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Simplify render_audio

This commit is contained in:
twinaphex 2014-12-09 17:52:17 +01:00
parent 92812a1213
commit 5fc2752771
1 changed files with 13 additions and 31 deletions
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44
sound.c
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@ -517,33 +517,6 @@ void update_gbc_sound(u32 cpu_ticks)
(gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE; (gbc_sound_buffer_index + (buffer_ticks * 2)) % BUFFER_SIZE;
} }
#define sound_copy_normal() \
current_sample = source[i] \
#define sound_copy(source_offset, length, render_type) \
_length = (length) / 2; \
source = (s16 *)(sound_buffer + source_offset); \
for(i = 0; i < _length; i++) \
{ \
sound_copy_##render_type(); \
if(current_sample > 2047) \
current_sample = 2047; \
if(current_sample < -2048) \
current_sample = -2048; \
\
stream_base[i] = current_sample << 4; \
source[i] = 0; \
} \
#define sound_copy_null(source_offset, length) \
_length = (length) / 2; \
source = (s16 *)(sound_buffer + source_offset); \
for(i = 0; i < _length; i++) \
{ \
stream_base[i] = 0; \
source[i] = 0; \
} \
// Special thanks to blarrg for the LSFR frequency used in Meridian, as posted // Special thanks to blarrg for the LSFR frequency used in Meridian, as posted
// on the forum at http://meridian.overclocked.org: // on the forum at http://meridian.overclocked.org:
// http://meridian.overclocked.org/cgi-bin/wwwthreads/showpost.pl?Board=merid // http://meridian.overclocked.org/cgi-bin/wwwthreads/showpost.pl?Board=merid
@ -664,13 +637,22 @@ void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_batch_c
void render_audio(void) void render_audio(void)
{ {
static s16 stream_base[512]; static s16 stream_base[512];
u32 _length;
s16 *source; s16 *source;
u32 i; u32 i;
s32 current_sample;
while (((gbc_sound_buffer_index - sound_buffer_base) & BUFFER_SIZE_MASK) > 512) { while (((gbc_sound_buffer_index - sound_buffer_base) & BUFFER_SIZE_MASK) > 512)
sound_copy(sound_buffer_base, 1024, normal); {
source = (s16 *)(sound_buffer + sound_buffer_base);
for(i = 0; i < 512; i++)
{
s32 current_sample = source[i];
if(current_sample > 2047)
current_sample = 2047;
if(current_sample < -2048)
current_sample = -2048;
stream_base[i] = current_sample << 4;
source[i] = 0;
}
audio_batch_cb(stream_base, 256); audio_batch_cb(stream_base, 256);
sound_buffer_base += 512; sound_buffer_base += 512;
sound_buffer_base &= BUFFER_SIZE_MASK; sound_buffer_base &= BUFFER_SIZE_MASK;