Adjusting how deadzones are calculated (#3079)

* Making deadzones feel nice and smooth + adding rider files to .gitignore

* removing unnecessary parentheses and fixing possibility of divide by 0

* formatting :)

* fixing up ClampAxis

* fixing up ClampAxis

.gitignore

@@ -74,6 +74,9 @@ _TeamCity*
 # DotCover is a Code Coverage Tool
 *.dotCover
 
+# Rider is a Visual Studio alternative
+.idea/*
+
 # NCrunch
 *.ncrunch*
 .*crunch*.local.xml

Ryujinx.Input/HLE/NpadController.cs

@@ -391,24 +391,29 @@ namespace Ryujinx.Input.HLE
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static JoystickPosition ApplyDeadzone(float x, float y, float deadzone)
         {
-            return new JoystickPosition
+            float magnitudeClamped = Math.Min(MathF.Sqrt(x * x + y * y), 1f);
+            
+            if (magnitudeClamped <= deadzone)
+            {
+                return new JoystickPosition() {Dx = 0, Dy = 0};
+            }
+            
+            return new JoystickPosition()
             {
-                Dx = ClampAxis(MathF.Abs(x) > deadzone ? x : 0.0f),
-                Dy = ClampAxis(MathF.Abs(y) > deadzone ? y : 0.0f)
+                Dx = ClampAxis((x / magnitudeClamped) * ((magnitudeClamped - deadzone) / (1 - deadzone))),
+                Dy = ClampAxis((y / magnitudeClamped) * ((magnitudeClamped - deadzone) / (1 - deadzone)))
             };
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         private static short ClampAxis(float value)
         {
-            if (value <= -short.MaxValue)
+            if (Math.Sign(value) < 0)
             {
-                return -short.MaxValue;
-            }
-            else
-            {
-                return (short)(value * short.MaxValue);
+                return (short)Math.Max(value * -short.MinValue, short.MinValue);
             }
+
+            return (short)Math.Min(value * short.MaxValue, short.MaxValue);
         }
 
         [MethodImpl(MethodImplOptions.AggressiveInlining)]