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Small fixes to division by zero

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This causes crashes in PSP quite often in many games. Other CPUs might
(depending on the processor state) silently return zero or some
undefined value.
The fix is borrowed from ReGBA's codebase
This commit is contained in:
David Guillen Fandos 2021-02-23 20:27:59 +01:00
parent 300d0c0028
commit 349e47f0b2
2 changed files with 6 additions and 3 deletions
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2
gba_memory.c
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@ -199,7 +199,7 @@ static void sound_control_x(u32 value)
#define sound_update_frequency_step(timer_number) \
timer[timer_number].frequency_step = \
float_to_fp8_24(GBC_BASE_RATE / (timer_reload * sound_frequency)) \
float_to_fp8_24((GBC_BASE_RATE / sound_frequency) / (timer_reload)) \
/* Main */
extern timer_type timer[4];

7
sound.c
View file

@ -273,8 +273,11 @@ u32 gbc_sound_master_volume;
else \
rate = rate + (rate >> gs->sweep_shift); \
\
if(rate > 2048) \
rate = 2048; \
if(rate > 2047) { \
rate = 2047; \
gs->active_flag = 0; \
break; \
} \
\
frequency_step = float_to_fp16_16(((131072.0f / (2048 - rate)) * 8.0f) \
/ sound_frequency); \