79 lines
1.8 KiB
C++
79 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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#ifndef __AUDIO_D_SOUND_H__
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#define __AUDIO_D_SOUND_H__
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#include <stdint.h>
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#include <istream>
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#include <ostream>
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namespace AMeteor
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{
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namespace Audio
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{
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class DSound
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{
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public :
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static const int BUFFER_SIZE = 32;
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DSound ();
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void FillFifo (int8_t* buffer);
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void FillFifo (int8_t sample);
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void NextSample ()
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{
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// if the buffer is empty, there is nothing to do
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if (m_size)
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// if this was the last sample, we reset all and send 0 to all next
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// GetSample()s until the buffer is refilled
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if (--m_size == 0)
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Reset();
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// else, we go on to next sample and we go to the first if we got
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// to the last
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else if (++m_rpos >= BUFFER_SIZE)
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m_rpos = 0;
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}
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void Reset ()
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{
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m_buffer[0] = m_size = m_rpos = m_wpos = 0;
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}
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int8_t GetSample()
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{
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return m_buffer[m_rpos];
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}
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uint8_t GetSize ()
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{
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return m_size;
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};
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bool SaveState (std::ostream& stream);
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bool LoadState (std::istream& stream);
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private :
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int8_t m_buffer[BUFFER_SIZE];
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uint8_t m_rpos, m_wpos;
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uint8_t m_size;
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};
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}
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}
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#endif
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