77 lines
2 KiB
C
77 lines
2 KiB
C
#ifndef PARTICLE_H
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#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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typedef struct particle {
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HMM_Vec4 pos;
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HMM_Vec4 v; /* velocity */
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float angle;
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float av; /* angular velocity */
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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
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#define CLOUD 1
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#define MESH 2
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typedef struct emitter {
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struct particle *particles;
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transform3d t;
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gameobject *go;
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HMM_Vec3 *mesh; /* list of points to optionally spawn from */
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HMM_Vec3 *norm; /* norm at each point */
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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. */
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int max; /* number of particles */
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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 */
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float variation; /* variation on speed */
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float divergence; /* angular degree of variation from emitter normal, up to 1 */
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float tumble; /* amount of random rotation of particles */
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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;
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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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/* PARTICLE TYPE */
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texture *texture;
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/* ROTATION AND COLLISION */
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int collision_mask; /* mask for collision */
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float bounce; /* bounce back after collision */
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/* PARTICLE SPAWN */
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int die_after_collision;
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float persist; /* how long to linger after death */
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float persist_var;
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/* TRAILS */
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warpmask warp_mask;
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int on;
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double tte; /* time to emit */
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} emitter;
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void particle_init();
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emitter *make_emitter();
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void emitter_free(emitter *e);
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void start_emitter(emitter *e);
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void stop_emitter(emitter *e);
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void emitter_emit(emitter *e, int count);
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void emitters_step(double dt);
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void emitters_draw(HMM_Mat4 *proj);
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void emitter_step(emitter *e, double dt);
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#endif
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