Duckstation/src/core/gpu_backend.h

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#pragma once
#include "common/event.h"
#include "common/heap_array.h"
#include "gpu_types.h"
#include <atomic>
#include <condition_variable>
#include <memory>
#include <mutex>
#include <thread>
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4324) // warning C4324: 'GPUBackend': structure was padded due to alignment specifier
#endif
class GPUBackend
{
public:
GPUBackend();
virtual ~GPUBackend();
ALWAYS_INLINE u16* GetVRAM() const { return m_vram_ptr; }
virtual bool Initialize(bool force_thread);
virtual void UpdateSettings();
virtual void Reset(bool clear_vram);
virtual void Shutdown();
GPUBackendFillVRAMCommand* NewFillVRAMCommand();
GPUBackendUpdateVRAMCommand* NewUpdateVRAMCommand(u32 num_words);
GPUBackendCopyVRAMCommand* NewCopyVRAMCommand();
GPUBackendSetDrawingAreaCommand* NewSetDrawingAreaCommand();
GPUBackendDrawPolygonCommand* NewDrawPolygonCommand(u32 num_vertices);
GPUBackendDrawRectangleCommand* NewDrawRectangleCommand();
GPUBackendDrawLineCommand* NewDrawLineCommand(u32 num_vertices);
void PushCommand(GPUBackendCommand* cmd);
void Sync(bool allow_sleep);
/// Processes all pending GPU commands.
void RunGPULoop();
protected:
void* AllocateCommand(GPUBackendCommandType command, u32 size);
u32 GetPendingCommandSize() const;
void WakeGPUThread();
void StartGPUThread();
void StopGPUThread();
virtual void FillVRAM(u32 x, u32 y, u32 width, u32 height, u32 color, GPUBackendCommandParameters params) = 0;
virtual void UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data,
GPUBackendCommandParameters params) = 0;
virtual void CopyVRAM(u32 src_x, u32 src_y, u32 dst_x, u32 dst_y, u32 width, u32 height,
GPUBackendCommandParameters params) = 0;
virtual void DrawPolygon(const GPUBackendDrawPolygonCommand* cmd) = 0;
virtual void DrawRectangle(const GPUBackendDrawRectangleCommand* cmd) = 0;
virtual void DrawLine(const GPUBackendDrawLineCommand* cmd) = 0;
virtual void FlushRender() = 0;
virtual void DrawingAreaChanged() = 0;
void HandleCommand(const GPUBackendCommand* cmd);
u16* m_vram_ptr = nullptr;
Common::Rectangle<u32> m_drawing_area{};
Common::Event m_sync_event;
std::atomic_bool m_gpu_thread_sleeping{false};
std::atomic_bool m_gpu_loop_done{false};
std::thread m_gpu_thread;
bool m_use_gpu_thread = false;
std::mutex m_sync_mutex;
std::condition_variable m_sync_cpu_thread_cv;
std::condition_variable m_wake_gpu_thread_cv;
bool m_sync_done = false;
enum : u32
{
COMMAND_QUEUE_SIZE = 4 * 1024 * 1024,
THRESHOLD_TO_WAKE_GPU = 256
};
HeapArray<u8, COMMAND_QUEUE_SIZE> m_command_fifo_data;
alignas(64) std::atomic<u32> m_command_fifo_read_ptr{0};
alignas(64) std::atomic<u32> m_command_fifo_write_ptr{0};
};
#ifdef _MSC_VER
#pragma warning(pop)
#endif