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https://github.com/Oibaf66/frodo-wii.git
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108 lines
2.5 KiB
C
108 lines
2.5 KiB
C
/*
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* SID_Acorn.h - 6581 emulation, RISC OS specific stuff
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*
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* Frodo (C) 1994-1997,2002-2005 Christian Bauer
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "C64.h"
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void DigitalRenderer::init_sound(void)
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{
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_kernel_oserror *err;
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ready = false; sound_buffer = NULL;
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if ((DigitalRenderer_ReadState() & DRState_Active) != 0)
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{
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_kernel_oserror dra;
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dra.errnum = 0; sprintf(dra.errmess,"Can't claim sound system -- already active!");
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Wimp_ReportError(&dra,1,TASKNAME); return;
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}
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// Try starting up the renderer
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sndbufsize = 2*224; linecnt = 0;
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if ((err = DigitalRenderer_Activate(1,sndbufsize,1000000/SAMPLE_FREQ)) != NULL)
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{
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Wimp_ReportError(err,1,TASKNAME); return;
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}
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sound_buffer = new uint8[sndbufsize];
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ready = true;
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}
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DigitalRenderer::~DigitalRenderer()
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{
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if (ready)
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{
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_kernel_oserror *err;
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delete sound_buffer;
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if ((err = DigitalRenderer_Deactivate()) != NULL)
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{
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Wimp_ReportError(err,1,TASKNAME);
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}
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}
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}
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void DigitalRenderer::EmulateLine(void)
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{
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if (ready)
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{
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sample_buf[sample_in_ptr++] = volume;
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// faster than modulo; usually there shouldn't be a loop (while)...
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while (sample_in_ptr >= SAMPLE_BUF_SIZE) {sample_in_ptr -= SAMPLE_BUF_SIZE;}
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// A similar approach to the HP variant: check every <number> of lines if
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// new sample needed.
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if (--linecnt < 0)
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{
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int status;
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linecnt = the_c64->PollSoundAfter;
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if ((status = DigitalRenderer_ReadState()) > 0)
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{
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if ((status & DRState_NeedData) != 0)
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{
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calc_buffer(sound_buffer, sndbufsize);
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DigitalRenderer_NewSample(sound_buffer);
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}
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}
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}
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}
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}
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void DigitalRenderer::Pause(void)
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{
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if (ready) {DigitalRenderer_Pause();}
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}
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void DigitalRenderer::Resume(void)
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{
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if (ready) {DigitalRenderer_Resume();}
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}
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