(Ebent) Forcefields

Content.Client/SS220/ForcefieldGenerator/ForcefieldOverlay.cs

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+// © SS220, An EULA/CLA with a hosting restriction, full text: https://raw.githubusercontent.com/SerbiaStrong-220/space-station-14/master/CLA.txt
+using System.Numerics;
+using Content.Shared.SS220.ForcefieldGenerator;
+using Robust.Client.Graphics;
+using Robust.Shared.Enums;
+using Robust.Shared.Prototypes;
+
+namespace Content.Client.SS220.ForcefieldGenerator;
+
+public sealed class ForcefieldOverlay : Overlay
+{
+    private EntityManager _entity;
+    private SharedTransformSystem _transform;
+    private IPrototypeManager _prototype = default!;
+
+    public override OverlaySpace Space => OverlaySpace.WorldSpaceEntities;
+    public override bool RequestScreenTexture => true;
+
+    private readonly ShaderInstance _shader;
+    private readonly ShaderInstance _shader_unshaded;
+
+    public ForcefieldOverlay(EntityManager entMan, IPrototypeManager protoMan)
+    {
+        _entity = entMan;
+        _transform = entMan.EntitySysManager.GetEntitySystem<SharedTransformSystem>();
+        _prototype = protoMan;
+        _shader_unshaded = _prototype.Index<ShaderPrototype>("unshaded").InstanceUnique();
+        _shader = _prototype.Index<ShaderPrototype>("Stealth").InstanceUnique();
+
+        ZIndex = (int) Shared.DrawDepth.DrawDepth.Overdoors;
+    }
+
+    protected override void Draw(in OverlayDrawArgs args)
+    {
+        if (ScreenTexture == null)
+            return;
+
+        var handle = args.WorldHandle;
+        var queryEnum = _entity.EntityQueryEnumerator<ForcefieldSS220Component>();
+
+        while (queryEnum.MoveNext(out var uid, out var fieldComp))
+        {
+            if (fieldComp.Generator is not { } generator || !_entity.EntityExists(generator))
+            {
+                continue;
+            }
+
+            if (!_entity.TryGetComponent<ForcefieldGeneratorSS220Component>(generator, out var generatorComp))
+            {
+                continue;
+            }
+
+            var boxToRender = new Box2(
+                new Vector2(-generatorComp.FieldLength / 2, -generatorComp.FieldThickness / 2),
+                new Vector2(generatorComp.FieldLength / 2, generatorComp.FieldThickness / 2)
+            );
+
+            var (position, rotation) = _transform.GetWorldPositionRotation(uid);
+
+            var reference = args.Viewport.WorldToLocal(position);
+            reference.X = -reference.X;
+
+            _shader.SetParameter("SCREEN_TEXTURE", ScreenTexture);
+            _shader.SetParameter("reference", reference);
+            var finalVisibility = Math.Clamp(generatorComp.FieldVisibility, -1f, 1f);
+            _shader.SetParameter("visibility", finalVisibility);
+
+            handle.SetTransform(position, rotation);
+            handle.UseShader(_shader);
+            handle.DrawRect(boxToRender, generatorComp.FieldColor);
+        }
+
+        handle.UseShader(null);
+        handle.SetTransform(Matrix3.Identity);
+    }
+}

Content.Client/SS220/ForcefieldGenerator/ForcefieldOverlaySystem.cs

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+// © SS220, An EULA/CLA with a hosting restriction, full text: https://raw.githubusercontent.com/SerbiaStrong-220/space-station-14/master/CLA.txt
+using Robust.Client.Graphics;
+using Robust.Shared.Prototypes;
+
+namespace Content.Client.SS220.ForcefieldGenerator;
+
+public sealed class ForcefieldOverlaySystem : EntitySystem
+{
+    [Dependency] private readonly IOverlayManager _overlayManager = default!;
+    [Dependency] private readonly IPrototypeManager _prototype = default!;
+
+    private ForcefieldOverlay _overlay = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        _overlay = new(this.EntityManager, _prototype);
+        _overlayManager.AddOverlay(_overlay);
+    }
+
+    public override void Shutdown()
+    {
+        base.Shutdown();
+        _overlayManager.RemoveOverlay(_overlay);
+    }
+}