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fix some pcspeaker mode (high-frequency reloading); fixes Test Drive/Grand Prix Cycles and similar

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@2920
This commit is contained in:
Sebastian Strohhäcker 2007-07-15 16:36:27 +00:00
parent 6f9374b2de
commit 83de8ea88c
1 changed files with 8 additions and 3 deletions
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11
src/hardware/pcspeaker.cpp
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@ -16,7 +16,7 @@
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
/* $Id: pcspeaker.cpp,v 1.23 2007-01-08 19:45:40 qbix79 Exp $ */
/* $Id: pcspeaker.cpp,v 1.24 2007-07-15 16:36:27 c2woody Exp $ */
#include <math.h>
#include "dosbox.h"
@ -57,6 +57,7 @@ static struct {
float volwant,volcur;
Bitu last_ticks;
float last_index;
Bitu min_tr;
DelayEntry entries[SPKR_ENTRIES];
Bitu used;
} spkr;
@ -134,6 +135,9 @@ static void ForwardPIT(float newindex) {
spkr.pit_last=-SPKR_VOLUME;
if (spkr.mode==SPKR_PIT_ON) AddDelayEntry(delay_base,spkr.pit_last);
spkr.pit_index=spkr.pit_half;
/* Load the new count */
spkr.pit_half=spkr.pit_new_half;
spkr.pit_max=spkr.pit_new_max;
} else {
spkr.pit_index+=passed;
return;
@ -189,8 +193,8 @@ void PCSPEAKER_SetCounter(Bitu cntr,Bitu mode) {
spkr.pit_max=(1000.0f/PIT_TICK_RATE)*cntr;
break;
case 3: /* Square wave generator */
if (cntr<=40) {
/* Makes DIGGER sound better */
if (cntr<spkr.min_tr) {
/* skip frequencies that can't be represented */
spkr.pit_last=0;
spkr.pit_mode=0;
return;
@ -328,6 +332,7 @@ public:
spkr.pit_new_max=spkr.pit_max;
spkr.pit_new_half=spkr.pit_half;
spkr.pit_index=0;
spkr.min_tr=(PIT_TICK_RATE+spkr.rate/2-1)/(spkr.rate/2);
spkr.used=0;
/* Register the sound channel */
spkr.chan=MixerChan.Install(&PCSPEAKER_CallBack,spkr.rate,"SPKR");