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libretro: add savestate support

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This commit is contained in:
notaz 2013-07-31 02:18:34 +03:00
parent 989ba52a01
commit 86b38dc46d
3 changed files with 145 additions and 15 deletions
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38
pico/state.c
View file

@ -11,15 +11,11 @@
#include "../cpu/sh2/sh2.h"
#include "sound/ym2612.h"
#include "state.h"
// sn76496
extern int *sn76496_regs;
typedef size_t (arearw)(void *p, size_t _size, size_t _n, void *file);
typedef size_t (areaeof)(void *file);
typedef int (areaseek)(void *file, long offset, int whence);
typedef int (areaclose)(void *file);
static arearw *areaRead;
static arearw *areaWrite;
static areaeof *areaEof;
@ -594,15 +590,10 @@ readend:
return 0;
}
int PicoState(const char *fname, int is_save)
static int pico_state_internal(void *afile, int is_save)
{
void *afile = NULL;
int ret;
afile = open_save_file(fname, is_save);
if (afile == NULL)
return -1;
if (is_save)
ret = state_save(afile);
else {
@ -617,10 +608,35 @@ int PicoState(const char *fname, int is_save)
Pico.m.dirtyPal = 1;
}
return ret;
}
int PicoState(const char *fname, int is_save)
{
void *afile = NULL;
int ret;
afile = open_save_file(fname, is_save);
if (afile == NULL)
return -1;
ret = pico_state_internal(afile, is_save);
areaClose(afile);
return ret;
}
int PicoStateFP(void *afile, int is_save,
arearw *read, arearw *write, areaeof *eof, areaseek *seek)
{
areaRead = read;
areaWrite = write;
areaEof = eof;
areaSeek = seek;
areaClose = NULL;
return pico_state_internal(afile, is_save);
}
int PicoStateLoadGfx(const char *fname)
{
void *afile;

9
pico/state.h Normal file
View file

@ -0,0 +1,9 @@
#include <stdlib.h>
typedef size_t (arearw)(void *p, size_t _size, size_t _n, void *file);
typedef size_t (areaeof)(void *file);
typedef int (areaseek)(void *file, long offset, int whence);
typedef int (areaclose)(void *file);
int PicoStateFP(void *afile, int is_save,
arearw *read, arearw *write, areaeof *eof, areaseek *seek);

113
platform/libretro.c
View file

@ -17,6 +17,7 @@
#endif
#include <pico/pico_int.h>
#include <pico/state.h>
#include "common/input_pico.h"
#include "common/version.h"
#include "libretro.h"
@ -226,20 +227,124 @@ void retro_get_system_av_info(struct retro_system_av_info *info)
info->geometry.aspect_ratio = 4.0 / 3.0;
}
/* savestates - TODO */
/* savestates */
struct savestate_state {
const char *load_buf;
char *save_buf;
size_t size;
size_t pos;
};
size_t state_read(void *p, size_t size, size_t nmemb, void *file)
{
struct savestate_state *state = file;
size_t bsize = size * nmemb;
if (state->pos + bsize > state->size) {
lprintf("savestate error: %u/%u\n",
state->pos + bsize, state->size);
bsize = state->size - state->pos;
if ((int)bsize <= 0)
return 0;
}
memcpy(p, state->load_buf + state->pos, bsize);
state->pos += bsize;
return bsize;
}
size_t state_write(void *p, size_t size, size_t nmemb, void *file)
{
struct savestate_state *state = file;
size_t bsize = size * nmemb;
if (state->pos + bsize > state->size) {
lprintf("savestate error: %u/%u\n",
state->pos + bsize, state->size);
bsize = state->size - state->pos;
if ((int)bsize <= 0)
return 0;
}
memcpy(state->save_buf + state->pos, p, bsize);
state->pos += bsize;
return bsize;
}
size_t state_skip(void *p, size_t size, size_t nmemb, void *file)
{
struct savestate_state *state = file;
size_t bsize = size * nmemb;
state->pos += bsize;
return bsize;
}
size_t state_eof(void *file)
{
struct savestate_state *state = file;
return state->pos >= state->size;
}
int state_fseek(void *file, long offset, int whence)
{
struct savestate_state *state = file;
switch (whence) {
case SEEK_SET:
state->pos = offset;
break;
case SEEK_CUR:
state->pos += offset;
break;
case SEEK_END:
state->pos = state->size + offset;
break;
}
return (int)state->pos;
}
/* savestate sizes vary wildly depending if cd/32x or
* carthw is active, so run the whole thing to get size */
size_t retro_serialize_size(void)
{
return 0;
struct savestate_state state = { 0, };
int ret;
ret = PicoStateFP(&state, 1, NULL, state_skip, NULL, state_fseek);
if (ret != 0)
return 0;
return state.pos;
}
bool retro_serialize(void *data, size_t size)
{
return false;
struct savestate_state state = { 0, };
int ret;
state.save_buf = data;
state.size = size;
state.pos = 0;
ret = PicoStateFP(&state, 1, NULL, state_write,
NULL, state_fseek);
return ret == 0;
}
bool retro_unserialize(const void *data, size_t size)
{
return false;
struct savestate_state state = { 0, };
int ret;
state.load_buf = data;
state.size = size;
state.pos = 0;
ret = PicoStateFP(&state, 0, state_read, NULL,
state_eof, state_fseek);
return ret == 0;
}
/* cheats - TODO */