Add glTF morph animation support (PoC)

games/devtest/mods/gltf/LICENSE.md

@@ -12,3 +12,6 @@ The glTF test models (and corresponding textures) in this mod are all licensed f
 * Minimal triangle, triangle without indices (`gltf_minimal_triangle.gltf`, `gltf_triangle_without_indices.gltf`)
   * From [the glTF sample model collection](https://github.com/KhronosGroup/glTF-Sample-Models)
   * Licensed under CC0 / public domain
+
+<!-- TODO detail -->
+Morph stuff is from https://github.com/KhronosGroup/glTF-Sample-Assets/

games/devtest/mods/gltf/init.lua

@@ -30,6 +30,41 @@ end
 
 register_entity("snow_man", {"gltf_snow_man.png"})
 register_entity("spider", {"gltf_spider.png"})
+core.register_entity("gltf:morph", {
+	initial_properties = {
+		visual = "mesh",
+		mesh = "gltf_morph_static.glb",
+		textures = {"gltf_morph_static.jpg"},
+		backface_culling = false,
+		visual_size = vector.new(5, 5, 5),
+	},
+})
+
+core.register_entity("gltf:morph_animated", {
+	initial_properties = {
+		visual = "mesh",
+		mesh = "gltf_morph_animated.glb",
+		textures = {},
+		backface_culling = false,
+		visual_size = vector.new(100, 100, 100),
+	},
+	on_activate = function(self)
+		self.object:set_animation({x = 0, y = 5}, 1)
+	end
+})
+
+core.register_entity("gltf:morph_animated2", {
+	initial_properties = {
+		visual = "mesh",
+		mesh = "gltf_morph_animated2.gltf",
+		textures = {},
+		backface_culling = false,
+		visual_size = vector.new(1, 1, 1),
+	},
+	on_activate = function(self)
+		self.object:set_animation({x = 0, y = 5}, 1)
+	end
+})
 
 core.register_entity("gltf:spider_animated", {
 	initial_properties = {

games/devtest/mods/gltf/models/gltf_morph_animated2.gltf

@@ -0,0 +1,192 @@
+{
+  "scene" : 0,
+  "scenes":[
+    {
+      "nodes":[
+        0
+      ]
+    }
+  ],
+  "nodes":[
+    {
+      "mesh":0
+    }
+  ],
+  "meshes":[
+    {
+      "primitives":[
+        {
+          "attributes":{
+            "POSITION":1
+          },
+          "targets":[
+            {
+              "POSITION":2
+            },
+            {
+              "POSITION":3
+            }
+          ],
+          "indices":0
+        }
+      ],
+      "weights":[
+        0.5,
+        0.5
+      ]
+    }
+  ],
+
+  "animations":[
+    {
+      "samplers":[
+        {
+          "input":4,
+          "interpolation":"LINEAR",
+          "output":5
+        }
+      ],
+      "channels":[
+        {
+          "sampler":0,
+          "target":{
+            "node":0,
+            "path":"weights"
+          }
+        }
+      ]
+    }
+  ],
+
+  "buffers":[
+    {
+      "uri":"data:application/gltf-buffer;base64,AAABAAIAAAAAAAAAAAAAAAAAAAAAAIA/AAAAAAAAAAAAAAA/AAAAPwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIC/AACAPwAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAIA/AACAPwAAAAA=",
+      "byteLength":116
+    },
+    {
+      "uri":"data:application/gltf-buffer;base64,AAAAAAAAgD8AAABAAABAQAAAgEAAAAAAAAAAAAAAAAAAAIA/AACAPwAAgD8AAIA/AAAAAAAAAAAAAAAA",
+      "byteLength":60
+    }
+  ],
+  "bufferViews":[
+    {
+      "buffer":0,
+      "byteOffset":0,
+      "byteLength":6,
+      "target":34963
+    },
+    {
+      "buffer":0,
+      "byteOffset":8,
+      "byteLength":108,
+      "byteStride":12,
+      "target":34962
+    },
+    {
+      "buffer":1,
+      "byteOffset":0,
+      "byteLength":20
+    },
+    {
+      "buffer":1,
+      "byteOffset":20,
+      "byteLength":40
+    }
+  ],
+  "accessors":[
+    {
+      "bufferView":0,
+      "byteOffset":0,
+      "componentType":5123,
+      "count":3,
+      "type":"SCALAR",
+      "max":[
+        2
+      ],
+      "min":[
+        0
+      ]
+    },
+    {
+      "bufferView":1,
+      "byteOffset":0,
+      "componentType":5126,
+      "count":3,
+      "type":"VEC3",
+      "max":[
+        1.0,
+        0.5,
+        0.0
+      ],
+      "min":[
+        0.0,
+        0.0,
+        0.0
+      ]
+    },
+    {
+      "bufferView":1,
+      "byteOffset":36,
+      "componentType":5126,
+      "count":3,
+      "type":"VEC3",
+      "max":[
+        0.0,
+        1.0,
+        0.0
+      ],
+      "min":[
+        -1.0,
+        0.0,
+        0.0
+      ]
+    },
+    {
+      "bufferView":1,
+      "byteOffset":72,
+      "componentType":5126,
+      "count":3,
+      "type":"VEC3",
+      "max":[
+        1.0,
+        1.0,
+        0.0
+      ],
+      "min":[
+        0.0,
+        0.0,
+        0.0
+      ]
+    },
+    {
+      "bufferView":2,
+      "byteOffset":0,
+      "componentType":5126,
+      "count":5,
+      "type":"SCALAR",
+      "max":[
+        4.0
+      ],
+      "min":[
+        0.0
+      ]
+    },
+    {
+      "bufferView":3,
+      "byteOffset":0,
+      "componentType":5126,
+      "count":10,
+      "type":"SCALAR",
+      "max":[
+        1.0
+      ],
+      "min":[
+        0.0
+      ]
+    }
+  ],
+
+  "asset":{
+    "version":"2.0"
+  }
+}