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cebix |
1.1 |
/* |
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* SID_Acorn.h - 6581 emulation, RISC OS specific stuff |
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* |
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cebix |
1.4 |
* Frodo (C) 1994-1997,2002-2005 Christian Bauer |
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cebix |
1.1 |
* |
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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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} |
