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new sound engine

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This commit is contained in:
ekeeke31 2008-12-17 17:18:07 +00:00
parent ae04a19023
commit 831c9642d3
3 changed files with 38 additions and 33 deletions
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16
source/ngc/ngc.c
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@ -108,11 +108,12 @@ static void init_machine (void)
***************************************************/ ***************************************************/
void reloadrom () void reloadrom ()
{ {
load_rom(""); /* Load ROM */ load_rom(""); /* Load ROM */
system_init (); /* Initialize System */ system_init (); /* Initialize System */
audio_init(48000); /* Audio System initialization */ audio_init(48000); /* Audio System initialization */
ClearGGCodes (); /* Clear Game Genie patches */ ClearGGCodes (); /* Clear Game Genie patches */
system_reset (); /* System Power ON */ system_reset (); /* System Power ON */
ogc_audio__reset(); /* reset audio buffers */
} }
/*************************************************************************** /***************************************************************************
@ -232,6 +233,7 @@ int main (int argc, char *argv[])
/* Delay */ /* Delay */
while (!frameticker) usleep(10); while (!frameticker) usleep(10);
/* Render Frame */
system_frame (0); system_frame (0);
RenderedFrameCount++; RenderedFrameCount++;
} }
@ -255,8 +257,8 @@ int main (int argc, char *argv[])
/* Check for Menu request */ /* Check for Menu request */
if (ConfigRequested) if (ConfigRequested)
{ {
/* reset AUDIO */ /* stop AUDIO */
ogc_audio__reset(); ogc_audio__stop();
/* go to menu */ /* go to menu */
MainMenu (); MainMenu ();

54
source/ngc/ogc_audio.c
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@ -29,6 +29,7 @@ int mixbuffer = 0;
static int playbuffer = 0; static int playbuffer = 0;
static int IsPlaying = 0; static int IsPlaying = 0;
static u32 dma_len = 3200;
/*** AudioSwitchBuffers /*** AudioSwitchBuffers
Genesis Plus only provides sound data on completion of each frame. Genesis Plus only provides sound data on completion of each frame.
@ -38,32 +39,14 @@ static int IsPlaying = 0;
***/ ***/
static void AudioSwitchBuffers() static void AudioSwitchBuffers()
{ {
if (ConfigRequested)
{
IsPlaying = 0;
return;
}
u32 dma_len = (vdp_pal) ? 3840 : 3200;
/* restart audio DMA with current soundbuffer */
AUDIO_InitDMA((u32) soundbuffer[playbuffer], dma_len);
DCFlushRange(soundbuffer[playbuffer], dma_len);
AUDIO_StartDMA();
/* increment soundbuffers index */ /* increment soundbuffers index */
playbuffer++; playbuffer++;
playbuffer &= 0xf; playbuffer &= 0xf;
if (playbuffer == mixbuffer) /* reset audio DMA parameters */
{ AUDIO_InitDMA((u32) soundbuffer[playbuffer], dma_len);
playbuffer--;
if ( playbuffer < 0 ) playbuffer = 15;
}
IsPlaying = 1;
} }
void ogc_audio__init(void) void ogc_audio__init(void)
{ {
AUDIO_Init (NULL); AUDIO_Init (NULL);
@ -73,15 +56,34 @@ void ogc_audio__init(void)
void ogc_audio__reset(void) void ogc_audio__reset(void)
{ {
AUDIO_StopDMA ();
IsPlaying = 0;
mixbuffer = 0;
playbuffer = 0;
memset(soundbuffer, 0, 16 * 3840); memset(soundbuffer, 0, 16 * 3840);
} }
void ogc_audio__update(void) void ogc_audio__update(void)
{ {
/* restart Audio DMA if needed */ /* flush data from CPU cache */
if (!IsPlaying) AudioSwitchBuffers(); DCFlushRange(soundbuffer[mixbuffer], dma_len);
if (!IsPlaying)
{
dma_len = (vdp_pal) ? 3840 : 3200;
/* set audio DMA parameters */
AUDIO_InitDMA((u32) soundbuffer[0], dma_len);
/* start audio DMA */
AUDIO_StartDMA();
IsPlaying = 1;
}
} }
void ogc_audio__stop(void)
{
/* stop audio DMA */
AUDIO_StopDMA ();
IsPlaying = 0;
mixbuffer = 0;
playbuffer = 0;
}

1
source/ngc/ogc_audio.h
View File

@ -29,6 +29,7 @@ extern int mixbuffer;
extern void ogc_audio__init(void); extern void ogc_audio__init(void);
extern void ogc_audio__reset(void); extern void ogc_audio__reset(void);
extern void ogc_audio__stop(void);
extern void ogc_audio__update(void); extern void ogc_audio__update(void);
#endif #endif