🔧 Use new global methods for shader I/O

resources/shaders/apparition.frag

@@ -48,12 +48,8 @@ void main() {
   float c     = cos(angle);
   coords      = vec2(dot(coords, vec2(c, -s)), dot(coords, vec2(s, c)));
 
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  oColor = texture2D(uTexture, coords + center);
-  if (oColor.a > 0) {
-    oColor.rgb /= oColor.a;
-  }
-
   // Fade out the window texture.
+  vec4 oColor = getInputColor(coords + center);
   oColor.a *= 1.0 - progress;
+  setOutputColor(oColor);
 }

resources/shaders/broken-glass.frag

@@ -25,7 +25,7 @@ const float ACTOR_SCALE  = 2.0;
 const float PADDING      = ACTOR_SCALE / 2.0 - 0.5;
 
 void main() {
-  oColor = vec4(0, 0, 0, 0);
+  vec4 oColor = vec4(0, 0, 0, 0);
 
   float progress = uForOpening ? 1.0 - uProgress : uProgress;
 
@@ -66,12 +66,9 @@ void main() {
     float shardGroup = floor(shardMap.g * SHARD_LAYERS * 0.999);
 
     if (shardGroup == i && (shardMap.x - pow(progress + 0.1, 2)) > 0) {
-      oColor = texture2D(uTexture, coords);
+      oColor = getInputColor(coords);
     }
   }
 
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  if (oColor.a > 0) {
-    oColor.rgb /= oColor.a;
-  }
+  setOutputColor(oColor);
 }

resources/shaders/common.glsl

@@ -106,7 +106,7 @@ uniform float uTime;
 uniform vec2 uSize;
 uniform float uPadding;
 
-// On GNOME, we set iTexCoord and oColor to be aliases for the cogl variables.
+// On GNOME, we set iTexCoord to be an alias for the cogl variables.
 #define iTexCoord cogl_tex_coord_in[0]
 
 // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.

resources/shaders/energize-a.frag

@@ -59,17 +59,12 @@ vec2 getMasks(float progress) {
 void main() {
   float progress = easeOutQuad(uProgress);
 
-  vec2 masks       = getMasks(progress);
-  vec4 windowColor = texture2D(uTexture, iTexCoord.st);
-
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  if (windowColor.a > 0) {
-    windowColor.rgb /= windowColor.a;
-  }
+  vec2 masks  = getMasks(progress);
+  vec4 oColor = getInputColor(iTexCoord.st);
 
   // Dissolve window to effect color / transparency.
-  oColor.rgb = mix(uColor, windowColor.rgb, 0.2 * masks.y + 0.8);
-  oColor.a   = windowColor.a * masks.y;
+  oColor.rgb = mix(uColor, oColor.rgb, 0.2 * masks.y + 0.8);
+  oColor.a   = oColor.a * masks.y;
 
   vec2 scaledUV = (iTexCoord.st - 0.5) * (1.0 + 0.1 * progress);
   scaledUV /= uScale;
@@ -94,4 +89,6 @@ void main() {
   // oColor = vec4(vec3(masks.x), 1.0);
   // oColor = vec4(vec3(masks.y), 1.0);
   // oColor = vec4(vec3(particles), 1.0);
+
+  setOutputColor(oColor);
 }

resources/shaders/energize-b.frag

@@ -76,17 +76,12 @@ vec4 getMasks(float progress) {
 void main() {
   float progress = easeOutQuad(uProgress);
 
-  vec4 masks       = getMasks(progress);
-  vec4 windowColor = texture2D(uTexture, iTexCoord.st);
-
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  if (windowColor.a > 0) {
-    windowColor.rgb /= windowColor.a;
-  }
+  vec4 masks  = getMasks(progress);
+  vec4 oColor = getInputColor(iTexCoord.st);
 
   // Dissolve window to effect color / transparency.
-  oColor.rgb = mix(uColor, windowColor.rgb, 0.5 * masks.w + 0.5);
-  oColor.a   = windowColor.a * masks.w;
+  oColor.rgb = mix(uColor, oColor.rgb, 0.5 * masks.w + 0.5);
+  oColor.a   = oColor.a * masks.w;
 
   // Add leading shower particles.
   vec2 showerUV = iTexCoord.st + vec2(0, -0.7 * progress / SHOWER_TIME);
@@ -118,4 +113,6 @@ void main() {
   // oColor = vec4(vec3(shower), 1.0);
   // oColor = vec4(vec3(streaks), 1.0);
   // oColor = vec4(vec3(atoms), 1.0);
+
+  setOutputColor(oColor);
 }

resources/shaders/fire.frag

@@ -103,12 +103,7 @@ void main() {
   vec4 fire = getFireColor(noise);
 
   // Get the window texture.
-  oColor = texture2D(uTexture, iTexCoord.st);
-
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  if (oColor.a > 0) {
-    oColor.rgb /= oColor.a;
-  }
+  vec4 oColor = getInputColor(iTexCoord.st);
 
   // Fade the window according to the effect mask.
   oColor.a *= effectMask.x;
@@ -120,4 +115,6 @@ void main() {
   // oColor = vec4(vec3(noise), 1);
   // oColor = vec4(vec3(effectMask.x), 1);
   // oColor = vec4(vec3(effectMask.y), 1);
+
+  setOutputColor(oColor);
 }

resources/shaders/hexagon.frag

@@ -79,22 +79,15 @@ void main() {
   vec2 texScale = 0.1 * uSize / uScale;
   vec4 hex      = getHexagons(iTexCoord.st * texScale);
 
-  if (tileProgress > hex.z) {
+  vec4 oColor = vec4(0.0);
 
-    // Crop outer parts of the shrinking tiles.
-    oColor.a = 0.0;
-
-  } else {
+  // Crop outer parts of the shrinking tiles.
+  if (tileProgress < hex.z) {
 
     // Make the tiles shrink by offsetting the texture lookup towards the edge
     // of the cell.
     vec2 lookupOffset = tileProgress * hex.xy / texScale / (1.0 - tileProgress);
-    oColor            = texture2D(uTexture, iTexCoord.st + lookupOffset);
-
-    // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-    if (oColor.a > 0) {
-      oColor.rgb /= oColor.a;
-    }
+    oColor            = getInputColor(iTexCoord.st + lookupOffset);
 
     vec4 glow = uGlowColor;
     vec4 line = uLineColor;
@@ -122,4 +115,6 @@ void main() {
       oColor.rgb = mix(oColor.rgb, line.rgb, line.a);
     }
   }
+
+  setOutputColor(oColor);
 }

resources/shaders/matrix.frag

@@ -83,12 +83,7 @@ void main() {
   float textMask = getText(coords);
 
   // Get the window texture.
-  oColor = texture2D(uTexture, coords);
-
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  if (oColor.a > 0) {
-    oColor.rgb /= oColor.a;
-  }
+  vec4 oColor = getInputColor(coords);
 
   // Fade the window according to the effect mask.
   oColor.a *= rainMask.y;
@@ -107,4 +102,6 @@ void main() {
   // oColor = vec4(vec3(textMask), 1);
   // oColor = vec4(vec3(rainMask.x), 1);
   // oColor = vec4(vec3(rainMask.y), 1);
+
+  setOutputColor(oColor);
 }

resources/shaders/snap.frag

@@ -34,11 +34,7 @@ void main() {
   progress       = progress + 0.25 - 0.5 * simplex2D((iTexCoord.st + uSeed) * 2.0);
   progress       = pow(max(0, progress), 2.0);
 
-  // This may help you to understand how this effect works.
-  // oColor = vec4(progress, 0, 0, 0);
-  // return;
-
-  oColor = vec4(0, 0, 0, 0);
+  vec4 oColor = vec4(0.0);
 
   for (float i = 0; i < DUST_LAYERS; ++i) {
 
@@ -80,12 +76,7 @@ void main() {
     if (dustGroup == i) {
 
       // Get the window color.
-      vec4 windowColor = texture2D(uTexture, coords + 0.5);
-
-      // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-      if (windowColor.a > 0) {
-        windowColor.rgb /= windowColor.a;
-      }
+      vec4 windowColor = getInputColor(coords + 0.5);
 
       // Fade the window color to uDustColor.
       vec3 dustColor  = mix(windowColor.rgb, uDustColor.rgb, uDustColor.a);
@@ -97,4 +88,9 @@ void main() {
       }
     }
   }
+
+  // This may help you to understand how this effect works.
+  // oColor = vec4(progress, 0, 0, 0);
+
+  setOutputColor(oColor);
 }

resources/shaders/trex.frag

@@ -90,12 +90,7 @@ void main() {
   // Get the window texture. We shift the texture lookup by the local derivative of
   // the claw texture in order to mimic some folding distortion.
   vec2 offset = vec2(dFdx(scratchMap), dFdy(scratchMap)) * progress * 0.5;
-  oColor      = texture2D(uTexture, coords + offset);
-
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  if (oColor.a > 0) {
-    oColor.rgb /= oColor.a;
-  }
+  vec4 oColor = getInputColor(coords + offset);
 
   // Add colorful flashes.
   float flashIntensity = 1.0 / FLASH_INTENSITY * (scratchMap - progress) + 1;
@@ -120,4 +115,6 @@ void main() {
   // These are pretty useful for understanding how this works.
   // oColor = vec4(vec3(flashIntensity), 1);
   // oColor = vec4(vec3(scratchMap), 1);
+
+  setOutputColor(oColor);
 }

resources/shaders/wisps.frag

@@ -71,12 +71,7 @@ void main() {
   vec2 coords = iTexCoord.st * (scale + 1.0) - scale * 0.5;
 
   // Get the color of the window.
-  oColor = texture2D(uTexture, coords);
-
-  // Shell.GLSLEffect uses straight alpha. So we have to convert from premultiplied.
-  if (oColor.a > 0) {
-    oColor.rgb /= oColor.a;
-  }
+  vec4 oColor = getInputColor(coords);
 
   // Compute several layers of moving wisps.
   vec2 uv = (iTexCoord.st - 0.5) / mix(1.0, 0.5, progress) + 0.5;
@@ -110,4 +105,6 @@ void main() {
   // oColor = vec4(vec3(wisps), 1.0);
   // oColor = vec4(vec3(noise), 1.0);
   // oColor = vec4(vec3(mask*min(wispsIn, 1.0 - wispsOut)), 1.0);
+
+  setOutputColor(oColor);
 }