[Core/CD] added CD-AUDIO & CD+G support

core/cart_hw/sms_cart.c

@@ -514,7 +514,7 @@ void sms_cart_init(void)
   if (config.bios & 1)
   {
     /* load BIOS file */
-    int bios_size = load_bios();
+    int bios_size = load_bios(system_hw);
 
     if (bios_size > 0xC000)
     {

core/cd_hw/cdd.h

@@ -58,9 +58,6 @@
 #define CD_STOP  0x09
 #define CD_END   0x0C
 
-/* CD blocks scanning speed */
-#define CD_SCAN_SPEED 30
-
 #define CD_MAX_TRACKS 100
 
 /* CD track */
@@ -73,6 +70,7 @@ typedef struct
   int offset;
   int start;
   int end;
+  int type;
 } track_t; 
 
 /* CD TOC */
@@ -81,6 +79,7 @@ typedef struct
   int end;
   int last;
   track_t tracks[CD_MAX_TRACKS];
+  FILE *sub;
 } toc_t; 
 
 /* CDD hardware */

core/cd_hw/scd.c

@@ -573,6 +573,13 @@ static unsigned int scd_read_byte(unsigned int address)
     s68k_poll_detect(1 << (address & 0x1f));
   }
 
+  /* Subcode buffer */
+  else if (address >= 0xff8100)
+  {
+    /* 64 x 16-bit mirrored */
+    address &= 0x17f;
+  }
+
   /* default registers */
   if (address & 1)
   {
@@ -663,6 +670,13 @@ static unsigned int scd_read_word(unsigned int address)
     s68k_poll_detect(3 << (address & 0x1e));
   }
 
+  /* Subcode buffer */
+  else if (address >= 0xff8100)
+  {
+    /* 64 x 16-bit mirrored */
+    address &= 0x17f;
+  }
+
   /* default registers */
   return scd.regs[(address >> 1) & 0xff].w;
 }

core/loadrom.c

@@ -2,7 +2,7 @@
  *  Genesis Plus
  *  ROM Loading Support
  *
- *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003  Charles Mac Donald (original code)
+ *  Copyright (C) 1998-2003  Charles Mac Donald (original code)
  *  Copyright (C) 2007-2015  Eke-Eke (Genesis Plus GX)
  *
  *  Redistribution and use of this code or any derivative works are permitted
@@ -389,11 +389,11 @@ void getrominfo(char *romheader)
  * Return loaded size (-1 if already loaded)
  *
  ***************************************************************************/
-int load_bios(void)
+int load_bios(int system)
 {
   int size = 0;
 
-  switch (system_hw)
+  switch (system)
   {
     case SYSTEM_MCD:
     {
@@ -532,10 +532,11 @@ int load_rom(char *filename)
   int i, size;
 
 #ifdef USE_DYNAMIC_ALLOC
-  /* allocate memory for Cartridge /CD hardware buffer if required */
+  if (!ext)
-  if (ext == NULL)
   {
+    /* allocate memory for Cartridge / CD hardware if required */
     ext = (external_t *)malloc(sizeof(external_t));
+    if (!ext) return (0);
   }
 #endif
 
@@ -550,30 +551,28 @@ int load_rom(char *filename)
     cdd.loaded = 0;
   }
 
-  /* auto-detect CD image files */
+  /* auto-detect CD image file */
   size = cdd_load(filename, (char *)(cart.rom));
   if (size < 0)
   {
     /* error opening file */
-    return 0;
+    return (0);
   }
 
-  if (size > 0)
+  /* CD image file ? */
+  if (size)
   {
-    /* CD image file loaded */
+    /* enable CD hardware */
     system_hw = SYSTEM_MCD;
+
+    /* boot from CD hardware */
+    scd.cartridge.boot = 0x00;
   }
   else
   {
     /* load file into ROM buffer */
     char extension[4];
-    size = load_archive(filename, cart.rom, sizeof(cart.rom), extension);
+    size = load_archive(filename, cart.rom, cdd.loaded ? 0x800000 : MAXROMSIZE, extension);
-    if (!size)
-    {
-      /* mark all BOOTROM as unloaded since they could have been overwritten */
-      system_bios &= ~(0x10 | SYSTEM_SMS | SYSTEM_GG);
-      return 0;
-    }
 
     /* mark BOOTROM as unloaded if they have been overwritten by cartridge ROM */
     if (size > 0x800000)
@@ -586,8 +585,16 @@ int load_rom(char *filename)
       /* Master System or Game Gear BIOS ROM are loaded within $400000-$4FFFFF area */
       system_bios &= ~(SYSTEM_SMS | SYSTEM_GG);
     }
+    else if (size <= 0)
+    {
+      /* mark all BOOTROM as unloaded since they could have been overwritten */
+      system_bios &= ~(0x10 | SYSTEM_SMS | SYSTEM_GG);
+      
+      /* error loading file */
+      return 0;
+    }
 
-    /* convert lower case to upper case */
+    /* convert lower case file extension to upper case */
     *(uint32 *)(extension) &= 0xdfdfdfdf;
 
     /* auto-detect system hardware from ROM file extension */
@@ -608,7 +615,7 @@ int load_rom(char *filename)
     }
     else
     {
-      /* Mega Drive hardware (Genesis mode) */
+      /* default is Mega Drive / Genesis hardware (16-bit mode) */
       system_hw = SYSTEM_MD;
 
       /* decode .MDX format */
@@ -641,7 +648,7 @@ int load_rom(char *filename)
       size -= 512;
       memcpy (cart.rom, cart.rom + 512, size);
 
-      /* assume interleaved Genesis ROM format (.smd) */
+      /* assume interleaved Mega Drive / Genesis ROM format (.smd) */
       if (system_hw == SYSTEM_MD)
       {
         for (i = 0; i < (size / 0x4000); i++)
@@ -661,26 +668,9 @@ int load_rom(char *filename)
   /* set console region */
   get_region((char *)(cart.rom));
 
-  /* CD image file */
-  if (system_hw == SYSTEM_MCD)
-  {   
-    /* load CD BOOT ROM */
-    if (!load_bios())
-    {
-      /* unmount CD image */
-      cdd_unload();
-
-      /* error loading CD BOOT ROM */
-      return (0);
-    }
-
-    /* boot from CD */
-    scd.cartridge.boot = 0x00;
-  }
-
 #ifdef LSB_FIRST
   /* 16-bit ROM specific */
-  else if (system_hw == SYSTEM_MD)
+  if (system_hw == SYSTEM_MD)
   {
     /* Byteswap ROM to optimize 16-bit access */
     for (i = 0; i < cart.romsize; i += 2)
@@ -701,14 +691,28 @@ int load_rom(char *filename)
 
   /* Save auto-detected system hardware  */
   romtype = system_hw;
+  
+  /* CD image file */
+  if (system_hw == SYSTEM_MCD)
+  {   
+    /* try to load CD BOOTROM for selected region */
+    if (!load_bios(SYSTEM_MCD))
+    {
+      /* unmount CD image */
+      cdd_unload();
+
+      /* error booting from CD */
+      return (0);
+    }
+  }
 
   /* CD BOOTROM */
-  if (strstr(rominfo.ROMType, "BR") != NULL)
+  else if (strstr(rominfo.ROMType, "BR") != NULL)
   {
     /* enable CD hardware */
     system_hw = SYSTEM_MCD;
 
-    /* boot from CD */
+    /* boot from CD hardware */
     scd.cartridge.boot = 0x00;
 
     /* copy ROM to BOOTROM area */
@@ -721,7 +725,26 @@ int load_rom(char *filename)
     system_bios = (system_bios & 0xf0) | (region_code >> 4);
   }
 
-  /* ROM cartridges with CD support */
+  /* ROM cartridge with CD loaded */
+  else if (cdd.loaded)
+  {
+    /* try to load CD BOOTROM */
+    if (load_bios(SYSTEM_MCD))
+    {
+      /* enable CD hardware */
+      system_hw = SYSTEM_MCD;
+
+      /* boot from cartridge */
+      scd.cartridge.boot = 0x40;
+    }
+    else
+    {
+      /* unmount CD image */
+      cdd_unload();
+    }    
+  }
+  
+  /* ROM cartridge with CD support */
   else if ((strstr(rominfo.domestic,"FLUX") != NULL) ||
            (strstr(rominfo.domestic,"WONDER LIBRARY") != NULL) ||
            (strstr(rominfo.product,"T-5740") != NULL))
@@ -729,33 +752,23 @@ int load_rom(char *filename)
     /* check if console hardware is set to AUTO */
     if (!config.system)
     {
-      /* auto-enable CD hardware */
-      system_hw = SYSTEM_MCD;
-
       /* try to load CD BOOTROM */
-      if (load_bios())
+      if (load_bios(SYSTEM_MCD))
       {
         char fname[256];
         int len = strlen(filename);
 
+        /* automatically try to load associated .iso file */
+        while ((len && (filename[len] != '.')) || (len > 251)) len--;
+        strncpy(fname, filename, len);
+        strcpy(&fname[len], ".iso");
+        cdd_load(fname, (char *)cdc.ram);
+
+        /* enable CD hardware */
+        system_hw = SYSTEM_MCD;
+
         /* boot from cartridge */
         scd.cartridge.boot = 0x40;
-
-        /* change ROM filename extension to .iso */
-        while (len && (filename[len-1] != '.')) len--;
-        if (len < 253)
-        {
-          strncpy(fname, filename, len);
-          strcpy(&fname[len], "iso");
-        }
-
-        /* automatically load associated .iso image */
-        cdd_load(fname, (char *)cdc.ram);
-      }
-      else
-      {
-        /* if not found, disable CD hardware */
-        system_hw = SYSTEM_MD;
       }
     }
   }
@@ -980,19 +993,19 @@ void get_region(char *romheader)
     if (system_hw == SYSTEM_MCD)
     {
       /* security code */
-      switch (romheader[0x20b])
+      switch ((unsigned char)romheader[0x20b])
       {
-        case 0x7a:
-          region_code = REGION_USA;
-          break;
-
         case 0x64:
           region_code = REGION_EUROPE;
           break;
    
-        default:
+        case 0xa1:
           region_code = REGION_JAPAN_NTSC;
           break;
+
+        default:
+          region_code = REGION_USA;
+          break;
       }
     }
 

core/loadrom.h

@@ -2,7 +2,7 @@
  *  Genesis Plus
  *  ROM Loading Support
  *
- *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003  Charles Mac Donald (original code)
+ *  Copyright (C) 1998-2003  Charles Mac Donald (original code)
  *  Copyright (C) 2007-2015  Eke-Eke (Genesis Plus GX)
  *
  *  Redistribution and use of this code or any derivative works are permitted
@@ -64,7 +64,7 @@ extern ROMINFO rominfo;
 extern uint8 romtype;
 
 /* Function prototypes */
-extern int load_bios(void);
+extern int load_bios(int system);
 extern int load_rom(char *filename);
 extern void get_region(char *romheader);
 extern char *get_company(void);