🔧 Tweak effect

schemas/org.gnome.shell.extensions.burn-my-windows.gschema.xml

@@ -332,7 +332,7 @@
     </key>
 
     <key name="snap-scale" type="d">
-      <default>1.0</default>
+      <default>1.5</default>
       <summary>Snap Scale</summary>
       <description>The size of the snap effect.</description>
     </key>

src/SnapOfDisintegration.js

@@ -86,9 +86,9 @@ var SnapOfDisintegration = class SnapOfDisintegration {
   // we have some space to draw the dust.
   static getCloseTransition(actor, settings) {
     return {
-      'opacity': {to: 255},
+      'opacity': {to: 255, mode: 14},             // Mode:  EASE_IN_SINE
-      'scale-x': {from: 2.0, to: 2.0},
+      'scale-x': {from: 2.0, to: 2.0, mode: 14},  // Mode:  EASE_IN_SINE
-      'scale-y': {from: 2.0, to: 2.0}
+      'scale-y': {from: 2.0, to: 2.0, mode: 14}   // Mode:  EASE_IN_SINE
     };
   }
 }
@@ -123,6 +123,7 @@ if (utils.isInShellProcess()) {
 
         // Inject some common shader snippets.
         ${shaderSnippets.standardUniforms()}
+        ${shaderSnippets.math2D()}
 
         uniform sampler2D uDustTexture;
 
@@ -147,10 +148,21 @@ if (utils.isInShellProcess()) {
 
             vec2 coords = cogl_tex_coord_in[0].st * ACTOR_SCALE - PADDING;
             
-            vec2 distort = vec2(cos(progress * (i+1) + coords.y * (i+1)) * 0.05 - sin(progress) * 0.1, -progress*mix(0.3, 0.5, factor));
+            float angle = 23.123 * SEED.x + mix(0.0, 0.2, factor);
-            coords += distort * progress;
+            vec2 direction = vec2(1.0, 0.0);
+            direction = rotate(direction, angle);
 
-            vec2 dustCoords = (coords + SEED) * vec2(uSizeX, uSizeY) * DUST_SCALE / 100.0;
+            float dist = distToLine(vec2(0.5), direction, coords);
+            
+            vec2 distort = direction * dist * dist * uProgress * uProgress;
+
+            if (getWinding(direction, coords - 0.5) > 0) {
+              distort *= -1;
+            }
+
+            coords = coords + distort;
+         
+            vec2 dustCoords = (coords + SEED) * vec2(uSizeX, uSizeY) / DUST_SCALE / 100.0;
             vec2 dustMap = texture2D(uDustTexture, dustCoords).rg;
 
             float dustGroup = floor(dustMap.g * DUST_LAYERS * 0.999);
@@ -158,8 +170,11 @@ if (utils.isInShellProcess()) {
             if (dustGroup == i) {
               vec4 windowColor = texture2D(uTexture, coords);
               windowColor.rgb = mix(windowColor.rgb, DUST_COLOR*windowColor.a, progress);
-              float dissolve = (dustMap.x - pow(progress, 5)) > 0 ? 1: 0;
+              float dissolve = (dustMap.x - progress) > 0 ? 1: 0;
-              cogl_color_out = mix(cogl_color_out, windowColor, dissolve);
+
+              windowColor *= dissolve;
+
+              cogl_color_out = mix(cogl_color_out, windowColor, windowColor.a);
             }
           }
         }

src/shaderSnippets.js

@@ -33,6 +33,24 @@ function standardUniforms() {
   `;
 }
 
+function math2D() {
+  return `
+  float distToLine(vec2 origin, vec2 direction, vec2 point) {
+    vec2 perpendicular = vec2(direction.y, -direction.x);
+    return abs(dot(normalize(perpendicular), origin - point));
+  }
+
+  float getWinding(vec2 a, vec2 b) {
+    return cross(vec3(a, 0.0), vec3(b, 0.0)).z;
+  }
+
+  vec2 rotate(vec2 a, float angle) {
+    return vec2(a.x * cos(angle) - a.y * sin(angle),
+                a.x * sin(angle) + a.y * cos(angle));
+  }
+  `;
+}
+
 // This method returns a mask which smoothly transitions towards zero when approaching
 // the window's borders. There is a variant which takes the transition area width in
 // pixels and one which takes this as a percentage.