otomatalabs/furnace
7
0
Fork 0
Code Issues Pull requests Actions Packages Projects Releases Wiki Activity

NES: fix a little accuracy problem

Browse source
This commit is contained in:
tildearrow 2025-03-07 02:31:38 -05:00
parent 54d1998c70
commit 86fb92595a
2 changed files with 28 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

18
src/engine/platform/sound/nes/apu.h
View file

@ -211,7 +211,11 @@ enum apu_mode { APU_60HZ, APU_48HZ };
square.sweep.negate = value & 0x08
#define square_reg2(square)\
/* timer (low 8 bits) */\
square.timer = (square.timer & 0x0700) | value
square.timer = (square.timer & 0x0700) | value;\
if (!square.firstTime) {\
square.frequency=1;\
square.firstTime=1;\
}
#define square_reg3(square,length_clocked)\
/* length counter */\
/*\
@ -232,7 +236,11 @@ enum apu_mode { APU_60HZ, APU_48HZ };
/*The correct behaviour is to reset the duty cycle sequencers but not the clock dividers*/\
/*square.frequency = 1;*/\
/* sequencer */\
square.sequencer = 0
square.sequencer = 0;\
if (!square.firstTime) {\
square.frequency=1;\
square.firstTime=1;\
}
#define init_nla_table(p, t)\
{\
WORD i;\
@ -328,6 +336,8 @@ typedef struct _apuSquare {
DBWORD timer;
/* ogni quanti cicli devo generare un output */
WORD frequency;
/* optimization */
BYTE firstTime;
/* duty */
BYTE duty;
/* envelope */
@ -354,6 +364,8 @@ typedef struct _apuTriangle {
_length_counter length;
/* sequencer */
BYTE sequencer;
/* optimization */
BYTE firstTime;
/* output */
SWORD output;
} _apuTriangle;
@ -374,6 +386,8 @@ typedef struct _apuNoise {
_length_counter length;
/* sequencer */
BYTE sequencer;
/* optimization */
BYTE firstTime;
/* output */
SWORD output;
} _apuNoise;

12
src/engine/platform/sound/nes/cpu_inline.h
View file

@ -105,6 +105,10 @@ INLINE static void apu_wr_reg(struct NESAPU* a, int ts, WORD address, BYTE value
if (address == 0x400A) {
/* timer (low 8 bits) */
a->TR.timer = (a->TR.timer & 0x0700) | value;
if (!a->TR.firstTime) {
a->TR.firstTime=1;
a->TR.frequency=1;
}
return;
}
if (address == 0x400B) {
@ -127,6 +131,10 @@ INLINE static void apu_wr_reg(struct NESAPU* a, int ts, WORD address, BYTE value
* automaticamente l'halt flag del triangle.
*/
a->TR.linear.halt = TRUE;
if (!a->TR.firstTime) {
a->TR.firstTime=1;
a->TR.frequency=1;
}
return;
}
return;
@ -143,6 +151,10 @@ INLINE static void apu_wr_reg(struct NESAPU* a, int ts, WORD address, BYTE value
if (address == 0x400E) {
a->NS.mode = value & 0x80;
a->NS.timer = value & 0x0F;
if (!a->NS.firstTime) {
a->NS.firstTime=1;
a->NS.frequency=1;
}
return;
}
if (address == 0x400F) {