step_animation_once.inc.c

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/*
 * Steps OBJ's animation through FRAMES by the frame time (at most 4) and
 * returns its frame, 0xFF once it has ended. depth is 0 for the caller.
 */
s32 stepAnimationOnce(StageTileAnim *obj, AnimFrame *frames, s32 depth) {
    AnimFrame *frame = &frames[obj->anim.index];
    s32 dt = GFX.funcs.getFrameTime();
 
    if (dt > 4) {
        dt = 4;
    }
    if (depth == 0) {
        obj->anim.timer -= dt;
    }
    if (obj->anim.timer <= 0) {
        frame++;
        obj->anim.index++;
        obj->anim.timer += frame->duration;
        if (frame->frame == 0xFF) {
            return 0xFF;
        }
        stepAnimationOnce(obj, frames, depth + 1);
    }
    return frame->frame;
}