83 lines
1.8 KiB
C++
83 lines
1.8 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/audio/dsound.hpp"
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#include "../globals.hpp"
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#include <cstring>
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namespace AMeteor
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{
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namespace Audio
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{
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DSound::DSound () :
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m_rpos(0),
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m_wpos(0),
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m_size(0)
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{
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std::memset(m_buffer, 0, sizeof(m_buffer));
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}
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void DSound::FillFifo (int8_t* buffer)
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{
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int8_t* pmbuf = m_buffer + m_wpos;
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// we copy 16 bytes of data
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for (int8_t* pbuf = buffer;
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pbuf < buffer + BUFFER_SIZE/2 && m_size < 32; ++pbuf, ++pmbuf)
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{
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if (pmbuf >= m_buffer + BUFFER_SIZE)
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pmbuf = m_buffer;
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*pmbuf = *pbuf;
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++m_size;
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}
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m_wpos = pmbuf - m_buffer;
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}
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void DSound::FillFifo (int8_t sample)
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{
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if (m_size == 32)
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return;
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if (m_wpos == BUFFER_SIZE)
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m_wpos = 0;
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m_buffer[m_wpos++] = sample;
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++m_size;
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}
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bool DSound::SaveState (std::ostream& stream)
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{
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SS_WRITE_VAR(m_rpos);
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SS_WRITE_VAR(m_wpos);
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SS_WRITE_VAR(m_size);
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SS_WRITE_ARRAY(m_buffer);
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return true;
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}
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bool DSound::LoadState (std::istream& stream)
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{
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SS_READ_VAR(m_rpos);
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SS_READ_VAR(m_wpos);
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SS_READ_VAR(m_size);
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SS_READ_ARRAY(m_buffer);
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return true;
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}
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}
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}
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