- The emission rate of ParticleEmitters can be set as particles per second (instead of particles per frame).

- Particles that are outside the sub aren't visible inside hulls even if they overlap with the sub.
- ParticleManager takes the movement of the particles into account when determining which particles to cull. For example, a particle that will move upwards can be emitted even if it's below the camera view.

Barotrauma/BarotraumaClient/Source/Characters/Attack.cs

@@ -8,7 +8,7 @@ namespace Barotrauma
     {
         private Sound sound;
 
-        private ParticleEmitterPrefab particleEmitterPrefab;
+        private ParticleEmitter particleEmitterPrefab;
 
         partial void InitProjSpecific(XElement element)
         {
@@ -23,18 +23,18 @@ namespace Barotrauma
                 switch (subElement.Name.ToString().ToLowerInvariant())
                 {
                     case "particleemitter":
-                        particleEmitterPrefab = new ParticleEmitterPrefab(subElement);
+                        particleEmitterPrefab = new ParticleEmitter(subElement);
                         break;
                 }
 
             }
         }
 
-        partial void DamageParticles(Vector2 worldPosition)
+        partial void DamageParticles(float deltaTime, Vector2 worldPosition)
         {
             if (particleEmitterPrefab != null)
             {
-                particleEmitterPrefab.Emit(worldPosition);
+                particleEmitterPrefab.Emit(deltaTime, worldPosition);
             }
 
             if (sound != null)

Barotrauma/BarotraumaClient/Source/Map/Lights/LightManager.cs

@@ -159,7 +159,7 @@ namespace Barotrauma.Lights
 
             lightEffect.World = Matrix.CreateTranslation(offset) * transform;
                         
-            GameMain.ParticleManager.Draw(spriteBatch, false, Particles.ParticleBlendState.Additive);
+            GameMain.ParticleManager.Draw(spriteBatch, false, null, Particles.ParticleBlendState.Additive);
 
             if (Character.Controlled != null)
             {

Barotrauma/BarotraumaClient/Source/Particles/Particle.cs

@@ -74,6 +74,11 @@ namespace Barotrauma.Particles
             set { velocity = value; }
         }
 
+        public Hull CurrentHull
+        {
+            get { return currentHull; }
+        }
+        
         public void Init(ParticlePrefab prefab, Vector2 position, Vector2 speed, float rotation, Hull hullGuess = null)
         {
             this.prefab = prefab;

Barotrauma/BarotraumaClient/Source/Particles/ParticleEmitter.cs

@@ -4,7 +4,7 @@ using System.Xml.Linq;
 
 namespace Barotrauma.Particles
 {
-    class ParticleEmitterPrefab
+    class ParticleEmitter
     {        
         public readonly string Name;
 
@@ -16,9 +16,13 @@ namespace Barotrauma.Particles
 
         public readonly float ScaleMin, ScaleMax;
         
-        public readonly float ParticleAmount;
+        public readonly int ParticleAmount;
 
-        public ParticleEmitterPrefab(XElement element)
+        public readonly float ParticlesPerSecond;
+        
+        private float emitTimer;
+
+        public ParticleEmitter(XElement element)
         {
             Name = element.Name.ToString();
 
@@ -60,12 +64,31 @@ namespace Barotrauma.Particles
                 VelocityMax = VelocityMin;
             }
 
-            ParticleAmount = ToolBox.GetAttributeInt(element, "particleamount", 1);
+            ParticlesPerSecond = ToolBox.GetAttributeInt(element, "particlespersecond", 0);
+            ParticleAmount = ToolBox.GetAttributeInt(element, "particleamount", 0);
         }
 
-        public void Emit(Vector2 position, Hull hullGuess = null)
+        public void Emit(float deltaTime, Vector2 position, Hull hullGuess = null)
         {
+            emitTimer += deltaTime;
+            
+            if (ParticlesPerSecond > 0)
+            {
+                float emitInterval = 1.0f / ParticlesPerSecond;
+                while (emitTimer > emitInterval)
+                {
+                    Emit(position, hullGuess);
+                    emitTimer -= emitInterval;
+                }
+            }
+
             for (int i = 0; i<ParticleAmount; i++)
+            {
+                Emit(position, hullGuess);
+            }
+        }
+
+        private void Emit(Vector2 position, Hull hullGuess = null)
         {
             float angle = Rand.Range(AngleMin, AngleMax);
             Vector2 velocity = new Vector2((float)Math.Cos(angle), (float)Math.Sin(angle)) * Rand.Range(VelocityMin, VelocityMax);
@@ -79,4 +102,3 @@ namespace Barotrauma.Particles
         }
     }
 }
-}

Barotrauma/BarotraumaClient/Source/Particles/ParticleManager.cs

@@ -66,11 +66,19 @@ namespace Barotrauma.Particles
 
         public Particle CreateParticle(ParticlePrefab prefab, Vector2 position, Vector2 speed, float rotation = 0.0f, Hull hullGuess = null)
         {
-            if (!Submarine.RectContains(MathUtils.ExpandRect(cam.WorldView, MaxOutOfViewDist), position)) return null;
-            //if (!cam.WorldView.Contains(position)) return null;
-
             if (particleCount >= MaxParticles) return null;
 
+            //endPos = x + vt + 1/2 * at^2
+            Vector2 particleEndPos = position + speed * prefab.LifeTime + 0.5f * prefab.VelocityChange * prefab.LifeTime * prefab.LifeTime;
+
+            Vector2 minPos = new Vector2(Math.Min(position.X, particleEndPos.X), Math.Min(position.Y, particleEndPos.Y));
+            Vector2 maxPos = new Vector2(Math.Max(position.X, particleEndPos.X), Math.Max(position.Y, particleEndPos.Y));
+
+            Rectangle expandedViewRect = MathUtils.ExpandRect(cam.WorldView, MaxOutOfViewDist);
+
+            if (minPos.X > expandedViewRect.Right || maxPos.X < expandedViewRect.X) return null;
+            if (minPos.Y > expandedViewRect.Y || maxPos.Y < expandedViewRect.Y - expandedViewRect.Height) return null;
+
             if (particles[particleCount] == null) particles[particleCount] = new Particle();
 
             particles[particleCount].Init(prefab, position, speed, rotation, hullGuess);
@@ -78,7 +86,6 @@ namespace Barotrauma.Particles
             particleCount++;
 
             return particles[particleCount - 1];
-
         }
 
         public ParticlePrefab FindPrefab(string prefabName)
@@ -131,7 +138,7 @@ namespace Barotrauma.Particles
             }
         }
 
-        public void Draw(SpriteBatch spriteBatch, bool inWater, ParticleBlendState blendState)
+        public void Draw(SpriteBatch spriteBatch, bool inWater, bool? inSub, ParticleBlendState blendState)
         {
             ParticlePrefab.DrawTargetType drawTarget = inWater ? ParticlePrefab.DrawTargetType.Water : ParticlePrefab.DrawTargetType.Air;
 
@@ -139,6 +146,7 @@ namespace Barotrauma.Particles
             {
                 if (particles[i].BlendState != blendState) continue;
                 if (!particles[i].DrawTarget.HasFlag(drawTarget)) continue;
+                if (inSub.HasValue && (particles[i].CurrentHull == null) == inSub.Value) continue;
                 
                 particles[i].Draw(spriteBatch);
             }

Barotrauma/BarotraumaClient/Source/Screens/GameScreen.cs

@@ -134,6 +134,27 @@ namespace Barotrauma
                 Level.Loaded.DrawBack(graphics, spriteBatch, cam, BackgroundCreatureManager);
             }
 
+#if LINUX
+            spriteBatch.Begin(SpriteSortMode.Deferred,
+                BlendState.NonPremultiplied,
+                null, DepthStencilState.DepthRead, null, null,
+                cam.Transform);
+#else
+            spriteBatch.Begin(SpriteSortMode.Deferred,
+            BlendState.AlphaBlend,
+            null, DepthStencilState.DepthRead, null, null,
+            cam.Transform);
+#endif
+            GameMain.ParticleManager.Draw(spriteBatch, true, false, Particles.ParticleBlendState.AlphaBlend);
+            spriteBatch.End();
+
+            spriteBatch.Begin(SpriteSortMode.Deferred,
+                BlendState.Additive,
+                null, DepthStencilState.Default, null, null,
+                cam.Transform);
+            GameMain.ParticleManager.Draw(spriteBatch, true, false, Particles.ParticleBlendState.Additive);
+            spriteBatch.End();
+
             spriteBatch.Begin(SpriteSortMode.BackToFront,
                 BlendState.AlphaBlend,
                 null, null, null, null,
@@ -181,14 +202,14 @@ namespace Barotrauma
             null, DepthStencilState.DepthRead, null, null,
             cam.Transform);
 #endif
-            GameMain.ParticleManager.Draw(spriteBatch, true, Particles.ParticleBlendState.AlphaBlend);
+            GameMain.ParticleManager.Draw(spriteBatch, true, true, Particles.ParticleBlendState.AlphaBlend);
             spriteBatch.End();
 
             spriteBatch.Begin(SpriteSortMode.Deferred,
                 BlendState.Additive,
                 null, DepthStencilState.Default, null, null,
                 cam.Transform);
-            GameMain.ParticleManager.Draw(spriteBatch, true, Particles.ParticleBlendState.Additive);
+            GameMain.ParticleManager.Draw(spriteBatch, true, true, Particles.ParticleBlendState.Additive);
             spriteBatch.End();
 
             //----------------------------------------------------------------------------------------
@@ -211,14 +232,14 @@ namespace Barotrauma
                 cam.Transform);
 #endif
 
-            GameMain.ParticleManager.Draw(spriteBatch, false, Particles.ParticleBlendState.AlphaBlend);
+            GameMain.ParticleManager.Draw(spriteBatch, false, null, Particles.ParticleBlendState.AlphaBlend);
             spriteBatch.End();
 
             spriteBatch.Begin(SpriteSortMode.Deferred,
                 BlendState.Additive,
                 null, DepthStencilState.DepthRead, null, null,
                 cam.Transform);
-            GameMain.ParticleManager.Draw(spriteBatch, false, Particles.ParticleBlendState.Additive);
+            GameMain.ParticleManager.Draw(spriteBatch, false, null, Particles.ParticleBlendState.Additive);
             spriteBatch.End();
 
             if (Character.Controlled != null && GameMain.LightManager.LosEnabled)

Barotrauma/BarotraumaShared/Content/Items/Tools/tools.xml

@@ -270,8 +270,8 @@
       <StatusEffect type="OnUse" target="This" IsOn="true"/>
 
       <StatusEffect type="OnActive" target="This" Condition="-1.0">
-        <ParticleEmitter particle="flare"/>
+        <ParticleEmitter particle="flare" particlespersecond="30"/>
-        <ParticleEmitter particle="bubbles"/>
+        <ParticleEmitter particle="bubbles" particlespersecond="30"/>
       </StatusEffect>
 
       <StatusEffect type="OnBroken" target="This" IsOn="false"/>

Barotrauma/BarotraumaShared/Source/Characters/Attack.cs

@@ -143,7 +143,7 @@ namespace Barotrauma
         
         public AttackResult DoDamage(IDamageable attacker, IDamageable target, Vector2 worldPosition, float deltaTime, bool playSound = true)
         {
-            DamageParticles(worldPosition);
+            DamageParticles(deltaTime, worldPosition);
 
             var attackResult = target.AddDamage(attacker, worldPosition, this, deltaTime, playSound);
 
@@ -168,6 +168,6 @@ namespace Barotrauma
 
             return attackResult;
         }
-        partial void DamageParticles(Vector2 worldPosition);
+        partial void DamageParticles(float deltaTime, Vector2 worldPosition);
     }
 }

Barotrauma/BarotraumaShared/Source/Characters/StatusEffect.cs

@@ -23,7 +23,7 @@ namespace Barotrauma
         private List<RelatedItem> requiredItems;
 
 #if CLIENT
-        private List<ParticleEmitterPrefab> particleEmitters;
+        private List<ParticleEmitter> particleEmitters;
 
         private Sound sound;
 #endif
@@ -77,7 +77,7 @@ namespace Barotrauma
             requiredItems = new List<RelatedItem>();
 
 #if CLIENT
-            particleEmitters = new List<ParticleEmitterPrefab>();
+            particleEmitters = new List<ParticleEmitter>();
 #endif
 
             IEnumerable<XAttribute> attributes = element.Attributes();            
@@ -179,7 +179,7 @@ namespace Barotrauma
                         break;
 #if CLIENT
                     case "particleemitter":
-                        particleEmitters.Add(new ParticleEmitterPrefab(subElement));
+                        particleEmitters.Add(new ParticleEmitter(subElement));
                         break;
 #endif
                 }
@@ -280,9 +280,9 @@ namespace Barotrauma
             }
 
 #if CLIENT
-            foreach (ParticleEmitterPrefab emitter in particleEmitters)
+            foreach (ParticleEmitter emitter in particleEmitters)
             {
-                emitter.Emit(entity.WorldPosition, hull);
+                emitter.Emit(deltaTime, entity.WorldPosition, hull);
             }
 #endif
         }