🪲 allow glitch to distort the left side of the window

Schneegans · Jan 24, 2023 · 67885c7 · 67885c7
1 parent 7ab0781
commit 67885c7
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Showing 2 changed files with 5 additions and 5 deletions.
diff --git a/resources/shaders/glitch.frag b/resources/shaders/glitch.frag
@@ -29,11 +29,11 @@ void main() {
   float yPos     = uScale * uSize.y * (iTexCoord.y + uSeed * 10.0);
 
   // Create large noise waves and add some smaller noise waves.
-  float noise = clamp(simplex2D(vec2(time, yPos * 0.002)) - 0.5, 0.0, 1.0);
+  float noise = clamp(simplex2D(vec2(time, yPos * 0.002)) - 0.5, -1.0, 1.0);
   noise += (simplex2D(vec2(time * 10.0, yPos * 0.05)) - 0.5) * 0.15;
 
   // Apply the noise as x displacement for every line.
-  float xPos  = clamp(iTexCoord.x - displace * noise * noise, 0.0, 1.0);
+  float xPos  = clamp(iTexCoord.x - displace * noise * noise * sign(noise), -1.0, 1.0);
   vec4 oColor = getInputColor(vec2(xPos, iTexCoord.y));
 
   // Mix in some random interference lines.
@@ -62,4 +62,4 @@ void main() {
   oColor.a *= alpha;
 
   setOutputColor(oColor);
-}
+}
diff --git a/resources/shaders/tv-glitch.frag b/resources/shaders/tv-glitch.frag
@@ -49,11 +49,11 @@ void main() {
   float yPos     = uScale * uSize.y * (coords.y + uSeed * 10.0);
 
   // Create large noise waves and add some smaller noise waves.
-  float noise = clamp(simplex2D(vec2(time, yPos * 0.002)) - 0.5, 0.0, 1.0);
+  float noise = clamp(simplex2D(vec2(time, yPos * 0.002)) - 0.5, -1.0, 1.0);
   noise += (simplex2D(vec2(time * 10.0, yPos * 0.05)) - 0.5) * 0.15;
 
   // Apply the noise as x displacement for every line.
-  float xPos  = clamp(coords.x - displace * noise * noise, 0.0, 1.0);
+  float xPos  = clamp(coords.x - displace * noise * noise * sign(noise), -1.0, 1.0);
   vec4 oColor = getInputColor(vec2(xPos, coords.y));
 
   // Mix in some random interference lines.