Working on game state

src/dialogue/DialogueRuntime.cpp

@@ -364,4 +364,46 @@ void DialogueRuntime::presentChoices(const Node& node) {
 	presentation.cutsceneBlackAlpha = 0.0f;
 }
 
+void DialogueRuntime::save(nlohmann::json& out) const
+{
+	if (!isActive() || !activeDialogue) {
+		out["active"] = false;
+		return;
+	}
+	out["active"]        = true;
+	out["dialogueId"]    = activeDialogue->id;
+	out["currentNodeId"] = currentNodeId;
+}
+
+void DialogueRuntime::load(const nlohmann::json& in)
+{
+	stop();
+	if (!in.value("active", false)) return;
+
+	const std::string dialogueId = in.value("dialogueId",    "");
+	const std::string nodeId     = in.value("currentNodeId", "");
+	if (dialogueId.empty() || nodeId.empty() || !database) return;
+
+	const DialogueDefinition* dialogue = database->findDialogue(dialogueId);
+	if (!dialogue) {
+		std::cerr << "[dialogue] load: dialogue '" << dialogueId << "' not found\n";
+		return;
+	}
+
+	activeDialogue   = dialogue;
+	currentNodeId.clear();
+	visibleChoices.clear();
+	selectedChoice   = -1;
+	revealCharacters = 0.0f;
+	presentation     = {};
+	presentation.dialogueId = dialogue->id;
+
+	enterNode(nodeId);
+
+	// Snap text to fully revealed so the typing animation doesn't replay.
+	presentation.visibleText    = presentation.fullText;
+	presentation.revealCompleted = true;
+	revealCharacters = static_cast<float>(presentation.fullText.size());
+}
+
 } // namespace ZL::Dialogue

src/dialogue/DialogueRuntime.h

@@ -2,6 +2,7 @@
 
 #include "dialogue/DialogueDatabase.h"
 #include "quest/QuestJournal.h"
+#include "external/nlohmann/json.hpp"
 #include <functional>
 #include <string>
 #include <unordered_map>
@@ -40,6 +41,13 @@ public:
 	void setGlobalFlagStore(std::unordered_map<std::string, int>* store);
 	void setQuestJournal(Quest::QuestJournal* journal);
 
+	// Saves whether a dialogue is active, its id, and current node.
+	// Cutscene state is not saved.
+	void save(nlohmann::json& out) const;
+	// Restores saved dialogue state. Text reveal snaps to completion so the
+	// typing animation doesn't replay. No callbacks are fired on restore.
+	void load(const nlohmann::json& in);
+
 private:
 	enum class Mode {
 		Inactive,

src/dialogue/DialogueSystem.h

@@ -1,5 +1,6 @@
 #pragma once
 
+#include "external/nlohmann/json.hpp"
 #include "dialogue/DialogueOverlay.h"
 #include "dialogue/DialogueRuntime.h"
 #include "cutscene/CutsceneDatabase.h"
@@ -41,6 +42,9 @@ public:
 	void setOnDialogueAdvanced(std::function<void()> cb);
 	void stopDialogue();
 
+	void saveDialogueState(nlohmann::json& out) const { dialogueRuntime.save(out); }
+	void loadDialogueState(const nlohmann::json& in)  { dialogueRuntime.load(in); }
+
 	bool isActive() const { return dialogueRuntime.isActive() || cutsceneRuntime.isActive(); }
 	bool blocksGameplayInput() const { return isActive(); }