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Fix inconsistencies with the FPS scheduler (#241)

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The current Fps manager will sometime skip the intended delay and start
the next frame immediately, I'm not 100% sure why it happens, but I
rewrote most of it to stay consistent and improved the overall precision
by compensating for OS wake delay after sleep and finishing with a busy
wait
I also changed the behavior of mlx_set_fps_goal to allow zero/negative
values and treat them as uncapped (like most graphics libraries)
This commit is contained in:
Daemo
2026-08-08 15:45:56 +02:00
committed by GitHub
parent c9df651a14
commit 63fe3088bf
4 changed files with 43 additions and 34 deletions
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runtime/Includes/Core/Fps.h
+12 -8
View File
@@ -1,26 +1,30 @@
#ifndef __MLX_FPS__
#define __MLX_FPS__
#include <chrono>
namespace mlx
{
typedef std::chrono::steady_clock fps_clock;
class FpsManager
{
public:
FpsManager() = default;
void Init();
bool Update();
inline void SetMaxFPS(std::uint32_t fps) noexcept { m_max_fps = fps; m_ns = 1000000000.0 / fps; }
void WaitUntilNextFrame();
inline void SetMaxFPS(std::uint32_t fps) noexcept { m_target_delta = fps_clock::duration(std::chrono::seconds(1)) / fps;}
~FpsManager() = default;
private:
double m_ns = 1000000000.0 / 1'337'000.0;
std::int64_t m_fps_before = 0;
std::int64_t m_fps_now = 0;
std::int64_t m_timer = 0;
std::uint32_t m_max_fps = 1'337'000;
std::uint32_t m_fps_elapsed_time = 0;
fps_clock::time_point m_current_time;
fps_clock::time_point m_target_time;
fps_clock::time_point m_last_time_record;
fps_clock::duration m_delta_time = fps_clock::duration().zero();
fps_clock::duration m_target_delta = fps_clock::duration().zero();
fps_clock::duration m_sleep_margin = std::chrono::microseconds(200);
};
}