prosperon/source/engine/particle.h

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#ifndef PARTICLE_H
#define PARTICLE_H
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#include "HandmadeMath.h"
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#include "warp.h"
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#include "transform.h"
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#include "texture.h"
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#include "anim.h"
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#include "gameobject.h"
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#include "render.h"
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typedef struct particle {
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HMM_Vec4 pos;
HMM_Vec4 v; /* velocity */
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float angle;
float av; /* angular velocity */
float scale;
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double time;
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double life;
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HMM_Vec4 color;
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} particle;
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#define SPRAY 0
#define CLOUD 1
#define MESH 2
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typedef struct par_vert {
HMM_Vec2 pos;
float angle;
float scale;
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HMM_Vec4 color;
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} par_vert;
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typedef struct emitter {
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struct particle *particles;
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par_vert *verts;
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HMM_Vec3 *mesh; /* list of points to optionally spawn from */
HMM_Vec3 *norm; /* norm at each point */
int type; /* spray, cloud, or mesh */
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float explosiveness; /* 0 for a stream, 1 for all at once. Range of values allowed. */
int max; /* number of particles */
double life; /* how long a particle lasts */
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double life_var;
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/* SPRAY PARTICLE GEN */
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float speed; /* initial speed of particle */
float variation; /* variation on speed */
float divergence; /* angular degree of variation from emitter normal, up to 1 */
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float tumble; /* amount of random rotation of particles */
float tumble_rate; /* tumble rotation */
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sampler color; /* color over particle lifetime */
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float scale;
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float scale_var;
float grow_for; /* seconds to grow from small until scale */
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float shrink_for; /* seconds to shrink to small prior to its death */
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/* ROTATION AND COLLISION */
int collision_mask; /* mask for collision */
float bounce; /* bounce back after collision */
/* PARTICLE SPAWN */
int die_after_collision;
float persist; /* how long to linger after death */
float persist_var;
/* TRAILS */
warpmask warp_mask;
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double tte; /* time to emit */
sg_buffer buffer;
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} emitter;
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emitter *make_emitter();
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void emitter_free(emitter *e);
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void emitter_emit(emitter *e, int count, transform2d *t);
void emitter_step(emitter *e, double dt, transform2d *t);
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void emitter_draw(emitter *e);
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#endif