140 lines
4.7 KiB
C++
140 lines
4.7 KiB
C++
|
|
// Nes_Snd_Emu 0.1.7. http://www.slack.net/~ant/libs/
|
|
|
|
#include "apu_state.h"
|
|
#include "Nes_Apu.h"
|
|
|
|
/* Copyright (C) 2003-2006 Shay Green. This module is free software; you
|
|
can redistribute it and/or modify it under the terms of the GNU Lesser
|
|
General Public License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version. This
|
|
module is distributed in the hope that it will be useful, but WITHOUT ANY
|
|
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
|
|
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
|
|
more details. You should have received a copy of the GNU Lesser General
|
|
Public License along with this module; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
|
|
|
|
#include "blargg_source.h"
|
|
|
|
template<int mode>
|
|
struct apu_reflection
|
|
{
|
|
#define REFLECT( apu, state ) (mode ? void (apu = state) : void (state = apu))
|
|
|
|
static void reflect_env( apu_state_t::env_t* state, Nes_Envelope& osc )
|
|
{
|
|
REFLECT( (*state) [0], osc.env_delay );
|
|
REFLECT( (*state) [1], osc.envelope );
|
|
REFLECT( (*state) [2], osc.reg_written [3] );
|
|
}
|
|
|
|
static void reflect_square( apu_state_t::square_t& state, Nes_Square& osc )
|
|
{
|
|
reflect_env( &state.env, osc );
|
|
REFLECT( state.delay, osc.delay );
|
|
REFLECT( state.length_counter, osc.length_counter );
|
|
REFLECT( state.phase, osc.phase );
|
|
REFLECT( state.swp_delay, osc.sweep_delay );
|
|
REFLECT( state.swp_reset, osc.reg_written [1] );
|
|
}
|
|
|
|
static void reflect_triangle( apu_state_t::triangle_t& state, Nes_Triangle& osc )
|
|
{
|
|
REFLECT( state.delay, osc.delay );
|
|
REFLECT( state.length_counter, osc.length_counter );
|
|
REFLECT( state.linear_counter, osc.linear_counter );
|
|
REFLECT( state.phase, osc.phase );
|
|
REFLECT( state.linear_mode, osc.reg_written [3] );
|
|
}
|
|
|
|
static void reflect_noise( apu_state_t::noise_t& state, Nes_Noise& osc )
|
|
{
|
|
reflect_env( &state.env, osc );
|
|
REFLECT( state.delay, osc.delay );
|
|
REFLECT( state.length_counter, osc.length_counter );
|
|
REFLECT( state.shift_reg, osc.noise );
|
|
}
|
|
|
|
static void reflect_dmc( apu_state_t::dmc_t& state, Nes_Dmc& osc )
|
|
{
|
|
REFLECT( state.delay, osc.delay );
|
|
REFLECT( state.remain, osc.length_counter );
|
|
REFLECT( state.buf, osc.buf );
|
|
REFLECT( state.bits_remain, osc.bits_remain );
|
|
REFLECT( state.bits, osc.bits );
|
|
REFLECT( state.buf_full, osc.buf_full );
|
|
REFLECT( state.silence, osc.silence );
|
|
REFLECT( state.irq_flag, osc.irq_flag );
|
|
if ( mode )
|
|
state.addr = osc.address | 0x8000;
|
|
else
|
|
osc.address = state.addr & 0x7fff;
|
|
}
|
|
};
|
|
|
|
void Nes_Apu::save_state( apu_state_t* state ) const
|
|
{
|
|
for ( int i = 0; i < osc_count * 4; i++ )
|
|
{
|
|
int index = i >> 2;
|
|
state->apu.w40xx [i] = oscs [index]->regs [i & 3];
|
|
//if ( index < 4 )
|
|
// state->length_counters [index] = oscs [index]->length_counter;
|
|
}
|
|
state->apu.w40xx [0x11] = dmc.dac;
|
|
|
|
state->apu.w4015 = osc_enables;
|
|
state->apu.w4017 = frame_mode;
|
|
state->apu.frame_delay = frame_delay;
|
|
state->apu.frame_step = frame;
|
|
state->apu.irq_flag = irq_flag;
|
|
|
|
typedef apu_reflection<1> refl;
|
|
Nes_Apu& apu = *(Nes_Apu*) this; // const_cast
|
|
refl::reflect_square ( state->square1, apu.square1 );
|
|
refl::reflect_square ( state->square2, apu.square2 );
|
|
refl::reflect_triangle( state->triangle, apu.triangle );
|
|
refl::reflect_noise ( state->noise, apu.noise );
|
|
refl::reflect_dmc ( state->dmc, apu.dmc );
|
|
}
|
|
|
|
void Nes_Apu::load_state( apu_state_t const& state )
|
|
{
|
|
reset();
|
|
|
|
write_register( 0, 0x4017, state.apu.w4017 );
|
|
write_register( 0, 0x4015, state.apu.w4015 );
|
|
osc_enables = state.apu.w4015; // DMC clears bit 4
|
|
|
|
for ( int i = 0; i < osc_count * 4; i++ )
|
|
{
|
|
int n = state.apu.w40xx [i];
|
|
int index = i >> 2;
|
|
oscs [index]->regs [i & 3] = n;
|
|
write_register( 0, 0x4000 + i, n );
|
|
//if ( index < 4 )
|
|
// oscs [index]->length_counter = state.length_counters [index];
|
|
}
|
|
|
|
frame_delay = state.apu.frame_delay;
|
|
frame = state.apu.frame_step;
|
|
irq_flag = state.apu.irq_flag;
|
|
|
|
typedef apu_reflection<0> refl;
|
|
apu_state_t& st = (apu_state_t&) state; // const_cast
|
|
refl::reflect_square ( st.square1, square1 );
|
|
refl::reflect_square ( st.square2, square2 );
|
|
refl::reflect_triangle( st.triangle, triangle );
|
|
refl::reflect_noise ( st.noise, noise );
|
|
refl::reflect_dmc ( st.dmc, dmc );
|
|
dmc.recalc_irq();
|
|
|
|
//force channels to have correct last_amp levels after load state
|
|
square1.run(last_time, last_time);
|
|
square2.run(last_time, last_time);
|
|
triangle.run(last_time, last_time);
|
|
noise.run(last_time, last_time);
|
|
dmc.run(last_time, last_time);
|
|
}
|