Initial Prey Game integration support.

neo/prey/game/SmokeParticles.h

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+// Copyright (C) 2004 Id Software, Inc.
+//
+
+#ifndef __SMOKEPARTICLES_H__
+#define __SMOKEPARTICLES_H__
+
+/*
+===============================================================================
+
+	Smoke systems are for particles that are emitted off of things that are
+	constantly changing position and orientation, like muzzle smoke coming
+	from a bone on a weapon, blood spurting from a wound, or particles
+	trailing from a monster limb.
+
+	The smoke particles are always evaluated and rendered each tic, so there
+	is a performance cost with using them for continuous effects. The general
+	particle systems are completely parametric, and have no performance
+	overhead when not in view.
+
+	All smoke systems share the same shaderparms, so any coloration must be
+	done in the particle definition.
+
+	Each particle model has its own shaderparms, which can be used by the
+	particle materials.
+
+===============================================================================
+*/
+
+typedef struct singleSmoke_s {
+	struct singleSmoke_s	 *	next;
+	int							privateStartTime;	// start time for this particular particle
+	int							index;				// particle index in system, 0 <= index < stage->totalParticles
+	idRandom					random;
+	idVec3						origin;
+	idMat3						axis;
+} singleSmoke_t;
+
+typedef struct {
+	const idParticleStage *		stage;
+	singleSmoke_t *				smokes;
+} activeSmokeStage_t;
+
+
+class idSmokeParticles {
+public:
+								idSmokeParticles( void );
+
+	// creats an entity covering the entire world that will call back each rendering
+	void						Init( void );
+	void						Shutdown( void );
+
+	// spits out a particle, returning false if the system will not emit any more particles in the future
+	bool						EmitSmoke( const idDeclParticle *smoke, const int startTime, const float diversity,
+											const idVec3 &origin, const idMat3 &axis );
+
+	// free old smokes
+	void						FreeSmokes( void );
+
+private:
+	bool						initialized;
+
+	renderEntity_t				renderEntity;			// used to present a model to the renderer
+	int							renderEntityHandle;		// handle to static renderer model
+
+	static const int			MAX_SMOKE_PARTICLES = 10000;
+	singleSmoke_t				smokes[MAX_SMOKE_PARTICLES];
+
+	idList<activeSmokeStage_t>	activeStages;
+	singleSmoke_t *				freeSmokes;
+	int							numActiveSmokes;
+	int							currentParticleTime;	// don't need to recalculate if == view time
+
+	bool						UpdateRenderEntity( renderEntity_s *renderEntity, const renderView_t *renderView );
+	static bool					ModelCallback( renderEntity_s *renderEntity, const renderView_t *renderView );
+};
+
+#endif /* !__SMOKEPARTICLES_H__ */