141 lines
3.7 KiB
C++
141 lines
3.7 KiB
C++
/* Copyright (c) 2017-2022 Hans-Kristian Arntzen
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#pragma once
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#include "vulkan_headers.hpp"
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#include <vector>
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namespace Vulkan
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{
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enum class LatencyLimiter
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{
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None,
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AdaptiveLowLatency,
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IdealPipeline
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};
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struct WSITimingOptions
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{
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uint32_t swap_interval = 1;
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LatencyLimiter latency_limiter = LatencyLimiter::None;
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bool adaptive_swap_interval = false;
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bool debug = false;
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};
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class WSIPlatform;
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class Device;
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class WSITiming
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{
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public:
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void init(WSIPlatform *platform, Device *device, VkSwapchainKHR swapchain, const WSITimingOptions &options = {});
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void begin_frame(double &frame_time, double &elapsed_time);
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bool fill_present_info_timing(VkPresentTimeGOOGLE &time);
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double get_current_latency() const;
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void set_swap_interval(unsigned interval);
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void set_debug_enable(bool enable);
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void set_latency_limiter(LatencyLimiter limiter);
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// Can return 0 if we don't know the refresh interval yet.
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uint64_t get_refresh_interval() const;
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const WSITimingOptions &get_options() const;
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private:
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WSIPlatform *platform = nullptr;
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VkDevice device = VK_NULL_HANDLE;
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const VolkDeviceTable *table = nullptr;
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VkSwapchainKHR swapchain = VK_NULL_HANDLE;
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WSITimingOptions options;
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enum { NUM_TIMINGS = 32, NUM_TIMING_MASK = NUM_TIMINGS - 1 };
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struct Serial
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{
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uint32_t serial = 0;
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} serial_info;
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enum class TimingResult
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{
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Unknown,
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VeryEarly,
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TooLate,
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Expected
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};
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struct Timing
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{
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uint32_t wall_serial = 0;
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uint64_t wall_frame_begin = 0;
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uint64_t wall_frame_target = 0;
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uint32_t swap_interval_target = 0;
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TimingResult result = TimingResult::Unknown;
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int64_t slack = 0;
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int64_t pipeline_latency = 0;
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VkPastPresentationTimingGOOGLE timing = {};
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};
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struct Feedback
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{
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uint64_t refresh_interval = 0;
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Timing past_timings[NUM_TIMINGS];
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std::vector<VkPastPresentationTimingGOOGLE> timing_buffer;
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double latency = 0.0;
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} feedback;
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struct Pacing
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{
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uint32_t base_serial = 0;
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uint64_t base_present = 0;
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bool have_estimate = false;
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bool have_real_estimate = false;
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} pacing;
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struct FrameTimer
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{
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uint64_t present_time = 0;
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uint64_t serial = 0;
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} last_frame;
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struct SmoothTimer
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{
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double elapsed = 0.0;
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double offset = 0.0;
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} smoothing;
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uint64_t compute_target_present_time_for_serial(uint32_t serial);
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uint64_t get_wall_time();
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void update_past_presentation_timing();
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Timing *find_latest_timestamp(uint32_t start_serial);
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void update_frame_pacing(uint32_t id, uint64_t present_time, bool wall_time);
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void update_refresh_interval();
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void update_frame_time_smoothing(double &frame_time, double &elapsed_time);
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bool get_conservative_latency(int64_t &latency) const;
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void wait_until(int64_t nsecs);
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void limit_latency(Timing &new_timing);
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void promote_or_demote_frame_rate();
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};
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}
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