genesis: big savestate rework. all old savestates are invalid. saveram is now stored in savestate. non-megaCD savestates should be significantly smaller than before; megaCD savestates should be slightly larger.

BizHawk.Emulation.Cores/Consoles/Sega/gpgx/GPGX.cs

@@ -108,8 +108,16 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 					CoreComm.VsyncDen = fpsden;
 				}
 
-				savebuff = new byte[LibGPGX.gpgx_state_size()];
-				savebuff2 = new byte[savebuff.Length + 13];
+				// compute state size
+				{
+					byte[] tmp = new byte[LibGPGX.gpgx_state_max_size()];
+					int size = LibGPGX.gpgx_state_size(tmp, tmp.Length);
+					if (size <= 0)
+						throw new Exception("Couldn't Determine GPGX internal state size!");
+					savebuff = new byte[size];
+					savebuff2 = new byte[savebuff.Length + 13];
+					Console.WriteLine("GPGX Internal State Size: {0}", size);
+				}
 
 				SetControllerDefinition();
 

BizHawk.Emulation.Cores/Consoles/Sega/gpgx/LibGPGX.cs

@@ -36,7 +36,9 @@ namespace BizHawk.Emulation.Cores.Consoles.Sega.gpgx
 		public static extern void gpgx_get_fps(ref int num, ref int den);
 
 		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
-		public static extern int gpgx_state_size();
+		public static extern int gpgx_state_max_size();
+		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern int gpgx_state_size(byte[] dest, int size);
 		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern bool gpgx_state_save(byte[] dest, int size);
 		[DllImport("libgenplusgx.dll", CallingConvention = CallingConvention.Cdecl)]

genplus-gx/cinterface/cinterface.c

@@ -106,25 +106,36 @@ GPGX_EX void gpgx_get_fps(int *num, int *den)
 	}
 }
 
-GPGX_EX int gpgx_state_size(void)
+GPGX_EX int gpgx_state_max_size(void)
 {
-	return STATE_SIZE;
+	// original state size, plus 64K sram or 16K ebram, plus 8K ibram or seeprom control structures
+	return STATE_SIZE + (64 + 8) * 1024;
+}
+
+GPGX_EX int gpgx_state_size(void *dest, int size)
+{
+	int actual = 0;
+	if (size < gpgx_state_max_size())
+		return -1;
+
+	actual = state_save((unsigned char*) dest);
+	if (actual > size)
+		// fixme!
+		return -1;
+	return actual;
 }
 
 GPGX_EX int gpgx_state_save(void *dest, int size)
 {
-	if (size != STATE_SIZE)
-		return 0;
-
-	return !!state_save((unsigned char*) dest);
+	return state_save((unsigned char*) dest) == size;
 }
 
 GPGX_EX int gpgx_state_load(void *src, int size)
 {
-	if (size != STATE_SIZE)
+	if (!size)
 		return 0;
 
-	if (state_load((unsigned char *) src))
+	if (state_load((unsigned char *) src) == size)
 	{
 		update_viewport();
 		return 1;
@@ -200,28 +211,7 @@ GPGX_EX void gpgx_advance(void)
 // internal: computes sram size (no brams)
 int saveramsize(void)
 {
-	if (!sram.on)
-		return 0;
-	switch (sram.custom)
-	{
-	case 0: // plain bus access saveram
-		break;
-	case 1: // i2c
-		return eeprom_i2c.config.size_mask + 1;
-	case 2: // spi
-		return 0x10000; // it doesn't appear to mask anything internally
-	case 3: // 93c
-		return 0x10000; // SMS only and i don't have time to look into it
-	default:
-		return 0x10000; // who knows
-	}
-	// figure size for plain bus access saverams
-	{
-		int startaddr = sram.start / 8192;
-		int endaddr = sram.end / 8192 + 1;
-		int size = (endaddr - startaddr) * 8192;
-		return size;
-	}
+	return sram_get_actual_size();
 }
 
 GPGX_EX void gpgx_clear_sram(void)

genplus-gx/core/cart_hw/eeprom_93c.c

@@ -52,7 +52,7 @@ void eeprom_93c_init()
   /* default eeprom state */
   memset(&eeprom_93c, 0, sizeof(T_EEPROM_93C));
   eeprom_93c.data = 1;
-  eeprom_93c.state = WAIT_START;
+  eeprom_93c.state = WAIT_START93;
   sram.custom = 3;
 }
 
@@ -67,19 +67,19 @@ void eeprom_93c_write(unsigned char data)
       /* Current EEPROM state */
       switch (eeprom_93c.state)
       {
-        case WAIT_START:
+        case WAIT_START93:
         {
           /* Wait for START bit */
           if (data & (1 << BIT_DATA))
           {
             eeprom_93c.opcode = 0;
             eeprom_93c.cycles = 0;
-            eeprom_93c.state = GET_OPCODE;
+            eeprom_93c.state = GET_OPCODE93;
           }
           break;
         }
 
-        case GET_OPCODE:
+        case GET_OPCODE93:
         {
           /* 8-bit buffer (opcode + address) */
           eeprom_93c.opcode |= ((data >> BIT_DATA) & 1) << (7 - eeprom_93c.cycles);
@@ -95,7 +95,7 @@ void eeprom_93c_write(unsigned char data)
                 /* WRITE */
                 eeprom_93c.buffer = 0;
                 eeprom_93c.cycles = 0;
-                eeprom_93c.state = WRITE_WORD;
+                eeprom_93c.state = WRITE_WORD93;
                 break;
               }
 
@@ -104,7 +104,7 @@ void eeprom_93c_write(unsigned char data)
                 /* READ */
                 eeprom_93c.buffer = *(uint16 *)(sram.sram + ((eeprom_93c.opcode & 0x3F) << 1));
                 eeprom_93c.cycles = 0;
-                eeprom_93c.state = READ_WORD;
+                eeprom_93c.state = READ_WORD93;
 
                 /* Force DATA OUT */
                 eeprom_93c.data = 0;
@@ -120,7 +120,7 @@ void eeprom_93c_write(unsigned char data)
                 }
 
                 /* wait for next command */
-                eeprom_93c.state = WAIT_STANDBY;
+                eeprom_93c.state = WAIT_STANDBY93;
                 break;
               }
 
@@ -134,7 +134,7 @@ void eeprom_93c_write(unsigned char data)
                     /* WRITE ALL */
                     eeprom_93c.buffer = 0;
                     eeprom_93c.cycles = 0;
-                    eeprom_93c.state = WRITE_WORD;
+                    eeprom_93c.state = WRITE_WORD93;
                     break;
                   }
 
@@ -147,7 +147,7 @@ void eeprom_93c_write(unsigned char data)
                     }
 
                     /* wait for next command */
-                    eeprom_93c.state = WAIT_STANDBY;
+                    eeprom_93c.state = WAIT_STANDBY93;
                     break;
                   }
 
@@ -157,7 +157,7 @@ void eeprom_93c_write(unsigned char data)
                     eeprom_93c.we = (eeprom_93c.opcode >> 4) & 1;
 
                     /* wait for next command */
-                    eeprom_93c.state = WAIT_STANDBY;
+                    eeprom_93c.state = WAIT_STANDBY93;
                     break;
                   }
                 }
@@ -168,7 +168,7 @@ void eeprom_93c_write(unsigned char data)
           break;
         }
 
-        case WRITE_WORD:
+        case WRITE_WORD93:
         {
           /* 16-bit data buffer */
           eeprom_93c.buffer |= ((data >> BIT_DATA) & 1) << (15 - eeprom_93c.cycles);
@@ -197,12 +197,12 @@ void eeprom_93c_write(unsigned char data)
             }
 
             /* wait for next command */
-            eeprom_93c.state = WAIT_STANDBY;
+            eeprom_93c.state = WAIT_STANDBY93;
           }
           break;
         }
 
-        case READ_WORD:
+        case READ_WORD93:
         {
           /* set DATA OUT */
           eeprom_93c.data = ((eeprom_93c.buffer >> (15 - eeprom_93c.cycles)) & 1);
@@ -233,7 +233,7 @@ void eeprom_93c_write(unsigned char data)
     {
       /* standby mode */
       eeprom_93c.data = 1;
-      eeprom_93c.state = WAIT_START;
+      eeprom_93c.state = WAIT_START93;
     }
   }
 

genplus-gx/core/cart_hw/eeprom_93c.h

@@ -41,11 +41,11 @@
 
 typedef enum
 {
-  WAIT_STANDBY,
-  WAIT_START,
-  GET_OPCODE,
-  WRITE_WORD,
-  READ_WORD
+  WAIT_STANDBY93,
+  WAIT_START93,
+  GET_OPCODE93,
+  WRITE_WORD93,
+  READ_WORD93
 } T_STATE_93C;
 
 typedef struct

genplus-gx/core/cart_hw/eeprom_spi.c

@@ -37,6 +37,7 @@
  ****************************************************************************************/
 
 #include "shared.h"
+#include "eeprom_spi.h"
 
 /* max supported size 64KB (25x512/95x512) */
 #define SIZE_MASK 0xffff
@@ -48,28 +49,6 @@
 #define BIT_HOLD (2)
 #define BIT_CS   (3)
 
-typedef enum
-{
-  STANDBY,
-  GET_OPCODE,
-  GET_ADDRESS,
-  WRITE_BYTE,
-  READ_BYTE
-} T_STATE_SPI;
-
-typedef struct
-{
-  uint8 cs;           /* !CS line state */
-  uint8 clk;          /* SCLK line state */
-  uint8 out;          /* SO line state */
-  uint8 status;       /* status register */
-  uint8 opcode;       /* 8-bit opcode */
-  uint8 buffer;       /* 8-bit data buffer */
-  uint16 addr;        /* 16-bit address */
-  uint32 cycles;      /* current operation cycle */
-  T_STATE_SPI state;  /* current operation state */
-} T_EEPROM_SPI;
-
 T_EEPROM_SPI spi_eeprom;
 
 void eeprom_spi_init()

genplus-gx/core/cart_hw/eeprom_spi.h

@@ -39,6 +39,30 @@
 #ifndef _EEPROM_SPI_H_
 #define _EEPROM_SPI_H_
 
+typedef enum
+{
+  STANDBY,
+  GET_OPCODE,
+  GET_ADDRESS,
+  WRITE_BYTE,
+  READ_BYTE
+} T_STATE_SPI;
+
+typedef struct
+{
+  uint8 cs;           /* !CS line state */
+  uint8 clk;          /* SCLK line state */
+  uint8 out;          /* SO line state */
+  uint8 status;       /* status register */
+  uint8 opcode;       /* 8-bit opcode */
+  uint8 buffer;       /* 8-bit data buffer */
+  uint16 addr;        /* 16-bit address */
+  uint32 cycles;      /* current operation cycle */
+  T_STATE_SPI state;  /* current operation state */
+} T_EEPROM_SPI;
+
+extern T_EEPROM_SPI spi_eeprom;
+
 /* Function prototypes */
 extern void eeprom_spi_init();
 extern void eeprom_spi_write(unsigned char data);

genplus-gx/core/cart_hw/sram.c

@@ -37,6 +37,9 @@
  ****************************************************************************************/
 
 #include "shared.h"
+#include "eeprom_i2c.h"
+#include "eeprom_spi.h"
+#include "eeprom_93c.h"
 
 T_SRAM sram;
 
@@ -69,7 +72,7 @@ void sram_init()
 
   /* initialize Backup RAM */
   memset(sram.sram, 0xFF, 0x10000);
-  sram.crc = crc32(0, sram.sram, 0x10000);
+  //sram.crc = crc32(0, sram.sram, 0x10000);
 
   /* retrieve informations from header */
   if ((READ_BYTE(cart.rom,0x1b0) == 0x52) && (READ_BYTE(cart.rom,0x1b1) == 0x41))
@@ -221,3 +224,74 @@ void sram_write_word(unsigned int address, unsigned int data)
   sram.sram[address] = data >> 8;
   sram.sram[address + 1] = data & 0xff;
 }
+
+// the variables in SRAM_T are all part of "configuration", so we don't have to save those.
+// the only thing that needs to be saved is the SRAM itself and the SEEPROM struct (if applicable)
+
+int sram_context_save(uint8 *state)
+{
+	int bufferptr = 0;
+	if (!sram.on)
+		return 0;
+	save_param(sram.sram, sram_get_actual_size());
+	switch (sram.custom)
+	{
+	case 1:
+		save_param(&eeprom_i2c, sizeof(eeprom_i2c));
+		break;
+	case 2:
+		save_param(&spi_eeprom, sizeof(spi_eeprom));
+		break;
+	case 3:
+		save_param(&eeprom_93c, sizeof(eeprom_93c));
+		break;
+	}
+	return bufferptr;
+}
+
+int sram_context_load(uint8 *state)
+{
+	int bufferptr = 0;
+	if (!sram.on)
+		return 0;
+	load_param(sram.sram, sram_get_actual_size());
+	switch (sram.custom)
+	{
+	case 1:
+		load_param(&eeprom_i2c, sizeof(eeprom_i2c));
+		break;
+	case 2:
+		load_param(&spi_eeprom, sizeof(spi_eeprom));
+		break;
+	case 3:
+		load_param(&eeprom_93c, sizeof(eeprom_93c));
+		break;
+	}
+	return bufferptr;
+}
+
+int sram_get_actual_size()
+{
+	if (!sram.on)
+		return 0;
+	switch (sram.custom)
+	{
+	case 0: // plain bus access saveram
+		break;
+	case 1: // i2c
+		return eeprom_i2c.config.size_mask + 1;
+	case 2: // spi
+		return 0x10000; // it doesn't appear to mask anything internally
+	case 3: // 93c
+		return 0x10000; // SMS only and i don't have time to look into it
+	default:
+		return 0x10000; // who knows
+	}
+	// figure size for plain bus access saverams
+	{
+		int startaddr = sram.start / 8192;
+		int endaddr = sram.end / 8192 + 1;
+		int size = (endaddr - startaddr) * 8192;
+		return size;
+	}
+}

genplus-gx/core/cart_hw/sram.h

@@ -46,7 +46,7 @@ typedef struct
   uint8 custom;
   uint32 start;
   uint32 end;
-  uint32 crc;
+  //uint32 crc;
   uint8 *sram;
 } T_SRAM;
 
@@ -57,6 +57,10 @@ extern unsigned int sram_read_word(unsigned int address);
 extern void sram_write_byte(unsigned int address, unsigned int data);
 extern void sram_write_word(unsigned int address, unsigned int data);
 
+extern int sram_context_save(uint8 *state);
+extern int sram_context_load(uint8 *state);
+extern int sram_get_actual_size();
+
 /* global variables */
 extern T_SRAM sram;
 

genplus-gx/core/cd_hw/scd.c

@@ -1441,6 +1441,11 @@ int scd_context_save(uint8 *state)
     bufferptr += md_cart_context_save(&state[bufferptr]);
   }
 
+  save_param(scd.bram, 0x2000);
+  // we don't save scd.cartridge.id separately, so it must be non-changing!
+  if (scd.cartridge.id)
+	  save_param(scd.cartridge.area, scd.cartridge.mask + 1);
+
   return bufferptr;
 }
 
@@ -1641,6 +1646,11 @@ int scd_context_load(uint8 *state)
     bufferptr += md_cart_context_load(&state[bufferptr]);
   }
 
+  load_param(scd.bram, 0x2000);
+  // we don't save scd.cartridge.id separately, so it must be non-changing!
+  if (scd.cartridge.id)
+	  load_param(scd.cartridge.area, scd.cartridge.mask + 1);
+
   return bufferptr;
 }
 

genplus-gx/core/state.c

@@ -189,6 +189,8 @@ int state_load(unsigned char *state)
     sms_cart_switch(~io_reg[0x0E]);
   }
 
+  bufferptr += sram_context_load(&state[bufferptr]);
+
   load_param(&bitmap.viewport, sizeof(bitmap.viewport));
 
   return bufferptr;
@@ -282,6 +284,8 @@ int state_save(unsigned char *state)
     bufferptr += sms_cart_context_save(&state[bufferptr]);
   }
 
+  bufferptr += sram_context_save(&state[bufferptr]);
+
   save_param(&bitmap.viewport, sizeof(bitmap.viewport));
 
   /* return total size */