Working

shaders/studio-color/shader.json

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+{
+  "id": "studio-color",
+  "name": "Studio Color",
+  "description": "A built-in sample shader package that demonstrates the runtime parameter contract.",
+  "category": "Built-in",
+  "entryPoint": "shadeVideo",
+  "parameters": [
+    {
+      "id": "brightness",
+      "label": "Brightness",
+      "type": "float",
+      "default": 1.0,
+      "min": 0.0,
+      "max": 2.0,
+      "step": 0.01
+    },
+    {
+      "id": "offset",
+      "label": "Offset",
+      "type": "vec2",
+      "default": [0.0, 0.0],
+      "min": [-0.2, -0.2],
+      "max": [0.2, 0.2],
+      "step": [0.001, 0.001]
+    },
+    {
+      "id": "tint",
+      "label": "Tint",
+      "type": "color",
+      "default": [1.0, 1.0, 1.0, 1.0]
+    },
+    {
+      "id": "invert",
+      "label": "Invert",
+      "type": "bool",
+      "default": false
+    },
+    {
+      "id": "mode",
+      "label": "Mode",
+      "type": "enum",
+      "default": "normal",
+      "options": [
+        { "value": "normal", "label": "Normal" },
+        { "value": "luma", "label": "Luma" },
+        { "value": "posterize", "label": "Posterize" }
+      ]
+    }
+  ]
+}

shaders/studio-color/shader.slang

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+float4 shadeVideo(ShaderContext context)
+{
+	float2 uv = clamp(context.uv + offset, float2(0.0, 0.0), float2(1.0, 1.0));
+	float4 color = sampleVideo(uv);
+
+	color.rgb *= brightness;
+	color *= tint;
+
+	if (invert)
+		color.rgb = 1.0 - color.rgb;
+
+	if (mode == 1)
+	{
+		float luma = dot(color.rgb, float3(0.2126, 0.7152, 0.0722));
+		color.rgb = float3(luma, luma, luma);
+	}
+	else if (mode == 2)
+	{
+		color.rgb = floor(color.rgb * 4.0) / 4.0;
+	}
+
+	return saturate(color);
+}