🚚 Rename shader files

2022-05-27 21:21:05 +02:00
parent c90f3a1c97
commit 6a65d59144
13 changed files with 2 additions and 2 deletions
@@ -0,0 +1,125 @@
+//////////////////////////////////////////////////////////////////////////////////////////
+//          )                                                   (                       //
+//       ( /(   (  (               )    (       (  (  (         )\ )    (  (            //
+//       )\()) ))\ )(   (         (     )\ )    )\))( )\  (    (()/( (  )\))(  (        //
+//      ((_)\ /((_|()\  )\ )      )\  '(()/(   ((_)()((_) )\ )  ((_)))\((_)()\ )\       //
+//      | |(_|_))( ((_)_(_/(    _((_))  )(_))  _(()((_|_)_(_/(  _| |((_)(()((_|(_)      //
+//      | '_ \ || | '_| ' \))  | '  \()| || |  \ V  V / | ' \)) _` / _ \ 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 bool uAdditiveBlending;
+uniform vec2 uSeed;
+uniform float uScale;
+uniform float uLineWidth;
+uniform vec4 uGlowColor;
+uniform vec4 uLineColor;
+
+// This methods generates a procedural hexagonal pattern. It returns four values:
+// result.xy: This contains cell-relative coordinates for the given point.
+//            [0, 0] is in the center of a cell, [0, 1] at the upper edge,
+//            [sqrt(4.0 / 3.0), 0] at the right tip and so on.
+// result.z:  This is the distance to the closest edge. This is used for shrinking
+//            of the tiles and the sharp overlay lines.
+// result.w:  This is the distance to the closest cell center. This is used for
+//            the glow effect.
+vec4 getHexagons(vec2 p) {
+
+  // Length of a cell's edge.
+  const float edgeLength = sqrt(4.0 / 3.0);
+
+  // The hexgrid repeats after this distance.
+  const vec2 scale = vec2(3.0 * edgeLength, 2.0);
+
+  // This is a repeating grid of scale-sized cells. Y-values are in the
+  // interval [-1...1], X-value in [-1.5*edgeLength...1.5*edgeLength].
+  vec2 a    = mod(p, scale) - scale * 0.5;
+  vec2 aAbs = abs(a);
+
+  // This is the same as above, but offset by half scale.
+  vec2 b    = mod(p + scale * 0.5, scale) - scale * 0.5;
+  vec2 bAbs = abs(b);
+
+  // Distance to closer edge, diagonally or horizontally.
+  // Once for cell set A and once for cell set B.
+  float distA = max(aAbs.x / edgeLength + aAbs.y * 0.5, aAbs.y);
+  float distB = max(bAbs.x / edgeLength + bAbs.y * 0.5, bAbs.y);
+
+  // Minimum of both is distance to closest edge.
+  float dist = 1.0 - min(distA, distB);
+
+  // We use the radial distance to the center for glow.
+  float glow = min(dot(a, a), dot(b, b)) / 1.5;
+
+  // Take cell-relative coordinates from the closer cell.
+  vec2 cellCoords = distA < distB ? a : b;
+
+  return vec4(cellCoords, dist, glow);
+}
+
+void main() {
+  // We simply inverse the progress for opening windows.
+  float progress = uForOpening ? 1.0 - uProgress : uProgress;
+
+  // Add some smooth noise to the progress so that not every tile behaves the
+  // same.
+  float noise = simplex2D(cogl_tex_coord_in[0].st + uSeed);
+  progress    = clamp(mix(noise - 1.0, noise + 1.0, progress), 0.0, 1.0);
+
+  // glowProgress fades in in the first half of the animation, tileProgress fades
+  // in in the second half.
+  float glowProgress = smoothstep(0, 1, clamp(progress / 0.5, 0, 1));
+  float tileProgress = smoothstep(0, 1, clamp((progress - 0.5) / 0.5, 0, 1));
+
+  vec2 texScale = 0.1 * uSize / uScale;
+  vec4 hex      = getHexagons(cogl_tex_coord_in[0].st * texScale);
+
+  if (tileProgress > hex.z) {
+
+    // Crop outer parts of the shrinking tiles.
+    cogl_color_out.a = 0.0;
+
+  } else {
+
+    // Make the tiles shrink by offsetting the texture lookup towards the edge
+    // of the cell.
+    vec2 lookupOffset = tileProgress * hex.xy / texScale / (1.0 - tileProgress);
+    cogl_color_out    = texture2D(uTexture, cogl_tex_coord_in[0].st + lookupOffset);
+
+    // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
+    if (cogl_color_out.a > 0) {
+      cogl_color_out.rgb /= cogl_color_out.a;
+    }
+
+    vec4 glow = uGlowColor;
+    vec4 line = uLineColor;
+
+    // For the glow, we accumulate a few exponentially scaled versions of hex.w.
+    glow.a *= pow(hex.w, 20.0) * 10.0 + pow(hex.w, 10.0) * 5.0 + pow(hex.w, 2.0) * 0.5;
+
+    // Using step(uLineWidth, hex.z) would be simpler, but the below creates some
+    // fake antialiasing.
+    line.a *= 1.0 - smoothstep(uLineWidth * 0.02 * 0.5, uLineWidth * 0.02, hex.z);
+
+    // Fade in the glowing lines.
+    glow.a *= glowProgress;
+    line.a *= glowProgress;
+
+    // Do not add the hexagon lines onto transparent parts of the window.
+    glow *= cogl_color_out.a;
+    line *= cogl_color_out.a;
+
+    if (uAdditiveBlending) {
+      cogl_color_out.rgb += glow.rgb * glow.a;
+      cogl_color_out.rgb += line.rgb * line.a;
+    } else {
+      cogl_color_out.rgb = mix(cogl_color_out.rgb, glow.rgb, glow.a);
+      cogl_color_out.rgb = mix(cogl_color_out.rgb, line.rgb, line.a);
+    }
+  }
+}