Multi pass test

shaders/gaussian-blur/shader.json

@@ -1,9 +1,25 @@
 {
   "id": "gaussian-blur",
   "name": "Gaussian Blur",
-  "description": "Applies a simple Gaussian-style blur to the decoded video input.",
+  "description": "Applies a separable two-pass Gaussian-style blur to the decoded video input.",
   "category": "Transform",
   "entryPoint": "shadeVideo",
+  "passes": [
+    {
+      "id": "horizontal",
+      "source": "shader.slang",
+      "entryPoint": "blurHorizontal",
+      "inputs": ["layerInput"],
+      "output": "blurHorizontal"
+    },
+    {
+      "id": "vertical",
+      "source": "shader.slang",
+      "entryPoint": "blurVertical",
+      "inputs": ["blurHorizontal"],
+      "output": "layerOutput"
+    }
+  ],
   "parameters": [
     {
       "id": "radius",