nuclear@9: #include <stdio.h>
nuclear@9: #include <math.h>
nuclear@9: #include <stdlib.h>
nuclear@9: #include <string.h>
nuclear@9: #include <ctype.h>
nuclear@9: #include <errno.h>
nuclear@9: #include "dsys.h"
nuclear@9: #include "dsys_impl.h"
nuclear@9: 
nuclear@9: static int read_script(struct dsys_demo *demo, FILE *fp, const char *fname);
nuclear@9: static char *strip_ws(char *buf);
nuclear@9: static void dbg_print_events(struct dsys_event *ev);
nuclear@9: 
nuclear@9: static void proc_event(struct dsys_event *ev, demotime_t tm);
nuclear@9: static void link_callback(struct dsys_event *ev, void *cls);
nuclear@9: static void free_event(struct dsys_event *ev);
nuclear@9: 
nuclear@9: static struct dsys_event *sort_evlist(struct dsys_event *list, int num_ev);
nuclear@9: static struct dsys_event *merge_evlists(struct dsys_event *list1, struct dsys_event *list2);
nuclear@9: 
nuclear@9: 
nuclear@9: struct dsys_demo *dsys_open(const char *fname)
nuclear@9: {
nuclear@9: 	FILE *fp;
nuclear@9: 	struct dsys_demo *demo;
nuclear@9: 
nuclear@9: 	if(!(fp = fopen(fname, "r"))) {
nuclear@9: 		fprintf(stderr, "failed to open demoscript: %s: %s\n", fname, strerror(errno));
nuclear@9: 		return 0;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	if(!(demo = malloc(sizeof *demo))) {
nuclear@9: 		perror("failed to allocate memory");
nuclear@9: 		fclose(fp);
nuclear@9: 		return 0;
nuclear@9: 	}
nuclear@9: 	memset(demo, 0, sizeof *demo);
nuclear@9: 
nuclear@9: 	demo->src_tm = demo->start_tm = -1;
nuclear@9: 
nuclear@9: 	if(read_script(demo, fp, fname) == -1) {
nuclear@9: 		free(demo);
nuclear@9: 		fclose(fp);
nuclear@9: 		return 0;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	fclose(fp);
nuclear@9: 	return demo;
nuclear@9: }
nuclear@9: 
nuclear@9: struct dsys_demo *dsys_open_stream(FILE *fp)
nuclear@9: {
nuclear@9: 	struct dsys_demo *demo;
nuclear@9: 
nuclear@9: 	if(!(demo = malloc(sizeof *demo))) {
nuclear@9: 		perror("failed to allocate memory");
nuclear@9: 		return 0;
nuclear@9: 	}
nuclear@9: 	memset(demo, 0, sizeof *demo);
nuclear@9: 
nuclear@9: 	demo->src_tm = demo->start_tm = -1;
nuclear@9: 
nuclear@9: 	if(read_script(demo, fp, 0) == -1) {
nuclear@9: 		free(demo);
nuclear@9: 		return 0;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	return demo;
nuclear@9: }
nuclear@9: 
nuclear@9: void dsys_close(struct dsys_demo *demo)
nuclear@9: {
nuclear@9: 	while(demo->evlist) {
nuclear@9: 		struct dsys_event *ev = demo->evlist;
nuclear@9: 		demo->evlist = demo->evlist->next;
nuclear@9: 		free_event(ev);
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	free(demo);
nuclear@9: }
nuclear@9: 
nuclear@9: 
nuclear@9: #define SEP	" \t\n\r"
nuclear@9: 
nuclear@9: static int read_script(struct dsys_demo *demo, FILE *fp, const char *fname)
nuclear@9: {
nuclear@9: 	int nline = 0;
nuclear@9: 	char buf[512], *line, *tok, *endp;
nuclear@9: 	unsigned int t0, t1;
nuclear@9: 	struct dsys_event *ev;
nuclear@9: 
nuclear@9: 	if(!fname) {
nuclear@9: 		fname = "<unknown>";
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	demo->duration = dsys_msec_to_dtime(0);
nuclear@9: 
nuclear@9: 	while(fgets(buf, sizeof buf, fp)) {
nuclear@9: 		nline++;
nuclear@9: 
nuclear@9: 		line = strip_ws(buf);
nuclear@9: 
nuclear@9: 		if(!line || !*line) {
nuclear@9: 			continue;
nuclear@9: 		}
nuclear@9: 
nuclear@9: 		if(!(tok = strtok(line, SEP)) || (t0 = strtol(tok, &endp, 10), endp == tok)) {
nuclear@9: 			fprintf(stderr, "%s line: %d, error: expected timestamp t0\n", fname, nline);
nuclear@9: 			return -1;
nuclear@9: 		}
nuclear@9: 
nuclear@9: 		if(!(tok = strtok(0, SEP))) {
nuclear@9: 			fprintf(stderr, "%s line: %d, error: expected second timestamp or event name\n", fname, nline);
nuclear@9: 			return -1;
nuclear@9: 		}
nuclear@9: 
nuclear@9: 		t1 = strtol(tok, &endp, 10);
nuclear@9: 		if(endp == tok) {
nuclear@9: 			t1 = t0;
nuclear@9: 		} else {
nuclear@9: 			if(!(tok = strtok(0, SEP))) {
nuclear@9: 				fprintf(stderr, "%s line: %d, error: expected event name\n", fname, nline);
nuclear@9: 				return -1;
nuclear@9: 			}
nuclear@9: 		}
nuclear@9: 
nuclear@9: 		if(!(ev = malloc(sizeof *ev))) {
nuclear@9: 			perror("read_script: failed to allocate memory for an event\n");
nuclear@9: 			return -1;
nuclear@9: 		}
nuclear@9: 		memset(ev, 0, sizeof *ev);
nuclear@9: 		ev->t0 = dsys_msec_to_dtime(t0);
nuclear@9: 		ev->t1 = dsys_msec_to_dtime(t1);
nuclear@9: 
nuclear@9: 		if(!(ev->name = malloc(strlen(tok) + 1))) {
nuclear@9: 			free(ev);
nuclear@9: 			fprintf(stderr, "read_script: failed to allocate memory for the event name: %s\n", tok);
nuclear@9: 			return -1;
nuclear@9: 		}
nuclear@9: 		strcpy(ev->name, tok);
nuclear@9: 
nuclear@9: 		ev->eval = t0 == t1 ? dsys_eval_step : dsys_eval_lerp;
nuclear@9: 
nuclear@9: 		ev->next = demo->evlist;
nuclear@9: 		ev->prev = 0;
nuclear@9: 		if(demo->evlist) {
nuclear@9: 			demo->evlist->prev = ev;
nuclear@9: 		}
nuclear@9: 		demo->evlist = ev;
nuclear@9: 		demo->num_ev++;
nuclear@9: 
nuclear@9: 		if(ev->t1 > demo->duration) {
nuclear@9: 			demo->duration = ev->t1;
nuclear@9: 		}
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	demo->evlist = sort_evlist(demo->evlist, demo->num_ev);
nuclear@9: 
nuclear@9: 	/*dbg_print_events(demo->evlist);*/
nuclear@9: 
nuclear@9: 	return 0;
nuclear@9: }
nuclear@9: 
nuclear@9: static char *strip_ws(char *buf)
nuclear@9: {
nuclear@9: 	char *ptr;
nuclear@9: 
nuclear@9: 	while(isspace(*buf)) {
nuclear@9: 		buf++;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	ptr = buf;
nuclear@9: 	while(*ptr) {
nuclear@9: 		if(*ptr == '\n' || *ptr == '\r' || *ptr == '#') {
nuclear@9: 			*ptr = 0;
nuclear@9: 			break;
nuclear@9: 		}
nuclear@9: 		ptr++;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	return buf;
nuclear@9: }
nuclear@9: 
nuclear@9: static void dbg_print_events(struct dsys_event *ev)
nuclear@9: {
nuclear@9: 	int i;
nuclear@9: 
nuclear@9: 	for(i=0; ev; i++) {
nuclear@9: 		printf("%02d - %s (%f -> %f) [%s]\n", i, ev->eval == dsys_eval_step ? "step" : "lerp",
nuclear@9: 				ev->t0, ev->t1, ev->name);
nuclear@9: 		ev = ev->next;
nuclear@9: 	}
nuclear@9: }
nuclear@9: 
nuclear@9: void dsys_update(struct dsys_demo *demo, demotime_t tm)
nuclear@9: {
nuclear@9: 	struct dsys_event *ev;
nuclear@9: 
nuclear@9: 	demo->src_tm = tm;
nuclear@9: 
nuclear@9: 	if(demo->start_tm == -1) {
nuclear@9: 		dsys_start(demo);
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	if(!demo->running) {
nuclear@9: 		return;	/* nothing changes */
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	demo->tm = tm - demo->start_tm - demo->stoppage_tm;
nuclear@9: 
nuclear@9: 	if(demo->tm < 0) {
nuclear@9: 		demo->tm = 0;
nuclear@9: 	}
nuclear@9: 	if(demo->tm > demo->duration) {
nuclear@9: 		demo->tm = demo->duration;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	while(demo->active && demo->active->t1 <= demo->tm) {
nuclear@9: 		proc_event(demo->active, demo->tm);
nuclear@9: 		demo->active = demo->active->next;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	ev = demo->active;
nuclear@9: 	while(ev && ev->t0 <= demo->tm) {
nuclear@9: 		proc_event(ev, demo->tm);
nuclear@9: 		ev = ev->next;
nuclear@9: 	}
nuclear@9: 	demo->nextev = ev;
nuclear@9: 
nuclear@9: 
nuclear@9: 	if(demo->tm >= demo->duration) {
nuclear@9: 		dsys_stop(demo);
nuclear@9: 	}
nuclear@9: }
nuclear@9: 
nuclear@9: static void proc_event(struct dsys_event *ev, demotime_t tm)
nuclear@9: {
nuclear@9: 	float val = ev->eval(ev, tm);
nuclear@9: 
nuclear@9: 	if(ev->val != val) {
nuclear@9: 		struct callback *cb = ev->cblist;
nuclear@9: 
nuclear@9: 		ev->val = val;
nuclear@9: 
nuclear@9: 		while(cb) {
nuclear@9: 			cb->func(ev, cb->cls);
nuclear@9: 			cb = cb->next;
nuclear@9: 		}
nuclear@9: 	}
nuclear@9: }
nuclear@9: 
nuclear@9: void dsys_start(struct dsys_demo *demo)
nuclear@9: {
nuclear@9: 	if(demo->running) {
nuclear@9: 		return;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	if(demo->start_tm == -1) {
nuclear@9: 		demo->start_tm = demo->src_tm;
nuclear@9: 		demo->nextev = demo->active = demo->evlist;
nuclear@9: 	} else {
nuclear@9: 		demo->stoppage_tm += demo->src_tm - demo->stop_tm;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	demo->running = 1;
nuclear@9: }
nuclear@9: 
nuclear@9: void dsys_stop(struct dsys_demo *demo)
nuclear@9: {
nuclear@9: 	if(!demo->running) {
nuclear@9: 		return;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	demo->stop_tm = demo->src_tm;
nuclear@9: 	demo->running = 0;
nuclear@9: }
nuclear@9: 
nuclear@9: int dsys_is_running(struct dsys_demo *demo)
nuclear@9: {
nuclear@9: 	return demo->running;
nuclear@9: }
nuclear@9: 
nuclear@9: 
nuclear@9: demotime_t dsys_duration(struct dsys_demo *demo)
nuclear@9: {
nuclear@9: 	return demo->duration;
nuclear@9: }
nuclear@9: 
nuclear@9: demotime_t dsys_time(struct dsys_demo *demo)
nuclear@9: {
nuclear@9: 	return demo->tm;
nuclear@9: }
nuclear@9: 
nuclear@9: float dsys_progress(struct dsys_demo *demo)
nuclear@9: {
nuclear@9: 	return demo->tm / demo->duration;
nuclear@9: }
nuclear@9: 
nuclear@9: /* seek without continuity */
nuclear@9: void dsys_seek(struct dsys_demo *demo, demotime_t tm)
nuclear@9: {
nuclear@9: 	struct dsys_event *ev;
nuclear@9: 
nuclear@9: 	if(tm < 0) {
nuclear@9: 		tm = 0;
nuclear@9: 	}
nuclear@9: 	if(tm > demo->duration) {
nuclear@9: 		tm = demo->duration;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	if(tm < demo->tm) {
nuclear@9: 		/* on backwards seek, invalidate the sliding window */
nuclear@9: 		demo->nextev = demo->active = demo->evlist;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	demo->start_tm = demo->src_tm - tm;
nuclear@9: 	demo->stoppage_tm = 0;
nuclear@9: 	demo->stop_tm = demo->src_tm;
nuclear@9: 	demo->tm = tm;
nuclear@9: 
nuclear@9: 	/* recalculate events */
nuclear@9: 	ev = demo->evlist;
nuclear@9: 	while(ev) {
nuclear@9: 		proc_event(ev, tm);
nuclear@9: 		ev = ev->next;
nuclear@9: 	}
nuclear@9: }
nuclear@9: 
nuclear@9: void dsys_seek_norm(struct dsys_demo *demo, float t)
nuclear@9: {
nuclear@9: 	dsys_seek(demo, t * demo->duration);
nuclear@9: }
nuclear@9: 
nuclear@9: /* seek by accelerating time */
nuclear@9: void dsys_warp(struct dsys_demo *demo, demotime_t tm)
nuclear@9: {
nuclear@9: 	fprintf(stderr, "dsys_warp not implemented yet\n");
nuclear@9: }
nuclear@9: 
nuclear@9: void dsys_warp_norm(struct dsys_demo *demo, float t)
nuclear@9: {
nuclear@9: 	dsys_warp(demo, t * demo->duration);
nuclear@9: }
nuclear@9: 
nuclear@9: 
nuclear@9: /* events */
nuclear@9: struct dsys_event *dsys_event(struct dsys_demo *demo, const char *name)
nuclear@9: {
nuclear@9: 	struct dsys_event *iter = demo->evlist;
nuclear@9: 
nuclear@9: 	while(iter) {
nuclear@9: 		if(strcmp(iter->name, name) == 0) {
nuclear@9: 			return iter;
nuclear@9: 		}
nuclear@9: 		iter = iter->next;
nuclear@9: 	}
nuclear@9: 	return 0;
nuclear@9: }
nuclear@9: 
nuclear@11: void dsys_set_event_eval(struct dsys_event *ev, float (*eval)(struct dsys_event*, demotime_t))
nuclear@11: {
nuclear@11: 	ev->eval = eval;
nuclear@11: }
nuclear@11: 
nuclear@9: enum dsys_evtype dsys_event_type(struct dsys_event *ev)
nuclear@9: {
nuclear@9: 	return ev->type;
nuclear@9: }
nuclear@9: 
nuclear@9: float dsys_event_value(struct dsys_event *ev)
nuclear@9: {
nuclear@9: 	return ev->val;
nuclear@9: }
nuclear@9: 
nuclear@9: int dsys_event_callback(struct dsys_event *ev, void (*func)(struct dsys_event*, void*), void *cls)
nuclear@9: {
nuclear@9: 	struct callback *cb;
nuclear@9: 
nuclear@9: 	if(!(cb = malloc(sizeof *cb))) {
nuclear@9: 		perror("failed to allocate memory");
nuclear@9: 		return -1;
nuclear@9: 	}
nuclear@9: 	cb->func = func;
nuclear@9: 	cb->cls = cls;
nuclear@9: 	cb->next = ev->cblist;
nuclear@9: 	ev->cblist = cb;
nuclear@9: 	return 0;
nuclear@9: }
nuclear@9: 
nuclear@9: int dsys_event_link(struct dsys_event *ev, float *link)
nuclear@9: {
nuclear@9: 	return dsys_event_callback(ev, link_callback, link);
nuclear@9: }
nuclear@9: 
nuclear@9: static void link_callback(struct dsys_event *ev, void *cls)
nuclear@9: {
nuclear@9: 	*(float*)cls = ev->val;
nuclear@9: }
nuclear@9: 
nuclear@9: 
nuclear@9: /* time conversion */
nuclear@9: demotime_t dsys_sec_to_dtime(float sec)
nuclear@9: {
nuclear@9: 	return sec;
nuclear@9: }
nuclear@9: 
nuclear@9: demotime_t dsys_msec_to_dtime(unsigned long msec)
nuclear@9: {
nuclear@9: 	return (demotime_t)msec / 1000.0;
nuclear@9: }
nuclear@9: 
nuclear@9: float dsys_dtime_to_sec(demotime_t tm)
nuclear@9: {
nuclear@9: 	return tm;
nuclear@9: }
nuclear@9: 
nuclear@9: unsigned long dsys_dtime_to_msec(demotime_t tm)
nuclear@9: {
nuclear@9: 	return (unsigned long)(tm * 1000.0);
nuclear@9: }
nuclear@9: 
nuclear@9: 
nuclear@9: float dsys_eval_step(struct dsys_event *ev, demotime_t t)
nuclear@9: {
nuclear@9: 	return t >= ev->t1 ? 1.0 : 0.0;
nuclear@9: }
nuclear@9: 
nuclear@9: #define CLAMP(x, low, high)	((x) < (low) ? (low) : ((x) > (high) ? (high) : (x)))
nuclear@9: 
nuclear@9: float dsys_eval_lerp(struct dsys_event *ev, demotime_t t)
nuclear@9: {
nuclear@9: 	float res = (t - ev->t0) / (ev->t1 - ev->t0);
nuclear@9: 	return CLAMP(res, 0.0, 1.0);
nuclear@9: }
nuclear@9: 
nuclear@9: float dsys_eval_sigmoid(struct dsys_event *ev, demotime_t t)
nuclear@9: {
nuclear@9: 	t = dsys_eval_lerp(ev, t);
nuclear@9: 	return 1.0 - (cos(t * M_PI) * 0.5 + 0.5);
nuclear@9: }
nuclear@9: 
nuclear@9: static void free_event(struct dsys_event *ev)
nuclear@9: {
nuclear@9: 	while(ev->cblist) {
nuclear@9: 		struct callback *cb = ev->cblist;
nuclear@9: 		ev->cblist = ev->cblist->next;
nuclear@9: 		free(cb);
nuclear@9: 	}
nuclear@9: }
nuclear@9: 
nuclear@9: static struct dsys_event *sort_evlist(struct dsys_event *list, int num_ev)
nuclear@9: {
nuclear@9: 	int i, num_left, num_right;
nuclear@9: 	struct dsys_event *left, *right, *node = list;
nuclear@9: 
nuclear@9: 	if(num_ev < 2) {
nuclear@9: 		return list;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	num_left = num_ev / 2;
nuclear@9: 	num_right = num_ev - num_left;
nuclear@9: 
nuclear@9: 	for(i=0; i<num_ev/2; i++) {
nuclear@9: 		node = node->next;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	if(node->prev) {
nuclear@9: 		node->prev->next = 0;
nuclear@9: 		node->prev = 0;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	left = sort_evlist(list, num_left);
nuclear@9: 	right = sort_evlist(node, num_right);
nuclear@9: 
nuclear@9: 	return merge_evlists(left, right);
nuclear@9: }
nuclear@9: 
nuclear@9: static struct dsys_event *merge_evlists(struct dsys_event *list1, struct dsys_event *list2)
nuclear@9: {
nuclear@9: 	struct dsys_event *head, *tail, *node;
nuclear@9: 
nuclear@9: 	if(!list1) {
nuclear@9: 		return list2;
nuclear@9: 	}
nuclear@9: 	if(!list2) {
nuclear@9: 		return list1;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	head = tail = 0;
nuclear@9: 
nuclear@9: 	while(list1 && list2) {
nuclear@9: 		if(list1->t0 < list2->t0) {
nuclear@9: 			node = list1;
nuclear@9: 			list1 = list1->next;
nuclear@9: 		} else {
nuclear@9: 			node = list2;
nuclear@9: 			list2 = list2->next;
nuclear@9: 		}
nuclear@9: 
nuclear@9: 		node->next = 0;
nuclear@9: 		node->prev = tail;
nuclear@9: 
nuclear@9: 		if(!head) {
nuclear@9: 			head = node;
nuclear@9: 		} else {
nuclear@9: 			tail->next = node;
nuclear@9: 		}
nuclear@9: 		tail = node;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	if(list1) {
nuclear@9: 		tail->next = list1;
nuclear@9: 		list1->prev = tail;
nuclear@9: 	} else if(list2) {
nuclear@9: 		tail->next = list2;
nuclear@9: 		list2->prev = tail;
nuclear@9: 	}
nuclear@9: 
nuclear@9: 	return head;
nuclear@9: }