Don't use the "nos" driver1.1

This fixes:

- crash when exiting after running the game with the no sound (nos)
  driver
- occasional "pauses" when running the game with no sound

3 files changed, 29 insertions, 14 deletions

diff --git a/src/main.c b/src/main.c
index bc95e20..9e1a678 100644
--- a/src/main.c
+++ b/src/main.c
@@ -14,7 +14,7 @@
 #include "game.h"
 
 #define GAME_NAME "Gold Mine Run!"
-#define GAME_VERSION "1.0 (2023-08-08)"
+#define GAME_VERSION "1.1 (2023-08-10)"
 #define GAME_URL "https://www.usebox.net/jjm/gold-mine-run/"
 
 /* disable paging because our int handlers are written in C */
@@ -66,7 +66,7 @@ int main(int argc, char *argv[])
             }
     }
 
-    if (!sound_init(nosound))
+    if (!nosound && !sound_init())
     {
         fprintf(stderr, "ERROR: failed to init sound\n");
         return 1;
@@ -80,7 +80,8 @@ int main(int argc, char *argv[])
     control_init();
 
     /* to update mikmod */
-    timer_user_fn(sound_update);
+    if (!nosound)
+        timer_user_fn(sound_update);
 
     /* set VGA 320x200, 256 col */
     if (!set_mode(0x13))
diff --git a/src/sound.c b/src/sound.c
index a3f38b8..bf0c7be 100644
--- a/src/sound.c
+++ b/src/sound.c
@@ -26,18 +26,16 @@ static Efx efx[EFX_CNT] =
     { NULL, (const char *)binary_death_efx_start, (size_t)&binary_death_efx_size},
 };
 
+static uint8_t has_sound = 0;
 static uint8_t cur = 0;
 static uint32_t voice = 0;
-
 static MODULE *music = NULL;
 
-uint8_t sound_init(uint8_t nosound)
+uint8_t sound_init()
 {
     MikMod_InitThreads();
 
-    if (!nosound)
-        MikMod_RegisterDriver(&drv_sb);
-    MikMod_RegisterDriver(&drv_nos);
+    MikMod_RegisterDriver(&drv_sb);
     MikMod_RegisterLoader(&load_it);
 
     md_mode |= DMODE_SOFT_SNDFX | DMODE_SOFT_MUSIC;
@@ -47,7 +45,8 @@ uint8_t sound_init(uint8_t nosound)
     md_mixfreq = 22050;
 
     if (MikMod_Init(NULL))
-        return 0;
+        /* has_sound is 0 */
+        return 1;
 
     for (uint8_t i = 0; i < EFX_CNT; i++)
     {
@@ -67,6 +66,7 @@ uint8_t sound_init(uint8_t nosound)
     Player_Start(music);
     MikMod_EnableOutput();
 
+    has_sound = 1;
     return 1;
 }
 
@@ -76,6 +76,10 @@ volatile static uint8_t divider = 0;
  * counter and updating 1 in 20 interrupts */
 void sound_update()
 {
+    /* we shouldn't call this anyway */
+    if (!has_sound)
+        return;
+
     if (++divider == 20)
     {
         divider = 0;
@@ -85,17 +89,23 @@ void sound_update()
 
 void sound_mute()
 {
-    MikMod_DisableOutput();
+    if (has_sound)
+        MikMod_DisableOutput();
 }
 
 void sound_unmute()
 {
-    MikMod_EnableOutput();
+    if (has_sound)
+        MikMod_EnableOutput();
 }
 
 void sound_free()
 {
-    MikMod_DisableOutput();
+    if (!has_sound)
+        return;
+
+    if (MikMod_Active())
+        MikMod_DisableOutput();
 
     if (music)
         Player_Free(music);
@@ -109,11 +119,15 @@ void sound_free()
 
 void sound_music_pattern(uint16_t pat)
 {
-    Player_SetPosition(pat);
+    if (has_sound)
+        Player_SetPosition(pat);
 }
 
 void sound_play_efx(uint8_t efxno)
 {
+    if (!has_sound)
+        return;
+
     if (cur > efxno && !Voice_Stopped(voice))
         return;
 
diff --git a/src/sound.h b/src/sound.h
index 2446b68..4e1085d 100644
--- a/src/sound.h
+++ b/src/sound.h
@@ -19,7 +19,7 @@ enum {
 #define PAT_GAMEOVER    4
 #define PAT_PLAY        5
 
-uint8_t sound_init(uint8_t nosound);
+uint8_t sound_init();
 void sound_free();
 void sound_update();