Added trigger

shaders/trigger-ripple/shader.json

@@ -0,0 +1,59 @@
+{
+  "id": "trigger-ripple",
+  "name": "Trigger Ripple",
+  "description": "A water-drop style ripple that expands across the video whenever the trigger is pressed.",
+  "category": "Utility",
+  "entryPoint": "shadeVideo",
+  "parameters": [
+    {
+      "id": "drop",
+      "label": "Drop",
+      "type": "trigger"
+    },
+    {
+      "id": "center",
+      "label": "Center",
+      "type": "vec2",
+      "default": [0.5, 0.5],
+      "min": [0.0, 0.0],
+      "max": [1.0, 1.0],
+      "step": [0.01, 0.01]
+    },
+    {
+      "id": "strength",
+      "label": "Strength",
+      "type": "float",
+      "default": 0.12,
+      "min": 0.0,
+      "max": 0.3,
+      "step": 0.001
+    },
+    {
+      "id": "speed",
+      "label": "Duration",
+      "type": "float",
+      "default": 0.3,
+      "min": 0.3,
+      "max": 5.0,
+      "step": 0.01
+    },
+    {
+      "id": "width",
+      "label": "Wave Width",
+      "type": "float",
+      "default": 0.09,
+      "min": 0.01,
+      "max": 0.25,
+      "step": 0.001
+    },
+    {
+      "id": "damping",
+      "label": "Damping",
+      "type": "float",
+      "default": 0.25,
+      "min": 0.05,
+      "max": 3.0,
+      "step": 0.05
+    }
+  ]
+}

shaders/trigger-ripple/shader.slang

@@ -0,0 +1,34 @@
+float4 shadeVideo(ShaderContext context)
+{
+    if (drop <= 0)
+        return context.sourceColor;
+
+    float age = max(context.time - dropTime, 0.0);
+    float2 aspect = float2(context.outputResolution.x / max(context.outputResolution.y, 1.0), 1.0);
+    float2 fromDrop = (context.uv - center) * aspect;
+    float radius = length(fromDrop);
+
+    float2 c0 = (float2(0.0, 0.0) - center) * aspect;
+    float2 c1 = (float2(1.0, 0.0) - center) * aspect;
+    float2 c2 = (float2(0.0, 1.0) - center) * aspect;
+    float2 c3 = (float2(1.0, 1.0) - center) * aspect;
+    float maxRadius = max(max(length(c0), length(c1)), max(length(c2), length(c3)));
+    float progress = saturate(age / max(speed, 0.001));
+    float waveRadius = progress * maxRadius;
+    float distanceToWave = radius - waveRadius;
+    float waveWidth = max(width * maxRadius, 0.0001);
+    float ring = (1.0 - smoothstep(waveWidth, waveWidth * 1.65, abs(distanceToWave))) * exp(-progress * damping * 0.35);
+    float crest = 1.0 - smoothstep(0.0, waveWidth * 0.35, abs(distanceToWave));
+    float ripple = ring * (distanceToWave >= 0.0 ? 1.0 : -0.55);
+
+    float2 direction = radius > 0.0001 ? fromDrop / radius : float2(0.0, 0.0);
+    float2 uvOffset = direction * (ripple * strength);
+    uvOffset.x /= aspect.x;
+
+    float2 refractedUv = clamp(context.uv - uvOffset, float2(0.0, 0.0), float2(1.0, 1.0));
+    float4 refracted = sampleVideo(refractedUv);
+
+    float highlight = saturate(ring * 0.75 + crest * 0.55);
+    refracted.rgb += highlight * 0.075;
+    return saturate(refracted);
+}