Material generators from Afterlight (#18387)

Content.Shared/Power/Generator/SharedGeneratorSystem.cs

@@ -0,0 +1,19 @@
+namespace Content.Shared.Power.Generator;
+
+/// <summary>
+/// This handles small, portable generators that run off a material fuel.
+/// </summary>
+public abstract class SharedGeneratorSystem : EntitySystem
+{
+    /// <summary>
+    /// Calculates the expected fuel efficiency based on the optimal and target power levels.
+    /// </summary>
+    /// <param name="targetPower">Target power level</param>
+    /// <param name="optimalPower">Optimal power level</param>
+    /// <param name="component"></param>
+    /// <returns>Expected fuel efficiency as a percentage</returns>
+    public static float CalcFuelEfficiency(float targetPower, float optimalPower, FuelGeneratorComponent component)
+    {
+        return MathF.Pow(optimalPower / targetPower, component.FuelEfficiencyConstant);
+    }
+}