The-Homebrew-Cloud/Genesis-Plus-GX
2
0
Fork 0
mirror of https://github.com/ekeeke/Genesis-Plus-GX.git synced 2024-11-09 04:15:14 +01:00
Code Issues Packages Projects Releases Wiki Activity

code cleanup

Browse Source
This commit is contained in:
ekeeke31 2010-01-13 22:08:35 +00:00
parent 7a4c208a34
commit ac4de61944
5 changed files with 70 additions and 55 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
source/sound/Fir_Resampler.c
View File

@ -25,6 +25,7 @@ static double ratio = 1.0;
static void gen_sinc(double rolloff, int width, double offset, double spacing, double scale, int count, short *out )
{
double w, rolloff_cos_a, num, den, sinc;
double const maxh = 256;
double const fstep = M_PI / maxh * spacing;
double const to_w = maxh * 2 / width;
@ -32,18 +33,19 @@ static void gen_sinc(double rolloff, int width, double offset, double spacing, d
scale /= maxh * 2;
double angle = (count / 2 - 1 + offset) * -fstep;
while ( count-- )
{
*out++ = 0;
double w = angle * to_w;
w = angle * to_w;
if ( fabs( w ) < M_PI )
{
double rolloff_cos_a = rolloff * cos( angle );
double num = 1 - rolloff_cos_a -
rolloff_cos_a = rolloff * cos( angle );
num = 1 - rolloff_cos_a -
pow_a_n * cos( maxh * angle ) +
pow_a_n * rolloff * cos( (maxh - 1) * angle );
double den = 1 - rolloff_cos_a - rolloff_cos_a + rolloff * rolloff;
double sinc = scale * num / den - scale;
den = 1 - rolloff_cos_a - rolloff_cos_a + rolloff * rolloff;
sinc = scale * num / den - scale;
out [-1] = (short) (cos( w ) * sinc + sinc);
}
@ -51,7 +53,7 @@ static void gen_sinc(double rolloff, int width, double offset, double spacing, d
}
}
static int available( unsigned long input_count )
static int available( long input_count )
{
int cycle_count = input_count / input_per_cycle;
int output_count = cycle_count * res * STEREO;
@ -75,14 +77,15 @@ static int available( unsigned long input_count )
int Fir_Resampler_initialize( int new_size )
{
buffer = (sample_t *) realloc( buffer, (new_size + WRITE_OFFSET) * sizeof (sample_t) );
write_pos = 0;
if ( !buffer && new_size ) return 0;
buffer_size = new_size + WRITE_OFFSET;
res = 1;
skip_bits = 0;
imp_phase = 0;
step = STEREO;
ratio = 1.0;
buffer = (sample_t *) realloc( buffer, (new_size + WRITE_OFFSET) * sizeof (sample_t) );
write_pos = 0;
if ( !buffer ) return 0;
buffer_size = new_size + WRITE_OFFSET;
Fir_Resampler_clear();
return 1;
}
@ -101,7 +104,7 @@ void Fir_Resampler_clear()
if ( buffer_size )
{
write_pos = &buffer [WRITE_OFFSET];
memset( buffer, 0, buffer_size * sizeof (sample_t) );
memset( buffer, 0, WRITE_OFFSET * sizeof (sample_t) );
}
}
@ -110,6 +113,7 @@ double Fir_Resampler_time_ratio( double new_factor )
ratio = new_factor;
int i, r;
double nearest, error;
double fstep = 0.0;
double least_error = 2;
double pos = 0.0;
@ -118,8 +122,8 @@ double Fir_Resampler_time_ratio( double new_factor )
for ( r = 1; r <= MAX_RES; r++ )
{
pos += ratio;
double nearest = floor( pos + 0.5 );
double error = fabs( pos - nearest );
nearest = floor( pos + 0.5 );
error = fabs( pos - nearest );
if ( error < least_error )
{
res = r;
@ -138,6 +142,7 @@ double Fir_Resampler_time_ratio( double new_factor )
double filter = (ratio < 1.0) ? 1.0 : 1.0 / ratio;
pos = 0.0;
input_per_cycle = 0;
for ( i = 0; i < res; i++ )
{
gen_sinc( ROLLOFF, (int) (WIDTH * filter + 1) & ~1, pos, filter,
@ -195,7 +200,7 @@ void Fir_Resampler_write( long count )
assert( write_pos <= ( buffer + buffer_size ) );
}
int Fir_Resampler_read( sample_t** out, unsigned long count )
int Fir_Resampler_read( sample_t** out, long count )
{
sample_t* out_l = out[0];
sample_t* out_r = out[1];
@ -207,13 +212,18 @@ int Fir_Resampler_read( sample_t** out, unsigned long count )
int n;
int pt0,pt1;
sample_t* i;
unsigned long l,r;
long l,r;
if ( end_pos - in >= WIDTH * STEREO )
{
end_pos -= WIDTH * STEREO;
do
{
count--;
if ( count < 0 )
break;
/* accumulate in extended precision */
l = 0;
r = 0;
@ -251,7 +261,7 @@ int Fir_Resampler_read( sample_t** out, unsigned long count )
*out_l++ = (sample_t) l;
*out_r++ = (sample_t) r;
}
while ( (in <= end_pos) && (--count > 0) );
while ( in <= end_pos );
}
imp_phase = res - remain;
@ -263,9 +273,9 @@ int Fir_Resampler_read( sample_t** out, unsigned long count )
return out_l - out[0];
}
int Fir_Resampler_input_needed( unsigned long output_count )
int Fir_Resampler_input_needed( long output_count )
{
unsigned long input_count = 0;
long input_count = 0;
unsigned long skip = skip_bits >> imp_phase;
int remain = res - imp_phase;

4
source/sound/Fir_Resampler.h
View File

@ -23,8 +23,8 @@ extern sample_t* Fir_Resampler_buffer( void );
extern int Fir_Resampler_written( void );
extern int Fir_Resampler_avail( void );
extern void Fir_Resampler_write( long count );
extern int Fir_Resampler_read( sample_t** out, unsigned long count );
extern int Fir_Resampler_input_needed( unsigned long output_count );
extern int Fir_Resampler_read( sample_t** out, long count );
extern int Fir_Resampler_input_needed( long output_count );
extern int Fir_Resampler_skip_input( long count );
#endif

9
source/system.c
View File

@ -150,14 +150,17 @@ int audio_init (int rate, double fps)
if (!rate || ((rate < 8000) | (rate > 48000))) return (-1);
snd.sample_rate = rate;
/* Calculate the sound buffer size (for one frame) */
snd.buffer_size = (rate / vdp_rate) + 8;
#ifndef NGC
/* Calculate the sound buffer size (for one frame) */
snd.buffer_size = (rate / vdp_rate);
/* Output buffers */
snd.buffer[0] = (int16 *) malloc(SND_SIZE);
snd.buffer[1] = (int16 *) malloc(SND_SIZE);
if (!snd.buffer[0] || !snd.buffer[1]) return (-1);
#else
/* Calculate the sound buffer size (for one frame) */
snd.buffer_size = (rate / vdp_rate) + 32;
#endif
/* SN76489 stream buffers */

24
source/vdp.c
View File

@ -218,8 +218,6 @@ void vdp_reset(void)
/* reset display area */
bitmap.viewport.w = 256;
bitmap.viewport.h = 224;
bitmap.viewport.oh = 256;
bitmap.viewport.ow = 224;
/* reset border area */
bitmap.viewport.x = config.overscan ? ((reg[12] & 1) ? 16 : 12) : 0;
@ -293,7 +291,7 @@ void vdp_update_dma()
int index = (4 * dma_type) + ((reg[12] & 1)*2);
if ((status&8) || !(reg[1] & 0x40)) index++;
/* DMA transfer rate */
/* DMA transfer rate (bytes per line) */
int rate = dma_rates[index];
/* 68k cycles left */
@ -412,7 +410,8 @@ void vdp_ctrl_w(unsigned int data)
seems to work fine (see Chaos Engine/Soldier of Fortune)
*/
fifo_latency = (reg[12] & 1) ? 27 : 30;
if ((code & 0x0F) == 0x01) fifo_latency = fifo_latency * 2;
if ((code & 0x0F) == 0x01)
fifo_latency = fifo_latency * 2;
}
/*
@ -444,17 +443,17 @@ unsigned int vdp_ctrl_r(void)
/* update DMA Busy flag */
if ((status & 2) && !dma_length && (count_m68k >= dma_endCycles))
{
status &= 0xFFFD;
}
unsigned int temp = status;
/* display OFF: VBLANK flag is set */
if (!(reg[1] & 0x40)) temp |= 0x8;
if (!(reg[1] & 0x40))
temp |= 0x08;
/* HBLANK flag (Sonic 3 and Sonic 2 "VS Modes", Lemmings 2, Mega Turrican) */
if ((count_m68k % m68cycles_per_line) < 84) temp |= 0x4;
if ((count_m68k % m68cycles_per_line) < 84)
temp |= 0x04;
/* clear pending flag */
pending = 0;
@ -522,7 +521,8 @@ void vdp_data_w(unsigned int data)
status |= 0x100;
/* VDP latency (Chaos Engine, Soldiers of Fortune, Double Clutch) */
if (fifo_write_cnt > 4) count_m68k = fifo_lastwrite + fifo_latency;
if (fifo_write_cnt > 4)
count_m68k = fifo_lastwrite + fifo_latency;
}
}
@ -598,8 +598,10 @@ int vdp_int_ack_callback(int int_level)
/* update IRQ status */
irq_status = 0x10;
if (vint_pending && (reg[1] & 0x20)) irq_status |= 6;
else if (hint_pending && (reg[0] & 0x10)) irq_status |= 4;
if (vint_pending && (reg[1] & 0x20))
irq_status |= 6;
else if (hint_pending && (reg[0] & 0x10))
irq_status |= 4;
return M68K_INT_ACK_AUTOVECTOR;
}