Duke Nukem 1 bouncy mine

mine.c

/*
  Lookup table

  The numbers are in 1/8th of a pixel.
  See https://lethalguitar.wordpress.com/2023/11/12/duke-nukem-1s-sprite-rendering/#coordinate-systems
*/
int BOUNCE_MINE_JUMP_ARC[] =
  {128, 96, 64, 32, 8, 4, 1, -1, -4, -8, -32, -64, -96, -128};


/*
  Bouncing logic

  Runs once every frame for each bouncy mine actor

  actor->state is initially -6
*/
actor->y -= BOUNCE_MINE_JUMP_ARC[actor->state + 6];

actor->state++;
if (actor->state == 8)
{
  actor->state = -6;
}

if (actor->state == -6)
{
  PlaySound(SND_MINE_BOUNCE);
}