step_tile_animation3.inc.c

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/*
 * stepTileAnimation under a third name: steps OBJ's animation through FRAMES
 * by the frame time (at most 4) and returns its frame: at the end (frame
 * 0xFF) it loops, or returns 0xFF if once. depth is 0 for the caller.
 */
s32 stepTileAnimation3(StageTileAnim *obj, AnimFrame *frames, s32 once, 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 (once) {
            if (frame->frame == 0xFF) {
                return 0xFF;
            }
        } else if (frame->frame == 0xFF) {
            frame = frames;
            obj->anim.index = 0;
            obj->anim.timer += frame->duration;
        }
        stepTileAnimation3(obj, frames, once, depth + 1);
    }
    return frame->frame;
}