new eye damage effect (#10728)

Content.Client/Eye/Blinding/BlurryVisionOverlay.cs

@@ -14,15 +14,13 @@ namespace Content.Client.Eye.Blinding
 
         public override bool RequestScreenTexture => true;
         public override OverlaySpace Space => OverlaySpace.WorldSpace;
-        private readonly ShaderInstance _blurryVisionXShader;
-        private readonly ShaderInstance _blurryVisionYShader;
+        private readonly ShaderInstance _dim;
         private BlurryVisionComponent _blurryVisionComponent = default!;
 
         public BlurryVisionOverlay()
         {
             IoCManager.InjectDependencies(this);
-            _blurryVisionXShader = _prototypeManager.Index<ShaderPrototype>("BlurryVisionX").InstanceUnique();
-            _blurryVisionYShader = _prototypeManager.Index<ShaderPrototype>("BlurryVisionY").InstanceUnique();
+            _dim = _prototypeManager.Index<ShaderPrototype>("Dim").InstanceUnique();
         }
 
         protected override bool BeforeDraw(in OverlayDrawArgs args)
@@ -51,18 +49,17 @@ namespace Content.Client.Eye.Blinding
             if (ScreenTexture == null)
                 return;
 
-            _blurryVisionXShader?.SetParameter("SCREEN_TEXTURE", ScreenTexture);
-            _blurryVisionXShader?.SetParameter("BLUR_AMOUNT", (_blurryVisionComponent.Magnitude / 10));
-            _blurryVisionYShader?.SetParameter("SCREEN_TEXTURE", ScreenTexture);
-            _blurryVisionYShader?.SetParameter("BLUR_AMOUNT", (_blurryVisionComponent.Magnitude / 10));
+            var opacity = -(_blurryVisionComponent.Magnitude / 15) + 0.9f;
+
+            _dim.SetParameter("DAMAGE_AMOUNT", opacity);
 
             var worldHandle = args.WorldHandle;
             var viewport = args.WorldBounds;
+
+            worldHandle.UseShader(_dim);
             worldHandle.SetTransform(Matrix3.Identity);
-            worldHandle.UseShader(_blurryVisionXShader);
-            worldHandle.DrawRect(viewport, Color.White);
-            worldHandle.UseShader(_blurryVisionYShader);
-            worldHandle.DrawRect(viewport, Color.White);
+            worldHandle.DrawRect(viewport, Color.Black);
+            worldHandle.UseShader(null);
         }
     }
 }

Resources/Prototypes/Shaders/shaders.yml

@@ -65,3 +65,8 @@
   id: BlurryVisionY
   kind: source
   path: "/Textures/Shaders/blurryy.swsl"
+
+- type: shader
+  id: Dim
+  kind: source
+  path: "/Textures/Shaders/dim.swsl"

Resources/Textures/Shaders/dim.swsl

@@ -0,0 +1,12 @@
+uniform highp float DAMAGE_AMOUNT;
+
+void fragment() {
+
+     // Higher exponent -> stronger blinding effect
+
+     // Gradually mixes between the texture mix and a full-white texture, causing the "blinding" effect
+     highp vec4 mixed = mix(vec4(1.0, 1.0, 1.0, 1.0), vec4(1.0, 1.0, 1.0, 1.0), DAMAGE_AMOUNT);
+
+     COLOR = vec4(mixed.rgb, DAMAGE_AMOUNT);
+}
+