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-rw-r--r--src/shader_recompiler/object_pool.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/src/shader_recompiler/object_pool.h b/src/shader_recompiler/object_pool.h
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+++ b/src/shader_recompiler/object_pool.h
@@ -0,0 +1,105 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <type_traits>
+#include <utility>
+
+namespace Shader {
+
+template <typename T>
+requires std::is_destructible_v<T> class ObjectPool {
+public:
+ explicit ObjectPool(size_t chunk_size = 8192) : new_chunk_size{chunk_size} {
+ node = &chunks.emplace_back(new_chunk_size);
+ }
+
+ template <typename... Args>
+ requires std::is_constructible_v<T, Args...>[[nodiscard]] T* Create(Args&&... args) {
+ return std::construct_at(Memory(), std::forward<Args>(args)...);
+ }
+
+ void ReleaseContents() {
+ if (chunks.empty()) {
+ return;
+ }
+ Chunk& root{chunks.front()};
+ if (root.used_objects == root.num_objects) {
+ // Root chunk has been filled, squash allocations into it
+ const size_t total_objects{root.num_objects + new_chunk_size * (chunks.size() - 1)};
+ chunks.clear();
+ chunks.emplace_back(total_objects);
+ } else {
+ root.Release();
+ chunks.resize(1);
+ }
+ chunks.shrink_to_fit();
+ node = &chunks.front();
+ }
+
+private:
+ struct NonTrivialDummy {
+ NonTrivialDummy() noexcept {}
+ };
+
+ union Storage {
+ Storage() noexcept {}
+ ~Storage() noexcept {}
+
+ NonTrivialDummy dummy{};
+ T object;
+ };
+
+ struct Chunk {
+ explicit Chunk() = default;
+ explicit Chunk(size_t size)
+ : num_objects{size}, storage{std::make_unique<Storage[]>(size)} {}
+
+ Chunk& operator=(Chunk&& rhs) noexcept {
+ Release();
+ used_objects = std::exchange(rhs.used_objects, 0);
+ num_objects = std::exchange(rhs.num_objects, 0);
+ storage = std::move(rhs.storage);
+ return *this;
+ }
+
+ Chunk(Chunk&& rhs) noexcept
+ : used_objects{std::exchange(rhs.used_objects, 0)},
+ num_objects{std::exchange(rhs.num_objects, 0)}, storage{std::move(rhs.storage)} {}
+
+ ~Chunk() {
+ Release();
+ }
+
+ void Release() {
+ std::destroy_n(storage.get(), used_objects);
+ used_objects = 0;
+ }
+
+ size_t used_objects{};
+ size_t num_objects{};
+ std::unique_ptr<Storage[]> storage;
+ };
+
+ [[nodiscard]] T* Memory() {
+ Chunk* const chunk{FreeChunk()};
+ return &chunk->storage[chunk->used_objects++].object;
+ }
+
+ [[nodiscard]] Chunk* FreeChunk() {
+ if (node->used_objects != node->num_objects) {
+ return node;
+ }
+ node = &chunks.emplace_back(new_chunk_size);
+ return node;
+ }
+
+ Chunk* node{};
+ std::vector<Chunk> chunks;
+ size_t new_chunk_size{};
+};
+
+} // namespace Shader