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Merged
hiulit merged 2 commits into from
Jul 18, 2019
Merged

Screen texture and scan lines are now affected by curvature #1

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eb1cbff
Screen texture and scan lines are now affected by curvature
CowThing Jul 16, 2019
fe47468
Added uniform to change CRT screen size
CowThing Jul 16, 2019
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6 changes: 3 additions & 3 deletions crt_material.tres
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Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,11 @@

[resource]
shader = ExtResource( 1 )
shader_param/blend_color = Color( 1, 1, 1, 1 )
shader_param/boost = 1.2
shader_param/vignette_opacity = 0.35
shader_param/vignette_opacity = 0.3
shader_param/scanline_speed = 1.0
shader_param/show_grille = true
shader_param/show_scanlines = true
shader_param/show_vignette = true
shader_param/show_curvature = true

shader_param/screen_size = Vector2( 320, 180 )
50 changes: 26 additions & 24 deletions crt_shader.shader
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Original file line number Diff line number Diff line change
@@ -1,13 +1,14 @@
shader_type canvas_item;
render_mode blend_mul;
render_mode blend_mix;

uniform vec4 blend_color : hint_color = vec4(1.0, 1.0, 1.0, 1.0);
uniform float boost : hint_range(1.0, 1.5, 0.05) = float(1.2);
uniform float vignette_opacity : hint_range(0.1, 0.5, 0.05) = float(0.3);
uniform float boost : hint_range(1.0, 1.5, 0.01) = float(1.2);
uniform float vignette_opacity : hint_range(0.1, 0.5, 0.01) = float(0.3);
uniform float scanline_speed : hint_range(0.0, 1.0, 0.01) = float(1.0);
uniform bool show_grille = true; // Grille only works in Stretch Mode: 2D.
uniform bool show_scanlines = true;
uniform bool show_vignette = true;
uniform bool show_curvature = true;
uniform vec2 screen_size = vec2(480.0, 270.0);

vec2 CRTCurveUV(vec2 uv) {
if(show_curvature) {
Expand All @@ -19,7 +20,7 @@ vec2 CRTCurveUV(vec2 uv) {
return uv;
}

void DrawVignette(inout vec4 color, vec2 uv) {
void DrawVignette(inout vec3 color, vec2 uv) {
if(show_vignette) {
float vignette = uv.x * uv.y * (1.0 - uv.x) * (1.0 - uv.y);
vignette = clamp(pow(16.0 * vignette, vignette_opacity), 0.0, 1.0);
Expand All @@ -29,31 +30,32 @@ void DrawVignette(inout vec4 color, vec2 uv) {
}
}

void DrawScanline(inout vec4 color, vec2 uv, float time) {
float scanline = clamp(0.95 + 0.05 * cos(3.14 * (uv.y + 0.008 * time) * 240.0 * 1.0), 0.0, 1.0);
float grille = 0.85 + 0.15 * clamp(1.5 * cos(3.14 * uv.x * 640.0 * 1.0), 0.0, 1.0);

if(show_scanlines && !show_grille) {
color *= scanline * boost;
} else if(!show_scanlines && show_grille) {
color *= grille * boost;
} else if(show_scanlines && show_grille) {
color *= scanline * grille * boost;
} else {
color *= boost;
void DrawScanline(inout vec3 color, vec2 uv, float time) {
float scanline = clamp(0.95 + 0.05 * sin(3.14159 * (uv.y + 0.008 * time) * screen_size.y), 0.0, 1.0);
float grille = 0.85 + 0.15 * clamp(1.5 * sin(3.14159 * uv.x * screen_size.x), 0.0, 1.0);

if(show_scanlines) {
color *= scanline
}

if(show_grille) {
color *= grille
}

color *= boost;
}

void fragment() {
vec4 color = blend_color;

vec2 screen_crtUV = CRTCurveUV(SCREEN_UV);
vec3 color = texture(SCREEN_TEXTURE, screen_crtUV).rgb;

vec2 crtUV = CRTCurveUV(UV);
if (crtUV.x < 0.0 || crtUV.x > 1.0 || crtUV.y < 0.0 || crtUV.y > 1.0) {
color = vec4(0.0, 0.0, 0.0, 1.0);
color = vec3(0.0, 0.0, 0.0);
}

DrawVignette(color, crtUV);
DrawScanline(color, UV, TIME);

COLOR = vec4(color);
DrawScanline(color, crtUV, TIME * scanline_speed);
COLOR = vec4(color, 1.0);
}
8 changes: 6 additions & 2 deletions demo_scene.tscn
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Original file line number Diff line number Diff line change
Expand Up @@ -8,13 +8,17 @@
[node name="background" type="ColorRect" parent="."]
anchor_right = 1.0
anchor_bottom = 1.0
color = Color( 0.8, 0.74902, 0.501961, 1 )

[node name="icon" type="Sprite" parent="."]
position = Vector2( 153.033, 91.1485 )
position = Vector2( 71.3842, 70.2482 )
texture = ExtResource( 1 )

[node name="icon2" type="Sprite" parent="."]
position = Vector2( 246.99, 107.356 )
texture = ExtResource( 1 )

[node name="CRTShader" type="ColorRect" parent="."]
material = ExtResource( 2 )
anchor_right = 1.0
anchor_bottom = 1.0