SCI32: Emulate MGDX ego view metadata

5 files changed, 60 insertions, 11 deletions

diff --git a/engines/sci/engine/file.cpp b/engines/sci/engine/file.cpp
index be3fb332ac..717efcb404 100644
--- a/engines/sci/engine/file.cpp
+++ b/engines/sci/engine/file.cpp
@@ -335,7 +335,11 @@ bool fillSavegameDesc(const Common::String &filename, SavegameDesc *desc) {
 	desc->time = meta.saveTime;
 	desc->version = meta.version;
 	desc->gameVersion = meta.gameVersion;
-	desc->score = meta.score;
+	if (g_sci->getGameId() == GID_SHIVERS) {
+		desc->score = meta.score;
+	} else if (g_sci->getGameId() == GID_MOTHERGOOSEHIRES) {
+		desc->avatarId = meta.avatarId;
+	}
 
 	if (meta.name.lastChar() == '\n')
 		meta.name.deleteLastChar();
diff --git a/engines/sci/engine/file.h b/engines/sci/engine/file.h
index b960058346..7d2461fd7a 100644
--- a/engines/sci/engine/file.h
+++ b/engines/sci/engine/file.h
@@ -65,8 +65,12 @@ struct SavegameDesc {
 	char name[SCI_MAX_SAVENAME_LENGTH];
 	Common::String gameVersion;
 #ifdef ENABLE_SCI32
-	// Used by Shivers 1
-	uint32 score;
+	union {
+		// Used by Shivers 1
+		uint32 score;
+		// Used by MGDX
+		uint8 avatarId;
+	};
 #endif
 };
 
diff --git a/engines/sci/engine/kfile.cpp b/engines/sci/engine/kfile.cpp
index 596ff5e65a..e983922024 100644
--- a/engines/sci/engine/kfile.cpp
+++ b/engines/sci/engine/kfile.cpp
@@ -308,9 +308,9 @@ reg_t kFileIOOpen(EngineState *s, int argc, reg_t *argv) {
 		unwrapFilename = false;
 	}
 
-	// Shivers stores the name and score of save games in separate %d.SG files,
-	// which are used by the save/load screen
 	if (g_sci->getGameId() == GID_SHIVERS && name.hasSuffix(".SG")) {
+		// Shivers stores the name and score of save games in separate %d.SG
+		// files, which are used by the save/load screen
 		if (mode == _K_FILE_MODE_OPEN_OR_CREATE || mode == _K_FILE_MODE_CREATE) {
 			// Suppress creation of the SG file, since it is not necessary
 			debugC(kDebugLevelFile, "Not creating unused file %s", name.c_str());
@@ -350,9 +350,41 @@ reg_t kFileIOOpen(EngineState *s, int argc, reg_t *argv) {
 
 			return make_reg(0, handle);
 		}
-	}
+	} else if (g_sci->getGameId() == GID_MOTHERGOOSEHIRES && name.hasSuffix(".DTA")) {
+		// MGDX stores the name and avatar ID in separate %d.DTA files, which
+		// are used by the save/load screen
+		if (mode == _K_FILE_MODE_OPEN_OR_CREATE || mode == _K_FILE_MODE_CREATE) {
+			// Suppress creation of the DTA file, since it is not necessary
+			debugC(kDebugLevelFile, "Not creating unused file %s", name.c_str());
+			return SIGNAL_REG;
+		} else if (mode == _K_FILE_MODE_OPEN_OR_FAIL) {
+			// Create a virtual file containing the save game description
+			// and slot number, as the game scripts expect.
+			int saveNo;
+			sscanf(name.c_str(), "%d.DTA", &saveNo);
+			saveNo += kSaveIdShift;
+
+			SavegameDesc save;
+			fillSavegameDesc(g_sci->getSavegameName(saveNo), &save);
+
+			const Common::String avatarId = Common::String::format("%02d", save.avatarId);
+			const uint nameLength = strlen(save.name);
+			const uint size = nameLength + /* \r\n */ 2 + avatarId.size() + 1;
+			char *buffer = (char *)malloc(size);
+			memcpy(buffer, save.name, nameLength);
+			buffer[nameLength] = '\r';
+			buffer[nameLength + 1] = '\n';
+			memcpy(buffer + nameLength + 2, avatarId.c_str(), avatarId.size() + 1);
+
+			const uint handle = findFreeFileHandle(s);
 
-	if (g_sci->getGameId() == GID_KQ7) {
+			s->_fileHandles[handle]._in = new Common::MemoryReadStream((byte *)buffer, size, DisposeAfterUse::YES);
+			s->_fileHandles[handle]._out = nullptr;
+			s->_fileHandles[handle]._name = "";
+
+			return make_reg(0, handle);
+		}
+	} else if (g_sci->getGameId() == GID_KQ7) {
 		// KQ7 creates a temp.tmp file to perform an atomic rewrite of the
 		// catalogue, but since we do not create catalogues for most SCI32
 		// games, ignore the write
diff --git a/engines/sci/engine/savegame.cpp b/engines/sci/engine/savegame.cpp
index 74493fcfde..aee11ef998 100644
--- a/engines/sci/engine/savegame.cpp
+++ b/engines/sci/engine/savegame.cpp
@@ -331,11 +331,16 @@ static void sync_SavegameMetadata(Common::Serializer &s, SavegameMetadata &obj)
 		s.syncAsUint32LE(obj.playTime);
 	}
 
+	// Some games require additional metadata to display the load screen
+	// correctly
 	if (s.getVersion() >= 38) {
 		if (s.isSaving()) {
-			obj.score = g_sci->getEngineState()->variables[VAR_GLOBAL][kScore].toUint16();
+			const reg_t *globals = g_sci->getEngineState()->variables[VAR_GLOBAL];
 			if (g_sci->getGameId() == GID_SHIVERS) {
-				obj.score |= g_sci->getEngineState()->variables[VAR_GLOBAL][kShivers1Score].toUint16() << 16;
+				obj.score = globals[kScore].toUint16();
+				obj.score |= globals[kShivers1Score].toUint16() << 16;
+			} else if (g_sci->getGameId() == GID_MOTHERGOOSEHIRES) {
+				obj.avatarId = readSelectorValue(g_sci->getEngineState()->_segMan, globals[kEgo], SELECTOR(view));
 			}
 		}
 
diff --git a/engines/sci/engine/savegame.h b/engines/sci/engine/savegame.h
index 01f92ed342..627fc64118 100644
--- a/engines/sci/engine/savegame.h
+++ b/engines/sci/engine/savegame.h
@@ -78,8 +78,12 @@ struct SavegameMetadata {
 	uint16 gameObjectOffset;
 	uint16 script0Size;
 #ifdef ENABLE_SCI32
-	// Used by Shivers 1
-	uint32 score;
+	union {
+		// Used by Shivers 1
+		uint32 score;
+		// Used by MGDX
+		uint8 avatarId;
+	};
 #endif
 };