3dtoys/ecs_comps.h

// A bunch of component definitions that might not
// be useful in general, but who knows?

#ifndef __HALOO3D_ECSCOMP_H
#define __HALOO3D_ECSCOMP_H

#include "ecs.h"
#include "haloo3d/haloo3d.h"

// A component that simply points back to an object instance. If combined
// with movement, will pull pos from objin at start of frame, then write
// pos back to obj at end of frame.
typedef haloo3d_obj_instance *ecs_objin;

// Like objin, this component simply points to a camera. It will set the
// position AND rotation at the start of the frame, and pull the pos/
// rotation back into the camera at the end.
typedef haloo3d_camera *ecs_camera;

typedef struct {
  struct vec3 pos;
  struct vec3 dst;
  int timer;
} ecs_moveto;

typedef struct {
  struct vec2 rot;
  struct vec2 dstrot;
  int timer;
} ecs_rotateto;

// Move object position into moveto
// static void sys_ecs_objin_moveto(haloo_ecs *ecs, hecs_eidt id, hecs_cidt
// oiid,
//                                  hecs_cidt mtid) {
//   eprintf("Objin moveto %ld, %ld\n", oiid, mtid);
//   ecs_moveto *mt = HECS_ENTITYCOMPONENT(ecs_moveto *, id, mtid, ecs);
//   ecs_objin *oi = HECS_ENTITYCOMPONENT(ecs_objin *, id, oiid, ecs);
//   eprintf("Objin moveto END\n");
//   mt->pos = (*oi)->pos;
// }

// Move camera position into moveto
static void sys_ecs_camera_moveto(haloo_ecs *ecs, hecs_eidt id, hecs_cidt camid,
                                  hecs_cidt mtid) {
  // eprintf("Camera moveto %ld, %ld\n", camid, mtid);
  ecs_moveto *mt = HECS_ENTITYCOMPONENT(ecs_moveto *, id, mtid, ecs);
  ecs_camera *cam = HECS_ENTITYCOMPONENT(ecs_camera *, id, camid, ecs);
  // eprintf("Camera moveto END\n");
  mt->pos = (*cam)->pos;
}

static void sys_ecs_camera_rotateto(haloo_ecs *ecs, hecs_eidt id,
                                    hecs_cidt camid, hecs_cidt rtid) {
  ecs_rotateto *rt = HECS_ENTITYCOMPONENT(ecs_rotateto *, id, rtid, ecs);
  ecs_camera *cam = HECS_ENTITYCOMPONENT(ecs_camera *, id, camid, ecs);
  rt->rot.x = (*cam)->yaw;
  rt->rot.y = (*cam)->pitch;
}

static void sys_ecs_moveto(haloo_ecs *ecs, hecs_eidt id, hecs_cidt mtid) {
  ecs_moveto *mt = HECS_ENTITYCOMPONENT(ecs_moveto *, id, mtid, ecs);
  if (mt->timer <= 0) {
    mt->pos = mt->dst;
    return;
  }
  mfloat_t xdiff = mt->dst.x - mt->pos.x;
  mfloat_t ydiff = mt->dst.y - mt->pos.y;
  mfloat_t zdiff = mt->dst.z - mt->pos.z;
  mt->pos.x += xdiff / mt->timer;
  mt->pos.y += ydiff / mt->timer;
  mt->pos.z += zdiff / mt->timer;
  mt->timer--;
}

static void sys_ecs_rotateto(haloo_ecs *ecs, hecs_eidt id, hecs_cidt rtid) {
  ecs_rotateto *rt = HECS_ENTITYCOMPONENT(ecs_rotateto *, id, rtid, ecs);
  if (rt->timer <= 0) {
    rt->rot = rt->dstrot;
    return;
  }
  mfloat_t xdiff = rt->dstrot.x - rt->rot.x;
  mfloat_t ydiff = rt->dstrot.y - rt->rot.y;
  rt->rot.x += xdiff / rt->timer;
  rt->rot.y += ydiff / rt->timer;
  rt->timer--;
}

// // Move movement pos back into object
// static void sys_ecs_moveto_objin(haloo_ecs *ecs, hecs_eidt id, hecs_cidt
// mtid,
//                                  hecs_cidt oiid) {
//   ecs_moveto *mt = HECS_ENTITYCOMPONENT(ecs_moveto *, id, mtid, ecs);
//   ecs_objin *oi = HECS_ENTITYCOMPONENT(ecs_objin *, id, oiid, ecs);
//   (*oi)->pos = mt->pos;
// }

// Move movement pos back into camera
static void sys_ecs_moveto_camera(haloo_ecs *ecs, hecs_eidt id, hecs_cidt mtid,
                                  hecs_cidt camid) {
  ecs_moveto *mt = HECS_ENTITYCOMPONENT(ecs_moveto *, id, mtid, ecs);
  ecs_camera *cam = HECS_ENTITYCOMPONENT(ecs_camera *, id, camid, ecs);
  (*cam)->pos = mt->pos;
}

// Move rotation back into camera
static void sys_ecs_rotateto_camera(haloo_ecs *ecs, hecs_eidt id,
                                    hecs_cidt rtid, hecs_cidt camid) {
  ecs_rotateto *rt = HECS_ENTITYCOMPONENT(ecs_rotateto *, id, rtid, ecs);
  ecs_camera *cam = HECS_ENTITYCOMPONENT(ecs_camera *, id, camid, ecs);
  (*cam)->yaw = rt->rot.x;
  (*cam)->pitch = rt->rot.y;
}

#endif