CWE-ou-minkata/Sources/Plasma/PubUtilLib/plParticleSystem/plParticleGenerator.h

/*==LICENSE==*

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*==LICENSE==*/
#ifndef plParticleGenerator_inc
#define plParticleGenerator_inc

#include "hsGeometry3.h"
#include "pnNetCommon/plSynchedValue.h"
class plParticleEmitter;
class plScalarController;

// This class is responsible for all the details of automatically generating particles for a plParticleEmitter.
// It gets a change in time, and must do whatever necessary to generate the appropriate number of particles
// for that timespan

class plParticleGenerator : public plCreatable
{

public:
    // returns false if it's done generating particles and is safe to delete.
    virtual bool AddAutoParticles(plParticleEmitter *emitter, float dt, uint32_t numForced = 0) = 0;

    virtual void UpdateParam(uint32_t paramID, float paramValue) = 0;

    CLASSNAME_REGISTER( plParticleGenerator );
    GETINTERFACE_ANY( plParticleGenerator, plCreatable );

    static void ComputeDirection(float pitch, float yaw, hsVector3 &direction);
    static void ComputePitchYaw(float &pitch, float &yaw, const hsVector3 &dir);
    static inline float GetRandomVar() { return 2.0f * rand() / RAND_MAX - 1; } // returns a num between +/- 1.0
};

class plSimpleParticleGenerator : public plParticleGenerator
{
public:
    plSimpleParticleGenerator();
    ~plSimpleParticleGenerator();
    void Init(float genLife, float partLifeMin, float partLifeMax, float particlesPerSecond, 
              uint32_t numSources, hsPoint3 *pos, float *initPitch, float *initYaw, float angleRange,
              float initVelMin, float initVelMax, float xSize, float ySize, 
              float scaleMin, float scaleMax,
              float massRange, float radsPerSecRange);

    CLASSNAME_REGISTER( plSimpleParticleGenerator );
    GETINTERFACE_ANY( plSimpleParticleGenerator, plParticleGenerator);
    
    virtual bool AddAutoParticles(plParticleEmitter *emitter, float dt, uint32_t numForced);
    virtual void UpdateParam(uint32_t paramID, float paramValue);

    virtual void Read(hsStream* s, hsResMgr *mgr); 
    virtual void Write(hsStream* s, hsResMgr *mgr);

protected:
    float fParticlesPerSecond;
    uint32_t fNumSources;
    hsPoint3 *fInitPos;
    float *fInitPitch, *fInitYaw;
    float fAngleRange;
    float fVelMin, fVelMax;
    float fXSize, fYSize, fScaleMin, fScaleMax;
    float fGenLife;  // How long shall we spit out particles from this location? When this time runs out, we stop
                        // spitting particles, but we don't actually die until all of our particles die naturally.
                        // (Even the ones that we feel are suffering needlessly.)

    float fPartLifeMin; // lifespan for the particles we generate
    float fPartLifeMax;

    float fPartInvMassMin;   // Doing a uniform variant over the inverse mass range (instead of over the mass range
    float fPartInvMassRange; // and then inverting) will favor the low end of the mass range, but then again,
                                // it's just a freaking game. Note though that fPartInvMassMin == 1.f / massMAX.

    float fPartRadsPerSecRange; // Zero means no rot, otherwise uniform random between [-range..range]

    float fParticleSum;

    enum
    {
        kImmortal   = 0x1,
        kDisabled   = 0x2,
    };
    uint32_t fMiscFlags;
};

class plOneTimeParticleGenerator : public plParticleGenerator
{
public:

    plOneTimeParticleGenerator();
    ~plOneTimeParticleGenerator();
    void Init(float count, hsPoint3 *pointArray, hsVector3 *dirArray, 
              float xSize, float ySize, float scaleMin, float scaleMax, float radsPerSec);

    CLASSNAME_REGISTER( plOneTimeParticleGenerator );
    GETINTERFACE_ANY( plOneTimeParticleGenerator, plParticleGenerator);

    virtual bool AddAutoParticles(plParticleEmitter *emitter, float dt, uint32_t numForced = 0);
    virtual void UpdateParam(uint32_t paramID, float paramValue) {}

    virtual void Read(hsStream* s, hsResMgr *mgr); 
    virtual void Write(hsStream* s, hsResMgr *mgr);

protected:
    float fCount;
    hsPoint3 *fPosition;
    hsVector3 *fDirection;
    float fXSize, fYSize, fScaleMin, fScaleMax;
    float fPartRadsPerSecRange; // Zero means no rot, otherwise uniform random between [-range..range]
};

#endif