private AccessorId AccessorToId(Accessor accessor, EntryBufferView bufferView)
{
if (root.Accessors == null)
{
root.Accessors = new List<Accessor>();
}
accessor.BufferView = bufferView.id;
accessor.Name = bufferView.view.Name;
root.Accessors.Add(accessor);
return new AccessorId { Id = root.Accessors.Count - 1, Root = root };
}
public Pair<MeshId, bool> SaveMesh(UnityEngine.Mesh mesh, Renderer renderer)
{
if (root.Meshes == null)
{
root.Meshes = new List<GLTF.Schema.Mesh>();
}
string materialsId = "";
foreach (var mat in renderer.sharedMaterials)
{
materialsId += mat.GetInstanceID();
}
if (_mesh2Id.ContainsKey(mesh) && _mesh2Id[mesh].ContainsKey(materialsId))
{
return new Pair<MeshId, bool>(_mesh2Id[mesh][materialsId], false);
}
var m = new GLTF.Schema.Mesh();
var attributes = GenerateAttributes(mesh);
var targets = GenerateMorphTargets(mesh, m);
m.Name = mesh.name;
m.Primitives = new List<MeshPrimitive>();
EntryBufferView indices = null;
for (int i = 0; i < mesh.subMeshCount; i += 1)
{
var primitive = new MeshPrimitive();
m.Primitives.Add(primitive);
primitive.Attributes = attributes;
primitive.Mode = DrawMode.Triangles;
if (targets.Count > 0)
{
primitive.Targets = targets;
}
SaveIndices(mesh, primitive, i, ref indices);
}
root.Meshes.Add(m);
var id = new MeshId { Id = root.Meshes.Count - 1, Root = root };
if (!_mesh2Id.ContainsKey(mesh))
{
_mesh2Id.Add(mesh, new Dictionary<string, MeshId>());
}
_mesh2Id[mesh].Add(materialsId, id);
return new Pair<MeshId, bool>(id, true);
}
public EntryBufferView CreateStreamBufferView(string name)
{
if (root.BufferViews == null)
{
root.BufferViews = new List<BufferView>();
}
var bufferView = new EntryBufferView();
bufferView.streamBuffer = new MemoryStream();
bufferView.view.Name = name;
_bufferViews.Add(bufferView);
root.BufferViews.Add(bufferView.view);
bufferView.id = new BufferViewId { Id = root.BufferViews.Count - 1, Root = root };
return bufferView;
}
public EntryBufferView CreateByteBufferView(string name, int size, int stride)
{
if (root.BufferViews == null)
{
root.BufferViews = new List<BufferView>();
}
var bufferView = new EntryBufferView();
bufferView.byteBuffer = new byte[size];
bufferView.view.Name = name;
bufferView.view.ByteStride = stride;
_bufferViews.Add(bufferView);
root.BufferViews.Add(bufferView.view);
bufferView.id = new BufferViewId { Id = root.BufferViews.Count - 1, Root = root };
return bufferView;
}
private AccessorId PackAttrToBufferShort<DataType>(EntryBufferView bufferView, DataType[] data, int offset, Func<DataType[], int, DataType> getValueByIndex = null)
{
var accessor = ExporterUtils.PackToBuffer(bufferView.byteBuffer, data, GLTFComponentType.UnsignedShort, offset, bufferView.view.ByteStride, getValueByIndex);
return AccessorToId(accessor, bufferView);
}
private void SaveIndices(UnityEngine.Mesh mesh, MeshPrimitive primitive, int i, ref EntryBufferView bufferView)
{
primitive.Mode = DrawMode.Triangles;
if (_mesh2indices.ContainsKey(mesh) && _mesh2indices[mesh].ContainsKey(i))
{
primitive.Indices = _mesh2indices[mesh][i];
return;
}
if (bufferView == null)
{
bufferView = CreateStreamBufferView(mesh.name + "-indices");
}
primitive.Indices = AccessorToId(
ExporterUtils.PackToBuffer(bufferView.streamBuffer, mesh.GetTriangles(i), GLTFComponentType.UnsignedShort, (int[] data, int index) => {
var offset = index % 3;
return data[offset == 0 ? index : offset == 1 ? index + 1 : index - 1];
}),
bufferView
);
primitive.Indices.Value.Name += "-" + i;
if (!_mesh2indices.ContainsKey(mesh))
{
_mesh2indices.Add(mesh, new Dictionary<int, AccessorId>());
}
_mesh2indices[mesh].Add(i, primitive.Indices);
}
