Backported vsync changes from new-netcode, WIP hull visibility culling

The hull culling functions are there, they just aren't being used right now because there are some annoying bugs.

Subsurface/Source/Map/Levels/WaterRenderer.cs

@@ -63,10 +63,7 @@ namespace Barotrauma
             waterEffect.Parameters["xWavePos"].SetValue(wavePos);
             waterEffect.Parameters["xBlurDistance"].SetValue(blurAmount);
             //waterEffect.CurrentTechnique.Passes[0].Apply();
-
-            wavePos.X += 0.0001f;
-            wavePos.Y += 0.0001f;
-
+            
 #if WINDOWS
             waterEffect.Parameters["xTexture"].SetValue(texture);
             spriteBatch.Draw(waterTexture, new Rectangle(0, 0, GameMain.GraphicsWidth, GameMain.GraphicsHeight), Color.White);
@@ -77,6 +74,12 @@ namespace Barotrauma
             spriteBatch.End();
         }
 
+        public void ScrollWater(float deltaTime)
+        {
+            wavePos.X += 0.006f * deltaTime;
+            wavePos.Y += 0.006f * deltaTime;
+        }
+
         public void Render(GraphicsDevice graphicsDevice, Camera cam, RenderTarget2D texture, Matrix transform)
         {
             if (vertices == null) return;