112 lines
2.6 KiB
C++
112 lines
2.6 KiB
C++
// Meteor - A Nintendo Gameboy Advance emulator
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// Copyright (C) 2009-2011 Philippe Daouadi
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "ameteor/sound.hpp"
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#include "globals.hpp"
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#include "ameteor.hpp"
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#include "debug.hpp"
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namespace AMeteor
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{
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Sound::Sound () :
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m_speaker(IO.GetRef16(Io::SOUND1CNT_L), IO.GetRef16(Io::SOUND1CNT_H),
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IO.GetRef16(Io::SOUND1CNT_X),
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IO.GetRef16(Io::SOUND2CNT_L), IO.GetRef16(Io::SOUND2CNT_H),
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IO.GetRef16(Io::SOUND4CNT_L), IO.GetRef16(Io::SOUND4CNT_H),
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IO.GetRef16(Io::SOUNDCNT_L), IO.GetRef16(Io::SOUNDCNT_H),
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IO.GetRef16(Io::SOUNDCNT_X), IO.GetRef16(Io::SOUNDBIAS)),
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m_fATimer(0),
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m_fBTimer(0)
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{
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}
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void Sound::Reset ()
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{
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m_fATimer = m_fBTimer = 0;
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m_speaker.Reset();
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}
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void Sound::UpdateCntH1 (uint8_t val)
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{
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m_fATimer = (val & (0x1 << 10)) ? 1 : 0;
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m_fBTimer = (val & (0x1 << 14)) ? 1 : 0;
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if (val & (0x1 << 3))
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m_speaker.ResetFifoA();
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if (val & (0x1 << 7))
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m_speaker.ResetFifoB();
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}
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void Sound::TimerOverflow (uint8_t timernum)
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{
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// both fifo may be triggered by the same timer
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if (m_fATimer == timernum)
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TimerOverflowA();
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if (m_fBTimer == timernum)
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TimerOverflowB();
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}
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inline void Sound::TimerOverflowA ()
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{
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if (m_speaker.GetSizeA() <= 16)
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{
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DMA.Check(1, Dma::Special);
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if (m_speaker.GetSizeA() <= 16)
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{
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int8_t buf[16] = {0};
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m_speaker.FillFifoA(buf);
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}
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}
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m_speaker.NextSampleA ();
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}
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inline void Sound::TimerOverflowB ()
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{
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if (m_speaker.GetSizeB() <= 16)
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{
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DMA.Check(2, Dma::Special);
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if (m_speaker.GetSizeB() <= 16)
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{
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int8_t buf[16] = {0};
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m_speaker.FillFifoB(buf);
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}
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}
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m_speaker.NextSampleB ();
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}
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bool Sound::SaveState (std::ostream& stream)
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{
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SS_WRITE_VAR(m_fATimer);
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SS_WRITE_VAR(m_fBTimer);
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if (!m_speaker.SaveState(stream))
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return false;
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return true;
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}
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bool Sound::LoadState (std::istream& stream)
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{
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SS_READ_VAR(m_fATimer);
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SS_READ_VAR(m_fBTimer);
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if (!m_speaker.LoadState(stream))
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return false;
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return true;
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}
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}
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