chore: add output implementations for gltf and glb

src/ObjWriting/XModel/Gltf/GltfOutput.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include <nlohmann/json_fwd.hpp>
+#include <optional>
+#include <string>
+
+namespace gltf
+{
+    class Output
+    {
+    protected:
+        Output() = default;
+        virtual ~Output() = default;
+        Output(const Output& other) = default;
+        Output(Output&& other) noexcept = default;
+        Output& operator=(const Output& other) = default;
+        Output& operator=(Output&& other) noexcept = default;
+
+    public:
+        virtual std::optional<std::string> CreateBufferUri(const void* buffer, size_t bufferSize) const = 0;
+        virtual void EmitJson(const nlohmann::json& json) const = 0;
+        virtual void EmitBuffer(const void* buffer, size_t bufferSize) const = 0;
+        virtual void Finalize() const = 0;
+    };
+} // namespace gltf