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add lowpass filter core option

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hunterk 2017-09-13 09:49:50 -05:00
parent 346d3b9cb5
commit 7f3d999735
2 changed files with 79 additions and 7 deletions
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84
libretro/libretro.c
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@ -114,6 +114,8 @@ static uint8_t temp[0x10000];
static int16 soundbuffer[3068];
static uint16_t bitmap_data_[720 * 576];
static bool restart_eq = false;
static char g_rom_dir[256];
static char g_rom_name[256];
static char *save_dir;
@ -148,6 +150,11 @@ static char ggvalidchars[] = "ABCDEFGHJKLMNPRSTVWXYZ0123456789";
static char arvalidchars[] = "0123456789ABCDEF";
#define SOUND_FREQUENCY 44100
/* Hide the EQ settings for now */
//#define HAVE_EQ
/************************************
* Genesis Plus GX implementation
************************************/
@ -502,9 +509,9 @@ static void config_default(void)
config.lp_range = 0x9999; /* 0.6 in 16.16 fixed point */
config.low_freq = 880;
config.high_freq = 5000;
config.lg = 1.0;
config.mg = 1.0;
config.hg = 1.0;
config.lg = 100.0;
config.mg = 100.0;
config.hg = 100.0;
config.dac_bits = 14; /* MAX DEPTH */
config.ym2413 = 2; /* AUTO */
config.mono = 0; /* STEREO output */
@ -1025,6 +1032,54 @@ static void check_variables(void)
}
}
}
var.key = "genesis_plus_gx_audio_filter";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
if (!strcmp(var.value, "Lowpass"))
config.filter = 1;
#if HAVE_EQ
else if (!strcmp(var.value, "EQ"))
config.filter = 2;
#endif
else
config.filter = 0;
}
var.key = "genesis_plus_gx_lowpass_range";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
config.lp_range = (atoi(var.value) * 65536) / 100;
}
#if HAVE_EQ
var.key = "genesis_plus_gx_audio_eq_low";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
uint8_t new_lg = atoi(var.value);
if (new_lg != config.lg) restart_eq = true;
config.lg = new_lg;
}
var.key = "genesis_plus_gx_audio_eq_mid";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
uint8_t new_mg = atoi(var.value);
if (new_mg != config.mg) restart_eq = true;
config.mg = new_mg;
}
var.key = "genesis_plus_gx_audio_eq_high";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
uint8_t new_hg = atoi(var.value);
if (new_hg != config.hg) restart_eq = true;
config.hg = new_hg;
}
#endif
var.key = "genesis_plus_gx_dac_bits";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
@ -1156,7 +1211,7 @@ static void check_variables(void)
if (reinit)
{
audio_init(44100, 0);
audio_init(SOUND_FREQUENCY, 0);
memcpy(temp, sram.sram, sizeof(temp));
system_init();
system_reset();
@ -1573,6 +1628,15 @@ void retro_set_environment(retro_environment_t cb)
{ "genesis_plus_gx_lock_on", "Cartridge lock-on; disabled|game genie|action replay (pro)|sonic & knuckles" },
{ "genesis_plus_gx_ym2413", "Master System FM; auto|disabled|enabled" },
{ "genesis_plus_gx_dac_bits", "YM2612 DAC quantization; disabled|enabled" },
{ "genesis_plus_gx_audio_filter", "Audio filter; disabled|Lowpass" },
{ "genesis_plus_gx_lowpass_range", "Low-pass filter %; 60|65|70|75|80|85|90|95|5|10|15|20|25|30|35|40|45|50|55"},
#if HAVE_EQ
{ "genesis_plus_gx_audio_eq_low", "EQ Low; 100|0|5|10|15|20|25|30|35|40|45|50|55|60|65|70|75|80|85|90|95" },
{ "genesis_plus_gx_audio_eq_mid", "EQ Mid; 100|0|5|10|15|20|25|30|35|40|45|50|55|60|65|70|75|80|85|90|95" },
{ "genesis_plus_gx_audio_eq_high", "EQ High; 100|0|5|10|15|20|25|30|35|40|45|50|55|60|65|70|75|80|85|90|95" },
#endif
{ "genesis_plus_gx_blargg_ntsc_filter", "Blargg NTSC filter; disabled|monochrome|composite|svideo|rgb" },
{ "genesis_plus_gx_lcd_filter", "LCD Ghosting filter; disabled|enabled" },
{ "genesis_plus_gx_overscan", "Borders; disabled|top/bottom|left/right|full" },
@ -1750,6 +1814,7 @@ void retro_set_audio_sample_batch(retro_audio_sample_batch_t cb) { audio_cb = cb
void retro_set_input_poll(retro_input_poll_t cb) { input_poll_cb = cb; }
void retro_set_input_state(retro_input_state_t cb) { input_state_cb = cb; }
void retro_get_system_info(struct retro_system_info *info)
{
info->library_name = "Genesis Plus GX";
@ -1770,7 +1835,7 @@ void retro_get_system_av_info(struct retro_system_av_info *info)
info->geometry.max_height = 576;
info->geometry.aspect_ratio = vaspect_ratio;
info->timing.fps = (double)(system_clock) / (double)lines_per_frame / (double)MCYCLES_PER_LINE;
info->timing.sample_rate = 44100;
info->timing.sample_rate = SOUND_FREQUENCY;
}
void retro_set_controller_port_device(unsigned port, unsigned device)
@ -2087,7 +2152,7 @@ bool retro_load_game(const struct retro_game_info *info)
}
}
audio_init(44100,0);
audio_init(SOUND_FREQUENCY, 0);
system_init();
system_reset();
is_running = false;
@ -2265,7 +2330,14 @@ void retro_run(void)
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE_UPDATE, &updated);
if (updated)
{
check_variables();
if (restart_eq)
{
audio_set_equalizer();
restart_eq = false;
}
}
}
#undef CHUNKSIZE

2
libretro/osd.h
View File

@ -92,7 +92,7 @@ struct
uint8 mono;
int16 psg_preamp;
int16 fm_preamp;
int16 lp_range;
uint16 lp_range;
int16 low_freq;
int16 high_freq;
int16 lg;