL_SIZE by SCREEN_PIXEL_SIZE.
// Also, replace texscreen by texture(SCREEN_TEXTURE, the_uv);

uniform float screen_width = 1024;
uniform float screen_height = 600;

// Curvature
uniform float BarrelPower =1.1;
// Color bleeding
uniform float color_bleeding = 1.2;
uniform float bleeding_range_x = 3;
uniform float bleeding_range_y = 3;
// Scanline
uniform float lines_distance = 4.0;
uniform float scan_size = 2.0;
uniform float scanline_alpha = 0.9;
uniform float lines_velocity = 30.0;
vec2 distort(vec2 p) 
{

	float angle = p.y / p.x;
	float theta = atan(p.y,p.x);
	float radius = pow(length(p), BarrelPower);
	
	p.x = radius * cos(theta);
	p.y = radius * sin(theta);
	
	return 0.5 * (p + vec2(1.0,1.0));
}

void get_color_bleeding(inout vec4 current_color,inout vec4 color_left){
	current_color = current_color*vec4(color_bleeding,0.5,0.25,1);
	color_left = color_left*vec4(0.25,0.5,color_bleeding,1);
}

void get_color_scanline(vec2 uv,inout vec4 c,float TIME){
	float line_row = floor((uv.y * screen_height/scan_size) + mod(TIME*lines_velocity, lines_distance));

	float n = 1.0 - ceil((mod(line_row,lines_distance)/lines_distance));

	c = c - n*c*(1.0 - scanline_alpha);
	c.a = 1.0;

}

void fragment()
{
	
vec2 xy = SCREEN_UV * 2.0;
xy.x -= 1.0;
xy.y -= 1.0;

float d = length(xy);
if(d < 1.5){
	xy = distort(xy);
}
else{
	xy = SCREEN_UV;
}

float pixel_size_x = 1.0/screen_width*bleeding_range_x;
float pixel_size_y = 1.0/screen_height*bleeding_range_y;

//vec4 color_left = texture(SCREEN_TEXTURE,SCREEN_UV - vec2(pixel_size_x, pixel_size_y));
vec4 color_left = texture(SCREEN_TEXTURE,xy - vec2(pixel_size_x, pixel_size_y));
//vec4 current_color = texture(SCREEN_TEXTURE,SCREEN_UV);
vec4 current_color = texture(SCREEN_TEXTURE,xy);

get_color_bleeding(current_color,color_left);
vec4 c = current_color+color_left;
get_color_scanline(xy,c,TIME); // comment it to show a 3dish effect

COLOR = c;
}
"
_sections_unfolded = [ "Resource" ]

[sub_resource type="ShaderMaterial" id=8]

render_priority = 0
shader = SubResource( 7 )
shader_param/screen_width = 640.0
shader_param/screen_height = 355.0
shader_param/BarrelPower = 1.05
shader_param/color_bleeding = 2.0
shader_param/bleeding_range_x = 2.0
shader_param/bleeding_range_y = 2.0
shader_param/lines_distance = 2.0
shader_param/scan_size = 8.0
shader_param/scanline_alpha = 0.9
shader_param/lines_velocity = 5.0
_sections_unfolded = [ "Resource", "shader_param" ]

[sub_resource type="Shader" id=9]

code = "shader_type canvas_item;

// source: http://docs.godotengine.org/en/3.0/tutorials/shading/screen-reading_shaders.html
// SHADER 1
/*
// results in an invisible object, because it just shows what lies behind
void fragment()
{
        COLOR = textureLod(SCREEN_TEXTURE, SCREEN_UV, 0.0);
}
*/

// SHADER 2
uniform float brightness = 1.0;
uniform float contrast = 1.0;
uniform float saturation = 1.0;

void fragment()
{
		// textureLod = Perform a 2D texture read at custom mipmap
        vec3 c = textureLod(SCREEN_TEXTURE, SCREEN_UV, 0.0).rgb;

        c.rgb = mix(vec3(0.0), c.rgb, brightness);
        c.rgb = mix(vec3(0.5), c.rgb, contrast);
        c.rgb = mix(vec3(dot(vec3(1.0), c.rgb)*0.33333), c.rgb, saturation);

        COLOR.rgb = c;
}"
_sections_unfolded = [ "Resource" ]

[sub_resource type="ShaderMaterial" id=10]

render_priority = 0
shader = SubResource( 9 )
shader_param/brightness = 0.0
shader_param/contrast = 0.0
shader_param/saturation = null
_sections_unfolded = [ "Resource", "shader_param" ]

[sub_resource type="Shader" id=11]

code = "shader_type spatial;
render_mode cull_disabled, diffuse_toon;

void vertex() {
	VERTEX.x += sin(TIME);
	VERTEX.y += cos(TIME);
}

void fragment() {
	ALBEDO.r = 1.0;
}

void light() {
	DIFFUSE_LIGHT = ALBEDO * ATTENUATION;
}"

[sub_resource type="ShaderMaterial" id=12]

render_priority = 0
shader = SubResource( 11 )

[node name="screen" type="Node" index="0"]

_sections_unfolded = [ "Anchor", "Grow Direction", "Margin", "Mouse", "Rect", "Size Flags" ]

[node name="chip8" parent="." index="0" instance=ExtResource( 1 )]

margin_right = 640.0
margin_bottom = 320.0
rect_min_size = Vector2( 640, 320 )
_sections_unfolded = [ "Anchor", "Grow Direction", "Margin", "Material", "Mouse", "Pause", "Rect", "Transform", "Visibility", "Z Index" ]
fgColor = Color( 0.266667, 0.764706, 0.129412, 1 )
bgColor = Color( 0.121569, 0.419608, 0.129412, 1 )
showFPS = false
randomRomAtStartup = true
useShader = true
showRomDescriptionOnLoad = false

[node name="Shaders" type="Control" parent="." index="1"]

anchor_left = 0.0
anchor_top = 0.0
anchor_right = 0.0
anchor_bottom = 0.0
margin_right = 640.0
margin_bottom = 355.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 0
mouse_default_cursor_shape = 0
size_flags_horizontal = 1
size_flags_vertical = 1
_sections_unfolded = [ "Anchor", "Grow Direction", "Margin", "Material", "Pause", "Rect", "Visibility" ]
__meta__ = {
"_edit_group_": true
}

[node name="Curvature" type="TextureRect" parent="Shaders" index="0"]

visible = false
material = SubResource( 2 )
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 0.0
anchor_bottom = 0.0
margin_right = 640.0
margin_bottom = 355.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 1
mouse_default_cursor_shape = 0
size_flags_horizontal = 1
size_flags_vertical = 1
texture = ExtResource( 2 )
expand = true
stretch_mode = 0
_sections_unfolded = [ "Focus", "Grow Direction", "Hint", "Margin", "Material", "Mouse", "Pause", "Rect", "Size Flags", "Theme", "Visibility" ]

[node name="ColorBleeding" type="TextureRect" parent="Shaders" index="1"]

visible = false
material = SubResource( 4 )
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 0.0
anchor_bottom = 0.0
margin_right = 640.0
margin_bottom = 355.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 1
mouse_default_cursor_shape = 0
size_flags_horizontal = 1
size_flags_vertical = 1
texture = ExtResource( 2 )
expand = true
stretch_mode = 0
_sections_unfolded = [ "Anchor", "Grow Direction", "Margin", "Material", "Pause", "Rect" ]

[node name="ScanLine" type="TextureRect" parent="Shaders" index="2"]

visible = false
material = SubResource( 6 )
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 0.0
anchor_bottom = 0.0
margin_right = 640.0
margin_bottom = 355.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 1
mouse_default_cursor_shape = 0
size_flags_horizontal = 1
size_flags_vertical = 1
texture = ExtResource( 2 )
expand = true
stretch_mode = 0
_sections_unfolded = [ "Focus", "Hint", "Material", "Rect" ]

[node name="CRT" type="TextureRect" parent="Shaders" index="3"]

material = SubResource( 8 )
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 0.0
anchor_bottom = 0.0
margin_right = 640.0
margin_bottom = 355.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 1
mouse_default_cursor_shape = 0
size_flags_horizontal = 3
size_flags_vertical = 3
texture = ExtResource( 2 )
expand = true
stretch_mode = 0
_sections_unfolded = [ "Anchor", "Grow Direction", "Margin", "Material", "Rect", "Size Flags", "Visibility" ]

[node name="ShaderTest" type="ColorRect" parent="Shaders" index="4"]

visible = false
material = ExtResource( 3 )
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 1.0
anchor_bottom = 1.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 1
mouse_default_cursor_shape = 0
size_flags_horizontal = 1
size_flags_vertical = 1
color = Color( 1, 1, 1, 1 )
_sections_unfolded = [ "Anchor", "Focus", "Grow Direction", "Hint", "Margin", "Material", "Mouse", "Rect", "Size Flags", "Theme", "Visibility" ]

[node name="ShaderTest2" type="ColorRect" parent="Shaders" index="5"]

visible = false
material = SubResource( 10 )
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 1.0
anchor_bottom = 1.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 1
mouse_default_cursor_shape = 0
size_flags_horizontal = 1
size_flags_vertical = 1
color = Color( 1, 1, 1, 1 )
_sections_unfolded = [ "Anchor", "Focus", "Grow Direction", "Hint", "Margin", "Material", "Mouse", "Rect", "Size Flags", "Theme", "Visibility" ]

[node name="ShaderTest3" type="ColorRect" parent="Shaders" index="6"]

visible = false
material = SubResource( 12 )
anchor_left = 0.0
anchor_top = 0.0
anchor_right = 1.0
anchor_bottom = 1.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 1
mouse_default_cursor_shape = 0
size_flags_horizontal = 1
size_flags_vertical = 1
color = Color( 1, 1, 1, 1 )
_sections_unfolded = [ "Anchor", "Focus", "Grow Direction", "Hint", "Margin", "Material", "Mouse", "Rect", "Size Flags", "Theme", "Visibility" ]

[node name="ui" parent="." index="2" instance=ExtResource( 4 )]

_sections_unfolded = [ "Anchor", "Focus", "Grow Direction", "Hint", "Margin", "Material", "Mouse", "Rect", "Visibility" ]

[node name="CRTFrame" type="TextureRect" parent="." index="3"]

anchor_left = 0.0
anchor_top = 0.0
anchor_right = 0.0
anchor_bottom = 0.0
margin_right = 640.0
margin_bottom = 355.0
rect_pivot_offset = Vector2( 0, 0 )
rect_clip_content = false
mouse_filter = 2
mouse_default_cursor_shape = 0
size_flags_horizontal = 3
size_flags_vertical = 3
texture = ExtResource( 5 )
expand = true
stretch_mode = 0
_sections_unfolded = [ "Anchor", "Focus", "Hint", "Margin", "Material", "Mouse", "Rect", "Size Flags", "Theme", "Visibility" ]