add initial project files and configurations, including EventBus, systems, and resources

Code/Systems/TunnelSystem.cs

@@ -0,0 +1,65 @@
+using Godot;
+using MaxEffort.Code.Core;
+using MaxEffort.Code.Data;
+
+namespace MaxEffort.Code.Systems;
+
+[GlobalClass]
+public partial class TunnelSystem : Node
+{
+    [Export] private TunnelConfig _config;
+    [Export] private ColorRect _vignetteOverlay;
+    
+    private float _currentFocus = 0f;
+    private bool _isEfforting = false;
+    
+    public override void _Ready()
+    {
+        EventBus.OnLiftEffortApplied += HandleEffort;
+        EventBus.OnFocusRelease += HandleRelease;
+    }
+
+    public override void _ExitTree()
+    {
+        EventBus.OnLiftEffortApplied -= HandleEffort;
+        EventBus.OnFocusRelease -= HandleRelease;
+    }
+
+    public override void _Process(double delta)
+    {
+        var dt = (float)delta;
+        
+        if (_isEfforting)
+        {
+            _currentFocus += _config.VisionNarrowRate * dt;
+        }
+        else
+        {
+            _currentFocus -= _config.VisionRecoverRate * dt;
+        }
+        
+        _currentFocus = Mathf.Clamp(_currentFocus, 0f, _config.MaxTunnelIntensity);
+
+        var visualValue = _config.VisionCurve?.Sample(_currentFocus) ?? _currentFocus;
+
+        if (_vignetteOverlay != null)
+        {
+            var mat = _vignetteOverlay.Material as ShaderMaterial;
+            mat?.SetShaderParameter("vignette_intensity", visualValue);
+        }
+        
+        EventBus.PublishFocusChanged(_currentFocus);
+
+        _isEfforting = false;
+    }
+
+    private void HandleRelease()
+    {
+     _isEfforting = false;
+    }
+
+    private void HandleEffort(float effortDelta)
+    {
+        _isEfforting = true;
+    }
+}