particle.h

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#ifndef _ANTI_PARTICLE_
#define _ANTI_PARTICLE_

#include "antistd.h"
#include "antiglobals.h"
#include "texture.h"

typedef struct aeParticle
{
        vec2 size;
        vec3 pos;
        vec3 vel;
        vec3 acc;
        int ttl;
        
        aeTexture* tex;
        vec4 color;

        struct aeParticle* prev;
        struct aeParticle* next;
} aeParticle;

typedef struct aeParticleEmitter
{
        vec2 size;
        vec3 pos;
        vec3 vel;
        float arc; // max angle deflection from vel
        vec3 acc;
        int ttl; 
        float rate; // how many per second to emit (on average)

        vec4 color;
        aeTexture* tex;

        int (*spawn_func)(void); // how many to emit
        void (*init_func)(aeParticle*,struct aeParticleEmitter*); // initialize particle
        void (*size_func)(vec2*); // particle size
        void (*pos_func)(vec3*); // decide initial position
        void (*vel_func)(vec3*); // decide initial velocity
        void (*acc_func)(vec3*); // decide initial acceleration
        int (*ttl_func)(void);   // decide time to live
        void (*color_func)(vec4*);
        aeTexture* (*tex_func)(void);

        void (*frame_func)(aeParticle*);
        int frame_override;

        aeParticle* root;
        aeParticle* end;
} aeParticleEmitter;

aeParticleEmitter* aeCreateParticleEmitter(void);
void aeDestroyParticleEmitter(aeParticleEmitter*);
void aeRenderParticles(aeParticleEmitter*);
void __aeDestroyParticle(aeParticleEmitter*, aeParticle*);

#endif

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