palette: Allow loading external palette file

src/drivers/libretro/libretro.c

@@ -197,6 +197,7 @@ FILE *FCEUD_UTF8fopen(const char *n, const char *m)
 
 /*palette for FCEU*/
 #define MAXPAL 28 /* max # of palettes in array + 2 for "default" and "raw" */
+int external_palette_exist = 0;
 
 struct st_palettes {
 	char name[32];
@@ -728,7 +729,7 @@ void retro_set_controller_port_device(unsigned a, unsigned b)
 void retro_set_environment(retro_environment_t cb)
 {
    static const struct retro_variable vars[] = {
-      { "fceumm_palette", "Color Palette; default|asqrealc|loopy|quor|chris|matt|pasofami|crashman|mess|zaphod-cv|zaphod-smb|vs-drmar|vs-cv|vs-smb|nintendo-vc|yuv-v3|unsaturated-final|sony-cxa2025as-us|pal|bmf-final2|bmf-final3|smooth-fbx|composite-direct-fbx|pvm-style-d93-fbx|ntsc-hardware-fbx|nes-classic-fbx-fs|nescap|wavebeam|raw" },
+      { "fceumm_palette", "Color Palette; default|asqrealc|loopy|quor|chris|matt|pasofami|crashman|mess|zaphod-cv|zaphod-smb|vs-drmar|vs-cv|vs-smb|nintendo-vc|yuv-v3|unsaturated-final|sony-cxa2025as-us|pal|bmf-final2|bmf-final3|smooth-fbx|composite-direct-fbx|pvm-style-d93-fbx|ntsc-hardware-fbx|nes-classic-fbx-fs|nescap|wavebeam|raw|custom" },
       { "fceumm_nospritelimit", "No Sprite Limit; disabled|enabled" },
       { "fceumm_overclocking", "Overclocking; disabled|2x-Postrender|2x-VBlank" },
 #ifdef PSP
@@ -809,10 +810,21 @@ static void retro_set_custom_palette (void)
 {
    uint8_t i,r,g,b;
 
+   ipalette = 0;
    use_raw_palette = false;
 
-   if (current_palette == 0) /* default palette */
+   if (current_palette == 0 || current_palette > MAXPAL)
    {
+      if (current_palette > MAXPAL)
+      {
+         if (external_palette_exist)
+            ipalette = 1;
+         else
+         {
+            FCEU_PrintError("nes.pal not found in system directory.\n");
+            FCEU_PrintError("Using default palette instead.\n");
+         }
+      }
       FCEU_ResetPalette();	/* Do palette reset*/
       return;
    }
@@ -996,6 +1008,8 @@ static void check_variables(bool startup)
          current_palette = 27;
       else if (!strcmp(var.value, "raw"))
          current_palette = MAXPAL;
+      else if (!strcmp(var.value, "custom"))
+         current_palette = MAXPAL+1;
 
       if (current_palette != orig_value)
          retro_set_custom_palette();
@@ -1798,6 +1812,9 @@ bool retro_load_game(const struct retro_game_info *game)
    FCEUI_SetInput(0, SI_GAMEPAD, &JSReturn[0], 0);
    FCEUI_SetInput(1, SI_GAMEPAD, &JSReturn[0], 0);
 
+   FCEU_LoadGamePalette(); /* check and load external palette nes.pal... */
+   external_palette_exist = ipalette; /* save status if found or not */
+
    retro_set_custom_palette();
 
    FCEUD_SoundToggle();

src/general.c

@@ -82,13 +82,10 @@ char *FCEU_MakeFName(int type, int id1, char *cd1)
          sprintf(tmp, "%s"PSS "disksys.rom", BaseDirectory);
          break;
       case FCEUMKF_PALETTE:
-         if (odirs[FCEUIOD_MISC])
-            sprintf(tmp, "%s"PSS "%s.pal", odirs[FCEUIOD_MISC], FileBase);
-         else
-            sprintf(tmp, "%s"PSS "gameinfo"PSS "%s.pal", BaseDirectory, FileBase);
+         sprintf(tmp, "%s"PSS "nes.pal", BaseDirectory);
          break;
       case FCEUMKF_FDS:
-            sprintf(tmp, "%s"PSS "%s.sav", SaveDirectory, FileBase);
+         sprintf(tmp, "%s"PSS "%s.sav", SaveDirectory, FileBase);
          break;
       default:
          break;

src/palette.c

@@ -182,7 +182,7 @@ static void CalculatePalette(void) {
 	WritePalette();
 }
 
-static int ipalette = 0;
+int ipalette = 0;
 
 void FCEU_LoadGamePalette(void) {
 	uint8 ptmp[192];

src/palette.h

@@ -6,6 +6,7 @@ typedef struct {
 } pal;
 
 extern pal *palo;
+extern int ipalette;
 void FCEU_ResetPalette(void);
 
 void FCEU_ResetPalette(void);