nuclear@67: #include <stdlib.h>
nuclear@67: #include <string.h>
nuclear@67: #include <assert.h>
nuclear@67: #include "track.h"
nuclear@67: #include "dynarr.h"
nuclear@67: 
nuclear@67: static int keycmp(const void *a, const void *b);
nuclear@67: static int find_prev_key(struct anm_keyframe *arr, int start, int end, anm_time_t tm);
nuclear@67: 
nuclear@67: static float interp_step(float v0, float v1, float v2, float v3, float t);
nuclear@67: static float interp_linear(float v0, float v1, float v2, float v3, float t);
nuclear@67: static float interp_cubic(float v0, float v1, float v2, float v3, float t);
nuclear@67: 
nuclear@67: static anm_time_t remap_extend(anm_time_t tm, anm_time_t start, anm_time_t end);
nuclear@67: static anm_time_t remap_clamp(anm_time_t tm, anm_time_t start, anm_time_t end);
nuclear@67: static anm_time_t remap_repeat(anm_time_t tm, anm_time_t start, anm_time_t end);
nuclear@67: 
nuclear@67: /* XXX keep this in sync with enum anm_interpolator at track.h */
nuclear@67: static float (*interp[])(float, float, float, float, float) = {
nuclear@67: 	interp_step,
nuclear@67: 	interp_linear,
nuclear@67: 	interp_cubic,
nuclear@67: 	0
nuclear@67: };
nuclear@67: 
nuclear@67: /* XXX keep this in sync with enum anm_extrapolator at track.h */
nuclear@67: static anm_time_t (*remap_time[])(anm_time_t, anm_time_t, anm_time_t) = {
nuclear@67: 	remap_extend,
nuclear@67: 	remap_clamp,
nuclear@67: 	remap_repeat,
nuclear@67: 	0
nuclear@67: };
nuclear@67: 
nuclear@67: int anm_init_track(struct anm_track *track)
nuclear@67: {
nuclear@67: 	memset(track, 0, sizeof *track);
nuclear@67: 
nuclear@67: 	if(!(track->keys = dynarr_alloc(0, sizeof *track->keys))) {
nuclear@67: 		return -1;
nuclear@67: 	}
nuclear@67: 	track->interp = ANM_INTERP_LINEAR;
nuclear@67: 	track->extrap = ANM_EXTRAP_CLAMP;
nuclear@67: 	return 0;
nuclear@67: }
nuclear@67: 
nuclear@67: void anm_destroy_track(struct anm_track *track)
nuclear@67: {
nuclear@67: 	dynarr_free(track->keys);
nuclear@67: }
nuclear@67: 
nuclear@67: struct anm_track *anm_create_track(void)
nuclear@67: {
nuclear@67: 	struct anm_track *track;
nuclear@67: 
nuclear@67: 	if((track = malloc(sizeof *track))) {
nuclear@67: 		if(anm_init_track(track) == -1) {
nuclear@67: 			free(track);
nuclear@67: 			return 0;
nuclear@67: 		}
nuclear@67: 	}
nuclear@67: 	return track;
nuclear@67: }
nuclear@67: 
nuclear@67: void anm_free_track(struct anm_track *track)
nuclear@67: {
nuclear@67: 	anm_destroy_track(track);
nuclear@67: 	free(track);
nuclear@67: }
nuclear@67: 
nuclear@67: int anm_set_track_name(struct anm_track *track, const char *name)
nuclear@67: {
nuclear@67: 	char *tmp;
nuclear@67: 
nuclear@67: 	if(!(tmp = malloc(strlen(name) + 1))) {
nuclear@67: 		return -1;
nuclear@67: 	}
nuclear@67: 	free(track->name);
nuclear@67: 	track->name = tmp;
nuclear@67: 	return 0;
nuclear@67: }
nuclear@67: 
nuclear@67: const char *anm_get_track_name(struct anm_track *track)
nuclear@67: {
nuclear@67: 	return track->name;
nuclear@67: }
nuclear@67: 
nuclear@67: void anm_set_track_interpolator(struct anm_track *track, enum anm_interpolator in)
nuclear@67: {
nuclear@67: 	track->interp = in;
nuclear@67: }
nuclear@67: 
nuclear@67: void anm_set_track_extrapolator(struct anm_track *track, enum anm_extrapolator ex)
nuclear@67: {
nuclear@67: 	track->extrap = ex;
nuclear@67: }
nuclear@67: 
nuclear@67: anm_time_t anm_remap_time(struct anm_track *track, anm_time_t tm, anm_time_t start, anm_time_t end)
nuclear@67: {
nuclear@67: 	return remap_time[track->extrap](tm, start, end);
nuclear@67: }
nuclear@67: 
nuclear@67: void anm_set_track_default(struct anm_track *track, float def)
nuclear@67: {
nuclear@67: 	track->def_val = def;
nuclear@67: }
nuclear@67: 
nuclear@67: int anm_set_keyframe(struct anm_track *track, struct anm_keyframe *key)
nuclear@67: {
nuclear@67: 	int idx = anm_get_key_interval(track, key->time);
nuclear@67: 
nuclear@67: 	/* if we got a valid keyframe index, compare them... */
nuclear@67: 	if(idx >= 0 && idx < track->count && keycmp(key, track->keys + idx) == 0) {
nuclear@67: 		/* ... it's the same key, just update the value */
nuclear@67: 		track->keys[idx].val = key->val;
nuclear@67: 	} else {
nuclear@67: 		/* ... it's a new key, add it and re-sort them */
nuclear@67: 		void *tmp;
nuclear@67: 		if(!(tmp = dynarr_push(track->keys, key))) {
nuclear@67: 			return -1;
nuclear@67: 		}
nuclear@67: 		track->keys = tmp;
nuclear@67: 		/* TODO lazy qsort */
nuclear@67: 		qsort(track->keys, ++track->count, sizeof *track->keys, keycmp);
nuclear@67: 	}
nuclear@67: 	return 0;
nuclear@67: }
nuclear@67: 
nuclear@67: static int keycmp(const void *a, const void *b)
nuclear@67: {
nuclear@67: 	return ((struct anm_keyframe*)a)->time - ((struct anm_keyframe*)b)->time;
nuclear@67: }
nuclear@67: 
nuclear@67: struct anm_keyframe *anm_get_keyframe(struct anm_track *track, int idx)
nuclear@67: {
nuclear@67: 	if(idx < 0 || idx >= track->count) {
nuclear@67: 		return 0;
nuclear@67: 	}
nuclear@67: 	return track->keys + idx;
nuclear@67: }
nuclear@67: 
nuclear@67: int anm_get_key_interval(struct anm_track *track, anm_time_t tm)
nuclear@67: {
nuclear@67: 	int last;
nuclear@67: 
nuclear@67: 	if(!track->count || tm < track->keys[0].time) {
nuclear@67: 		return -1;
nuclear@67: 	}
nuclear@67: 
nuclear@67: 	last = track->count - 1;
nuclear@67: 	if(tm > track->keys[last].time) {
nuclear@67: 		return last;
nuclear@67: 	}
nuclear@67: 
nuclear@67: 	return find_prev_key(track->keys, 0, last, tm);
nuclear@67: }
nuclear@67: 
nuclear@67: static int find_prev_key(struct anm_keyframe *arr, int start, int end, anm_time_t tm)
nuclear@67: {
nuclear@67: 	int mid;
nuclear@67: 
nuclear@67: 	if(end - start <= 1) {
nuclear@67: 		return start;
nuclear@67: 	}
nuclear@67: 
nuclear@67: 	mid = (start + end) / 2;
nuclear@67: 	if(tm < arr[mid].time) {
nuclear@67: 		return find_prev_key(arr, start, mid, tm);
nuclear@67: 	}
nuclear@67: 	if(tm > arr[mid].time) {
nuclear@67: 		return find_prev_key(arr, mid, end, tm);
nuclear@67: 	}
nuclear@67: 	return mid;
nuclear@67: }
nuclear@67: 
nuclear@67: int anm_set_value(struct anm_track *track, anm_time_t tm, float val)
nuclear@67: {
nuclear@67: 	struct anm_keyframe key;
nuclear@67: 	key.time = tm;
nuclear@67: 	key.val = val;
nuclear@67: 
nuclear@67: 	return anm_set_keyframe(track, &key);
nuclear@67: }
nuclear@67: 
nuclear@67: float anm_get_value(struct anm_track *track, anm_time_t tm)
nuclear@67: {
nuclear@67: 	int idx0, idx1, last_idx;
nuclear@67: 	anm_time_t tstart, tend;
nuclear@67: 	float t, dt;
nuclear@67: 	float v0, v1, v2, v3;
nuclear@67: 
nuclear@67: 	if(!track->count) {
nuclear@67: 		return track->def_val;
nuclear@67: 	}
nuclear@67: 
nuclear@67: 	last_idx = track->count - 1;
nuclear@67: 
nuclear@67: 	tstart = track->keys[0].time;
nuclear@67: 	tend = track->keys[last_idx].time;
nuclear@67: 
nuclear@67: 	if(tstart == tend) {
nuclear@67: 		return track->keys[0].val;
nuclear@67: 	}
nuclear@67: 
nuclear@67: 	tm = remap_time[track->extrap](tm, tstart, tend);
nuclear@67: 
nuclear@67: 	idx0 = anm_get_key_interval(track, tm);
nuclear@67: 	assert(idx0 >= 0 && idx0 < track->count);
nuclear@67: 	idx1 = idx0 + 1;
nuclear@67: 
nuclear@67: 	if(idx0 == last_idx) {
nuclear@67: 		return track->keys[idx0].val;
nuclear@67: 	}
nuclear@67: 
nuclear@67: 	dt = (float)(track->keys[idx1].time - track->keys[idx0].time);
nuclear@67: 	t = (float)(tm - track->keys[idx0].time) / dt;
nuclear@67: 
nuclear@67: 	v1 = track->keys[idx0].val;
nuclear@67: 	v2 = track->keys[idx1].val;
nuclear@67: 
nuclear@67: 	/* get the neigboring values to allow for cubic interpolation */
nuclear@67: 	v0 = idx0 > 0 ? track->keys[idx0 - 1].val : v1;
nuclear@67: 	v3 = idx1 < last_idx ? track->keys[idx1 + 1].val : v2;
nuclear@67: 
nuclear@67: 	return interp[track->interp](v0, v1, v2, v3, t);
nuclear@67: }
nuclear@67: 
nuclear@67: 
nuclear@67: static float interp_step(float v0, float v1, float v2, float v3, float t)
nuclear@67: {
nuclear@67: 	return v1;
nuclear@67: }
nuclear@67: 
nuclear@67: static float interp_linear(float v0, float v1, float v2, float v3, float t)
nuclear@67: {
nuclear@67: 	return v1 + (v2 - v1) * t;
nuclear@67: }
nuclear@67: 
nuclear@67: static float interp_cubic(float a, float b, float c, float d, float t)
nuclear@67: {
nuclear@67: 	float x, y, z, w;
nuclear@67: 	float tsq = t * t;
nuclear@67: 
nuclear@67: 	x = -a + 3.0 * b - 3.0 * c + d;
nuclear@67: 	y = 2.0 * a - 5.0 * b + 4.0 * c - d;
nuclear@67: 	z = c - a;
nuclear@67: 	w = 2.0 * b;
nuclear@67: 
nuclear@67: 	return 0.5 * (x * tsq * t + y * tsq + z * t + w);
nuclear@67: }
nuclear@67: 
nuclear@67: static anm_time_t remap_extend(anm_time_t tm, anm_time_t start, anm_time_t end)
nuclear@67: {
nuclear@67: 	return remap_repeat(tm, start, end);
nuclear@67: }
nuclear@67: 
nuclear@67: static anm_time_t remap_clamp(anm_time_t tm, anm_time_t start, anm_time_t end)
nuclear@67: {
nuclear@67: 	return tm < start ? start : (tm >= end ? end - 1 : tm);
nuclear@67: }
nuclear@67: 
nuclear@67: static anm_time_t remap_repeat(anm_time_t tm, anm_time_t start, anm_time_t end)
nuclear@67: {
nuclear@67: 	anm_time_t interv = end - start;
nuclear@67: 
nuclear@67: 	if(tm < start) {
nuclear@67: 		while(tm < start) {
nuclear@67: 			tm += interv;
nuclear@67: 		}
nuclear@67: 		return tm;
nuclear@67: 	}
nuclear@67: 	return (tm - start) % interv + start;
nuclear@67: }