Added green screen

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
+    }
+  ]
+}