Emil_Shanaty/Cortex_Engine
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fix: fixed 60 FPS render rate, uncapped physics/input

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- Physics + input + light animation: run at full speed every iteration
- Render: accumulator-based 60 FPS limiter — only renders when enough
  time has accumulated (16.67ms). If not, Thread.Sleep(1) and continue.
- Video: captured at exactly 60 FPS, FFmpeg downsamples to 30
- Physics stays smooth even if render can't keep up
This commit is contained in:
emil28092005
2026-06-19 09:27:42 +03:00
parent e3b2cab9f0
commit f2ae4d0f8f
1 changed files with 37 additions and 33 deletions
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src/CortexEngine.App/Program.cs
+37 -33
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@@ -79,24 +79,16 @@ class Program
string? recordingPath = null;
int recordedFrames = 0;
const double targetFps = 60.0;
var targetFrameTime = 1.0 / targetFps;
var lastFrameTime = 0.0;
const double renderFps = 60.0;
var renderFrameTime = 1.0 / renderFps;
var renderAccumulator = 0.0;
while (!window.ShouldClose)
{
timing.Tick();
var now = timing.TotalTime;
var elapsed = now - lastFrameTime;
if (elapsed < targetFrameTime)
{
var sleepMs = (int)((targetFrameTime - elapsed) * 1000);
if (sleepMs > 0) Thread.Sleep(sleepMs);
timing.Tick();
now = timing.TotalTime;
}
lastFrameTime = now;
renderAccumulator += timing.DeltaTime;
// Physics + input run at full speed (uncapped)
window.PumpEvents();
input.BeginFrame();
@@ -396,32 +388,44 @@ class Program
renderer.EndImGuiFrame();
}
// Set recording flag before render so renderer can capture
vkRenderer!.IsRecording = isRecording;
renderer.RenderWorld(world);
queue.CompletePendingScreenshots();
// If recording, get captured frame and write to FFmpeg
if (isRecording && ffmpegProcess != null && !ffmpegProcess.HasExited)
// Fixed render rate: 60 FPS
renderAccumulator -= renderFrameTime;
if (renderAccumulator >= 0)
{
var frameData = vkRenderer.CapturedFrame;
if (frameData != null && frameData.Length > 0)
// Set recording flag before render so renderer can capture
vkRenderer!.IsRecording = isRecording;
renderer.RenderWorld(world);
queue.CompletePendingScreenshots();
// If recording, get captured frame and write to FFmpeg
if (isRecording && ffmpegProcess != null && !ffmpegProcess.HasExited)
{
try
var frameData = vkRenderer.CapturedFrame;
if (frameData != null && frameData.Length > 0)
{
ffmpegProcess.StandardInput.BaseStream.Write(frameData, 0, frameData.Length);
ffmpegProcess.StandardInput.BaseStream.Flush();
recordedFrames++;
}
catch (Exception ex)
{
Console.WriteLine($"[App] FFmpeg write error: {ex.Message}");
isRecording = false;
try
{
ffmpegProcess.StandardInput.BaseStream.Write(frameData, 0, frameData.Length);
ffmpegProcess.StandardInput.BaseStream.Flush();
recordedFrames++;
}
catch (Exception ex)
{
Console.WriteLine($"[App] FFmpeg write error: {ex.Message}");
isRecording = false;
}
}
}
}
frames++;
frames++;
}
else
{
// Not enough time for a render frame — sleep briefly
Thread.Sleep(1);
continue;
}
if (timing.TotalTime - lastFpsTime >= 1.0)
{
Console.WriteLine($"FPS: {frames}, Delta: {timing.DeltaTime * 1000.0:F2} ms");