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root/cebix/Frodo4/Src/SID_Acorn.h
Revision: 1.4
Committed: 2005-06-27T19:55:48Z (17 years, 5 months ago) by cebix
Content type: text/plain
Branch: MAIN
CVS Tags: VERSION_4_2, HEAD
Changes since 1.3: +1 -1 lines
Log Message:
updated copyright dates

File Contents

# Content
1 /*
2 * SID_Acorn.h - 6581 emulation, RISC OS specific stuff
3 *
4 * Frodo (C) 1994-1997,2002-2005 Christian Bauer
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 */
20
21 #include "C64.h"
22
23
24 void DigitalRenderer::init_sound(void)
25 {
26 _kernel_oserror *err;
27
28 ready = false; sound_buffer = NULL;
29 if ((DigitalRenderer_ReadState() & DRState_Active) != 0)
30 {
31 _kernel_oserror dra;
32
33 dra.errnum = 0; sprintf(dra.errmess,"Can't claim sound system -- already active!");
34 Wimp_ReportError(&dra,1,TASKNAME); return;
35 }
36 // Try starting up the renderer
37 sndbufsize = 2*224; linecnt = 0;
38 if ((err = DigitalRenderer_Activate(1,sndbufsize,1000000/SAMPLE_FREQ)) != NULL)
39 {
40 Wimp_ReportError(err,1,TASKNAME); return;
41 }
42 sound_buffer = new uint8[sndbufsize];
43 ready = true;
44 }
45
46
47
48
49 DigitalRenderer::~DigitalRenderer()
50 {
51 if (ready)
52 {
53 _kernel_oserror *err;
54
55 delete sound_buffer;
56 if ((err = DigitalRenderer_Deactivate()) != NULL)
57 {
58 Wimp_ReportError(err,1,TASKNAME);
59 }
60 }
61 }
62
63
64
65
66 void DigitalRenderer::EmulateLine(void)
67 {
68 if (ready)
69 {
70 sample_buf[sample_in_ptr++] = volume;
71 // faster than modulo; usually there shouldn't be a loop (while)...
72 while (sample_in_ptr >= SAMPLE_BUF_SIZE) {sample_in_ptr -= SAMPLE_BUF_SIZE;}
73
74 // A similar approach to the HP variant: check every <number> of lines if
75 // new sample needed.
76 if (--linecnt < 0)
77 {
78 int status;
79
80 linecnt = the_c64->PollSoundAfter;
81 if ((status = DigitalRenderer_ReadState()) > 0)
82 {
83 if ((status & DRState_NeedData) != 0)
84 {
85 calc_buffer(sound_buffer, sndbufsize);
86 DigitalRenderer_NewSample(sound_buffer);
87 }
88 }
89 }
90 }
91 }
92
93
94
95
96 void DigitalRenderer::Pause(void)
97 {
98 if (ready) {DigitalRenderer_Pause();}
99 }
100
101
102
103
104 void DigitalRenderer::Resume(void)
105 {
106 if (ready) {DigitalRenderer_Resume();}
107 }