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Add support for emulated Game Genie add-on

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This commit is contained in:
jdgleaver
2021-10-21 15:52:40 +01:00
parent 98b2ae09ab
commit 1a961ff6be
12 changed files with 240 additions and 84 deletions
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139
src/drivers/libretro/libretro.c
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@@ -65,6 +65,9 @@
#define NES_4_3 ((width / (height * (256.0 / 240.0))) * 4.0 / 3.0)
#define NES_PP ((width / (height * (256.0 / 240.0))) * 16.0 / 15.0)
#define NES_PAL_FPS (838977920.0 / 16777215.0)
#define NES_NTSC_FPS (1008307711.0 / 16777215.0)
#if defined(_3DS)
void* linearMemAlign(size_t size, size_t alignment);
void linearFree(void* mem);
@@ -148,6 +151,7 @@ static enum RetroZapperInputModes zappermode = RetroLightgun;
static bool libretro_supports_bitmasks = false;
static bool libretro_supports_option_categories = false;
static unsigned libretro_msg_interface_version = 0;
/* emulator-specific variables */
@@ -282,11 +286,54 @@ void FCEUD_Message(char *s)
log_cb.log(RETRO_LOG_INFO, "%s", s);
}
void FCEUD_DispMessage(char *m)
{ struct retro_message msg;
msg.msg = m;
msg.frames = 180;
environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE, &msg);
void FCEUD_DispMessage(enum retro_log_level level, unsigned duration, char *str)
{
if (!environ_cb)
return;
if (libretro_msg_interface_version >= 1)
{
struct retro_message_ext msg;
unsigned priority;
switch (level)
{
case RETRO_LOG_ERROR:
priority = 5;
break;
case RETRO_LOG_WARN:
priority = 4;
break;
case RETRO_LOG_INFO:
priority = 3;
break;
case RETRO_LOG_DEBUG:
default:
priority = 1;
break;
}
msg.msg = str;
msg.duration = duration;
msg.priority = priority;
msg.level = level;
msg.target = RETRO_MESSAGE_TARGET_OSD;
msg.type = RETRO_MESSAGE_TYPE_NOTIFICATION_ALT;
msg.progress = -1;
environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE_EXT, &msg);
}
else
{
float fps = (FSettings.PAL || dendy) ? NES_PAL_FPS : NES_NTSC_FPS;
unsigned frames = (unsigned)(((float)duration * fps / 1000.0f) + 0.5f);
struct retro_message msg;
msg.msg = str;
msg.frames = frames;
environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE, &msg);
}
}
void FCEUD_SoundToggle (void)
@@ -1024,6 +1071,40 @@ static void set_variables(void)
}
}
/* Game Genie add-on must be enabled before
* loading content, so we cannot parse this
* option inside check_variables() */
static void check_game_genie_variable(void)
{
struct retro_variable var = {0};
int game_genie_enabled = 0;
var.key = "fceumm_game_genie";
/* Game Genie is only enabled for regular
* cartridges (excludes arcade content,
* FDS games, etc.) */
if ((GameInfo->type == GIT_CART) &&
(iNESCart.mapper != 105) && /* Nintendo World Championship cart (Mapper 105)*/
environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) &&
var.value &&
!strcmp(var.value, "enabled"))
game_genie_enabled = 1;
FCEUI_SetGameGenie(game_genie_enabled);
}
/* Callback passed to FCEUI_LoadGame()
* > Required since we must set and check
* core options immediately after ROM
* is loaded, before FCEUI_LoadGame()
* returns */
static void frontend_post_load_init()
{
set_variables();
check_game_genie_variable();
}
void retro_set_environment(retro_environment_t cb)
{
struct retro_vfs_interface_info vfs_iface_info;
@@ -1140,9 +1221,9 @@ void retro_get_system_av_info(struct retro_system_av_info *info)
info->geometry.aspect_ratio = get_aspect_ratio(width, height);
info->timing.sample_rate = (float)sndsamplerate;
if (FSettings.PAL || dendy)
info->timing.fps = 838977920.0/16777215.0;
info->timing.fps = NES_PAL_FPS;
else
info->timing.fps = 1008307711.0/16777215.0;
info->timing.fps = NES_NTSC_FPS;
}
static void check_system_specs(void)
@@ -1162,6 +1243,9 @@ void retro_init(void)
if (environ_cb(RETRO_ENVIRONMENT_GET_INPUT_BITMASKS, NULL))
libretro_supports_bitmasks = true;
environ_cb(RETRO_ENVIRONMENT_GET_MESSAGE_INTERFACE_VERSION,
&libretro_msg_interface_version);
}
static void retro_set_custom_palette(void)
@@ -1232,15 +1316,15 @@ static void FCEUD_RegionOverride(unsigned region)
pal = systemRegion & 1;
break;
case 1: /* ntsc */
FCEU_DispMessage("System: NTSC");
FCEUD_DispMessage(RETRO_LOG_INFO, 2000, "System: NTSC");
break;
case 2: /* pal */
pal = 1;
FCEU_DispMessage("System: PAL");
FCEUD_DispMessage(RETRO_LOG_INFO, 2000, "System: PAL");
break;
case 3: /* dendy */
d = 1;
FCEU_DispMessage("System: Dendy");
FCEUD_DispMessage(RETRO_LOG_INFO, 2000, "System: Dendy");
break;
}
@@ -1265,6 +1349,7 @@ void retro_deinit (void)
ps2 = NULL;
#endif
libretro_supports_bitmasks = false;
libretro_msg_interface_version = 0;
DPSW_Cleanup();
#ifdef HAVE_NTSC_FILTER
NTSCFilter_Cleanup();
@@ -1456,9 +1541,6 @@ static void check_variables(bool startup)
FCEU_ZapperSetTolerance(atoi(var.value));
}
var.key = "fceumm_region";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
var.key = "fceumm_show_crosshair";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
@@ -1479,7 +1561,6 @@ static void check_variables(bool startup)
audio_video_updated = 1;
}
}
#else
var.key = "fceumm_overscan_h";
@@ -1505,6 +1586,7 @@ static void check_variables(bool startup)
}
}
#endif
var.key = "fceumm_aspect";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
@@ -1545,6 +1627,7 @@ static void check_variables(bool startup)
nes_input.turbo_delay = atoi(var.value);
var.key = "fceumm_region";
if (environ_cb(RETRO_ENVIRONMENT_GET_VARIABLE, &var) && var.value)
{
unsigned oldval = opt_region;
@@ -2060,6 +2143,11 @@ size_t retro_serialize_size(void)
bool retro_serialize(void *data, size_t size)
{
/* Cannot save state while Game Genie
* screen is open */
if (geniestage == 1)
return false;
if (size != retro_serialize_size())
return false;
@@ -2070,6 +2158,11 @@ bool retro_serialize(void *data, size_t size)
bool retro_unserialize(const void * data, size_t size)
{
/* Cannot load state while Game Genie
* screen is open */
if (geniestage == 1)
return false;
if (size != retro_serialize_size())
return false;
@@ -2581,17 +2674,16 @@ bool retro_load_game(const struct retro_game_info *info)
FCEUI_SetSoundVolume(sndvolume);
FCEUI_Sound(sndsamplerate);
GameInfo = (FCEUGI*)FCEUI_LoadGame(content_path, content_data, content_size);
GameInfo = (FCEUGI*)FCEUI_LoadGame(content_path, content_data, content_size,
frontend_post_load_init);
if (!GameInfo)
{
struct retro_message msg;
char msg_local[256];
sprintf(msg_local, "ROM loading failed...");
msg.msg = msg_local;
msg.frames = 360;
if (environ_cb)
environ_cb(RETRO_ENVIRONMENT_SET_MESSAGE, (void*)&msg);
#if 0
/* An error message here is superfluous - the frontend
* will report that content loading has failed */
FCEUD_DispMessage(RETRO_LOG_ERROR, 3000, "ROM loading failed...");
#endif
return false;
}
@@ -2612,7 +2704,6 @@ bool retro_load_game(const struct retro_game_info *info)
ResetPalette();
FCEUD_SoundToggle();
set_variables();
check_variables(true);
PowerNES();