cell/source/sprite.c

#include "sprite.h"

sprite *make_sprite(void)
{
  sprite *sprite = calloc(sizeof(*sprite),1);
  sprite->image = JS_UNDEFINED;
  return sprite;
}

void sprite_free(JSRuntime *rt, sprite *sprite)
{
  JS_FreeValueRT(rt,sprite->image);
  free(sprite);
}

void sprite_apply(sprite *sp)
{
  float        rot = sp->rotation;
  HMM_Vec2     k   = sp->skew;
  HMM_Vec2     s   = sp->scale;

  float c = cosf(rot),  si = sinf(rot);

  sp->affine.Columns[0] = (HMM_Vec2){
    .x = (c  + k.x * si) * s.x,
    .y = (k.y * c + si) * s.x
  };
  sp->affine.Columns[1] = (HMM_Vec2){
    .x = (-si + k.x * c) * s.y,
    .y = (-k.y * si + c) * s.y
  };
}