luboslenco
120 lines
2.4 KiB
C
120 lines
2.4 KiB
C
#include "iron_tween.h"
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#include "iron_array.h"
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#include "iron_gc.h"
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#include <math.h>
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#include <stdbool.h>
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static any_array_t *_tween_anims = NULL;
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static bool _tween_registered = false;
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f32 sys_delta(void);
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void sys_notify_on_update(void (*f)(void *data), void *data);
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static void _tween_register(void) {
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_tween_registered = true;
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_tween_anims = any_array_create(0);
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gc_root(_tween_anims);
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sys_notify_on_update(tween_update, NULL);
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}
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tween_anim_t *tween_to(tween_anim_t *anim) {
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if (!_tween_registered) {
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_tween_register();
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}
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if (anim->target != NULL) {
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anim->_from = *anim->target;
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}
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any_array_push(_tween_anims, anim);
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return anim;
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}
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tween_anim_t *tween_timer(f32 delay, void (*done)(void *data), void *data) {
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tween_anim_t *a = gc_alloc(sizeof(tween_anim_t));
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a->target = NULL;
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a->to = 0.0f;
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a->duration = 0.0f;
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a->delay = delay;
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a->ease = EASE_LINEAR;
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a->done = done;
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a->tick = NULL;
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a->done_data = data;
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a->_from = 0.0f;
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a->_time = 0.0f;
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return tween_to(a);
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}
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void tween_stop(tween_anim_t *anim) {
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array_remove(_tween_anims, anim);
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}
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void tween_reset(void) {
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gc_unroot(_tween_anims);
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_tween_anims = any_array_create(0);
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gc_root(_tween_anims);
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}
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static f32 _tween_ease_linear(f32 k) {
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return k;
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}
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static f32 _tween_ease_expo_in(f32 k) {
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return k == 0.0f ? 0.0f : powf(2.0f, 10.0f * (k - 1.0f));
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}
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static f32 _tween_ease_expo_out(f32 k) {
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return k == 1.0f ? 1.0f : (1.0f - powf(2.0f, -10.0f * k));
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}
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static f32 _tween_ease(ease_t ease, f32 k) {
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if (ease == EASE_LINEAR) {
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return _tween_ease_linear(k);
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}
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if (ease == EASE_EXPO_IN) {
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return _tween_ease_expo_in(k);
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}
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if (ease == EASE_EXPO_OUT) {
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return _tween_ease_expo_out(k);
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}
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return 0.0f;
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}
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void tween_update(void *unused) {
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if (_tween_anims == NULL) {
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return;
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}
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f32 d = sys_delta();
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i32 i = (i32)_tween_anims->length;
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while (i-- > 0 && _tween_anims->length > 0) {
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tween_anim_t *a = _tween_anims->buffer[i];
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if (a->delay > 0.0f) {
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a->delay -= d;
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continue;
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}
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a->_time += d;
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if (a->_time >= a->duration) {
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array_splice(_tween_anims, (uint32_t)i, 1);
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i--;
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if (a->done != NULL) {
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a->done(a->done_data);
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}
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continue;
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}
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f32 k = a->_time / a->duration;
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if (k > 1.0f) {
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k = 1.0f;
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}
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if (a->target != NULL) {
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*a->target = a->_from + (a->to - a->_from) * _tween_ease(a->ease, k);
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}
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if (a->tick != NULL) {
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a->tick();
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}
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}
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}
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