mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-11-04 18:05:06 +01:00
code cleanup
This commit is contained in:
ekeeke31
parent
7a4c208a34
commit
ac4de61944
@ -25,6 +25,7 @@ static double ratio = 1.0;
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static void gen_sinc(double rolloff, int width, double offset, double spacing, double scale, int count, short *out )
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{
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double w, rolloff_cos_a, num, den, sinc;
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double const maxh = 256;
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double const fstep = M_PI / maxh * spacing;
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double const to_w = maxh * 2 / width;
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@ -32,18 +33,19 @@ static void gen_sinc(double rolloff, int width, double offset, double spacing, d
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scale /= maxh * 2;
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double angle = (count / 2 - 1 + offset) * -fstep;
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while ( count-- )
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{
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*out++ = 0;
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double w = angle * to_w;
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w = angle * to_w;
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if ( fabs( w ) < M_PI )
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{
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double rolloff_cos_a = rolloff * cos( angle );
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double num = 1 - rolloff_cos_a -
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rolloff_cos_a = rolloff * cos( angle );
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num = 1 - rolloff_cos_a -
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pow_a_n * cos( maxh * angle ) +
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pow_a_n * rolloff * cos( (maxh - 1) * angle );
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double den = 1 - rolloff_cos_a - rolloff_cos_a + rolloff * rolloff;
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double sinc = scale * num / den - scale;
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den = 1 - rolloff_cos_a - rolloff_cos_a + rolloff * rolloff;
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sinc = scale * num / den - scale;
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out [-1] = (short) (cos( w ) * sinc + sinc);
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}
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@ -51,7 +53,7 @@ static void gen_sinc(double rolloff, int width, double offset, double spacing, d
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}
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}
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static int available( unsigned long input_count )
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static int available( long input_count )
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{
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int cycle_count = input_count / input_per_cycle;
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int output_count = cycle_count * res * STEREO;
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@ -75,14 +77,15 @@ static int available( unsigned long input_count )
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int Fir_Resampler_initialize( int new_size )
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{
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buffer = (sample_t *) realloc( buffer, (new_size + WRITE_OFFSET) * sizeof (sample_t) );
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write_pos = 0;
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if ( !buffer && new_size ) return 0;
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buffer_size = new_size + WRITE_OFFSET;
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res = 1;
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skip_bits = 0;
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imp_phase = 0;
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step = STEREO;
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ratio = 1.0;
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buffer = (sample_t *) realloc( buffer, (new_size + WRITE_OFFSET) * sizeof (sample_t) );
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write_pos = 0;
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if ( !buffer ) return 0;
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buffer_size = new_size + WRITE_OFFSET;
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Fir_Resampler_clear();
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return 1;
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}
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@ -101,7 +104,7 @@ void Fir_Resampler_clear()
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if ( buffer_size )
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{
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write_pos = &buffer [WRITE_OFFSET];
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memset( buffer, 0, buffer_size * sizeof (sample_t) );
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memset( buffer, 0, WRITE_OFFSET * sizeof (sample_t) );
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}
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}
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@ -110,6 +113,7 @@ double Fir_Resampler_time_ratio( double new_factor )
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ratio = new_factor;
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int i, r;
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double nearest, error;
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double fstep = 0.0;
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double least_error = 2;
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double pos = 0.0;
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@ -118,8 +122,8 @@ double Fir_Resampler_time_ratio( double new_factor )
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for ( r = 1; r <= MAX_RES; r++ )
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{
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pos += ratio;
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double nearest = floor( pos + 0.5 );
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double error = fabs( pos - nearest );
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nearest = floor( pos + 0.5 );
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error = fabs( pos - nearest );
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if ( error < least_error )
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{
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res = r;
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@ -138,6 +142,7 @@ double Fir_Resampler_time_ratio( double new_factor )
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double filter = (ratio < 1.0) ? 1.0 : 1.0 / ratio;
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pos = 0.0;
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input_per_cycle = 0;
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for ( i = 0; i < res; i++ )
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{
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gen_sinc( ROLLOFF, (int) (WIDTH * filter + 1) & ~1, pos, filter,
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@ -195,7 +200,7 @@ void Fir_Resampler_write( long count )
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assert( write_pos <= ( buffer + buffer_size ) );
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}
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int Fir_Resampler_read( sample_t** out, unsigned long count )
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int Fir_Resampler_read( sample_t** out, long count )
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{
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sample_t* out_l = out[0];
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sample_t* out_r = out[1];
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@ -207,13 +212,18 @@ int Fir_Resampler_read( sample_t** out, unsigned long count )
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int n;
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int pt0,pt1;
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sample_t* i;
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unsigned long l,r;
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long l,r;
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if ( end_pos - in >= WIDTH * STEREO )
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{
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end_pos -= WIDTH * STEREO;
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do
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{
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count--;
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if ( count < 0 )
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break;
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/* accumulate in extended precision */
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l = 0;
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r = 0;
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@ -251,7 +261,7 @@ int Fir_Resampler_read( sample_t** out, unsigned long count )
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*out_l++ = (sample_t) l;
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*out_r++ = (sample_t) r;
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}
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while ( (in <= end_pos) && (--count > 0) );
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while ( in <= end_pos );
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}
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imp_phase = res - remain;
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@ -263,9 +273,9 @@ int Fir_Resampler_read( sample_t** out, unsigned long count )
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return out_l - out[0];
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}
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int Fir_Resampler_input_needed( unsigned long output_count )
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int Fir_Resampler_input_needed( long output_count )
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{
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unsigned long input_count = 0;
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long input_count = 0;
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unsigned long skip = skip_bits >> imp_phase;
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int remain = res - imp_phase;
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@ -23,8 +23,8 @@ extern sample_t* Fir_Resampler_buffer( void );
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extern int Fir_Resampler_written( void );
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extern int Fir_Resampler_avail( void );
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extern void Fir_Resampler_write( long count );
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extern int Fir_Resampler_read( sample_t** out, unsigned long count );
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extern int Fir_Resampler_input_needed( unsigned long output_count );
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extern int Fir_Resampler_read( sample_t** out, long count );
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extern int Fir_Resampler_input_needed( long output_count );
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extern int Fir_Resampler_skip_input( long count );
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#endif
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@ -590,9 +590,9 @@ typedef struct
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/* OPN/A/B common state */
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typedef struct
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{
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FM_ST ST; /* general state */
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FM_3SLOT SL3; /* 3 slot mode state */
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unsigned int pan[6*2]; /* fm channels output masks (0xffffffff = enable) */
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FM_ST ST; /* general state */
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FM_3SLOT SL3; /* 3 slot mode state */
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unsigned int pan[6*2]; /* fm channels output masks (0xffffffff = enable) */
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UINT32 eg_cnt; /* global envelope generator counter */
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UINT32 eg_timer; /* global envelope generator counter works at frequency = chipclock/144/3 */
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@ -601,15 +601,15 @@ typedef struct
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/* there are 2048 FNUMs that can be generated using FNUM/BLK registers
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but LFO works with one more bit of a precision so we really need 4096 elements */
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UINT32 fn_table[4096]; /* fnumber->increment counter */
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UINT32 fn_max; /* max increment (required for calculating phase overflow) */
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UINT32 fn_table[4096]; /* fnumber->increment counter */
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UINT32 fn_max; /* max increment (required for calculating phase overflow) */
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/* LFO */
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UINT8 lfo_cnt; /* current LFO phase (out of 128) */
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UINT32 lfo_timer; /* current LFO phase runs at LFO frequency */
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UINT32 lfo_timer_add; /* step of lfo_timer */
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UINT32 lfo_timer_overflow; /* LFO timer overflows every N samples (depends on LFO frequency) */
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UINT32 LFO_AM; /* current LFO AM step */
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UINT32 LFO_AM; /* current LFO AM step */
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UINT32 LFO_PM; /* current LFO PM step */
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} FM_OPN;
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@ -1032,7 +1032,7 @@ INLINE void advance_lfo()
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if (ym2612.OPN.lfo_timer_overflow) /* LFO enabled ? */
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{
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/* increment LFO timer */
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ym2612.OPN.lfo_timer += ym2612.OPN.lfo_timer_add;
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ym2612.OPN.lfo_timer += ym2612.OPN.lfo_timer_add;
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/* when LFO is enabled, one level will last for 108, 77, 71, 67, 62, 44, 8 or 5 samples */
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while (ym2612.OPN.lfo_timer >= ym2612.OPN.lfo_timer_overflow)
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@ -1590,7 +1590,7 @@ INLINE void OPNWriteReg(int r, int v)
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SLOT->vol_out = ((UINT32)(0x200 - SLOT->volume) & MAX_ATT_INDEX) + SLOT->tl;
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else
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SLOT->vol_out = (UINT32)SLOT->volume + SLOT->tl;
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}
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}
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/* SSG-EG envelope shapes :
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@ -1828,13 +1828,13 @@ static void init_tables(void)
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/* we never reach (1<<16) here due to the (x+1) */
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/* result fits within 16 bits at maximum */
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n = (int)m; /* 16 bits here */
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n = (int)m; /* 16 bits here */
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n >>= 4; /* 12 bits here */
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if (n&1) /* round to nearest */
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n = (n>>1)+1;
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else
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n = n>>1;
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/* 11 bits here (rounded) */
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/* 11 bits here (rounded) */
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n <<= 2; /* 13 bits here (as in real chip) */
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/* 14 bits (with sign bit) */
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@ -1889,7 +1889,7 @@ static void init_tables(void)
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UINT32 offset_fnum_bit;
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UINT32 bit_tmp;
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for (step=0; step<8; step++)
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for (step=0; step<8; step++)
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{
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value = 0;
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for (bit_tmp=0; bit_tmp<7; bit_tmp++) /* 7 bits */
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@ -1908,7 +1908,7 @@ static void init_tables(void)
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}
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}
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}
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}
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}
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@ -1969,7 +1969,7 @@ int YM2612ResetChip(void)
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/* a = address */
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/* v = value */
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void YM2612Write(unsigned int a, unsigned int v)
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{
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{
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v &= 0xff; /* adjust to 8 bit bus */
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switch( a )
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@ -1980,7 +1980,7 @@ void YM2612Write(unsigned int a, unsigned int v)
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case 2: /* address port 1 */
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ym2612.OPN.ST.address = v | 0x100;
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break;
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break;
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default: /* data port */
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{
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@ -1992,24 +1992,24 @@ void YM2612Write(unsigned int a, unsigned int v)
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{
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case 0x2a: /* DAC data (ym2612) */
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ym2612.dacout = ((int)v - 0x80) << 6; /* level unknown (5 is too low, 8 is too loud) */
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break;
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break;
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case 0x2b: /* DAC Sel (ym2612) */
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/* b7 = dac enable */
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ym2612.dacen = v & 0x80;
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break;
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break;
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default: /* OPN section */
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/* write register */
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OPNWriteMode(addr,v);
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}
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break;
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}
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break;
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default: /* 0x30-0xff OPN section */
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/* write register */
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OPNWriteReg(addr,v);
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}
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break;
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}
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}
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break;
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}
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}
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}
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unsigned int YM2612Read(void)
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{
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@ -150,14 +150,17 @@ int audio_init (int rate, double fps)
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if (!rate || ((rate < 8000) | (rate > 48000))) return (-1);
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snd.sample_rate = rate;
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/* Calculate the sound buffer size (for one frame) */
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snd.buffer_size = (rate / vdp_rate) + 8;
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#ifndef NGC
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/* Calculate the sound buffer size (for one frame) */
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snd.buffer_size = (rate / vdp_rate);
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/* Output buffers */
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snd.buffer[0] = (int16 *) malloc(SND_SIZE);
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snd.buffer[1] = (int16 *) malloc(SND_SIZE);
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if (!snd.buffer[0] || !snd.buffer[1]) return (-1);
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#else
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/* Calculate the sound buffer size (for one frame) */
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snd.buffer_size = (rate / vdp_rate) + 32;
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#endif
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/* SN76489 stream buffers */
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24
source/vdp.c
24
source/vdp.c
@ -218,8 +218,6 @@ void vdp_reset(void)
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/* reset display area */
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bitmap.viewport.w = 256;
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bitmap.viewport.h = 224;
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bitmap.viewport.oh = 256;
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bitmap.viewport.ow = 224;
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/* reset border area */
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bitmap.viewport.x = config.overscan ? ((reg[12] & 1) ? 16 : 12) : 0;
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@ -293,7 +291,7 @@ void vdp_update_dma()
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int index = (4 * dma_type) + ((reg[12] & 1)*2);
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if ((status&8) || !(reg[1] & 0x40)) index++;
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/* DMA transfer rate */
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/* DMA transfer rate (bytes per line) */
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int rate = dma_rates[index];
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/* 68k cycles left */
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@ -412,7 +410,8 @@ void vdp_ctrl_w(unsigned int data)
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seems to work fine (see Chaos Engine/Soldier of Fortune)
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*/
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fifo_latency = (reg[12] & 1) ? 27 : 30;
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if ((code & 0x0F) == 0x01) fifo_latency = fifo_latency * 2;
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if ((code & 0x0F) == 0x01)
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fifo_latency = fifo_latency * 2;
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}
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/*
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@ -444,17 +443,17 @@ unsigned int vdp_ctrl_r(void)
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/* update DMA Busy flag */
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if ((status & 2) && !dma_length && (count_m68k >= dma_endCycles))
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{
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status &= 0xFFFD;
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}
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unsigned int temp = status;
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/* display OFF: VBLANK flag is set */
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if (!(reg[1] & 0x40)) temp |= 0x8;
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if (!(reg[1] & 0x40))
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temp |= 0x08;
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/* HBLANK flag (Sonic 3 and Sonic 2 "VS Modes", Lemmings 2, Mega Turrican) */
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if ((count_m68k % m68cycles_per_line) < 84) temp |= 0x4;
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if ((count_m68k % m68cycles_per_line) < 84)
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temp |= 0x04;
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/* clear pending flag */
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pending = 0;
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@ -522,7 +521,8 @@ void vdp_data_w(unsigned int data)
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status |= 0x100;
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/* VDP latency (Chaos Engine, Soldiers of Fortune, Double Clutch) */
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if (fifo_write_cnt > 4) count_m68k = fifo_lastwrite + fifo_latency;
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if (fifo_write_cnt > 4)
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count_m68k = fifo_lastwrite + fifo_latency;
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}
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}
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@ -598,8 +598,10 @@ int vdp_int_ack_callback(int int_level)
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/* update IRQ status */
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irq_status = 0x10;
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if (vint_pending && (reg[1] & 0x20)) irq_status |= 6;
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else if (hint_pending && (reg[0] & 0x10)) irq_status |= 4;
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if (vint_pending && (reg[1] & 0x20))
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irq_status |= 6;
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else if (hint_pending && (reg[0] & 0x10))
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irq_status |= 4;
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return M68K_INT_ACK_AUTOVECTOR;
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}
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