#ifndef PARTICLE_H #define PARTICLE_H #include "HandmadeMath.h" #include "warp.h" #include "transform.h" #include "texture.h" #include "anim.h" #include "gameobject.h" #include "render.h" typedef struct particle { HMM_Vec4 pos; HMM_Vec4 v; /* velocity */ float angle; float av; /* angular velocity */ float scale; double time; double life; HMM_Vec4 color; } particle; #define SPRAY 0 #define CLOUD 1 #define MESH 2 typedef struct par_vert { HMM_Vec2 pos; float angle; float scale; HMM_Vec4 color; } par_vert; typedef struct emitter { struct particle *particles; par_vert *verts; HMM_Vec3 *mesh; /* list of points to optionally spawn from */ HMM_Vec3 *norm; /* norm at each point */ int type; /* spray, cloud, or mesh */ 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 */ double life_var; /* SPRAY PARTICLE GEN */ float speed; /* initial speed of particle */ float variation; /* variation on speed */ float divergence; /* angular degree of variation from emitter normal, up to 1 */ float tumble; /* amount of random rotation of particles */ float tumble_rate; /* tumble rotation */ HMM_Vec4 color; /* color over particle lifetime */ float scale; float scale_var; float grow_for; /* seconds to grow from small until scale */ float shrink_for; /* seconds to shrink to small prior to its death */ /* 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; double tte; /* time to emit */ } emitter; emitter *make_emitter(); void emitter_free(emitter *e); void emitter_emit(emitter *e, int count, transform *t); void emitter_step(emitter *e, double dt, transform *t); void emitter_draw(emitter *e, sg_buffer *b); #endif