CAM: implement basic camera functions with a blank camera

src/core/frontend/camera/factory.cpp

@@ -0,0 +1,32 @@
+// Copyright 2016 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <unordered_map>
+#include "common/logging/log.h"
+#include "core/frontend/camera/blank_camera.h"
+#include "core/frontend/camera/factory.h"
+
+namespace Camera {
+
+static std::unordered_map<std::string, std::unique_ptr<CameraFactory>> factories;
+
+CameraFactory::~CameraFactory() = default;
+
+void RegisterFactory(const std::string& name, std::unique_ptr<CameraFactory> factory) {
+    factories[name] = std::move(factory);
+}
+
+std::unique_ptr<CameraInterface> CreateCamera(const std::string& name, const std::string& config) {
+    auto pair = factories.find(name);
+    if (pair != factories.end()) {
+        return pair->second->Create(config);
+    }
+
+    if (name != "blank") {
+        LOG_ERROR(Service_CAM, "Unknown camera \"%s\"", name.c_str());
+    }
+    return std::make_unique<BlankCamera>();
+}
+
+} // namespace Camera