diff --git a/shaders/greenscreen-key/shader.json b/shaders/greenscreen-key/shader.json
new file mode 100644
index 0000000..500211f
--- /dev/null
+++ b/shaders/greenscreen-key/shader.json
@@ -0,0 +1,90 @@
+{
+  "id": "greenscreen-key",
+  "name": "Greenscreen Key",
+  "description": "Keys out a green screen background and outputs transparent alpha for compositing.",
+  "category": "Built-in",
+  "entryPoint": "shadeVideo",
+  "parameters": [
+    {
+      "id": "screenColor",
+      "label": "Screen Color",
+      "type": "color",
+      "default": [0.15, 0.85, 0.2, 1.0],
+      "min": [0.0, 0.0, 0.0, 0.0],
+      "max": [1.0, 1.0, 1.0, 1.0],
+      "step": [0.01, 0.01, 0.01, 0.01]
+    },
+    {
+      "id": "threshold",
+      "label": "Threshold",
+      "type": "float",
+      "default": 0.24,
+      "min": 0.01,
+      "max": 0.8,
+      "step": 0.005
+    },
+    {
+      "id": "softness",
+      "label": "Softness",
+      "type": "float",
+      "default": 0.12,
+      "min": 0.001,
+      "max": 0.5,
+      "step": 0.005
+    },
+    {
+      "id": "edgeSoftness",
+      "label": "Edge Softness",
+      "type": "float",
+      "default": 0.08,
+      "min": 0.0,
+      "max": 0.4,
+      "step": 0.005
+    },
+    {
+      "id": "erodeDilate",
+      "label": "Erode/Dilate",
+      "type": "float",
+      "default": 0.0,
+      "min": -0.3,
+      "max": 0.3,
+      "step": 0.005
+    },
+    {
+      "id": "despill",
+      "label": "Despill",
+      "type": "float",
+      "default": 0.45,
+      "min": 0.0,
+      "max": 1.5,
+      "step": 0.01
+    },
+    {
+      "id": "edgeBoost",
+      "label": "Edge Boost",
+      "type": "float",
+      "default": 0.08,
+      "min": -0.2,
+      "max": 0.3,
+      "step": 0.005
+    },
+    {
+      "id": "clipBlack",
+      "label": "Clip Black",
+      "type": "float",
+      "default": 0.0,
+      "min": 0.0,
+      "max": 0.5,
+      "step": 0.005
+    },
+    {
+      "id": "clipWhite",
+      "label": "Clip White",
+      "type": "float",
+      "default": 1.0,
+      "min": 0.5,
+      "max": 1.0,
+      "step": 0.005
+    }
+  ]
+}
diff --git a/shaders/greenscreen-key/shader.slang b/shaders/greenscreen-key/shader.slang
new file mode 100644
index 0000000..646ae5b
--- /dev/null
+++ b/shaders/greenscreen-key/shader.slang
@@ -0,0 +1,40 @@
+float3 safeNormalize(float3 value)
+{
+	float len = max(length(value), 0.0001);
+	return value / len;
+}
+
+float luma709(float3 color)
+{
+	return dot(color, float3(0.2126, 0.7152, 0.0722));
+}
+
+float4 shadeVideo(ShaderContext context)
+{
+	float4 src = context.sourceColor;
+	float3 color = saturate(src.rgb);
+
+	float3 keyColor = safeNormalize(max(screenColor.rgb, float3(0.0001, 0.0001, 0.0001)));
+	float3 sampleColor = safeNormalize(max(color, float3(0.0001, 0.0001, 0.0001)));
+
+	float chromaDistance = length(sampleColor - keyColor);
+	float matteCenter = threshold - erodeDilate;
+	float matteFeather = max(softness + edgeSoftness, 0.0005);
+	float alpha = smoothstep(matteCenter - matteFeather, matteCenter + matteFeather, chromaDistance);
+
+	alpha = saturate((alpha - clipBlack) / max(clipWhite - clipBlack, 0.0001));
+	alpha = saturate(alpha + edgeBoost);
+
+	float greenExcess = max(0.0, color.g - max(color.r, color.b));
+	float spillReduction = greenExcess * despill;
+
+	float3 despilled = color;
+	despilled.g = max(0.0, despilled.g - spillReduction);
+
+	float neutral = luma709(despilled);
+	despilled.rb += spillReduction * 0.25;
+	despilled = lerp(float3(neutral, neutral, neutral), despilled, 0.92);
+
+	float3 premultiplied = saturate(despilled) * alpha;
+	return float4(premultiplied, alpha);
+}
diff --git a/shaders/temporal-low-fps/shader.json b/shaders/temporal-low-fps/shader.json
index d25ba51..a2d10ec 100644
--- a/shaders/temporal-low-fps/shader.json
+++ b/shaders/temporal-low-fps/shader.json
@@ -6,7 +6,7 @@
   "entryPoint": "shadeVideo",
   "temporal": {
     "enabled": true,
-    "historySource": "source",
+    "historySource": "preLayerInput",
     "historyLength": 8
   },
   "parameters": [
diff --git a/shaders/temporal-low-fps/shader.slang b/shaders/temporal-low-fps/shader.slang
index d10e289..4c679fd 100644
--- a/shaders/temporal-low-fps/shader.slang
+++ b/shaders/temporal-low-fps/shader.slang
@@ -8,8 +8,8 @@ float4 shadeVideo(ShaderContext context)
 	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 lowerHeld = lowerPhase == 0 ? context.sourceColor : sampleTemporalHistory(lowerPhase - 1, context.uv);
+	float4 upperHeld = upperPhase == 0 ? context.sourceColor : sampleTemporalHistory(upperPhase - 1, context.uv);
 	float4 held = lerp(lowerHeld, upperHeld, fractional);
 	return lerp(context.sourceColor, held, clamp(blendAmount, 0.0, 1.0));
 }