From 39ed87570bdb2f86969d4be821c94b722dc71179 Mon Sep 17 00:00:00 2001
From: Joe Ludwig <joe@valvesoftware.com>
Date: Wed, 26 Jun 2013 15:22:04 -0700
Subject: First version of the SOurce SDK 2013

---
 mp/src/game/client/particle_simple3d.cpp | 134 +++++++++++++++++++++++++++++++
 1 file changed, 134 insertions(+)
 create mode 100644 mp/src/game/client/particle_simple3d.cpp

(limited to 'mp/src/game/client/particle_simple3d.cpp')

diff --git a/mp/src/game/client/particle_simple3d.cpp b/mp/src/game/client/particle_simple3d.cpp
new file mode 100644
index 00000000..c547db56
--- /dev/null
+++ b/mp/src/game/client/particle_simple3d.cpp
@@ -0,0 +1,134 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $Workfile:     $
+// $NoKeywords: $
+//=============================================================================//
+#include "cbase.h"
+#include "particle_simple3d.h"
+#include "view.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include "tier0/memdbgon.h"
+
+// Defined in pm_math.c
+float anglemod( float a );
+
+//------------------------------------------------------------------------------
+// Purpose :
+// Input   :
+// Output  :
+//------------------------------------------------------------------------------
+CSmartPtr<CSimple3DEmitter> CSimple3DEmitter::Create( const char *pDebugName )	
+{
+	CSimple3DEmitter* pSimple3DEmitter = new CSimple3DEmitter( pDebugName );
+
+	// Do in world space
+	pSimple3DEmitter->m_ParticleEffect.SetEffectCameraSpace( false );
+	return pSimple3DEmitter;
+}
+
+
+void CSimple3DEmitter::SimulateParticles( CParticleSimulateIterator *pIterator )
+{
+	Particle3D *pParticle = (Particle3D*)pIterator->GetFirst();
+	while ( pParticle )
+	{
+		const float	timeDelta = pIterator->GetTimeDelta();
+
+		//Should this particle die?
+		pParticle->m_flLifeRemaining -= timeDelta;
+
+		if ( pParticle->IsDead() )
+		{
+			pIterator->RemoveParticle( pParticle );
+		}
+		else
+		{
+			// Angular rotation
+			pParticle->m_vAngles.x += pParticle->m_flAngSpeed * timeDelta;
+			pParticle->m_vAngles.y += pParticle->m_flAngSpeed * timeDelta;
+			pParticle->m_vAngles.z += pParticle->m_flAngSpeed * timeDelta;
+
+			//Simulate the movement with collision
+			trace_t trace;
+			m_ParticleCollision.MoveParticle( pParticle->m_Pos, pParticle->m_vecVelocity, &pParticle->m_flAngSpeed, timeDelta, &trace );
+
+			// ---------------------------------------
+			// Decay towards flat
+			// ---------------------------------------
+			if (pParticle->m_flAngSpeed == 0 || trace.fraction != 1.0)
+			{
+				pParticle->m_vAngles.x = anglemod(pParticle->m_vAngles.x);
+				if (pParticle->m_vAngles.x < 180)
+				{
+					if (fabs(pParticle->m_vAngles.x - 90) > 0.5)
+					{
+						pParticle->m_vAngles.x = 0.5*pParticle->m_vAngles.x + 46;
+					}
+				}
+				else
+				{
+					if (fabs(pParticle->m_vAngles.x - 270) > 0.5)
+					{
+						pParticle->m_vAngles.x = 0.5*pParticle->m_vAngles.x + 135;
+					}
+				}
+
+				pParticle->m_vAngles.y = anglemod(pParticle->m_vAngles.y);
+				if (fabs(pParticle->m_vAngles.y) > 0.5)
+				{
+					pParticle->m_vAngles.y = 0.5*pParticle->m_vAngles.z;
+				}
+			}
+		}
+
+		pParticle = (Particle3D*)pIterator->GetNext();
+	}
+}
+
+
+void CSimple3DEmitter::RenderParticles( CParticleRenderIterator *pIterator )
+{
+	const Particle3D *pParticle = (const Particle3D *)pIterator->GetFirst();
+	while ( pParticle )
+	{
+		float sortKey = CurrentViewForward().Dot( CurrentViewOrigin() - pParticle->m_Pos );
+
+		// -------------------------------------------------------
+		//  Set color based on direction towards camera
+		// -------------------------------------------------------
+		Vector	color;
+		Vector vFaceNorm;
+		Vector vCameraToFace = (pParticle->m_Pos - CurrentViewOrigin());
+		AngleVectors(pParticle->m_vAngles,&vFaceNorm);
+		float flFacing = DotProduct(vCameraToFace,vFaceNorm);
+
+		if (flFacing <= 0)
+		{
+			color[0] = pParticle->m_uchFrontColor[0] / 255.0f;
+			color[1] = pParticle->m_uchFrontColor[1] / 255.0f;
+			color[2] = pParticle->m_uchFrontColor[2] / 255.0f;
+		}
+		else
+		{
+			color[0] = pParticle->m_uchBackColor[0] / 255.0f;
+			color[1] = pParticle->m_uchBackColor[1] / 255.0f;
+			color[2] = pParticle->m_uchBackColor[2] / 255.0f;
+		}
+
+		//Render it in world space
+		RenderParticle_ColorSizeAngles(
+			pIterator->GetParticleDraw(),
+			pParticle->m_Pos,
+			color,
+			pParticle->GetFadeFraction(),
+			pParticle->m_uchSize,
+			pParticle->m_vAngles);
+
+		pParticle = (const Particle3D *)pIterator->GetNext( sortKey );
+	}
+}
+
+
-- 
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