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// Copyright 2019 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <atomic>
#include <condition_variable>
#include <memory>
#include <mutex>
#include <optional>
#include <thread>
#include <variant>
namespace Tegra {
struct FramebufferConfig;
class DmaPusher;
} // namespace Tegra
namespace VideoCore {
class RendererBase;
} // namespace VideoCore
namespace VideoCommon::GPUThread {
/// Command to signal to the GPU thread that a command list is ready for processing
struct SubmitListCommand final {
explicit SubmitListCommand(Tegra::CommandList&& entries) : entries{std::move(entries)} {}
Tegra::CommandList entries;
};
/// Command to signal to the GPU thread that a swap buffers is pending
struct SwapBuffersCommand final {
explicit SwapBuffersCommand(std::optional<const Tegra::FramebufferConfig> framebuffer)
: framebuffer{std::move(framebuffer)} {}
std::optional<const Tegra::FramebufferConfig> framebuffer;
};
/// Command to signal to the GPU thread to flush a region
struct FlushRegionCommand final {
explicit constexpr FlushRegionCommand(VAddr addr, u64 size) : addr{addr}, size{size} {}
const VAddr addr;
const u64 size;
};
/// Command to signal to the GPU thread to invalidate a region
struct InvalidateRegionCommand final {
explicit constexpr InvalidateRegionCommand(VAddr addr, u64 size) : addr{addr}, size{size} {}
const VAddr addr;
const u64 size;
};
/// Command to signal to the GPU thread to flush and invalidate a region
struct FlushAndInvalidateRegionCommand final {
explicit constexpr FlushAndInvalidateRegionCommand(VAddr addr, u64 size)
: addr{addr}, size{size} {}
const VAddr addr;
const u64 size;
};
using CommandData = std::variant<SubmitListCommand, SwapBuffersCommand, FlushRegionCommand,
InvalidateRegionCommand, FlushAndInvalidateRegionCommand>;
/// Struct used to synchronize the GPU thread
struct SynchState final {
std::atomic<bool> is_running{true};
std::atomic<bool> is_idle{true};
std::condition_variable signal_condition;
std::mutex signal_mutex;
std::condition_variable idle_condition;
std::mutex idle_mutex;
// We use two queues for sending commands to the GPU thread, one for writing (push_queue) to and
// one for reading from (pop_queue). These are swapped whenever the current pop_queue becomes
// empty. This allows for efficient thread-safe access, as it does not require any copies.
using CommandQueue = std::queue<CommandData>;
std::array<CommandQueue, 2> command_queues;
CommandQueue* push_queue{&command_queues[0]};
CommandQueue* pop_queue{&command_queues[1]};
void UpdateIdleState() {
std::lock_guard<std::mutex> lock{idle_mutex};
is_idle = command_queues[0].empty() && command_queues[1].empty();
}
};
/// Class used to manage the GPU thread
class ThreadManager final {
public:
explicit ThreadManager(VideoCore::RendererBase& renderer, Tegra::DmaPusher& dma_pusher);
~ThreadManager();
/// Push GPU command entries to be processed
void SubmitList(Tegra::CommandList&& entries);
/// Swap buffers (render frame)
void SwapBuffers(
std::optional<std::reference_wrapper<const Tegra::FramebufferConfig>> framebuffer);
/// Notify rasterizer that any caches of the specified region should be flushed to Switch memory
void FlushRegion(VAddr addr, u64 size);
/// Notify rasterizer that any caches of the specified region should be invalidated
void InvalidateRegion(VAddr addr, u64 size);
/// Notify rasterizer that any caches of the specified region should be flushed and invalidated
void FlushAndInvalidateRegion(VAddr addr, u64 size);
/// Waits the caller until the GPU thread is idle, used for synchronization
void WaitForIdle();
private:
/// Pushes a command to be executed by the GPU thread
void PushCommand(CommandData&& command_data, bool wait_for_idle, bool allow_on_cpu);
/// Returns true if this is called by the GPU thread
bool IsGpuThread() const {
return std::this_thread::get_id() == thread_id;
}
private:
SynchState state;
std::thread thread;
std::thread::id thread_id;
VideoCore::RendererBase& renderer;
Tegra::DmaPusher& dma_pusher;
};
} // namespace VideoCommon::GPUThread
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