Matt Hills
14045accb5
Renders the emulator framebuffer into a calculated sub-rect with nearest-neighbor scaling and black bars, driven by the core's reported aspect ratio. Adds a cycle button in the game HUD and a display mode setting in the settings screen.
125 lines
4.1 KiB
C++
125 lines
4.1 KiB
C++
#pragma once
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#include "libretro.h"
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#include "audio_engine.h"
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#include <android/native_window.h>
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#include <atomic>
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#include <mutex>
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#include <string>
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#include <thread>
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#include <unordered_map>
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enum class DisplayMode : int {
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STRETCH = 0,
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ASPECT_RATIO = 1,
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INTEGER_SCALE = 2
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};
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class LibretroFrontend {
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public:
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static LibretroFrontend& instance();
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bool loadCore(const char* soPath);
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bool loadGame(const char* romPath);
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void start();
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void pause();
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void resume();
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void stop();
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void reset();
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void setWindow(ANativeWindow* window);
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void releaseWindow();
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void setButtonState(uint16_t state);
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void setAnalogState(int stick, int16_t x, int16_t y);
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bool saveState(const char* path);
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bool loadState(const char* path);
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void setAudioEnabled(bool enabled);
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void setFrameSkip(int skip);
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void setDisplayMode(int mode);
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void setSystemDir(const char* dir);
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void setSaveDir(const char* dir);
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bool isRunning() const { return running_.load(); }
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private:
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LibretroFrontend() = default;
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~LibretroFrontend();
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void runLoop();
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void unloadCore();
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// Libretro callbacks (static because libretro uses C function pointers)
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static bool environmentCallback(unsigned cmd, void* data);
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static void videoRefreshCallback(const void* data, unsigned width, unsigned height, size_t pitch);
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static size_t audioSampleBatchCallback(const int16_t* data, size_t frames);
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static void audioSampleCallback(int16_t left, int16_t right);
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static void inputPollCallback();
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static int16_t inputStateCallback(unsigned port, unsigned device, unsigned index, unsigned id);
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static void logCallback(enum retro_log_level level, const char* fmt, ...);
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// Core function pointers (resolved via dlsym)
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void* core_handle_ = nullptr;
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retro_init_t core_init_ = nullptr;
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retro_deinit_t core_deinit_ = nullptr;
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retro_api_version_t core_api_version_ = nullptr;
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retro_get_system_info_t core_get_system_info_ = nullptr;
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retro_get_system_av_info_t core_get_system_av_info_ = nullptr;
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retro_set_environment_t core_set_environment_ = nullptr;
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retro_set_video_refresh_t core_set_video_refresh_ = nullptr;
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retro_set_audio_sample_t core_set_audio_sample_ = nullptr;
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retro_set_audio_sample_batch_t core_set_audio_sample_batch_ = nullptr;
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retro_set_input_poll_t core_set_input_poll_ = nullptr;
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retro_set_input_state_t core_set_input_state_ = nullptr;
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retro_set_controller_port_device_t core_set_controller_port_device_ = nullptr;
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retro_load_game_t core_load_game_ = nullptr;
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retro_unload_game_t core_unload_game_ = nullptr;
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retro_run_t core_run_ = nullptr;
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retro_reset_t core_reset_ = nullptr;
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retro_serialize_size_t core_serialize_size_ = nullptr;
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retro_serialize_t core_serialize_ = nullptr;
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retro_unserialize_t core_unserialize_ = nullptr;
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retro_get_memory_data_t core_get_memory_data_ = nullptr;
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retro_get_memory_size_t core_get_memory_size_ = nullptr;
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// State
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std::atomic<bool> running_{false};
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std::atomic<bool> paused_{false};
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std::atomic<bool> game_loaded_{false};
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std::thread emu_thread_;
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// Video
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ANativeWindow* window_ = nullptr;
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std::mutex window_mutex_;
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unsigned pixel_format_ = RETRO_PIXEL_FORMAT_RGB565;
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std::atomic<DisplayMode> display_mode_{DisplayMode::STRETCH};
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float core_aspect_ratio_ = 0.0f;
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unsigned core_base_width_ = 0;
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unsigned core_base_height_ = 0;
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// Audio
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AudioEngine audio_engine_;
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// Input
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std::atomic<uint16_t> button_state_{0};
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std::atomic<int16_t> analog_lx_{0}, analog_ly_{0};
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std::atomic<int16_t> analog_rx_{0}, analog_ry_{0};
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// Paths
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std::string system_dir_;
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std::string save_dir_;
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// Frame timing
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double target_fps_ = 60.0;
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int frame_skip_ = 0;
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// Core options
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std::unordered_map<std::string, std::string> core_options_;
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std::atomic<bool> options_updated_{false};
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};
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