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-rw-r--r--source/nds/entry.cpp131
1 files changed, 83 insertions, 48 deletions
diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index 7e6a2e5..cebb12e 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -35,7 +35,6 @@ static u8 Buf[MAX_BUFFER_SIZE];
#define FIXED_POINT_REMAINDER 0xffff
static volatile bool8 block_signal = FALSE;
-static volatile bool8 block_generate_sound = FALSE;
static volatile bool8 pending_signal = FALSE;
static void Init_Timer (void);
@@ -909,88 +908,82 @@ static volatile bool8 InInterrupt = FALSE;
void S9xGenerateSound ()
{
- block_signal = TRUE;
+ block_signal = TRUE;
#ifndef FOREVER_16_BIT_SOUND
- int bytes_so_far = so.sixteen_bit ? (so.samples_mixed_so_far << 1) :
- so.samples_mixed_so_far;
+ int bytes_so_far = so.sixteen_bit ? (so.samples_mixed_so_far << 1) :
+ so.samples_mixed_so_far;
#else
- int bytes_so_far = so.samples_mixed_so_far << 1;
+ int bytes_so_far = so.samples_mixed_so_far << 1;
#endif
if (bytes_so_far >= so.buffer_size)
goto end;
- so.err_counter += so.err_rate;
- if (so.err_counter >= FIXED_POINT)
- {
- int sample_count = so.err_counter >> FIXED_POINT_SHIFT;
- int byte_offset;
- int byte_count;
-
- so.err_counter &= FIXED_POINT_REMAINDER;
+ so.err_counter += so.err_rate;
+ if (so.err_counter >= FIXED_POINT)
+ {
+ // Write this many samples overall
+ int samples_to_write = so.err_counter >> FIXED_POINT_SHIFT;
#ifndef FOREVER_STEREO
if (so.stereo)
#endif
- sample_count <<= 1;
- byte_offset = bytes_so_far + so.play_position;
+ samples_to_write <<= 1;
+ int byte_offset = bytes_so_far + so.play_position;
+
+ so.err_counter &= FIXED_POINT_REMAINDER;
do
{
- int sc = sample_count;
- byte_count = sample_count;
+ int bytes_this_run = samples_to_write;
#ifndef FOREVER_16_BIT_SOUND
if (so.sixteen_bit)
#endif
- byte_count <<= 1;
+ bytes_this_run <<= 1;
- if ((byte_offset & SOUND_BUFFER_SIZE_MASK) + byte_count > SOUND_BUFFER_SIZE)
+ if ((byte_offset & SOUND_BUFFER_SIZE_MASK) + bytes_this_run > SOUND_BUFFER_SIZE)
{
- sc = SOUND_BUFFER_SIZE - (byte_offset & SOUND_BUFFER_SIZE_MASK);
- byte_count = sc;
-#ifndef FOREVER_16_BIT_SOUND
- if (so.sixteen_bit)
-#endif
- sc >>= 1;
+ bytes_this_run = SOUND_BUFFER_SIZE - (byte_offset & SOUND_BUFFER_SIZE_MASK);
}
- if (bytes_so_far + byte_count > so.buffer_size)
+ if (bytes_so_far + bytes_this_run > so.buffer_size)
{
- byte_count = so.buffer_size - bytes_so_far;
- if (byte_count == 0)
+ bytes_this_run = so.buffer_size - bytes_so_far;
+ if (bytes_this_run == 0)
break;
- sc = byte_count;
+ }
+
+ int samples_this_run = bytes_this_run;
#ifndef FOREVER_16_BIT_SOUND
- if (so.sixteen_bit)
+ if (so.sixteen_bit)
#endif
- sc >>= 1;
- }
+ samples_this_run >>= 1;
- S9xMixSamplesO (Buf, sc, byte_offset & SOUND_BUFFER_SIZE_MASK);
- so.samples_mixed_so_far += sc;
- sample_count -= sc;
+ S9xMixSamplesO (Buf, samples_this_run, byte_offset & SOUND_BUFFER_SIZE_MASK);
+ so.samples_mixed_so_far += samples_this_run;
+ samples_to_write -= samples_this_run;
#ifndef FOREVER_16_BIT_SOUND
- bytes_so_far = so.sixteen_bit ? (so.samples_mixed_so_far << 1) :
- so.samples_mixed_so_far;
+ bytes_so_far += so.sixteen_bit ? (samples_this_run << 1) :
+ samples_this_run;
#else
- bytes_so_far = so.samples_mixed_so_far << 1;
+ bytes_so_far += samples_this_run << 1;
#endif
- byte_offset += byte_count;
- } while (sample_count > 0);
- }
+ byte_offset = (byte_offset + bytes_this_run) & SOUND_BUFFER_SIZE_MASK;
+ } while (samples_to_write > 0);
+ }
IsSoundGenerated = TRUE;
end:
- if (pending_signal)
- {
+ if (pending_signal)
+ {
block_signal = FALSE;
pending_signal = FALSE;
// S9xProcessSound (0);
NDSSFCProduceSound (0);
- }
- else
+ }
+ else
block_signal = FALSE;
}
@@ -1063,10 +1056,52 @@ void NDSSFCProduceSound (unsigned int unused)
else
{
/* Mix the missing samples */
- S9xMixSamplesO (Buf, sample_count - so.samples_mixed_so_far,
- byte_offset & SOUND_BUFFER_SIZE_MASK);
+#ifndef FOREVER_16_BIT_SOUND
+ int bytes_so_far = so.sixteen_bit ? (so.samples_mixed_so_far << 1) :
+ so.samples_mixed_so_far;
+#else
+ int bytes_so_far = so.samples_mixed_so_far << 1;
+#endif
+
+ uint32 samples_to_write = sample_count - so.samples_mixed_so_far;
+ do
+ {
+ int bytes_this_run = samples_to_write;
+#ifndef FOREVER_16_BIT_SOUND
+ if (so.sixteen_bit)
+#endif
+ bytes_this_run <<= 1;
+
+ if ((byte_offset & SOUND_BUFFER_SIZE_MASK) + bytes_this_run > SOUND_BUFFER_SIZE)
+ {
+ bytes_this_run = SOUND_BUFFER_SIZE - (byte_offset & SOUND_BUFFER_SIZE_MASK);
+ }
+
+ if (bytes_so_far + bytes_this_run > so.buffer_size)
+ {
+ bytes_this_run = so.buffer_size - bytes_so_far;
+ if (bytes_this_run == 0)
+ break;
+ }
+
+ int samples_this_run = bytes_this_run;
+#ifndef FOREVER_16_BIT_SOUND
+ if (so.sixteen_bit)
+#endif
+ samples_this_run >>= 1;
+
+ S9xMixSamplesO (Buf, samples_this_run, byte_offset & SOUND_BUFFER_SIZE_MASK);
+ so.samples_mixed_so_far += samples_this_run;
+ samples_to_write -= samples_this_run;
+#ifndef FOREVER_16_BIT_SOUND
+ bytes_so_far += so.sixteen_bit ? (samples_this_run << 1) :
+ samples_this_run;
+#else
+ bytes_so_far += samples_this_run << 1;
+#endif
+ byte_offset = (byte_offset + bytes_this_run) & SOUND_BUFFER_SIZE_MASK;
+ } while (samples_to_write > 0);
}
- so.samples_mixed_so_far = sample_count;
}
// if (!so.mute_sound)