62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
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tween_t tween() {
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tween_t tw = {0};
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return tw;
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}
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float tween_update(tween_t *tw, float dt) {
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if (!array_count(tw->keyframes)) return 0.0f;
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for (size_t i = 0; i < array_count(tw->keyframes) - 1; ++i) {
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tween_keyframe_t *kf1 = &tw->keyframes[i];
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tween_keyframe_t *kf2 = &tw->keyframes[i + 1];
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if (tw->time >= kf1->t && tw->time <= kf2->t) {
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float localT = (tw->time - kf1->t) / (kf2->t - kf1->t);
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float easedT = ease(localT, kf1->easing_mode);
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tw->result = mix3(kf1->v, kf2->v, easedT);
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break;
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}
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}
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float done = (tw->time / tw->duration);
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tw->time += dt;
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return clampf(done, 0.0f, 1.0f);
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}
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void tween_reset(tween_t *tw) {
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tw->time = 0.0f;
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}
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void tween_destroy(tween_t *tw) {
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tween_t tw_ = {0};
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array_free(tw->keyframes);
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*tw = tw_;
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}
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static inline
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int tween_comp_keyframes(const void *a, const void *b) {
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float t1 = ((const tween_keyframe_t*)a)->t;
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float t2 = ((const tween_keyframe_t*)b)->t;
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return (t1 > t2) - (t1 < t2);
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}
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void tween_keyframe_set(tween_t *tw, float t, int mode, vec3 v) {
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tween_keyframe_t keyframe = { mode, t, v };
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array_push(tw->keyframes, keyframe);
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array_sort(tw->keyframes, tween_comp_keyframes);
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tw->duration = array_back(tw->keyframes)->t;
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}
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void tween_keyframe_unset(tween_t *tw, float t) { /*@todo: untested*/
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int id = -1;
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for (int i = 0; i < array_count(tw->keyframes); i++) {
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if (tw->keyframes[i].t == t) {
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id = i;
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break;
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}
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}
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if (id == -1) return;
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array_erase_slow(tw->keyframes, id);
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tw->duration = array_back(tw->keyframes)->t;
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}
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