Merge pull request #576 from Jaredl-Dev/fix/one-frame-attached-particle-visibility-60hz

- Fix one-frame attached particle visibility at 60Hz

Author: x64-dev

Core/GameEngine/Source/GameClient/System/ParticleSys.cpp

@@ -1427,13 +1427,22 @@ void ParticleSystem::rotateLocalTransformZ( Real z )
 // ------------------------------------------------------------------------------------------------
 /** Attach this particle system to a Drawable */
 // ------------------------------------------------------------------------------------------------
-void ParticleSystem::attachToDrawable( const Drawable *draw )
-{
-	if (draw)
-		m_attachedToDrawableID = draw->getID();
-	else
-		m_attachedToDrawableID = INVALID_DRAWABLE_ID;
-}
+void ParticleSystem::attachToDrawable( const Drawable *draw )
+{
+	if (draw)
+	{
+		m_attachedToDrawableID = draw->getID();
+
+#if defined(GENERALS_ONLINE_HIGH_FPS_RENDER)
+		// Info: One-frame attached systems can otherwise lose their only burst when the drawable is created and destroyed
+		// between legacy particle updates at 60Hz.
+		if (m_systemLifetimeLeft == 1 && m_delayLeft == 0 && getParticleCount() == 0)
+			update(0);
+#endif
+	}
+	else
+		m_attachedToDrawableID = INVALID_DRAWABLE_ID;
+}
 
 // ------------------------------------------------------------------------------------------------
 /** Attach this particle system to a Drawable */