temporal effects

shaders/temporal-low-fps/shader.json

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+{
+  "id": "temporal-low-fps",
+  "name": "Temporal Low FPS",
+  "description": "Holds older source frames to create a deliberate choppy playback look.",
+  "category": "Built-in",
+  "entryPoint": "shadeVideo",
+  "temporal": {
+    "enabled": true,
+    "historySource": "source",
+    "historyLength": 8
+  },
+  "parameters": [
+    {
+      "id": "holdFrames",
+      "label": "Hold Frames",
+      "type": "float",
+      "default": 3.0,
+      "min": 0.0,
+      "max": 7.0,
+      "step": 0.1
+    },
+    {
+      "id": "blendAmount",
+      "label": "Blend",
+      "type": "float",
+      "default": 1.0,
+      "min": 0.0,
+      "max": 1.0,
+      "step": 0.01
+    }
+  ]
+}

shaders/temporal-low-fps/shader.slang

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+float4 shadeVideo(ShaderContext context)
+{
+	float clampedHoldFrames = clamp(holdFrames, 0.0, 7.0);
+	int lowerHoldLength = int(floor(clampedHoldFrames)) + 1;
+	int upperHoldLength = min(lowerHoldLength + 1, 8);
+	float fractional = frac(clampedHoldFrames);
+
+	int lowerPhase = int(context.frameCount) % lowerHoldLength;
+	int upperPhase = int(context.frameCount) % upperHoldLength;
+
+	float4 lowerHeld = lowerPhase == 0 ? context.sourceColor : sampleSourceHistory(lowerPhase - 1, context.uv);
+	float4 upperHeld = upperPhase == 0 ? context.sourceColor : sampleSourceHistory(upperPhase - 1, context.uv);
+	float4 held = lerp(lowerHeld, upperHeld, fractional);
+	return lerp(context.sourceColor, held, clamp(blendAmount, 0.0, 1.0));
+}