uxn

commit 253c2b89063e5f84164d937907f938e13642d513
parent 43cde08b68a7e6c880b01fa736dccbaa47f5707c
Author: Andrew Alderwick <andrew@alderwick.co.uk>
Date:   Tue, 13 Apr 2021 21:54:18 +0100

Made Audio.value unsigned

Diffstat:
M
projects/examples/dev.audio.usm
 | 
16
++++++++--------
M
src/apu.c
 | 
3
++-
M
src/apu.h
 | 
2
+-
M
src/emulator.c
 | 
5
++++-

4 files changed, 15 insertions(+), 11 deletions(-)
diff --git a/projects/examples/dev.audio.usm b/projects/examples/dev.audio.usm
@@ -470,24 +470,24 @@ RTN
 RTN
 
 @adsr-envelope ( -- )
-	#7f ,adsr #00 ~Audio.play #04 MUL ADD2 PEK2 SOUND
-	#40 ,adsr #00 ~Audio.play #04 MUL ADD2 #0001 ADD2 PEK2 SOUND
-	#40 ,adsr #00 ~Audio.play #04 MUL ADD2 #0002 ADD2 PEK2 SOUND
+	#ff ,adsr #00 ~Audio.play #04 MUL ADD2 PEK2 SOUND
+	#80 ,adsr #00 ~Audio.play #04 MUL ADD2 #0001 ADD2 PEK2 SOUND
+	#80 ,adsr #00 ~Audio.play #04 MUL ADD2 #0002 ADD2 PEK2 SOUND
 	#00 ,adsr #00 ~Audio.play #04 MUL ADD2 #0003 ADD2 PEK2 SOUND
 	SOUND_FINISH
 	BRK
 
 @square-wave ( -- )
-	#5800 SOUND
-	#5880 SOUND
 	#a800 SOUND
 	#a880 SOUND
+	#5800 SOUND
+	#5880 SOUND
 	BRK
 
 @triangle-wave ( -- )
-	#7f40 SOUND
-	#8180 SOUND
-	#0040 SOUND
+	#ff40 SOUND
+	#0080 SOUND
+	#8040 SOUND
 	BRK
 
 @ch1_txt [ CHN0 00 ]
diff --git a/src/apu.c b/src/apu.c
@@ -87,9 +87,10 @@ apu_play_note(Note *note, Uint16 wave_vector, Uint16 envelope_vector, Uint8 volu
 	for(i = 0; i < 2; ++i) {
 		note->volume[i] = 0xf & (volume >> 4 * (1 - i));
 		note->wv[i].count = note->wv[i].period = 0;
-		note->wv[i].end_value = 0;
+		note->wv[i].end_value = 0x8000 * (1 - i);
 		note->wv[i].queue.n = note->wv[i].queue.i = 0;
 		note->wv[i].queue.finishes = 0;
+		note->wv[i].queue.is_envelope = i;
 	}
 	note->wv[0].vector = wave_vector;
 	note->wv[0].advance = note_advances[pitch % 12] >> (8 - pitch / 12);
diff --git a/src/apu.h b/src/apu.h
@@ -17,7 +17,7 @@ typedef signed int Sint32;
 
 typedef struct {
 	Uint16 *dat;
-	Uint8 i, n, sz, finishes;
+	Uint8 i, n, sz, finishes, is_envelope;
 } Queue;
 
 typedef struct {
diff --git a/src/emulator.c b/src/emulator.c
@@ -253,7 +253,10 @@ audio_poke(Uxn *u, Uint16 ptr, Uint8 b0, Uint8 b1)
 			apu.queue->sz = apu.queue->sz < 4 ? 4 : apu.queue->sz * 2;
 			apu.queue->dat = SDL_realloc(apu.queue->dat, apu.queue->sz * sizeof(*apu.queue->dat));
 		}
-		apu.queue->dat[apu.queue->n++] = (m[0xb] << 8) + m[0xc];
+		if(apu.queue->is_envelope)
+			apu.queue->dat[apu.queue->n++] = (m[0xb] << 7) + (m[0xc] >> 1);
+		else
+			apu.queue->dat[apu.queue->n++] = (m[0xb] << 8) + m[0xc] + 0x8000;
 		apu.queue->dat[apu.queue->n++] = (m[0xd] << 8) + b1;
 	} else if(b0 == 0xf && apu.queue != NULL)
 		apu.queue->finishes = 1;