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unblip-ize the T6W28 code

This commit is contained in:
tildearrow 2022-10-09 12:46:21 -05:00
parent 9ea72a321f
commit 691a7eeea7
3 changed files with 39 additions and 27 deletions
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46
src/engine/platform/sound/t6w28/T6W28_Apu.cpp
View File

@ -1,6 +1,8 @@
// T6W28_Snd_Emu
#include "T6W28_Apu.h"
#include <stdlib.h>
#include <assert.h>
#undef require
#define require( expr ) assert( expr )
@ -21,6 +23,10 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
namespace MDFN_IEN_NGP
{
void fakeBufOffset(int time, int delta, Fake_Buffer* buf) {
buf->curValue+=delta;
}
T6W28_Osc::T6W28_Osc()
{
outputs [0] = NULL; // always stays NULL
@ -41,7 +47,7 @@ void T6W28_Osc::reset()
// T6W28_Square
blip_inline void T6W28_Square::reset()
void T6W28_Square::reset()
{
period = 0;
phase = 0;
@ -55,13 +61,13 @@ void T6W28_Square::run( sms_time_t time, sms_time_t end_time )
// ignore 16kHz and higher
if ( last_amp_left )
{
synth->offset( time, -last_amp_left, outputs[2] );
fakeBufOffset( time, -last_amp_left, outputs[2] );
last_amp_left = 0;
}
if ( last_amp_right )
{
synth->offset( time, -last_amp_right, outputs[1] );
fakeBufOffset( time, -last_amp_right, outputs[1] );
last_amp_right = 0;
}
@ -90,21 +96,21 @@ void T6W28_Square::run( sms_time_t time, sms_time_t end_time )
if ( delta_left )
{
last_amp_left = amp_left;
synth->offset( time, delta_left, outputs[2] );
fakeBufOffset( time, delta_left, outputs[2] );
}
if ( delta_right )
{
last_amp_right = amp_right;
synth->offset( time, delta_right, outputs[1] );
fakeBufOffset( time, delta_right, outputs[1] );
}
}
time += delay;
if ( time < end_time )
{
Blip_Buffer* const output_left = this->outputs[2];
Blip_Buffer* const output_right = this->outputs[1];
Fake_Buffer* const output_left = this->outputs[2];
Fake_Buffer* const output_right = this->outputs[1];
int delta_left = amp_left * 2;
int delta_right = amp_right * 2;
@ -113,8 +119,8 @@ void T6W28_Square::run( sms_time_t time, sms_time_t end_time )
delta_left = -delta_left;
delta_right = -delta_right;
synth->offset_inline( time, delta_left, output_left );
synth->offset_inline( time, delta_right, output_right );
fakeBufOffset( time, delta_left, output_left );
fakeBufOffset( time, delta_right, output_right );
time += period;
phase ^= 1;
}
@ -131,7 +137,7 @@ void T6W28_Square::run( sms_time_t time, sms_time_t end_time )
static const int noise_periods [3] = { 0x100, 0x200, 0x400 };
blip_inline void T6W28_Noise::reset()
void T6W28_Noise::reset()
{
period = &noise_periods [0];
shifter = 0x4000;
@ -158,13 +164,13 @@ void T6W28_Noise::run( sms_time_t time, sms_time_t end_time )
if ( delta_left )
{
last_amp_left = amp_left;
synth.offset( time, delta_left, outputs[2] );
fakeBufOffset( time, delta_left, outputs[2] );
}
if ( delta_right )
{
last_amp_right = amp_right;
synth.offset( time, delta_right, outputs[1] );
fakeBufOffset( time, delta_right, outputs[1] );
}
}
@ -175,8 +181,8 @@ void T6W28_Noise::run( sms_time_t time, sms_time_t end_time )
if ( time < end_time )
{
Blip_Buffer* const output_left = this->outputs[2];
Blip_Buffer* const output_right = this->outputs[1];
Fake_Buffer* const output_left = this->outputs[2];
Fake_Buffer* const output_right = this->outputs[1];
unsigned l_shifter = this->shifter;
int delta_left = amp_left * 2;
@ -193,10 +199,10 @@ void T6W28_Noise::run( sms_time_t time, sms_time_t end_time )
if ( changed )
{
delta_left = -delta_left;
synth.offset_inline( time, delta_left, output_left );
fakeBufOffset( time, delta_left, output_left );
delta_right = -delta_right;
synth.offset_inline( time, delta_right, output_right );
fakeBufOffset( time, delta_right, output_right );
}
time += l_period;
}
@ -215,12 +221,10 @@ T6W28_Apu::T6W28_Apu()
{
for ( int i = 0; i < 3; i++ )
{
squares [i].synth = &square_synth;
oscs [i] = &squares [i];
}
oscs [3] = &noise;
volume( 1.0 );
reset();
}
@ -229,9 +233,9 @@ T6W28_Apu::~T6W28_Apu()
}
void T6W28_Apu::osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right )
void T6W28_Apu::osc_output( int index, Fake_Buffer* center, Fake_Buffer* left, Fake_Buffer* right )
{
require( (unsigned) index < osc_count );
require( (unsigned int) index < osc_count );
require( (center && left && right) || (!center && !left && !right) );
T6W28_Osc& osc = *oscs [index];
osc.outputs [1] = right;
@ -239,7 +243,7 @@ void T6W28_Apu::osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, B
osc.outputs [3] = center;
}
void T6W28_Apu::output( Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right )
void T6W28_Apu::output( Fake_Buffer* center, Fake_Buffer* left, Fake_Buffer* right )
{
for ( int i = 0; i < osc_count; i++ )
osc_output( i, center, left, right );

19
src/engine/platform/sound/t6w28/T6W28_Apu.h
View File

@ -8,6 +8,13 @@ namespace MDFN_IEN_NGP
typedef long sms_time_t; // clock cycle count
struct Fake_Buffer {
int curValue;
Fake_Buffer():
curValue(0) {}
};
}
#include "T6W28_Oscs.h"
@ -38,15 +45,15 @@ public:
// Assign all oscillator outputs to specified buffer(s). If buffer
// is NULL, silences all oscillators.
void output( Blip_Buffer* mono );
void output( Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
void output( Fake_Buffer* mono );
void output( Fake_Buffer* center, Fake_Buffer* left, Fake_Buffer* right );
// Assign single oscillator output to buffer(s). Valid indicies are 0 to 3,
// which refer to Square 1, Square 2, Square 3, and Noise. If buffer is NULL,
// silences oscillator.
enum { osc_count = 4 };
void osc_output( int index, Blip_Buffer* mono );
void osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
void osc_output( int index, Fake_Buffer* mono );
void osc_output( int index, Fake_Buffer* center, Fake_Buffer* left, Fake_Buffer* right );
// Reset oscillators and internal state
void reset();
@ -79,9 +86,9 @@ private:
void run_until( sms_time_t );
};
inline void T6W28_Apu::output( Blip_Buffer* b ) { output( b, b, b ); }
inline void T6W28_Apu::output( Fake_Buffer* b ) { output( b, b, b ); }
inline void T6W28_Apu::osc_output( int i, Blip_Buffer* b ) { osc_output( i, b, b, b ); }
inline void T6W28_Apu::osc_output( int i, Fake_Buffer* b ) { osc_output( i, b, b, b ); }
}

1
src/engine/platform/sound/t6w28/T6W28_Oscs.h
View File

@ -11,6 +11,7 @@ namespace MDFN_IEN_NGP
struct T6W28_Osc
{
Fake_Buffer* outputs[4];
int output_select;
int delay;