temporal effects

shaders/temporal-ghost-trail/shader.json

@@ -0,0 +1,32 @@
+{
+  "id": "temporal-ghost-trail",
+  "name": "Temporal Ghost Trail",
+  "description": "Blends older pre-layer input frames into the current layer input for a soft temporal trail.",
+  "category": "Built-in",
+  "entryPoint": "shadeVideo",
+  "temporal": {
+    "enabled": true,
+    "historySource": "preLayerInput",
+    "historyLength": 12
+  },
+  "parameters": [
+    {
+      "id": "currentMix",
+      "label": "Current Mix",
+      "type": "float",
+      "default": 0.72,
+      "min": 0.0,
+      "max": 1.0,
+      "step": 0.01
+    },
+    {
+      "id": "trailMix",
+      "label": "Trail Mix",
+      "type": "float",
+      "default": 0.28,
+      "min": 0.0,
+      "max": 1.0,
+      "step": 0.01
+    }
+  ]
+}

shaders/temporal-ghost-trail/shader.slang

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+float4 shadeVideo(ShaderContext context)
+{
+	float4 history0 = sampleTemporalHistory(1, context.uv);
+	float4 history1 = sampleTemporalHistory(3, context.uv);
+	float4 history2 = sampleTemporalHistory(5, context.uv);
+	float4 trail = history0 * 0.5 + history1 * 0.3 + history2 * 0.2;
+	float trailAmount = clamp(trailMix, 0.0, 1.0);
+	float currentAmount = clamp(currentMix, 0.0, 1.0);
+	float weightSum = max(0.0001, currentAmount + trailAmount);
+	return saturate((context.sourceColor * currentAmount + trail * trailAmount) / weightSum);
+}