Add Texture Set schema (#266)

source/resource/textures/texture_set.json

@@ -0,0 +1,111 @@
+{
+  "$schema": "http://json-schema.org/draft-07/schema",
+  "$id": "blockception.minecraft.resource.texture.texture_set",
+  "type": "object",
+  "additionalProperties": false,
+  "properties": {
+    "format_version": { "$ref": "../../general/format_version.json" },
+    "minecraft:texture_set": {
+      "title": "Texture Set",
+      "description": "Texture Sets are used to define multiple PBR layers for a texture resource.",
+      "type": "object",
+      "additionalProperties": false,
+      "required": ["color"],
+      "properties": {
+        "color": { "$ref": "#/definitions/color" },
+        "heightmap": { "$ref": "#/definitions/heightmap" },
+        "metalness_emissive_roughness": { "$ref": "#/definitions/mer" },
+        "normal": { "$ref": "#/definitions/normal" }
+      }
+    }
+  },
+  "definitions": {
+    "color": {
+      "title": "Color",
+      "description": "This is an RGB 3-channel image (defaults to uniform alpha of 1.0), or an RGBA 4-channel image, or a 4 value array for a uniform color with alpha.",
+      "examples": [[255, 255, 255, 255]],
+      "oneOf": [
+        { "type": "string" },
+        {
+          "type": "array",
+          "items": [
+            {
+              "title": "Red",
+              "type": "integer",
+              "minimum": 0,
+              "maximum": 255
+            },
+            {
+              "title": "Green",
+              "type": "integer",
+              "minimum": 0,
+              "maximum": 255
+            },
+            {
+              "title": "Blue",
+              "type": "integer",
+              "minimum": 0,
+              "maximum": 255
+            },
+            {
+              "title": "Alpha",
+              "type": "integer",
+              "default": 255,
+              "minimum": 0,
+              "maximum": 255
+            }
+          ]
+        }
+      ]
+    },
+    "normal": {
+      "title": "Normal Map",
+      "description": "This is a 3-channel normal map image (or 4-channel where the 4th channel is ignored). This layer and the \"heightmap\" layer should not both be defined at the same time.",
+      "type": "string"
+    },
+    "heightmap": {
+      "title": "Heightmap",
+      "description": "1-channel layer image or a single value in this JSON file for a uniform heightmap. This layer and the \"normal\" layer should not both be defined at the same time.",
+      "examples": [255],
+      "oneOf": [
+        { "type": "string" },
+        {
+          "type": "integer",
+          "minimum": 0,
+          "maximum": 255
+        }
+      ]
+    },
+    "mer": {
+      "title": "Metalness Emissive Roughness",
+      "description": "This is a 3-channel image (or 4-channel where the 4th channel is ignored) or a 3-value array for a uniform MER. RGB images map Red to Metalness, Green to Emissive, and Blue to Roughness.",
+      "examples": [[255, 255, 255]],
+      "oneOf": [
+        { "type": "string" },
+        {
+          "type": "array",
+          "items": [
+            {
+              "title": "Red",
+              "type": "integer",
+              "minimum": 0,
+              "maximum": 255
+            },
+            {
+              "title": "Green",
+              "type": "integer",
+              "minimum": 0,
+              "maximum": 255
+            },
+            {
+              "title": "Blue",
+              "type": "integer",
+              "minimum": 0,
+              "maximum": 255
+            }
+          ]
+        }
+      ]
+    }
+  }
+}