frodo-wii/Src/SID_Acorn.h
2009-01-13 18:46:42 +00:00

108 lines
2.5 KiB
C

/*
* SID_Acorn.h - 6581 emulation, RISC OS specific stuff
*
* Frodo (C) 1994-1997,2002-2005 Christian Bauer
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "C64.h"
void DigitalRenderer::init_sound(void)
{
_kernel_oserror *err;
ready = false; sound_buffer = NULL;
if ((DigitalRenderer_ReadState() & DRState_Active) != 0)
{
_kernel_oserror dra;
dra.errnum = 0; sprintf(dra.errmess,"Can't claim sound system -- already active!");
Wimp_ReportError(&dra,1,TASKNAME); return;
}
// Try starting up the renderer
sndbufsize = 2*224; linecnt = 0;
if ((err = DigitalRenderer_Activate(1,sndbufsize,1000000/SAMPLE_FREQ)) != NULL)
{
Wimp_ReportError(err,1,TASKNAME); return;
}
sound_buffer = new uint8[sndbufsize];
ready = true;
}
DigitalRenderer::~DigitalRenderer()
{
if (ready)
{
_kernel_oserror *err;
delete sound_buffer;
if ((err = DigitalRenderer_Deactivate()) != NULL)
{
Wimp_ReportError(err,1,TASKNAME);
}
}
}
void DigitalRenderer::EmulateLine(void)
{
if (ready)
{
sample_buf[sample_in_ptr++] = volume;
// faster than modulo; usually there shouldn't be a loop (while)...
while (sample_in_ptr >= SAMPLE_BUF_SIZE) {sample_in_ptr -= SAMPLE_BUF_SIZE;}
// A similar approach to the HP variant: check every <number> of lines if
// new sample needed.
if (--linecnt < 0)
{
int status;
linecnt = the_c64->PollSoundAfter;
if ((status = DigitalRenderer_ReadState()) > 0)
{
if ((status & DRState_NeedData) != 0)
{
calc_buffer(sound_buffer, sndbufsize);
DigitalRenderer_NewSample(sound_buffer);
}
}
}
}
}
void DigitalRenderer::Pause(void)
{
if (ready) {DigitalRenderer_Pause();}
}
void DigitalRenderer::Resume(void)
{
if (ready) {DigitalRenderer_Resume();}
}