gelParticle.h

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/*
Gel2D Game Engine - Cross-platform 2D gaming middleware
Copyright (C) 2011 Mark D. Procarione

Gel2D is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

Gel2D is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
*/

#ifndef __GELPARTICLE_H__
#define __GELPARTICLE_H__

#include "gelObject.h"
#include "gelColor.h"
#include "gelTimer.h"
#include "gelMath.h"

#define GEL2D_PARSYS_HEADER "GEL2D_PARSYS_v0.1"
#define GEL_MAX_PARTICLES 1000

namespace gel
{
    struct GelParticle
    {

                GelParticle();

        Gel2dVec pos;
        Gel2dVec size;
        Gel2dVec sizeDelta;
        float    rot;
        float    rotDelta;
        Gel2dVec vel;
        GelColor col;
        GelColor colDelta;

        float gravity;

        float radialAccel;

        float tangetAccel;

        float life;
        float age;
    };


    struct GelParSysData
    {
        int emissionRate;

        int infiniteSysLife;
        float sysLife;

        Gel2dVec originDis;

        float direction;
        float spread;

        float minLife;
        float maxLife;

        float minSpeed;
        float maxSpeed;

        float minGravity;
        float maxGravity;

        float minRadialAccel;
        float maxRadialAccel;

        float minTangetAccel;
        float maxTangetAccel;

        float startSize;
        float endSize;
        float randSize;

        float parRot;
        float randRot;

        float startAlpha;
        float endAlpha;
        float randAlpha;

        GelColor minStartCol;
        GelColor maxStartCol;
        GelColor minEndCol;
        GelColor maxEndCol;
        GelColor randCol;

        Gel2dVec uv[4];
    };

    class GelParticleSys : public GelObject, public GelTextureObject
    {
        public:
            GelParticleSys();


            GelParticleSys( const char *desc_name );

            ~GelParticleSys();


            Gel2dVec getLoc() const { return location; }


            void setLoc( Gel2dVec loc ) { location = loc; }


            void fire() { sysAge = 0.0; }


                void setTexture( GelTexture *tex );

            void mapRect( const Gel2dVec &pos, const Gel2dVec &size);


            int writeDesc( const char *filename );


            int readDesc( const char *filename );


            void update();

            void render();

        private:
                        GelParticle particles[GEL_MAX_PARTICLES];

                        int aliveCount;

            Gel2dVec location;   // emitter location

            GelTimer timer;
            double ticks;

                        float sysAge;

        public:
            int emissionRate;

                        bool infiniteSysLife;
                        float sysLife;

                        Gel2dVec originDis;

                        float direction;
                float spread;

                        float minLife;
                        float maxLife;

                        float minSpeed;
                        float maxSpeed;

                        float minGravity;
                        float maxGravity;

                        float minRadialAccel;
                        float maxRadialAccel;

                        float minTangetAccel;
                        float maxTangetAccel;

                        float startSize;
                        float endSize;
                        float randSize;

                        float parRot;
                        float randRot;

                        float startAlpha;
                        float endAlpha;
                        float randAlpha;

                        GelColor minStartCol;
                        GelColor maxStartCol;
                        GelColor minEndCol;
                        GelColor maxEndCol;
                        GelColor randCol;

                        Gel2dVec uv[4];
    };
}

#endif // __GELPARTICLE_H__