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BizHawk/genplus-gx/cinterface/cinterface.c

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C
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#include <stddef.h>
#include <stdarg.h>
#include <stdio.h>
#ifdef _MSC_VER
#define snprintf _snprintf
#endif
#include "shared.h"
#include "libretro.h"
#include "state.h"
#include "genesis.h"
#include "md_ntsc.h"
#include "sms_ntsc.h"
char GG_ROM[256] = "GG_ROM"; // game genie rom
char AR_ROM[256] = "AR_ROM"; // actin replay rom
char SK_ROM[256] = "SK_ROM"; // sanic and knuckles
char SK_UPMEM[256] = "SK_UPMEM"; // sanic and knuckles
char GG_BIOS[256] = "GG_BIOS"; // game gear bootrom
char CD_BIOS_EU[256] = "CD_BIOS_EU"; // cd bioses
char CD_BIOS_US[256] = "CD_BIOS_US";
char CD_BIOS_JP[256] = "CD_BIOS_JP";
char MS_BIOS_US[256] = "MS_BIOS_US"; // master system bioses
char MS_BIOS_EU[256] = "MS_BIOS_EU";
char MS_BIOS_JP[256] = "MS_BIOS_JP";
char romextension[4];
static uint32_t bitmap_data_[1024 * 512];
static int16 soundbuffer[4096];
static int nsamples;
#define GPGX_EX __declspec(dllexport)
static int vwidth;
static int vheight;
static uint8_t brm_format[0x40] =
{
0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x5f,0x00,0x00,0x00,0x00,0x40,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x53,0x45,0x47,0x41,0x5f,0x43,0x44,0x5f,0x52,0x4f,0x4d,0x00,0x01,0x00,0x00,0x00,
0x52,0x41,0x4d,0x5f,0x43,0x41,0x52,0x54,0x52,0x49,0x44,0x47,0x45,0x5f,0x5f,0x5f
};
extern void zap(void);
static void update_viewport(void)
{
vwidth = bitmap.viewport.w + (bitmap.viewport.x * 2);
vheight = bitmap.viewport.h + (bitmap.viewport.y * 2);
if (config.ntsc)
{
if (reg[12] & 1)
vwidth = MD_NTSC_OUT_WIDTH(vwidth);
else
vwidth = SMS_NTSC_OUT_WIDTH(vwidth);
}
if (config.render && interlaced)
{
vheight = vheight * 2;
}
}
GPGX_EX void gpgx_get_video(int *w, int *h, int *pitch, void **buffer)
{
if (w)
*w = vwidth;
if (h)
*h = vheight;
if (pitch)
*pitch = bitmap.pitch;
if (buffer)
*buffer = bitmap.data;
}
GPGX_EX void gpgx_get_audio(int *n, void **buffer)
{
if (n)
*n = nsamples;
if (buffer)
*buffer = soundbuffer;
}
// this is most certainly wrong for interlacing
GPGX_EX void gpgx_get_fps(int *num, int *den)
{
if (vdp_pal)
{
if (num)
*num = 53203424;
if (den)
*den = 3420 * 313;
}
else
{
if (num)
*num = 53693175;
if (den)
*den = 3420 * 262;
}
}
GPGX_EX int gpgx_state_size(void)
{
return STATE_SIZE;
}
GPGX_EX int gpgx_state_save(void *dest, int size)
{
if (size != STATE_SIZE)
return 0;
return !!state_save((unsigned char*) dest);
}
GPGX_EX int gpgx_state_load(void *src, int size)
{
if (size != STATE_SIZE)
return 0;
if (state_load((unsigned char *) src))
{
update_viewport();
return 1;
}
else
return 0;
}
void osd_input_update(void)
{
}
void (*input_callback_cb)(void);
void real_input_callback(void)
{
if (input_callback_cb)
input_callback_cb();
}
GPGX_EX void gpgx_set_input_callback(void (*fecb)(void))
{
input_callback_cb = fecb;
}
int (*load_archive_cb)(const char *filename, unsigned char *buffer, int maxsize);
// return 0 on failure, else actual loaded size
// extension, if not null, should be populated with the extension of the file loaded
// (up to 3 chars and null terminator, no more)
int load_archive(const char *filename, unsigned char *buffer, int maxsize, char *extension)
{
if (extension)
memcpy(extension, romextension, 4);
return load_archive_cb(filename, buffer, maxsize);
}
GPGX_EX int gpgx_get_control(t_input *dest, int bytes)
{
if (bytes != sizeof(t_input))
return 0;
memcpy(dest, &input, sizeof(t_input));
return 1;
}
GPGX_EX int gpgx_put_control(t_input *src, int bytes)
{
if (bytes != sizeof(t_input))
return 0;
memcpy(&input, src, sizeof(t_input));
return 1;
}
GPGX_EX void gpgx_advance(void)
{
if (system_hw == SYSTEM_MCD)
system_frame_scd(0);
else if ((system_hw & SYSTEM_PBC) == SYSTEM_MD)
system_frame_gen(0);
else
system_frame_sms(0);
if (bitmap.viewport.changed & 1)
{
bitmap.viewport.changed &= ~1;
update_viewport();
}
nsamples = audio_update(soundbuffer);
}
GPGX_EX void gpgx_clear_sram(void)
{
// clear sram
if (sram.on)
memset(sram.sram, 0xff, 0x10000);
if (cdd.loaded)
{
// clear and format bram
memset(scd.bram, 0, 0x2000);
brm_format[0x10] = brm_format[0x12] = brm_format[0x14] = brm_format[0x16] = 0x00;
brm_format[0x11] = brm_format[0x13] = brm_format[0x15] = brm_format[0x17] = (sizeof(scd.bram) / 64) - 3;
memcpy(scd.bram + 0x2000 - 0x40, brm_format, 0x40);
if (scd.cartridge.id)
{
// clear and format ebram
memset(scd.cartridge.area, 0x00, scd.cartridge.mask + 1);
brm_format[0x10] = brm_format[0x12] = brm_format[0x14] = brm_format[0x16] = (((scd.cartridge.mask + 1) / 64) - 3) >> 8;
brm_format[0x11] = brm_format[0x13] = brm_format[0x15] = brm_format[0x17] = (((scd.cartridge.mask + 1) / 64) - 3) & 0xff;
memcpy(scd.cartridge.area + scd.cartridge.mask + 1 - 0x40, brm_format, 0x40);
}
}
}
// a bit hacky:
// in order to present a single memory block to the frontend,
// we copy the bram bits next to the ebram bits
GPGX_EX void gpgx_sram_prepread(void)
{
if (!sram.on && cdd.loaded && scd.cartridge.id)
{
void *dest = scd.cartridge.area + scd.cartridge.mask + 1;
memcpy(dest, scd.bram, 0x2000);
}
}
GPGX_EX void gpgx_sram_commitwrite(void)
{
if (!sram.on && cdd.loaded && scd.cartridge.id)
{
void *src = scd.cartridge.area + scd.cartridge.mask + 1;
memcpy(scd.bram, src, 0x2000);
}
}
GPGX_EX const char* gpgx_get_memdom(int which, void **area, int *size)
{
if (!area || !size)
return NULL;
switch (which)
{
case 0:
*area = work_ram;
*size = 0x10000;
return "68K RAM";
case 1:
*area = zram;
*size = 0x2000;
return "Z80 RAM";
case 2:
if (!cdd.loaded)
{
*area = ext.md_cart.rom;
*size = ext.md_cart.romsize;
return "MD CART";
}
else if (scd.cartridge.id)
{
*area = scd.cartridge.area;
*size = scd.cartridge.mask + 1;
return "EBRAM";
}
else return NULL;
case 3:
if (cdd.loaded)
{
*area = scd.bootrom;
*size = 0x20000;
return "CD BOOT ROM";
}
else return NULL;
case 4:
if (cdd.loaded)
{
*area = scd.prg_ram;
*size = 0x80000;
return "CD PRG RAM";
}
else return NULL;
case 5:
if (cdd.loaded)
{
*area = scd.word_ram[0];
*size = 0x20000;
return "CD WORD RAM[0] (1M)";
}
else return NULL;
case 6:
if (cdd.loaded)
{
*area = scd.word_ram[1];
*size = 0x20000;
return "CD WORD RAM[1] (1M)";
}
else return NULL;
case 7:
if (cdd.loaded)
{
*area = scd.word_ram_2M;
*size = 0x40000;
return "CD WORD RAM (2M)";
}
else return NULL;
case 8:
if (cdd.loaded)
{
*area = scd.bram;
*size = 0x2000;
return "CD BRAM";
}
else return NULL;
case 9:
*area = boot_rom;
*size = 0x800;
return "BOOT ROM";
default:
return NULL;
case 10:
if (sram.on)
{
*area = sram.sram;
*size = 0x10000;
return "SRAM";
}
else return NULL;
case 11:
*area = cram;
*size = 128;
return "CRAM";
case 12:
*area = vsram;
*size = 128;
return "VSRAM";
case 13:
*area = vram;
*size = 65536;
return "VRAM";
}
}
GPGX_EX void gpgx_get_sram(void **area, int *size)
{
if (!area || !size)
return;
if (sram.on)
{
*area = sram.sram;
*size = 0x10000;
}
else if (scd.cartridge.id)
{
*area = scd.cartridge.area;
*size = scd.cartridge.mask + 1 + 0x2000;
}
else if (cdd.loaded)
{
*area = scd.bram;
*size = 0x2000;
}
else
{
if (area)
*area = NULL;
if (size)
*size = 0;
}
}
GPGX_EX int gpgx_init(const char *feromextension, int (*feload_archive_cb)(const char *filename, unsigned char *buffer, int maxsize), int sixbutton, char system_a, char system_b, int region)
{
zap();
memset(&bitmap, 0, sizeof(bitmap));
memset(bitmap_data_, 0, sizeof(bitmap_data_));
strncpy(romextension, feromextension, 3);
romextension[3] = 0;
load_archive_cb = feload_archive_cb;
bitmap.width = 1024;
bitmap.height = 512;
bitmap.pitch = 1024 * 4;
bitmap.data = (uint8_t *)bitmap_data_;
/* sound options */
config.psg_preamp = 150;
config.fm_preamp= 100;
config.hq_fm = 1; /* high-quality resampling */
config.psgBoostNoise = 1;
config.filter= 0; /* no filter */
config.lp_range = 0x9999; /* 0.6 in 16.16 fixed point */
config.low_freq = 880;
config.high_freq= 5000;
config.lg = 1.0;
config.mg = 1.0;
config.hg = 1.0;
config.dac_bits = 14; /* MAX DEPTH */
config.ym2413= 2; /* AUTO */
config.mono = 0; /* STEREO output */
/* system options */
config.system = 0; /* AUTO */
config.region_detect = region; // see loadrom.c
config.vdp_mode = 0; /* AUTO */
config.master_clock= 0; /* AUTO */
config.force_dtack = 0;
config.addr_error = 1;
config.bios = 0;
config.lock_on = 0;
/* video options */
config.overscan = 0;
config.gg_extra = 0;
config.ntsc = 0;
config.render= 0;
// set overall input system type
// usual is MD GAMEPAD or NONE
// TEAMPLAYER, WAYPLAY, ACTIVATOR, XEA1P, MOUSE need to be specified
// everything else is auto or master system only
// XEA1P is port 1 only
// WAYPLAY is both ports at same time only
input.system[0] = system_a;
input.system[1] = system_b;
// apparently, the only part of config.input used is the padtype identifier,
// and that's used only for choosing pad type when system_md
{
int i;
for (i = 0; i < MAX_INPUTS; i++)
config.input[i].padtype = sixbutton ? DEVICE_PAD6B : DEVICE_PAD3B;
}
if (!load_rom("PRIMARY_ROM"))
return 0;
audio_init(44100, 0);
system_init();
system_reset();
update_viewport();
gpgx_clear_sram();
return 1;
}
GPGX_EX void gpgx_reset(int hard)
{
if (hard)
system_reset();
else
gen_reset(0);
}
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