VideoCommon: add a texture pool for resource management

Source/Core/DolphinLib.props

@@ -756,6 +756,7 @@
     <ClInclude Include="VideoCommon\Resources\CustomResourceManager.h" />
     <ClInclude Include="VideoCommon\Resources\Resource.h" />
     <ClInclude Include="VideoCommon\Resources\TextureDataResource.h" />
+    <ClInclude Include="VideoCommon\Resources\TexturePool.h" />
     <ClInclude Include="VideoCommon\ShaderCache.h" />
     <ClInclude Include="VideoCommon\ShaderCompileUtils.h" />
     <ClInclude Include="VideoCommon\ShaderGenCommon.h" />
@@ -1409,6 +1410,7 @@
     <ClCompile Include="VideoCommon\Resources\CustomResourceManager.cpp" />
     <ClCompile Include="VideoCommon\Resources\Resource.cpp" />
     <ClCompile Include="VideoCommon\Resources\TextureDataResource.cpp" />
+    <ClCompile Include="VideoCommon\Resources\TexturePool.cpp" />
     <ClCompile Include="VideoCommon\ShaderCache.cpp" />
     <ClCompile Include="VideoCommon\ShaderCompileUtils.cpp" />
     <ClCompile Include="VideoCommon\ShaderGenCommon.cpp" />

Source/Core/VideoCommon/CMakeLists.txt

@@ -152,6 +152,8 @@ add_library(videocommon
   Resources/Resource.h
   Resources/TextureDataResource.cpp
   Resources/TextureDataResource.h
+  Resources/TexturePool.cpp
+  Resources/TexturePool.h
   ShaderCache.cpp
   ShaderCache.h
   ShaderCompileUtils.cpp

Source/Core/VideoCommon/Resources/TexturePool.cpp

@@ -0,0 +1,43 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "VideoCommon/Resources/TexturePool.h"
+
+#include "Common/Logging/Log.h"
+
+#include "VideoCommon/AbstractGfx.h"
+#include "VideoCommon/AbstractTexture.h"
+
+namespace VideoCommon
+{
+void TexturePool::Reset()
+{
+  m_cache.clear();
+}
+
+std::unique_ptr<AbstractTexture> TexturePool::AllocateTexture(const TextureConfig& config)
+{
+  const auto iter = m_cache.find(config);
+  if (iter != m_cache.end())
+  {
+    auto entry = std::move(iter->second);
+    m_cache.erase(iter);
+    return entry;
+  }
+
+  std::unique_ptr<AbstractTexture> texture = g_gfx->CreateTexture(config);
+  if (!texture)
+  {
+    ERROR_LOG_FMT(VIDEO, "Failed to allocate a {}x{}x{} texture", config.width, config.height,
+                  config.layers);
+    return {};
+  }
+  return texture;
+}
+
+void TexturePool::ReleaseTexture(std::unique_ptr<AbstractTexture> texture)
+{
+  auto config = texture->GetConfig();
+  (void)m_cache.emplace(config, std::move(texture));
+}
+}  // namespace VideoCommon

Source/Core/VideoCommon/Resources/TexturePool.h

@@ -0,0 +1,25 @@
+// Copyright 2025 Dolphin Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include <memory>
+#include <unordered_map>
+
+#include "VideoCommon/AbstractTexture.h"
+#include "VideoCommon/TextureConfig.h"
+
+namespace VideoCommon
+{
+class TexturePool
+{
+public:
+  void Reset();
+
+  std::unique_ptr<AbstractTexture> AllocateTexture(const TextureConfig& config);
+  void ReleaseTexture(std::unique_ptr<AbstractTexture> texture);
+
+private:
+  std::unordered_multimap<TextureConfig, std::unique_ptr<AbstractTexture>> m_cache;
+};
+}  // namespace VideoCommon