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Libretro: Force savestates to have a constant size, to allow netplay to work properly

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This commit is contained in:
Sour 2018-01-07 17:53:58 -05:00
parent dbab7b35d9
commit 86eabc4055
1 changed files with 13 additions and 4 deletions
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17
Libretro/libretro.cpp
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@ -20,6 +20,7 @@ static retro_log_printf_t logCallback = nullptr;
static retro_environment_t retroEnv = nullptr;
static bool _hdPacksEnabled = false;
static string _mesenVersion = "";
int32_t _saveStateSize = -1;
//Include game database as an array of strings (need an automated way to generate the include file)
static vector<string> gameDb = {
@ -504,9 +505,7 @@ extern "C" {
RETRO_API size_t retro_serialize_size()
{
std::stringstream ss;
Console::SaveState(ss);
return ss.str().size() * 2;
return _saveStateSize;
}
RETRO_API bool retro_serialize(void *data, size_t size)
@ -515,7 +514,8 @@ extern "C" {
Console::SaveState(ss);
string saveStateData = ss.str();
memcpy(data, saveStateData.c_str(), saveStateData.size());
memset(data, 0, size);
memcpy(data, saveStateData.c_str(), std::min(size, saveStateData.size()));
return true;
}
@ -642,6 +642,15 @@ extern "C" {
setupPlayerButtons(3);
retroEnv(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, desc.data());
//Savestates in Mesen may change size over time
//Retroarch doesn't like this for netplay or rewinding - it requires the states to always be the exact same size
//So we need to send a large enough size to Retroarch to ensure Mesen's state will always fit within that buffer.
std::stringstream ss;
Console::SaveState(ss);
//Round up to the next 1kb multiple
_saveStateSize = ((ss.str().size() * 2) + 0x400) & ~0x3FF;
}
return result;