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96 lines
3.1 KiB
C++
96 lines
3.1 KiB
C++
// SPDX-FileCopyrightText: 2019-2022 Connor McLaughlin <stenzek@gmail.com>
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// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
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#pragma once
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#include "common/heap_array.h"
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#include "common/threading.h"
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#include "gpu_types.h"
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#include <atomic>
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#include <condition_variable>
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#include <memory>
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#include <mutex>
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#include <thread>
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable : 4324) // warning C4324: 'GPUBackend': structure was padded due to alignment specifier
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#endif
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class GPUBackend
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{
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public:
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GPUBackend();
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virtual ~GPUBackend();
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ALWAYS_INLINE u16* GetVRAM() const { return m_vram_ptr; }
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ALWAYS_INLINE const Threading::Thread* GetThread() const { return m_use_gpu_thread ? &m_gpu_thread : nullptr; }
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virtual bool Initialize(bool force_thread);
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virtual void UpdateSettings();
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virtual void Reset(bool clear_vram);
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virtual void Shutdown();
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GPUBackendFillVRAMCommand* NewFillVRAMCommand();
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GPUBackendUpdateVRAMCommand* NewUpdateVRAMCommand(u32 num_words);
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GPUBackendCopyVRAMCommand* NewCopyVRAMCommand();
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GPUBackendSetDrawingAreaCommand* NewSetDrawingAreaCommand();
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GPUBackendDrawPolygonCommand* NewDrawPolygonCommand(u32 num_vertices);
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GPUBackendDrawRectangleCommand* NewDrawRectangleCommand();
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GPUBackendDrawLineCommand* NewDrawLineCommand(u32 num_vertices);
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void PushCommand(GPUBackendCommand* cmd);
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void Sync(bool allow_sleep);
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/// Processes all pending GPU commands.
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void RunGPULoop();
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protected:
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void* AllocateCommand(GPUBackendCommandType command, u32 size);
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u32 GetPendingCommandSize() const;
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void WakeGPUThread();
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void StartGPUThread();
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void StopGPUThread();
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virtual void FillVRAM(u32 x, u32 y, u32 width, u32 height, u32 color, GPUBackendCommandParameters params) = 0;
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virtual void UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data,
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GPUBackendCommandParameters params) = 0;
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virtual void CopyVRAM(u32 src_x, u32 src_y, u32 dst_x, u32 dst_y, u32 width, u32 height,
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GPUBackendCommandParameters params) = 0;
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virtual void DrawPolygon(const GPUBackendDrawPolygonCommand* cmd) = 0;
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virtual void DrawRectangle(const GPUBackendDrawRectangleCommand* cmd) = 0;
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virtual void DrawLine(const GPUBackendDrawLineCommand* cmd) = 0;
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virtual void FlushRender() = 0;
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virtual void DrawingAreaChanged() = 0;
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void HandleCommand(const GPUBackendCommand* cmd);
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u16* m_vram_ptr = nullptr;
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Common::Rectangle<u32> m_drawing_area{};
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Threading::KernelSemaphore m_sync_semaphore;
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std::atomic_bool m_gpu_thread_sleeping{false};
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std::atomic_bool m_gpu_loop_done{false};
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Threading::Thread m_gpu_thread;
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bool m_use_gpu_thread = false;
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std::mutex m_sync_mutex;
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std::condition_variable m_sync_cpu_thread_cv;
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std::condition_variable m_wake_gpu_thread_cv;
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bool m_sync_done = false;
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enum : u32
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{
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COMMAND_QUEUE_SIZE = 4 * 1024 * 1024,
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THRESHOLD_TO_WAKE_GPU = 256
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};
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FixedHeapArray<u8, COMMAND_QUEUE_SIZE> m_command_fifo_data;
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alignas(64) std::atomic<u32> m_command_fifo_read_ptr{0};
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alignas(64) std::atomic<u32> m_command_fifo_write_ptr{0};
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};
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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