🎉 Add doom effect

2022-08-27 16:08:01 +02:00
parent 1a50499f61
commit 9a63fdeb9d
9 changed files with 654 additions and 1 deletions
@@ -0,0 +1,42 @@
+//////////////////////////////////////////////////////////////////////////////////////////
+//          )                                                   (                       //
+//       ( /(   (  (               )    (       (  (  (         )\ )    (  (            //
+//       )\()) ))\ )(   (         (     )\ )    )\))( )\  (    (()/( (  )\))(  (        //
+//      ((_)\ /((_|()\  )\ )      )\  '(()/(   ((_)()((_) )\ )  ((_)))\((_)()\ )\       //
+//      | |(_|_))( ((_)_(_/(    _((_))  )(_))  _(()((_|_)_(_/(  _| |((_)(()((_|(_)      //
+//      | '_ \ || | '_| ' \))  | '  \()| || |  \ V  V / | ' \)) _` / _ \ V  V (_-<      //
+//      |_.__/\_,_|_| |_||_|   |_|_|_|  \_, |   \_/\_/|_|_||_|\__,_\___/\_/\_//__/      //
+//                                 |__/                                                 //
+//                       Copyright (c) 2021 Simon Schneegans                            //
+//          Released under the GPLv3 or later. See LICENSE file for details.            //
+//////////////////////////////////////////////////////////////////////////////////////////
+
+// The content from common.glsl is automatically prepended to each shader effect.
+
+uniform float uActorScale;
+uniform float uHorizontalScale;
+uniform float uVerticalScale;
+uniform float uPixelSize;
+
+void main() {
+
+  float pixelSize = ceil(uPixelSize * uProgress + 1.0);
+  vec2 pixelGrid  = vec2(pixelSize) / uSize;
+
+  vec2 texcoord = iTexCoord.st;
+  texcoord.y    = texcoord.y * uActorScale + 0.5 - uActorScale * 0.5;
+  texcoord -= mod(iTexCoord.st, pixelGrid);
+  texcoord += pixelGrid * 0.5;
+
+  float hScale = uHorizontalScale * uSize.x * 0.001;
+  float vScale = uVerticalScale * uSize.y * 0.0001;
+  float shift  = max(simplex2DFractal(texcoord.xx * hScale) * vScale +
+                      (1.0 + vScale * 0.8) * uProgress - 0.8 * vScale,
+                    0.0);
+
+  texcoord.y -= uActorScale * shift;
+
+  vec4 oColor = getInputColor(texcoord);
+
+  setOutputColor(oColor);
+}