sounds now have start and end fields

ampler.c

@@ -67,7 +67,8 @@ int ampler_main(SDL_Window *w, SDL_Renderer *r, Ampler_state **u_data) {
 		state -> played_audio_last_frame = audio_frame(state);
 		draw_frame(w, r, state);
 
-		// CLEAR UDP MESSAGES
+		// CLEAR UDP MESSAGES, but only after we've played them
+		if state -> played_audio_last_frame do
 			foreach_ptr(Udp_msg, msg, state -> messages)
 				msg -> state = MSG_FREE;
 

ampler.h

@@ -40,9 +40,11 @@ for ; N##_i < arraylen(ARRAY); N##_i += 1, N = &((ARRAY)[N##_i]) do
 typedef struct Sound_src Sound_src;
 struct Sound_src {
 	s8 *tracks[CHANNELS];
-	s32 len; // in samples
+	s32 track_len; // size of track buffers, in samples
 	f32 pos; // position in samples
 	f32 speed; // in samples, per sample, can be negative
+	s32 start; // play start in samples
+	s32 end; // play end in samples
 	enum { SND_FREE = 0, SND_STOPPED, SND_PLAYING, SND_LOOPING, } state;
 };
 

audio.c

@@ -3,17 +3,48 @@
 // TODO: add something to make sure, we KNOW if we've dropped audio
 // eg. buffer has gone unfilled for a frame or more
 
+void trigger_sounds(Ampler_state *state) {
+	// TODO: Check sound names
+	// TODO: func to decode orca numbers
+
+	// TODO: NOTE SPEED
+	foreach_ptr(Udp_msg, m, state -> messages)
+		if m -> state == MSG_TRIGGER do
+			foreach_ptr(Sound_src, s, state -> sounds)
+				if s -> state == SND_STOPPED do {
+					s -> state = SND_PLAYING;
+					s -> speed = 7.01f;
+					s -> pos = 0.0f;
+					break;
+				}
+				else if s -> state == SND_PLAYING do {
+					s -> speed = -1.51f;
+					break;
+				}
+}
+
 void sound_src_frame(Sound_src *s, s8 *mix[]) {
-	if s -> state == SND_LOOPING do
+	if s -> state == SND_LOOPING or s -> state == SND_PLAYING do
 	for int i = 0; i < FRAME_SAMPLES; i += 1 do {
 		for int c = 0; c < CHANNELS; c += 1 do
 			mix[c][i] += s -> tracks[c][(int) s -> pos];
 
 		s -> pos += s -> speed;
-		while s -> pos < 0.0f do
-			s -> pos += s -> len;
-		while s -> pos >= s -> len do
-			s -> pos -= s -> len;
+
+		if s -> state == SND_LOOPING do {
+			while s -> pos < s -> start do
+				s -> pos += (s->end - s->start);
+			while s -> pos >= s -> end do
+				s -> pos -= (s->end - s->start);
+		}
+
+		// TODO: THIS WILL BREAK REVERSE SOUNDS
+		// FIXME: CHECK SIGN OF SPEED
+		if s -> state == SND_PLAYING do
+			if s->pos < s->start or s->pos >= s->end do {
+				s -> pos = s->start;
+				s -> state = SND_STOPPED;
+			}
 	}
 }
 
@@ -24,6 +55,8 @@ int audio_frame(Ampler_state *state) {
 	if queued > FRAME_SAMPLES * CHANNELS * 2 do return 0;
 	// else puts("queued audio.");
 
+	trigger_sounds(state);
+
 	// TODO: We should use CHANNELS here
 	static s8 mix_l[FRAME_SAMPLES] = { 0 }, mix_r[FRAME_SAMPLES] = { 0 };
 	SDL_memset(mix_l, 0, sizeof mix_l);
@@ -71,20 +104,25 @@ void load_track(Ampler_state *state) {
 	const int chans = spec.channels;
 	const int length = (bytes / sizeof s16) / chans;
 
-	snd -> len = length;
+	snd -> track_len = length;
 	snd -> speed = 1.0f;
 	snd -> pos = 0.0f;
-	// snd -> state = SND_LOOPING;
+	snd -> start = 0;
+	snd -> end = snd->track_len;
 	snd -> state = SND_STOPPED;
 
+	snd -> state = SND_LOOPING;
+	snd -> end /= 2;
+	snd -> start = snd -> end / 2;
+
 	for int i = 0; i < CHANNELS; i += 1 do
-		snd -> tracks[i] = malloc(snd -> len);
+		snd -> tracks[i] = malloc(snd -> track_len);
 
 	for int i = 0; i < CHANNELS; i += 1 do
 		if !(snd -> tracks[i]) do
 			puts("fffuuuck");
 
-	for int i = 0; i < snd -> len; i += 1 do
+	for int i = 0; i < snd -> track_len; i += 1 do
 		for int t = 0; t < chans; t += 1 do
 			snd -> tracks[t][i] = (s8) (buffer[i * chans + t] >> 8);
 

draw.c

@@ -5,6 +5,7 @@ void draw_frame(SDL_Window *w, SDL_Renderer *r, Ampler_state *state) {
 	//SDL_SetRenderDrawColor(r, 10, 10, 10, 100);
 	SDL_RenderClear(r);
 
+	// TODO: DRAW WITH X SCALE FACTOR
 	// TODO: DRAW SMOLER
 	SDL_SetRenderDrawColor(r, 0xFF, 0x00, 0x4D, 255);
 	const space = (44100 * 8) / 512;
@@ -20,9 +21,12 @@ void draw_frame(SDL_Window *w, SDL_Renderer *r, Ampler_state *state) {
 			}
 
 	if state -> played_audio_last_frame do
-	foreach_ptr(Sound_src, snd, state -> sounds) {
+	foreach_ptr(Sound_src, snd, state -> sounds)
+		if snd->state == SND_PLAYING or snd->state == SND_LOOPING do {
 			const int x = snd -> pos / space;
 			SDL_RenderDrawLine(r, x, 0, x, 512);
+			SDL_RenderDrawLine(r, snd->start / space, 0, snd->start / space, 512);
+			SDL_RenderDrawLine(r, snd->end / space, 0, snd->end / space, 512);
 		}
 
 	SDL_RenderPresent(r);