From 32853ce8f7212e301a3c02ec3cba4c614114a46e Mon Sep 17 00:00:00 2001
From: Bad Diode <bd@badd10de.dev>
Date: Tue, 10 Oct 2023 16:06:17 +0200
Subject: [PATCH] Fix xfading issues

---
 projects/examples/devices/audio-tests.tal | 15 ++-------------
 src/devices/audio.c                       | 10 +++-------
 2 files changed, 5 insertions(+), 20 deletions(-)

diff --git a/projects/examples/devices/audio-tests.tal b/projects/examples/devices/audio-tests.tal
index aac6aae..3dd60d9 100644
--- a/projects/examples/devices/audio-tests.tal
+++ b/projects/examples/devices/audio-tests.tal
@@ -16,7 +16,6 @@
 
 |0000
 
-@progress0  $1
 @progress1  $1
 @progress2  $1
 @progress3  $1
@@ -31,6 +30,7 @@
 	( vectors )
 	;on-frame  .Screen/vector DEO2
 	;on-button .Controller/vector DEO2
+	#0000      .Audio1/vector DEO2
 	;on-audio1 .Audio1/vector DEO2
 	;on-audio2 .Audio2/vector DEO2
 	;on-audio3 .Audio3/vector DEO2
@@ -44,7 +44,6 @@
 	#f0     .Audio0/decay    DEO
 	#ff     .Audio0/sustain  DEO
 	#1e     .Audio0/release  DEO
-	#00e8   .Audio0/duration DEO2
 
 	;sine   .Audio1/addr     DEO2
 	#0054   .Audio1/length   DEO2
@@ -71,7 +70,7 @@
 	#f0     .Audio3/decay    DEO
 	#00     .Audio3/sustain  DEO
 	#1e     .Audio3/release  DEO
-	#03e0   .Audio3/duration DEO2
+	#00e8   .Audio3/duration DEO2
 BRK
 
 @on-button ( -> )
@@ -84,16 +83,6 @@ BRK
 	#3c     .Audio0/pitch    DEO
 BRK
 
-@on-audio0 ( -> )
-    ( load next note )
-	.progress0 LDZ
-	( increment note counter )
-	DUP INC #1f AND .progress0 STZ
-    ( play note )
-    GET-NOTE
-	.Audio0/pitch DEO
-BRK
-
 @on-audio1 ( -> )
     ( load next note )
 	.progress1 LDZ
diff --git a/src/devices/audio.c b/src/devices/audio.c
index 7696016..b897571 100644
--- a/src/devices/audio.c
+++ b/src/devices/audio.c
@@ -2612,19 +2612,16 @@ audio_handler(void *ctx, Uint8 *out_stream, int len) {
         Uint8 *addr = &u->dev[device];
         if (channel[n].duration <= 0 && PEEK2(addr)) {
 			uxn_eval(u, PEEK2(addr));
-            // printf("EVAL: %x\n", device);
-            // printf("ADDR: %x\n", PEEK2(addr));
-            // printf("----\n");
         }
         channel[n].duration -= SOUND_TIMER;
 
         int x = 0;
         if (channel[n].xfade) {
-            float delta = 1.0f / (XFADE_SAMPLES);
-            while (x < XFADE_SAMPLES * 2 && x < len / 2) {
+            float delta = 1.0f / (XFADE_SAMPLES * 2);
+            while (x < XFADE_SAMPLES * 2) {
                 float alpha = x * delta;
                 float beta = 1.0f - alpha;
-                Sint16 next_a = next_a = next_sample(&channel[n].next_sample);
+                Sint16 next_a = next_sample(&channel[n].next_sample);
                 Sint16 next_b = 0;
                 if (channel[n].sample.data != 0) {
                     next_b = next_sample(&channel[n].sample);
@@ -2637,7 +2634,6 @@ audio_handler(void *ctx, Uint8 *out_stream, int len) {
             channel[n].xfade = false;
         }
         Sample *sample = &channel[n].sample;
-        int direction = 1;
         while (x < len / 2) {
             if (sample->data == 0) {
                 break;