From 0d048d05ee50625f15d5235d362df6ee71903fc5 Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Sun, 13 Jan 2013 05:00:47 -0500
Subject: Revert timer-interrupt audio, but not optimisations done since then.
 Get the controller status every scanline again.

---
 source/nds/entry.cpp | 49 ++++++-------------------------------------------
 source/nds/gui.c     |  3 ---
 2 files changed, 6 insertions(+), 46 deletions(-)

(limited to 'source/nds')

diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index f470a43..a389ebc 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -23,7 +23,6 @@
 #include "ds2sound.h"
 
 void S9xProcessSound (unsigned int);
-void NDSSFCProduceSound (unsigned int);
 
 char *rom_filename = NULL;
 char *SDD1_pack = NULL;
@@ -545,13 +544,6 @@ int sfc_main (int argc, char **argv)
                   TRUE,
 #endif
                   Settings.SoundBufferSize);
-	// Start a timer for the sound
-	initTimer(0 /* timer channel, 0 or 1 */,
-	          INTERRUPT_TIME /* period in microseconds */,
-	          NDSSFCProduceSound /* timer function, void (unsigned int) */,
-	          0 /* programmer-specified argument to ^ */);
-	runTimer(0 /* timer channel, 0 or 1 */);
-
 #ifdef GFX_MULTI_FORMAT
 //    S9xSetRenderPixelFormat (RGB565);
     S9xSetRenderPixelFormat (BGR555);
@@ -893,18 +885,6 @@ bool8 S9xOpenSoundDevice (int mode, bool8 stereo, int buffer_size)
     return (TRUE);
 }
 
-/*
- * In the interrupt model, calls to NDSSFCProduceSound could happen even
- * when the CPU or APU is being reset or reloaded from a file. Prevent
- * glitches and/or crashes (!) from occurring while sound is not being
- * generated.
- */
-static volatile bool8 IsSoundGenerated = FALSE;
-/*
- * Also prevent an interrupt from triggering on top of another one.
- */
-static volatile bool8 InInterrupt = FALSE;
-
 void S9xGenerateSound ()
 {
 	block_signal = TRUE;
@@ -971,16 +951,13 @@ void S9xGenerateSound ()
 		} while (samples_to_write > 0);
 	}
 
-	IsSoundGenerated = TRUE;
-
 end:
 
 	if (pending_signal)
 	{
 		block_signal = FALSE;
 		pending_signal = FALSE;
-		// S9xProcessSound (0);
-		NDSSFCProduceSound (0);
+		S9xProcessSound (0);
 	}
 	else
 		block_signal = FALSE;
@@ -988,28 +965,19 @@ end:
 
 void S9xProcessSound (unsigned int)
 {
-	// Nothing here! See the interrupt handling code below.
-}
-
-void NDSSFCProduceSound (unsigned int unused)
-{
-	if (InInterrupt)
-		return;
-
-	InInterrupt = TRUE;
 	if (block_signal)
 	{
 		pending_signal = TRUE;
-		goto end;
+		return;
 	}
 
 	unsigned short *audiobuff;
 
-	if (Settings.Paused || !IsSoundGenerated || so.mute_sound || !game_enable_audio)
-		goto end;
+	if (Settings.Paused || so.mute_sound || !game_enable_audio)
+		return;
 
 	if(ds2_checkAudiobuff() > 4)
-		goto end;
+		return;
 
 	/* Number of samples to generate now */
 	int sample_count;
@@ -1029,7 +997,7 @@ void NDSSFCProduceSound (unsigned int unused)
 	audiobuff = (unsigned short*)ds2_getAudiobuff();
 	if(NULL == audiobuff)	//There are audio queue in sending or wait to send
 	{
-		goto end;
+		return;
 	}
 
 	/* If we need more audio samples */
@@ -1144,12 +1112,7 @@ void NDSSFCProduceSound (unsigned int unused)
 		/* All data sent. */
 	}
 
-	IsSoundGenerated = FALSE;
-
 	so.samples_mixed_so_far -= sample_count;
-
-end:
-	InInterrupt = FALSE;
 }
 
 void Init_Timer (void)
diff --git a/source/nds/gui.c b/source/nds/gui.c
index 01f08e3..2af3ff7 100644
--- a/source/nds/gui.c
+++ b/source/nds/gui.c
@@ -1651,7 +1651,6 @@ unsigned int frame_interval;
 --------------------------------------------------------*/
 u32 menu(u16 *screen)
 {
-	stopTimer(0 /* timer interrupt channel for sound */);
     gui_action_type gui_action;
     u32 i;
     u32 repeat;
@@ -3850,8 +3849,6 @@ u32 menu(u16 *screen)
 
 	set_cpu_clock(clock_speed_number);
 
-	runTimer(0 /* timer interrupt channel for sound */);
-
 	return return_value;
 }
 
-- 
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