Show savegame version/info in load window if sl debug enabled

src/fios_gui.cpp

@@ -66,6 +66,7 @@ void LoadCheckData::Clear()
 	this->debug_config_data.clear();
 
 	this->sl_is_ext_version = false;
+	this->version_name.clear();
 }
 
 /** Load game/scenario with optional content download */
@@ -490,6 +491,11 @@ public:
 		tr.bottom -= FONT_HEIGHT_NORMAL - 1;
 		if (tr.top > tr.bottom) return;
 
+		if (!_load_check_data.version_name.empty()) {
+			SetDParamStr(0, _load_check_data.version_name);
+			tr.top = DrawStringMultiLine(tr, STR_JUST_RAW_STRING, TC_GREEN);
+		}
+
 		if (!_load_check_data.checkable) {
 			/* Old savegame, no information available */
 			DrawString(tr, STR_SAVELOAD_DETAIL_NOT_AVAILABLE);

src/load_check.h

@@ -48,6 +48,7 @@ struct LoadCheckData {
 	std::string debug_config_data;
 
 	bool sl_is_ext_version = false;
+	std::string version_name;
 
 	LoadCheckData() : grfconfig(nullptr),
 			grf_compatibility(GLC_NOT_FOUND)

src/sl/saveload.cpp

@@ -3478,6 +3478,8 @@ static SaveOrLoadResult DoLoad(LoadFilter *reader, bool load_check)
 	uint32 hdr[2];
 	if (_sl.lf->Read((byte*)hdr, sizeof(hdr)) != sizeof(hdr)) SlError(STR_GAME_SAVELOAD_ERROR_FILE_NOT_READABLE);
 
+	SaveLoadVersion original_sl_version = SL_MIN_VERSION;
+
 	/* see if we have any loader for this type. */
 	const SaveLoadFormat *fmt = _saveload_formats;
 	for (;;) {
@@ -3518,6 +3520,8 @@ static SaveOrLoadResult DoLoad(LoadFilter *reader, bool load_check)
 				special_version = SlXvCheckSpecialSavegameVersions();
 			}
 
+			original_sl_version = _sl_version;
+
 			if (_sl_version >= SLV_SAVELOAD_LIST_LENGTH) {
 				if (_sl_is_ext_version) {
 					DEBUG(sl, 0, "Got an extended savegame version with a base version in the upstream mode range, giving up");
@@ -3609,6 +3613,62 @@ static SaveOrLoadResult DoLoad(LoadFilter *reader, bool load_check)
 		/* The only part from AfterLoadGame() we need */
 		if (_load_check_data.want_grf_compatibility) _load_check_data.grf_compatibility = IsGoodGRFConfigList(_load_check_data.grfconfig);
 		_load_check_data.sl_is_ext_version = _sl_is_ext_version;
+
+		if (_debug_sl_level > 0) {
+			_load_check_data.version_name = stdstr_fmt("Version %d%s%s", original_sl_version, _sl_is_ext_version ? ", extended" : "", _sl_upstream_mode ? ", upstream mode" : "");
+			if (_sl_version != original_sl_version) {
+				_load_check_data.version_name += stdstr_fmt(" as %d", _sl_version);
+			}
+			if (_sl_xv_feature_versions[XSLFI_CHILLPP] >= SL_CHILLPP_232) {
+				_load_check_data.version_name += ", ChillPP v14.7";
+			} else if (_sl_xv_feature_versions[XSLFI_CHILLPP] > 0) {
+				_load_check_data.version_name += ", ChillPP v8";
+			}
+			if (_sl_xv_feature_versions[XSLFI_SPRINGPP] > 0) {
+				_load_check_data.version_name += ", SpringPP 2013 ";
+				switch (_sl_xv_feature_versions[XSLFI_SPRINGPP]) {
+					case 1:
+						_load_check_data.version_name += "v2.0.102";
+						break;
+					case 2:
+						_load_check_data.version_name += "v2.0.108";
+						break;
+					case 3:
+						_load_check_data.version_name += "v2.3.xxx"; // Note that this break in numbering is deliberate
+						break;
+					case 4:
+						_load_check_data.version_name += "v2.1.147"; // Note that this break in numbering is deliberate
+						break;
+					case 5:
+						_load_check_data.version_name += "v2.3.b3";
+						break;
+					case 6:
+						_load_check_data.version_name += "v2.3.b4";
+						break;
+					case 7:
+						_load_check_data.version_name += "v2.3.b5";
+						break;
+					case 8:
+						_load_check_data.version_name += "v2.4";
+						break;
+					default:
+						_load_check_data.version_name += "???";
+						break;
+				}
+			}
+			if (_sl_xv_feature_versions[XSLFI_JOKERPP] > 0) {
+				_load_check_data.version_name += ", JokerPP";
+			}
+
+			extern std::string _sl_xv_version_label;
+			extern SaveLoadVersion _sl_xv_upstream_version;
+			if (!_sl_xv_version_label.empty()) {
+				_load_check_data.version_name += stdstr_fmt(", labelled: %s", _sl_xv_version_label.c_str());
+			}
+			if (_sl_xv_upstream_version > 0) {
+				_load_check_data.version_name += stdstr_fmt(", upstream version: %d", _sl_xv_upstream_version);
+			}
+		}
 	} else {
 		GamelogStartAction(GLAT_LOAD);