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b3a96e11ea
A7800DS/arm9/source/emu/HighScore.c
Dave Bernazzani b3a96e11ea Version 4.8 - see readme for details.
2025-02-15 17:24:31 -05:00

317 lines
19 KiB
C
Raw Blame History

// ----------------------------------------------------------------------------
// ___ ___ ___ ___ ___ ____ ___ _ _
// /__/ /__/ / / /__ /__/ /__ / /_ / |/ /
// / / \ /__/ ___/ ___/ ___/ / /__ / / emulator
//
// ----------------------------------------------------------------------------
// Copyright 2005 Greg Stanton
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
// ----------------------------------------------------------------------------
// HighScore.cpp
//
// The HSC hardware uses the Toshiba TC5516APL chip which is 2048 x 8bit (2K)
// and is maintained by a battery CR2032 at 3V
//
// With an SRAM of this vintage, the contents of an uninitialized / freshly
// powered up chip would likely be random values. For emulation purposes, we
// are initializing the SRAM contents on a fresh board as if they were zeros.
//
// With this emulation, each game gets their own private 2K SRAM for the
// HSC memory. Further, to avoid problems with some games that do not initialize
// the SRAM, we are going to use a fresh snapshot of the full 2K of SRAM right
// after a known good cart (Asteroids - NTSC) has initialized the memory.
// ----------------------------------------------------------------------------
#include <fat.h>
#include <dirent.h>
#include <ctype.h>
#include "HighScore.h"
#include "Cartridge.h"
#include "Database.h"
#define HS_SRAM_START 0x1000 // The 7800 RAM memory location of the high score cartridge SRAM
#define HS_SRAM_SIZE 2048 // The size of the high score cartridge SRAM and gets loaded at 7800 memory address 0x1000
#define HSC_CART_ROM_SIZE 4096 // The highscore.rom is exactly 4K in size and gets loaded at 7800 memory address 0x3000
static byte high_score_sram[HS_SRAM_SIZE]; // Buffer for the actual 2K of HSC data
static byte high_score_rom[HSC_CART_ROM_SIZE]; // Buffer for the 4K of high score ROM (highscore.rom)
byte high_score_cart_loaded = false; // Flips to true if the High Score Cart is loaded in memory
// -----------------------------------------------------------------------------------------------------
// This is a snapshot of an initialized HSC after Asteroids (NTSC) initialized it with the name "HSC"
// A few of the modern homebrews don't do a good job of initializing the HSC and so we use this as
// as default starting SRAM (of 0x00 before init) which is squeaky clean and ready for use by the game.
// -----------------------------------------------------------------------------------------------------
unsigned char A7800DS_00_sram[HS_SRAM_SIZE] = {
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};
/*
* Saves the high score cartridge SRAM
*
* return Whether the save was successful (false if game is not supporting HSC)
*/
static char szName[256+4];
static void make_hsc_name(void)
{
// Init HSC filename is same as base filename with .hsc
DIR* dir = opendir("sav");
if (dir) closedir(dir); // Directory exists... close it out and move on.
else mkdir("sav", 0777); // Otherwise create the directory...
sprintf(szName,"sav/%s", cartridge_filename);
int len = strlen(szName);
szName[len-3] = 'h';
szName[len-2] = 's';
szName[len-1] = 'c';
szName[len-0] = 0;
}
// ------------------------------------------------------------------------------------
// Write the full 2K of HSC - a bit wasteful for a single game but we've got plenty
// of space and it turns out to be more flexibile for each game to have their own HSC.
// ------------------------------------------------------------------------------------
bool cartridge_SaveHighScoreSram(void)
{
if(!high_score_cart_loaded || !myCartInfo.hsc)
{
return false; // If we didn't load the high score cartridge, or don't have an HSC enabled cart: don't save.
}
// Make sure something actually changed before writing...
if (memcmp(high_score_sram, memory_ram+HS_SRAM_START, HS_SRAM_SIZE) != 0)
{
memcpy(high_score_sram, memory_ram+HS_SRAM_START, HS_SRAM_SIZE); // Copy from main memory to SRAM buffer
make_hsc_name(); // HSC filename is same as base filename with .hsc extension
// Write out the .hsc file
FILE *handle = fopen(szName, "wb");
if (handle != NULL)
{
fwrite(high_score_sram, HS_SRAM_SIZE, 1, handle);
fclose(handle);
}
}
return true; // We at least made the attempt to write out the .hsc save file
}
/*
* Loads the high score cartridge SRAM
*
* return Whether the load was successful
*/
static bool cartridge_LoadHighScoreSram(void)
{
if(!high_score_cart_loaded || !myCartInfo.hsc)
{
return false; // If we didn't load the high score cartridge, or don't have an HSC enabled cart: don't save.
}
make_hsc_name(); // HSC filename is same as base filename with .hsc extension
// Read back the .hsc file
FILE *handle = fopen(szName, "rb");
if (handle != NULL)
{
fread(high_score_sram, HS_SRAM_SIZE, 1, handle);
fclose(handle);
}
else
{
// No .hsc file was available... so set the SRAM to a known good init value
memcpy(high_score_sram, A7800DS_00_sram, HS_SRAM_SIZE);
}
// Copy from SRAM buffer to main memory for use by the game
for(uint i = 0; i < HS_SRAM_SIZE; i++)
{
memory_Write(HS_SRAM_START + i, high_score_sram[i]);
}
bHSC_dirty = 0; // We don't consider the init of SRAM directly above to be a 'write' (no need to persist)
return true; // HSC SRAM is ready to go!
}
/*
* Loads the high score cartridge
*
* return Whether the load was successful
*/
bool cartridge_LoadHighScoreCart(void)
{
if( !myCartInfo.hsc || myCartInfo.region != 0 )
{
return false; // Only load the cart if it is enabled and the region is NTSC
}
FILE* file = fopen("highscore.rom", "rb" );
// If we don't find it in the current directory, always try /roms/bios and /data/bios
if (file == NULL) file = fopen("/roms/bios/highscore.rom", "rb" );
if (file == NULL) file = fopen("/data/bios/highscore.rom", "rb" );
if(file != NULL)
{
fread(high_score_rom, 1, HSC_CART_ROM_SIZE, file);
for( uint i = 0; i < HSC_CART_ROM_SIZE; i++ )
{
memory_Write(0x3000 + i, high_score_rom[i]);
}
high_score_cart_loaded = true;
// Now read in the associated .hsc SRAM file (or set SRAM to defaults)
cartridge_LoadHighScoreSram();
}
else
{
high_score_cart_loaded = false;
}
return high_score_cart_loaded;
}
// End of file
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