125 lines
4.2 KiB
C++
125 lines
4.2 KiB
C++
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// Nes_Snd_Emu 0.1.7. http://www.slack.net/~ant/libs/
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#include "apu_snapshot.h"
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#include "Nes_Apu.h"
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/* Copyright (C) 2003-2005 Shay Green. This module is free software; you
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can redistribute it and/or modify it under the terms of the GNU Lesser
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General Public License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version. This
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module is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details. You should have received a copy of the GNU Lesser General
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Public License along with this module; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include BLARGG_SOURCE_BEGIN
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template<int mode>
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struct apu_reflection
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{
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#define REFLECT( apu, state ) (mode ? void (apu = state) : void (state = apu))
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static void reflect_env( apu_snapshot_t::env_t& state, Nes_Envelope& osc )
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{
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REFLECT( state [0], osc.env_delay );
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REFLECT( state [1], osc.envelope );
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REFLECT( state [2], osc.reg_written [3] );
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}
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static void reflect_square( apu_snapshot_t::square_t& state, Nes_Square& osc )
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{
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reflect_env( state.env, osc );
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REFLECT( state.delay, osc.delay );
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REFLECT( state.length, osc.length_counter );
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REFLECT( state.phase, osc.phase );
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REFLECT( state.swp_delay, osc.sweep_delay );
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REFLECT( state.swp_reset, osc.reg_written [1] );
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}
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static void reflect_triangle( apu_snapshot_t::triangle_t& state, Nes_Triangle& osc )
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{
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REFLECT( state.delay, osc.delay );
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REFLECT( state.length, osc.length_counter );
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REFLECT( state.linear_counter, osc.linear_counter );
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REFLECT( state.linear_mode, osc.reg_written [3] );
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}
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static void reflect_noise( apu_snapshot_t::noise_t& state, Nes_Noise& osc )
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{
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reflect_env( state.env, osc );
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REFLECT( state.delay, osc.delay );
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REFLECT( state.length, osc.length_counter );
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REFLECT( state.shift_reg, osc.noise );
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}
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static void reflect_dmc( apu_snapshot_t::dmc_t& state, Nes_Dmc& osc )
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{
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REFLECT( state.delay, osc.delay );
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REFLECT( state.remain, osc.length_counter );
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REFLECT( state.buf, osc.buf );
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REFLECT( state.bits_remain, osc.bits_remain );
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REFLECT( state.bits, osc.bits );
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REFLECT( state.buf_empty, osc.buf_empty );
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REFLECT( state.silence, osc.silence );
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REFLECT( state.irq_flag, osc.irq_flag );
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if ( mode )
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state.addr = osc.address | 0x8000;
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else
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osc.address = state.addr & 0x7fff;
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}
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};
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void Nes_Apu::save_snapshot( apu_snapshot_t* state ) const
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{
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for ( int i = 0; i < osc_count * 4; i++ )
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state->w40xx [i] = oscs [i >> 2]->regs [i & 3];
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state->w40xx [0x11] = dmc.dac;
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state->w4015 = osc_enables;
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state->w4017 = frame_mode;
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state->delay = frame_delay;
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state->step = frame;
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state->irq_flag = irq_flag;
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typedef apu_reflection<1> refl;
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Nes_Apu& apu = *(Nes_Apu*) this; // const_cast
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refl::reflect_square ( state->square1, apu.square1 );
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refl::reflect_square ( state->square2, apu.square2 );
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refl::reflect_triangle( state->triangle, apu.triangle );
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refl::reflect_noise ( state->noise, apu.noise );
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refl::reflect_dmc ( state->dmc, apu.dmc );
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}
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void Nes_Apu::load_snapshot( apu_snapshot_t const& state )
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{
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reset();
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write_register( 0, 0x4017, state.w4017 );
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write_register( 0, 0x4015, state.w4015 );
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for ( int i = 0; i < osc_count * 4; i++ )
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{
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int n = state.w40xx [i];
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oscs [i >> 2]->regs [i & 3] = n;
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write_register( 0, 0x4000 + i, n );
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}
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frame_delay = state.delay;
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frame = state.step;
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irq_flag = state.irq_flag;
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typedef apu_reflection<0> refl;
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apu_snapshot_t& st = (apu_snapshot_t&) state; // const_cast
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refl::reflect_square ( st.square1, square1 );
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refl::reflect_square ( st.square2, square2 );
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refl::reflect_triangle( st.triangle, triangle );
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refl::reflect_noise ( st.noise, noise );
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refl::reflect_dmc ( st.dmc, dmc );
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dmc.recalc_irq();
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dmc.last_amp = dmc.dac;
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}
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