VideoCommon: add render target asset

Source/Core/VideoCommon/Assets/RenderTargetAsset.cpp

@@ -0,0 +1,43 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "VideoCommon/Assets/RenderTargetAsset.h"
+
+#include "Common/EnumUtils.h"
+#include "Common/JsonUtil.h"
+#include "Common/Logging/Log.h"
+
+namespace VideoCommon
+{
+bool RenderTargetData::FromJson(const CustomAssetLibrary::AssetID& asset_id,
+                                const picojson::object& json, RenderTargetData* data)
+{
+  data->m_texture_format = AbstractTextureFormat::RGBA8;
+  // TODO: parse format
+  return true;
+}
+
+void RenderTargetData::ToJson(picojson::object* obj, const RenderTargetData& data)
+{
+  if (!obj) [[unlikely]]
+    return;
+
+  auto& json_obj = *obj;
+  json_obj.emplace("format", static_cast<double>(data.m_texture_format));
+}
+
+CustomAssetLibrary::LoadInfo
+RenderTargetAsset::LoadImpl(const CustomAssetLibrary::AssetID& asset_id)
+{
+  auto potential_data = std::make_shared<RenderTargetData>();
+  const auto loaded_info = m_owning_library->LoadRenderTarget(asset_id, potential_data.get());
+  if (loaded_info.m_bytes_loaded == 0)
+    return {};
+  {
+    std::lock_guard lk(m_data_lock);
+    m_loaded = true;
+    m_data = std::move(potential_data);
+  }
+  return loaded_info;
+}
+}  // namespace VideoCommon

Source/Core/VideoCommon/Assets/RenderTargetAsset.h

@@ -0,0 +1,31 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <picojson.h>
+
+#include "VideoCommon/Assets/CustomAsset.h"
+#include "VideoCommon/RenderState.h"
+#include "VideoCommon/TextureConfig.h"
+
+namespace VideoCommon
+{
+struct RenderTargetData
+{
+  static bool FromJson(const CustomAssetLibrary::AssetID& asset_id, const picojson::object& json,
+                       RenderTargetData* data);
+  static void ToJson(picojson::object* obj, const RenderTargetData& data);
+  AbstractTextureFormat m_texture_format;
+  SamplerState m_sampler;
+};
+
+class RenderTargetAsset final : public CustomLoadableAsset<RenderTargetData>
+{
+public:
+  using CustomLoadableAsset::CustomLoadableAsset;
+
+private:
+  CustomAssetLibrary::LoadInfo LoadImpl(const CustomAssetLibrary::AssetID& asset_id) override;
+};
+}  // namespace VideoCommon