114 lines
2.3 KiB
C++
114 lines
2.3 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 __DMA_H__
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#define __DMA_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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class Dma
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{
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public :
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enum Reason
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{
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Immediately = 0,
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VBlank,
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HBlank,
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Special
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};
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Dma () :
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m_graphic(false)
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{ }
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void Reset ();
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bool GraphicDma () const
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{
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return false;
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//return m_graphic;
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}
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void SetReload(uint8_t channum, uint16_t reload)
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{
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m_chans[channum].reload = reload;
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}
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void UpdateCnt (uint8_t channum);
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void Check(uint8_t channum, uint8_t reason);
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inline void CheckAll(uint8_t reason)
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{
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Check(0, reason);
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Check(1, reason);
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Check(2, reason);
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Check(3, reason);
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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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struct Channel
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{
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Channel () :
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reload(0),
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src(0),
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dest(0),
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count(0),
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control(0)
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{ }
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uint16_t reload;
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uint32_t src;
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uint32_t dest;
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uint16_t count;
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union Control
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{
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Control(uint16_t v) :
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w(v)
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{ }
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uint16_t w;
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struct
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{
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unsigned int unused : 5;
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unsigned int dest : 2;
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unsigned int src : 2;
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unsigned int repeat : 1;
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unsigned int type : 1;
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unsigned int drq : 1;
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unsigned int start : 2;
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unsigned int irq : 1;
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unsigned int enable : 1;
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} b;
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} control;
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};
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Channel m_chans[4];
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bool m_graphic;
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void Process(uint8_t channel);
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void Copy (uint32_t& src, uint32_t& dest, int8_t s_inc, int8_t d_inc,
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uint32_t count, bool word);
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};
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}
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#endif
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