{
  "blend": {
    "func": "add",
    "srcrgb": "srcalpha",
    "dstrgb": "1-srcalpha"
  },
  "vertex": "blit",
  "fragment": "grayscale",
  "attributes": [ "Position" ],
  "samplers": [
    { "name": "DiffuseSampler" }
  ],
  "uniforms": [
    { "name": "ProjMat",       "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
    { "name": "OutSize",       "type": "float",     "count": 2,  "values": [ 1.0, 1.0 ] }
  ]
}