mirror of https://github.com/PCSX2/pcsx2.git
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
// SPDX-FileCopyrightText: 2002-2023 PCSX2 Dev Team
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// SPDX-License-Identifier: LGPL-3.0+
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#pragma once
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#include "Pcsx2Defs.h"
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#include <vector>
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/// A class for calculating optimal spin values to trick OSes into not powering down GPUs while waiting for readbacks
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class ReadbackSpinManager
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{
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public:
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struct Event
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{
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s64 size;
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u32 begin;
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u32 end;
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};
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private:
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double m_spins_per_unit_time = 0;
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double m_total_spin_time = 0;
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double m_total_spin_cycles = 0;
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std::vector<Event> m_frames[3];
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u32 m_current_frame = 0;
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u32 m_reference_frame = 0;
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u32 m_reference_frame_idx = 0;
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public:
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struct DrawSubmittedReturn
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{
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u32 id;
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u32 recommended_spin;
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};
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/// Call when a readback is requested
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void ReadbackRequested();
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/// Call at the end of a frame
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void NextFrame();
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/// Call when a command buffer is submitted to the GPU
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/// `size` is used to attempt to find patterns in submissions, and can be any metric that approximates the amount of work in a submission (draw calls, command encoders, etc)
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/// Returns an id to be passed to `DrawCompleted`, and the recommended number of spin cycles to perform on the GPU in order to keep it busy
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DrawSubmittedReturn DrawSubmitted(u64 size);
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/// Call once a draw has been finished by the GPU and you have begin/end data for it
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/// `begin_time` and `end_time` can be in any unit as long as it's consistent. It's okay if they roll over, as long as it happens less than once every few frames.
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void DrawCompleted(u32 id, u32 begin_time, u32 end_time);
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/// Call when a spin completes to help the manager figure out how quickly your GPU spins
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void SpinCompleted(u32 cycles, u32 begin_time, u32 end_time);
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/// Get the calculated number of spins per unit of time
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/// Note: May be zero when there's insufficient data
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double SpinsPerUnitTime() const { return m_spins_per_unit_time; }
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};
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