Make the UxnAudio struct private to audio.c.

src/devices/audio.c

@@ -16,6 +16,14 @@ WITH REGARD TO THIS SOFTWARE.
 #define NOTE_PERIOD (SAMPLE_FREQUENCY * 0x4000 / 11025)
 #define ADSR_STEP (SAMPLE_FREQUENCY / 0xf)
 
+typedef struct {
+	Uint8 *addr;
+	Uint32 count, advance, period, age, a, d, s, r;
+	Uint16 i, len;
+	Sint8 volume[2];
+	Uint8 pitch, repeat;
+} UxnAudio;
+
 /* clang-format off */
 
 static Uint32 advances[12] = {
@@ -40,8 +48,9 @@ envelope(UxnAudio *c, Uint32 age)
 }
 
 int
-audio_render(UxnAudio *c, Sint16 *sample, Sint16 *end)
+audio_render(int instance, Sint16 *sample, Sint16 *end)
 {
+	UxnAudio *c = &uxn_audio[instance];
 	Sint32 s;
 	if(!c->advance || !c->period) return 0;
 	while(sample < end) {
@@ -59,13 +68,26 @@ audio_render(UxnAudio *c, Sint16 *sample, Sint16 *end)
 		*sample++ += s * c->volume[0] / 0x180;
 		*sample++ += s * c->volume[1] / 0x180;
 	}
-	if(!c->advance) audio_finished_handler(c);
+	if(!c->advance) audio_finished_handler(instance);
 	return 1;
 }
 
 void
-audio_start(UxnAudio *c, Uint16 adsr, Uint8 pitch)
+audio_start(int instance, Device *d)
 {
+	UxnAudio *c = &uxn_audio[instance];
+	Uint16 addr, adsr;
+	Uint8 pitch;
+	DEVPEEK16(adsr, 0x8);
+	DEVPEEK16(c->len, 0xa);
+	DEVPEEK16(addr, 0xc);
+	if(c->len > 0x10000 - addr)
+		c->len = 0x10000 - addr;
+	c->addr = &d->u->ram[addr];
+	c->volume[0] = d->dat[0xe] >> 4;
+	c->volume[1] = d->dat[0xe] & 0xf;
+	c->repeat = !(d->dat[0xf] & 0x80);
+	pitch = d->dat[0xf] & 0x7f;
 	if(pitch < 108 && c->len)
 		c->advance = advances[pitch % 12] >> (8 - pitch / 12);
 	else {
@@ -85,8 +107,9 @@ audio_start(UxnAudio *c, Uint16 adsr, Uint8 pitch)
 }
 
 Uint8
-audio_get_vu(UxnAudio *c)
+audio_get_vu(int instance)
 {
+	UxnAudio *c = &uxn_audio[instance];
 	int i;
 	Sint32 sum[2] = {0, 0};
 	if(!c->advance || !c->period) return 0;
@@ -97,3 +120,10 @@ audio_get_vu(UxnAudio *c)
 	}
 	return (sum[0] << 4) | sum[1];
 }
+
+Uint16
+audio_get_position(int instance)
+{
+	UxnAudio *c = &uxn_audio[instance];
+	return c->i;
+}

src/devices/audio.h

@@ -15,17 +15,8 @@ typedef signed int Sint32;
 #define SAMPLE_FREQUENCY 44100
 #define POLYPHONY 4
 
-typedef struct {
-	Uint8 *addr;
-	Uint32 count, advance, period, age, a, d, s, r;
-	Uint16 i, len;
-	Sint8 volume[2];
-	Uint8 pitch, repeat;
-} UxnAudio;
-
-extern UxnAudio uxn_audio[POLYPHONY];
-
-Uint8 audio_get_vu(UxnAudio *c);
-int audio_render(UxnAudio *c, Sint16 *sample, Sint16 *end);
-void audio_start(UxnAudio *c, Uint16 adsr, Uint8 pitch);
-void audio_finished_handler(UxnAudio *c);
+Uint8 audio_get_vu(int instance);
+Uint16 audio_get_position(int instance);
+int audio_render(int instance, Sint16 *sample, Sint16 *end);
+void audio_start(int instance, Device *d);
+void audio_finished_handler(int instance);

src/uxnemu.c

@@ -58,21 +58,21 @@ error(char *msg, const char *err)
 static void
 audio_callback(void *u, Uint8 *stream, int len)
 {
-	int i, running = 0;
+	int instance, running = 0;
 	Sint16 *samples = (Sint16 *)stream;
 	SDL_memset(stream, 0, len);
-	for(i = 0; i < POLYPHONY; i++)
-		running += audio_render(&uxn_audio[i], samples, samples + len / 2);
+	for(instance = 0; instance < POLYPHONY; instance++)
+		running += audio_render(instance, samples, samples + len / 2);
 	if(!running)
 		SDL_PauseAudioDevice(audio_id, 1);
 	(void)u;
 }
 
 void
-audio_finished_handler(UxnAudio *c)
+audio_finished_handler(int instance)
 {
 	SDL_Event event;
-	event.type = audio0_event + (c - uxn_audio);
+	event.type = audio0_event + instance;
 	SDL_PushEvent(&event);
 }
 
@@ -185,11 +185,11 @@ console_deo(Device *d, Uint8 port)
 static Uint8
 audio_dei(Device *d, Uint8 port)
 {
-	UxnAudio *c = &uxn_audio[d - devaudio0];
+	int instance = d - devaudio0;
 	if(!audio_id) return d->dat[port];
 	switch(port) {
-	case 0x4: return audio_get_vu(c);
-	case 0x2: DEVPOKE16(0x2, c->i); /* fall through */
+	case 0x4: return audio_get_vu(instance);
+	case 0x2: DEVPOKE16(0x2, audio_get_position(instance)); /* fall through */
 	default: return d->dat[port];
 	}
 }
@@ -197,21 +197,11 @@ audio_dei(Device *d, Uint8 port)
 static void
 audio_deo(Device *d, Uint8 port)
 {
-	UxnAudio *c = &uxn_audio[d - devaudio0];
+	int instance = d - devaudio0;
 	if(!audio_id) return;
 	if(port == 0xf) {
-		Uint16 addr, adsr;
 		SDL_LockAudioDevice(audio_id);
-		DEVPEEK16(adsr, 0x8);
-		DEVPEEK16(c->len, 0xa);
-		DEVPEEK16(addr, 0xc);
-		if(c->len > 0x10000 - addr)
-			c->len = 0x10000 - addr;
-		c->addr = &d->u->ram[addr];
-		c->volume[0] = d->dat[0xe] >> 4;
-		c->volume[1] = d->dat[0xe] & 0xf;
-		c->repeat = !(d->dat[0xf] & 0x80);
-		audio_start(c, adsr, d->dat[0xf] & 0x7f);
+		audio_start(instance, d);
 		SDL_UnlockAudioDevice(audio_id);
 		SDL_PauseAudioDevice(audio_id, 0);
 	}