Fix render target caching in overlays (#40181)

Many newer overlays use IRenderTextures that are sized to the rendered viewport. This was completely broken, because a single viewport can be rendered on multiple viewports in a single frame.

The end result of this was that in the better case, constant render targets were allocated and freed, which is  extremely inefficient. In the worse case, many of these overlays completely failed to Dispose() their render targets, leading to *extremely* swift VRAM OOMs.

This fixes all the overlays to properly cache resources per viewport. This uses new engine functionality, so it requires engine master.

This is still a pretty lousy way to do GPU resource management but, well, anything better needs a render graph, so...

Content.Client/Overlays/StencilOverlay.Weather.cs

@@ -11,7 +11,12 @@ public sealed partial class StencilOverlay
 {
     private List<Entity<MapGridComponent>> _grids = new();
 
-    private void DrawWeather(in OverlayDrawArgs args, WeatherPrototype weatherProto, float alpha, Matrix3x2 invMatrix)
+    private void DrawWeather(
+        in OverlayDrawArgs args,
+        CachedResources res,
+        WeatherPrototype weatherProto,
+        float alpha,
+        Matrix3x2 invMatrix)
     {
         var worldHandle = args.WorldHandle;
         var mapId = args.MapId;
@@ -22,7 +27,7 @@ public sealed partial class StencilOverlay
         // Cut out the irrelevant bits via stencil
         // This is why we don't just use parallax; we might want specific tiles to get drawn over
         // particularly for planet maps or stations.
-        worldHandle.RenderInRenderTarget(_blep!, () =>
+        worldHandle.RenderInRenderTarget(res.Blep!, () =>
         {
             var xformQuery = _entManager.GetEntityQuery<TransformComponent>();
             _grids.Clear();
@@ -56,7 +61,7 @@ public sealed partial class StencilOverlay
 
         worldHandle.SetTransform(Matrix3x2.Identity);
         worldHandle.UseShader(_protoManager.Index(StencilMask).Instance());
-        worldHandle.DrawTextureRect(_blep!.Texture, worldBounds);
+        worldHandle.DrawTextureRect(res.Blep!.Texture, worldBounds);
         var curTime = _timing.RealTime;
         var sprite = _sprite.GetFrame(weatherProto.Sprite, curTime);