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fceux
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Small save/load state speedup, noticeable only in TAS Editor or lua bots

This commit is contained in:
ansstuff 2012-02-25 23:55:35 +00:00
parent d659fab541
commit e1950ba025
2 changed files with 37 additions and 28 deletions
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5
src/emufile.h
View File

@ -247,6 +247,11 @@ public:
virtual void fflush() {}
void set_len(s32 length)
{
len = length;
if(pos>length) pos=length;
}
void trim()
{
vec->resize(len);

58
src/state.cpp
View File

@ -82,6 +82,11 @@ bool internalSaveLoad = false;
bool backupSavestates = true;
bool compressSavestates = true; //By default FCEUX compresses savestates when a movie is inactive.
// a temp memory stream. We'll be dumping some data here and then compress
EMUFILE_MEMORY memory_savestate;
// temporary buffer for compressed data of a savestate
std::vector<uint8> compressed_buf;
#define SFMDATA_SIZE (64)
static SFORMAT SFMDATA[SFMDATA_SIZE];
static int SFEXINDEX;
@ -355,11 +360,10 @@ extern int geniestage;
bool FCEUSS_SaveMS(EMUFILE* outstream, int compressionLevel)
{
//a temp memory stream. we'll dump some data here and then compress
//TODO - support dumping directly without compressing to save a buffer copy
// reset memory_savestate
memory_savestate.set_len(0);
EMUFILE_MEMORY ms;
EMUFILE* os = &ms;
EMUFILE* os = &memory_savestate;
uint32 totalsize = 0;
@ -404,7 +408,7 @@ bool FCEUSS_SaveMS(EMUFILE* outstream, int compressionLevel)
if(SPreSave) SPostSave();
//save the length of the file
int len = ms.size();
int len = memory_savestate.size();
//sanity check: len and totalsize should be the same
if(len != totalsize)
@ -414,15 +418,16 @@ bool FCEUSS_SaveMS(EMUFILE* outstream, int compressionLevel)
}
int error = Z_OK;
uint8* cbuf = (uint8*)ms.buf();
uint8* cbuf = (uint8*)memory_savestate.buf();
uLongf comprlen = -1;
if(compressionLevel != Z_NO_COMPRESSION && compressSavestates)
{
//worst case compression.
//zlib says "0.1% larger than sourceLen plus 12 bytes"
// worst case compression: zlib says "0.1% larger than sourceLen plus 12 bytes"
comprlen = (len>>9)+12 + len;
cbuf = new uint8[comprlen];
error = compress2(cbuf,&comprlen,(uint8*)ms.buf(),len,compressionLevel);
if (compressed_buf.size() < comprlen) compressed_buf.resize(comprlen);
cbuf = &compressed_buf[0];
// do compression
error = compress2(cbuf, &comprlen, (uint8*)memory_savestate.buf(), len, compressionLevel);
}
//dump the header
@ -435,7 +440,6 @@ bool FCEUSS_SaveMS(EMUFILE* outstream, int compressionLevel)
outstream->fwrite((char*)header,16);
outstream->fwrite((char*)cbuf,comprlen==-1?totalsize:comprlen);
if(cbuf != (uint8*)ms.buf()) delete[] cbuf;
return error == Z_OK;
}
@ -644,30 +648,31 @@ bool FCEUSS_LoadFP(EMUFILE* is, ENUM_SSLOADPARAMS params)
int stateversion = FCEU_de32lsb(header + 8);
int comprlen = FCEU_de32lsb(header + 12);
std::vector<uint8> buf(totalsize);
// memory_savestate is global variable which already has its vector of bytes
if ((int)(memory_savestate.get_vec())->size() < totalsize)
(memory_savestate.get_vec())->resize(totalsize);
memory_savestate.set_len(totalsize);
memory_savestate.fseek(0, SEEK_SET);
//not compressed:
if(comprlen != -1)
{
//load the compressed chunk and decompress
std::vector<char> cbuf(comprlen);
is->fread((char*)&cbuf[0],comprlen);
// the savestate is compressed: read from is to compressed_buf, then decompress from compressed_buf to memory_savestate.vec
if ((int)compressed_buf.size() < comprlen) compressed_buf.resize(comprlen);
is->fread(&compressed_buf[0], comprlen);
uLongf uncomprlen = totalsize;
int error = uncompress((uint8*)&buf[0],&uncomprlen,(uint8*)&cbuf[0],comprlen);
int error = uncompress(memory_savestate.buf(), &uncomprlen, &compressed_buf[0], comprlen);
if(error != Z_OK || uncomprlen != totalsize)
return false;
//we dont need to restore the backup here because we havent messed with the emulator state yet
}
else
return false; // we dont need to restore the backup here because we havent messed with the emulator state yet
} else
{
is->fread((char*)&buf[0],totalsize);
// the savestate is not compressed: just read from is to memory_savestate.vec
is->fread(memory_savestate.buf(), totalsize);
}
FCEUMOV_PreLoad();
EMUFILE_MEMORY mstemp(&buf);
bool x = ReadStateChunks(&mstemp,totalsize)!=0;
bool x = (ReadStateChunks(&memory_savestate, totalsize) != 0);
//mbg 5/24/08 - we don't support old states, so this shouldnt matter.
//if(read_sfcpuc && stateversion<9500)
@ -682,9 +687,8 @@ bool FCEUSS_LoadFP(EMUFILE* is, ENUM_SSLOADPARAMS params)
FCEUPPU_LoadState(stateversion);
FCEUSND_LoadState(stateversion);
x=FCEUMOV_PostLoad();
}
if(!x && backup) {
} else if (backup)
{
msBackupSavestate.fseek(0,SEEK_SET);
FCEUSS_LoadFP(&msBackupSavestate,SSLOADPARAM_NOBACKUP);
}