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[libretro] improved system region swapping

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This commit is contained in:
EkeEke 2016-09-02 16:33:54 +02:00
parent 740f690de8
commit b5c243664d
2 changed files with 84 additions and 22 deletions
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builds/genesis_plus_gx_libretro.dll
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libretro/libretro.c
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@ -70,8 +70,6 @@ static bool is_running = 0;
static uint8_t temp[0x10000];
static int16 soundbuffer[3068];
static uint16_t bitmap_data_[720 * 576];
static const double pal_fps = 53203424.0 / (3420.0 * 313.0);
static const double ntsc_fps = 53693175.0 / (3420.0 * 262.0);
static char g_rom_dir[256];
static char g_rom_name[256];
@ -727,6 +725,7 @@ static void check_variables(void)
bool update_viewports = false;
bool reinit = false;
struct retro_variable var = {0};
struct retro_system_av_info info;
var.key = "genesis_plus_gx_bram";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
@ -800,6 +799,24 @@ static void check_variables(void)
}
}
var.key = "genesis_plus_gx_bios";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
orig_value = config.bios;
if (!strcmp(var.value, "enabled"))
config.bios = 3;
else
config.bios = 0;
if (orig_value != config.bios)
{
if (system_hw)
{
reinit = true;
}
}
}
var.key = "genesis_plus_gx_region_detect";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
@ -818,25 +835,70 @@ static void check_variables(void)
if (system_hw)
{
get_region(NULL);
reinit = true;
}
}
}
if ((system_hw == SYSTEM_MCD) || ((system_hw & SYSTEM_SMS) && config.bios))
{
/* system with region BIOS should be reinitialized */
reinit = true;
}
else
{
static const uint16 vc_table[4][2] =
{
/* NTSC, PAL */
{0xDA , 0xF2}, /* Mode 4 (192 lines) */
{0xEA , 0x102}, /* Mode 5 (224 lines) */
{0xDA , 0xF2}, /* Mode 4 (192 lines) */
{0x106, 0x10A} /* Mode 5 (240 lines) */
};
var.key = "genesis_plus_gx_bios";
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var);
{
orig_value = config.bios;
if (!strcmp(var.value, "enabled"))
config.bios = 3;
else
config.bios = 0;
/* framerate might have changed, reinitialize audio timings */
audio_set_rate(44100, 0);
/* reinitialize I/O region register */
if (system_hw == SYSTEM_MD)
{
io_reg[0x00] = 0x20 | region_code | (config.bios & 1);
}
else if (system_hw == SYSTEM_MCD)
{
io_reg[0x00] = region_code | (config.bios & 1);
}
else
{
io_reg[0x00] = 0x80 | (region_code >> 1);
}
if (orig_value != config.bios)
{
if (system_hw)
{
reinit = true;
/* reinitialize VDP timings */
lines_per_frame = vdp_pal ? 313 : 262;
/* reinitialize NTSC/PAL mode in VDP status */
if (system_hw & SYSTEM_MD)
{
status = (status & ~1) | vdp_pal;
}
/* reinitialize VC max value */
switch (bitmap.viewport.h)
{
case 192:
vc_max = vc_table[0][vdp_pal];
break;
case 224:
vc_max = vc_table[1][vdp_pal];
break;
case 240:
vc_max = vc_table[3][vdp_pal];
break;
}
/* force overscan change */
bitmap.viewport.changed = 3;
/* reinitialize libretro audio/video timings */
retro_get_system_av_info(&info);
environ_cb(RETRO_ENVIRONMENT_SET_SYSTEM_AV_INFO, &info);
}
}
}
}
@ -1017,7 +1079,7 @@ static void check_variables(void)
if (reinit)
{
audio_init(44100, snd.frame_rate);
audio_init(44100, 0);
memcpy(temp, sram.sram, sizeof(temp));
system_init();
system_reset();
@ -1574,7 +1636,7 @@ void retro_get_system_av_info(struct retro_system_av_info *info)
info->geometry.max_width = 720;
info->geometry.max_height = 576;
info->geometry.aspect_ratio = 4.0 / 3.0;
info->timing.fps = snd.frame_rate;
info->timing.fps = (double)(system_clock) / (double)lines_per_frame / (double)MCYCLES_PER_LINE;
info->timing.sample_rate = 44100;
}
@ -1836,7 +1898,7 @@ bool retro_load_game(const struct retro_game_info *info)
}
}
audio_init(44100, vdp_pal ? pal_fps : ntsc_fps);
audio_init(44100,0);
system_init();
system_reset();
is_running = false;