arena.h

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#ifndef YAZE_APP_GFX_ARENA_H
#define YAZE_APP_GFX_ARENA_H
 
#include <array>
#include <cstdint>
#include <functional>
#include <memory>
#include <mutex>
#include <string>
#include <tuple>
#include <unordered_map>
#include <vector>
 
#include "app/gfx/core/bitmap.h"
#include "app/gfx/render/background_buffer.h"
#include "util/sdl_deleter.h"
 
namespace yaze {
namespace gfx {
 
class Arena {
 public:
  static Arena& Get();
 
  void Initialize(IRenderer* renderer);
  ~Arena();
 
  // --- New Deferred Command System ---
  enum class TextureCommandType { CREATE, UPDATE, DESTROY };
  struct TextureCommand {
    TextureCommandType type;
    Bitmap* bitmap;  // The bitmap that needs a texture operation
    uint32_t generation;  // Generation at queue time for staleness detection
  };
 
  void QueueTextureCommand(TextureCommandType type, Bitmap* bitmap);
  void ProcessTextureQueue(IRenderer* renderer);
  void ClearTextureQueue();
 
  bool HasPendingTextures() const { return !texture_command_queue_.empty(); }
 
  bool ProcessSingleTexture(IRenderer* renderer);
 
  // --- Surface Management (unchanged) ---
  SDL_Surface* AllocateSurface(int width, int height, int depth, int format);
  void FreeSurface(SDL_Surface* surface);
 
  void Shutdown();
 
  // Resource tracking for debugging
  size_t GetTextureCount() const { return textures_.size(); }
  size_t GetSurfaceCount() const { return surfaces_.size(); }
  size_t GetPooledTextureCount() const {
    return texture_pool_.available_textures_.size();
  }
  size_t GetPooledSurfaceCount() const {
    return surface_pool_.available_surfaces_.size();
  }
  size_t texture_command_queue_size() const {
    return texture_command_queue_.size();
  }
 
  // Graphics sheet access (223 total sheets in YAZE)
  std::array<gfx::Bitmap, 223>& gfx_sheets() { return gfx_sheets_; }
 
  auto gfx_sheet(int i) {
    if (i < 0 || i >= 223) return gfx::Bitmap{};
    return gfx_sheets_[i];
  }
 
  auto mutable_gfx_sheet(int i) {
    if (i < 0 || i >= 223) return static_cast<gfx::Bitmap*>(nullptr);
    return &gfx_sheets_[i];
  }
 
  auto mutable_gfx_sheets() { return &gfx_sheets_; }
 
  void NotifySheetModified(int sheet_index);
 
  // ========== Palette Change Notification System ==========
 
  using PaletteChangeCallback =
      std::function<void(const std::string& group_name, int palette_index)>;
 
  void NotifyPaletteModified(const std::string& group_name,
                             int palette_index = -1);
 
  int RegisterPaletteListener(PaletteChangeCallback callback);
 
  void UnregisterPaletteListener(int listener_id);
 
  // Background buffer access for SNES layer rendering
  auto& bg1() { return bg1_; }
 
  auto& bg2() { return bg2_; }
 
 private:
  Arena();
 
  BackgroundBuffer bg1_;
  BackgroundBuffer bg2_;
 
  static constexpr int kTilesPerRow = 64;
  static constexpr int kTilesPerColumn = 64;
  static constexpr int kTotalTiles = kTilesPerRow * kTilesPerColumn;
 
  std::array<uint16_t, kTotalTiles> layer1_buffer_;
  std::array<uint16_t, kTotalTiles> layer2_buffer_;
 
  std::array<gfx::Bitmap, 223> gfx_sheets_;
 
  std::unordered_map<TextureHandle,
                     std::unique_ptr<SDL_Texture, util::SDL_Texture_Deleter>>
      textures_;
 
  std::unordered_map<SDL_Surface*,
                     std::unique_ptr<SDL_Surface, util::SDL_Surface_Deleter>>
      surfaces_;
 
  // Resource pooling for efficient memory management
  struct TexturePool {
    std::vector<TextureHandle> available_textures_;
    std::unordered_map<TextureHandle, std::pair<int, int>> texture_sizes_;
    static constexpr size_t MAX_POOL_SIZE = 100;
  } texture_pool_;
 
  struct SurfacePool {
    std::vector<SDL_Surface*> available_surfaces_;
    std::unordered_map<SDL_Surface*, std::tuple<int, int, int, int>>
        surface_info_;
    static constexpr size_t MAX_POOL_SIZE = 100;
  } surface_pool_;
 
  std::vector<TextureCommand> texture_command_queue_;
  IRenderer* renderer_ = nullptr;
 
  // Palette change notification system
  std::unordered_map<int, PaletteChangeCallback> palette_listeners_;
  int next_palette_listener_id_ = 1;
};
 
}  // namespace gfx
}  // namespace yaze
 
#endif  // YAZE_APP_GFX_ARENA_H