132 lines
2.9 KiB
C++
132 lines
2.9 KiB
C++
/******************************************************************************/
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/* Mednafen Sega Saturn Emulation Module */
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/******************************************************************************/
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/* mouse.cpp:
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** Copyright (C) 2016-2017 Mednafen Team
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**
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** This program is free software; you can redistribute it and/or
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** modify it under the terms of the GNU General Public License
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** as published by the Free Software Foundation; either version 2
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** of the License, or (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, write to the Free Software Foundation, Inc.,
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** 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "common.h"
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#include "mouse.h"
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namespace MDFN_IEN_SS
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{
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IODevice_Mouse::IODevice_Mouse() : buttons(0)
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{
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}
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IODevice_Mouse::~IODevice_Mouse()
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{
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}
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void IODevice_Mouse::Power(void)
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{
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phase = -1;
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tl = true;
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data_out = 0x00;
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accum_xdelta = 0;
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accum_ydelta = 0;
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}
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void IODevice_Mouse::UpdateInput(const uint8* data, const int32 time_elapsed)
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{
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accum_xdelta += data[1];
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accum_ydelta -= data[2];
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buttons = data[0] & 0xF;
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}
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uint8 IODevice_Mouse::UpdateBus(const uint8 smpc_out, const uint8 smpc_out_asserted)
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{
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uint8 tmp;
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if(smpc_out & 0x40)
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{
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if(smpc_out & 0x20)
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{
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if(!tl)
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accum_xdelta = accum_ydelta = 0;
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phase = -1;
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tl = true;
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data_out = 0x00;
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}
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else
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{
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if(tl)
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tl = false;
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}
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}
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else
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{
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if(phase < 0)
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{
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uint8 flags = 0;
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if(accum_xdelta < 0)
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flags |= 0x1;
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if(accum_ydelta < 0)
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flags |= 0x2;
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if(accum_xdelta > 255 || accum_xdelta < -256)
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{
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flags |= 0x4;
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accum_xdelta = (accum_xdelta < 0) ? -256 : 255;
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}
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if(accum_ydelta > 255 || accum_ydelta < -256)
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{
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flags |= 0x8;
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accum_ydelta = (accum_ydelta < 0) ? -256 : 255;
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}
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buffer[0] = 0xB;
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buffer[1] = 0xF;
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buffer[2] = 0xF;
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buffer[3] = flags;
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buffer[4] = buttons;
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buffer[5] = (accum_xdelta >> 4) & 0xF;
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buffer[6] = (accum_xdelta >> 0) & 0xF;
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buffer[7] = (accum_ydelta >> 4) & 0xF;
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buffer[8] = (accum_ydelta >> 0) & 0xF;
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for(int i = 9; i < 16; i++)
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buffer[i] = buffer[8];
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phase++;
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}
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if((bool)(smpc_out & 0x20) != tl)
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{
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phase = (phase + 1) & 0xF;
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tl = !tl;
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if(phase == 8)
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accum_xdelta = accum_ydelta = 0;
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}
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data_out = buffer[phase];
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}
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tmp = (tl << 4) | data_out;
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return (smpc_out & (smpc_out_asserted | 0xE0)) | (tmp &~ smpc_out_asserted);
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}
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}
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