Move global item collected-state, deadzone, and story flags into save file

Adds three new pieces of save-file state, all following the same shape:
the save file is the single source of truth, not a separate live runtime
copy that gets synced in/out.

- globalitemstore.h/.c: per-global-entity-ID "collected" flags
  (savefile_t.globalItemCollected), so a global item entity's init
  callback can check whether it was already picked up in a prior session
  without needing to keep the entity itself alive to remember that.

- Gamepad deadzone: removed input_t.deadzone entirely. The setting UI and
  every platform's actual deadzone-applying code (inputGetDeadzoneDolphin/
  SDL2, previously hardcoded per-platform literals that the settings menu
  didn't actually affect) now read savefile_t.deadzone directly via
  saveGet(SAVE_ACTIVE_SLOT). Default lives in savefile.h
  (SAVE_DEADZONE_DEFAULT), stamped onto every slot in saveInit().

- Story flags: STORY_FLAG_VALUES (a live, codegen-initialized array) is
  replaced by savefile_t.storyFlags, read/written via the existing
  storyFlagGet()/storyFlagSet() call sites (now macros/functions over the
  active save file instead of a separate array). tools/story.py now
  generates STORY_FLAG_DEFAULTS (const) instead; storyFlagInitDefaults()
  stamps those onto a save the first time it's used (file->exists false),
  called from rpgInit().

Added SAVE_ACTIVE_SLOT (0) to savefile.h as the one shared "which slot is
actually being played" constant, replacing three different local/implicit
0s (uigamemenu.c, rpg.c, and now the settings/input call sites).

Verified round-trip on Linux (all three together in one save/load cycle);
both Linux and PSP build clean.

src/dusk/input/input.c

@@ -17,7 +17,6 @@ input_t INPUT;
 
 errorret_t inputInit(void) {
   memoryZero(&INPUT, sizeof(input_t));
-  INPUT.deadzone = INPUT_DEADZONE_DEFAULT;
 
   for(uint8_t i = 0; i < INPUT_ACTION_COUNT; i++) {
     INPUT.actions[i].action = (inputaction_t)i;

src/dusk/input/input.h

@@ -12,15 +12,11 @@
 
 #define INPUT_LISTENER_PRESSED_MAX 16
 #define INPUT_LISTENER_RELEASED_MAX INPUT_LISTENER_PRESSED_MAX
-#define INPUT_DEADZONE_DEFAULT 0.1f
 
 typedef struct {
   inputactiondata_t actions[INPUT_ACTION_COUNT];
 
   inputplatform_t platform;
-
-  /** User-configured gamepad axis deadzone (0.0f to 1.0f). */
-  float_t deadzone;
 } input_t;
 
 extern input_t INPUT;

src/dusk/rpg/entity/global/CMakeLists.txt

@@ -6,4 +6,5 @@
 # Sources
 target_sources(${DUSK_LIBRARY_TARGET_NAME}
   PUBLIC
+    globalitemstore.c
 )

src/dusk/rpg/entity/global/globalitemstore.c

@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "globalitemstore.h"
+#include "assert/assert.h"
+
+bool_t globalItemStoreIsCollected(
+  const savefile_t *file, const entityglobalid_t id
+) {
+  assertNotNull(file, "Save file cannot be NULL");
+  assertTrue(id < SAVE_GLOBAL_ITEM_COUNT_MAX, "Global item ID out of range");
+  return file->globalItemCollected[id];
+}
+
+void globalItemStoreSetCollected(
+  savefile_t *file, const entityglobalid_t id, const bool_t collected
+) {
+  assertNotNull(file, "Save file cannot be NULL");
+  assertTrue(id < SAVE_GLOBAL_ITEM_COUNT_MAX, "Global item ID out of range");
+  file->globalItemCollected[id] = collected;
+}

src/dusk/rpg/entity/global/globalitemstore.h

@@ -0,0 +1,40 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+#include "save/savefile.h"
+#include "rpg/entity/entity.h"
+
+/**
+ * Checks whether the global entity with the given ID has already been
+ * marked collected in the given save file's data - e.g. so a global item
+ * entity's init callback (see rpg/entity/global/entitygloballist.h) can
+ * skip spawning itself if the player already picked it up in a prior
+ * session, without needing to keep the entity itself alive to remember
+ * that (which would need render/collision special-casing - this doesn't).
+ *
+ * @param file The save file to check.
+ * @param id The global entity ID to check.
+ * @return True if already marked collected.
+ */
+bool_t globalItemStoreIsCollected(
+  const savefile_t *file, const entityglobalid_t id
+);
+
+/**
+ * Marks the global entity with the given ID as collected (or not) in the
+ * given save file's data. Does not itself write the save to disk - call
+ * saveWrite() separately once ready to persist it.
+ *
+ * @param file The save file to write into.
+ * @param id The global entity ID to mark.
+ * @param collected The new collected state.
+ */
+void globalItemStoreSetCollected(
+  savefile_t *file, const entityglobalid_t id, const bool_t collected
+);

src/dusk/rpg/rpg.c

@@ -22,6 +22,7 @@
 #include "error/error.h"
 
 #include "ui/rpg/uiemoji.h"
+#include "rpg/story/storyflag.h"
 
 static void rpgTestSaveComplete(errorret_t result, void *user) {
   if(errorIsNotOk(result)) errorCatch(errorPrint(result));
@@ -31,6 +32,11 @@ errorret_t rpgInit(void) {
   memoryZero(ENTITIES, sizeof(ENTITIES));
   memoryZero(MAP_AREAS, sizeof(MAP_AREAS));
 
+  // Must run before any code reads a story flag - stamps CSV-defined
+  // defaults onto the active save slot if it's never actually been
+  // loaded from disk yet.
+  storyFlagInitDefaults(saveGet(SAVE_ACTIVE_SLOT));
+
   backpackInit();
   partyInit();
   cutsceneSystemInit();
@@ -61,9 +67,9 @@ errorret_t rpgInit(void) {
   // header/version. Remove once there's an actual name-entry flow. On PSP
   // this shows the real native save dialog every boot - expected while
   // testing that path, not something to ship as-is.
-  savefile_t *saveFile = saveGet(0);
+  savefile_t *saveFile = saveGet(SAVE_ACTIVE_SLOT);
   stringCopy(saveFile->playerName, "Dusk", SAVE_PLAYER_NAME_MAX);
-  saveWrite(0, rpgTestSaveComplete, NULL);
+  saveWrite(SAVE_ACTIVE_SLOT, rpgTestSaveComplete, NULL);
 
   // All Good!
   errorOk();

src/dusk/rpg/story/storyflag.c

@@ -10,5 +10,17 @@
 
 void storyFlagSet(const storyflag_t flag, const storyflagvalue_t value) {
   assertTrue(flag > STORY_FLAG_NULL && flag < STORY_FLAG_COUNT, "Bad Flag");
-  STORY_FLAG_VALUES[flag] = value;
+  saveGet(SAVE_ACTIVE_SLOT)->storyFlags[flag] = value;
+}
+
+void storyFlagInitDefaults(savefile_t *file) {
+  assertNotNull(file, "Save file cannot be NULL");
+  if(file->exists) return;
+  assertTrue(
+    STORY_FLAG_COUNT <= SAVE_STORY_FLAG_COUNT_MAX,
+    "Too many story flags for the save format - bump SAVE_STORY_FLAG_COUNT_MAX"
+  );
+  for(storyflag_t i = 0; i < STORY_FLAG_COUNT; i++) {
+    file->storyFlags[i] = STORY_FLAG_DEFAULTS[i];
+  }
 }

src/dusk/rpg/story/storyflag.h

@@ -7,19 +7,34 @@
 
 #pragma once
 #include "rpg/story/storyflagvalue.h"
+#include "save/save.h"
 
 /**
- * Gets the value of a story flag.
+ * Gets the value of a story flag. Reads directly from the active save
+ * file (see SAVE_ACTIVE_SLOT) - flag values have no separate live copy.
  *
  * @param flag The story flag to get.
  * @return The value of the story flag.
  */
-#define storyFlagGet(flag) (STORY_FLAG_VALUES[(flag)])
+#define storyFlagGet(flag) (saveGet(SAVE_ACTIVE_SLOT)->storyFlags[(flag)])
 
 /**
- * Sets the value of a story flag.
+ * Sets the value of a story flag, directly in the active save file (see
+ * SAVE_ACTIVE_SLOT). Does not itself write the save to disk - call
+ * saveWrite() separately once ready to persist it.
  *
  * @param flag The story flag to set.
  * @param value The value to set the story flag to.
  */
 void storyFlagSet(const storyflag_t flag, const storyflagvalue_t value);
+
+/**
+ * Stamps each story flag's CSV-defined default (STORY_FLAG_DEFAULTS) onto
+ * the given save file, but only if it hasn't actually been loaded from
+ * disk yet (file->exists is false) - otherwise leaves already-played
+ * progress alone. Call once, e.g. during rpgInit(), before any gameplay
+ * code reads a story flag.
+ *
+ * @param file The save file to stamp defaults onto.
+ */
+void storyFlagInitDefaults(savefile_t *file);

src/dusk/save/save.c

@@ -16,6 +16,13 @@ save_t SAVE;
 errorret_t saveInit(void) {
   memoryZero(&SAVE, sizeof(save_t));
 
+  // Establishes the default for a slot that hasn't actually been loaded
+  // from disk yet - saveLoad() overwrites this the moment a real file is
+  // found, so this only matters for a brand new save.
+  for(uint8_t i = 0; i < SAVE_FILE_COUNT_MAX; i++) {
+    SAVE.files[i].deadzone = SAVE_DEADZONE_DEFAULT;
+  }
+
   #ifdef saveInitPlatform
     // A missing/unreachable save medium is expected, recoverable state,
     // not a reason to fail booting the whole game - log it and carry on

src/dusk/save/savefile.h

@@ -20,9 +20,44 @@
 /** Maximum number of independent save slots supported. */
 #define SAVE_FILE_COUNT_MAX 3
 
+/**
+ * The save slot actually used for gameplay right now - there's no slot
+ * select/multi-save UX yet (SAVE_FILE_COUNT_MAX > 1 exists for later), so
+ * every part of the game that needs "the" save file (settings, the game
+ * menu's Save button, etc.) reads/writes this one slot.
+ */
+#define SAVE_ACTIVE_SLOT 0
+
 /** Maximum length of a saved player name, including the null terminator. */
 #define SAVE_PLAYER_NAME_MAX 32
 
+/**
+ * Maximum number of global entities whose "collected" state can be
+ * tracked - see rpg/entity/global/globalitemstore.h. Bounded/fixed here
+ * rather than tied to ENTITY_GLOBAL_LIST_COUNT, since savefile.h is a
+ * leaf header with no dependency on the entity system (and no reason to
+ * take one just for a size constant).
+ */
+#define SAVE_GLOBAL_ITEM_COUNT_MAX 64
+
+/**
+ * Default gamepad deadzone for a save slot that's never actually been
+ * loaded from disk yet (see saveInit(), which stamps this onto every
+ * slot up front) - defined here, rather than by the input system, since
+ * the save file is now the single source of truth for this value (see
+ * savefile_t.deadzone) - nothing else stores or defaults it.
+ */
+#define SAVE_DEADZONE_DEFAULT 0.1f
+
+/**
+ * Maximum number of story flags the save format can hold - see
+ * rpg/story/storyflag.h. Bounded/fixed here (with real headroom over the
+ * current flag count) rather than tied to STORY_FLAG_COUNT, since
+ * savefile.h is a leaf header with no dependency on generated story
+ * content, matching SAVE_GLOBAL_ITEM_COUNT_MAX's reasoning.
+ */
+#define SAVE_STORY_FLAG_COUNT_MAX 128
+
 typedef struct {
   /** Magic header bytes read from the file; must equal SAVE_FILE_HEADER. */
   char_t header[SAVE_FILE_HEADER_SIZE];
@@ -32,6 +67,20 @@ typedef struct {
   bool_t exists;
   /** The player's saved name. */
   char_t playerName[SAVE_PLAYER_NAME_MAX];
+  /** Per-global-ID "already collected" flags - see globalitemstore.h. */
+  bool_t globalItemCollected[SAVE_GLOBAL_ITEM_COUNT_MAX];
+  /**
+   * User-configured gamepad deadzone (0.0f-1.0f) - the save file is the
+   * only place this lives; read it directly via saveGet(SAVE_ACTIVE_SLOT)
+   * ->deadzone rather than caching it anywhere else.
+   */
+  float_t deadzone;
+  /**
+   * Story flag values, indexed by storyflag_t - the save file is the only
+   * place these live; read/write via storyFlagGet()/storyFlagSet() (see
+   * rpg/story/storyflag.h), not directly.
+   */
+  uint8_t storyFlags[SAVE_STORY_FLAG_COUNT_MAX];
 } savefile_t;
 
 /**

src/dusk/save/savestream.c

@@ -331,6 +331,13 @@ errorret_t saveFileLoad(savestream_t *stream, savefile_t *file) {
   saveFileReadHeader(stream, file->header);
   saveFileReadVersion(stream, &file->version);
   saveFileReadString(stream, file->playerName, SAVE_PLAYER_NAME_MAX);
+  for(size_t i = 0; i < SAVE_GLOBAL_ITEM_COUNT_MAX; i++) {
+    saveFileReadBool(stream, &file->globalItemCollected[i]);
+  }
+  saveFileReadFloat(stream, &file->deadzone);
+  for(size_t i = 0; i < SAVE_STORY_FLAG_COUNT_MAX; i++) {
+    saveFileReadUInt8(stream, &file->storyFlags[i]);
+  }
   errorOk();
 }
 
@@ -338,5 +345,12 @@ errorret_t saveFileWrite(savestream_t *stream, savefile_t *file) {
   saveFileWriteHeader(stream, file->header);
   saveFileWriteVersion(stream, &file->version);
   saveFileWriteString(stream, file->playerName, SAVE_PLAYER_NAME_MAX);
+  for(size_t i = 0; i < SAVE_GLOBAL_ITEM_COUNT_MAX; i++) {
+    saveFileWriteBool(stream, &file->globalItemCollected[i]);
+  }
+  saveFileWriteFloat(stream, &file->deadzone);
+  for(size_t i = 0; i < SAVE_STORY_FLAG_COUNT_MAX; i++) {
+    saveFileWriteUInt8(stream, &file->storyFlags[i]);
+  }
   errorOk();
 }

src/dusk/ui/frame/game/uigamemenu.c

@@ -26,10 +26,6 @@
 #define UI_GAME_MENU_INDEX_SETTINGS 2
 #define UI_GAME_MENU_INDEX_SAVE 3
 
-// Only one save slot is exposed through this menu for now - there is no
-// slot-select UI yet, and SAVE_FILE_COUNT_MAX > 1 exists for later.
-#define UI_GAME_MENU_SAVE_SLOT 0
-
 static void uiGameMenuSaveWriteComplete(errorret_t result, void *user) {
   if(errorIsNotOk(result)) {
     // Generously sized - stringFormat asserts (crashes) rather than
@@ -53,7 +49,7 @@ static void uiGameMenuSaveCreateConfirmed(const bool_t confirmed, void *user) {
     return;
   }
 
-  saveWrite(UI_GAME_MENU_SAVE_SLOT, uiGameMenuSaveWriteComplete, NULL);
+  saveWrite(SAVE_ACTIVE_SLOT, uiGameMenuSaveWriteComplete, NULL);
 }
 
 // Determines whether there's actually save data to overwrite (not just
@@ -72,8 +68,8 @@ static void uiGameMenuSaveCheckComplete(errorret_t result, void *user) {
     return;
   }
 
-  if(saveExists(UI_GAME_MENU_SAVE_SLOT)) {
+  if(saveExists(SAVE_ACTIVE_SLOT)) {
-    saveWrite(UI_GAME_MENU_SAVE_SLOT, uiGameMenuSaveWriteComplete, NULL);
+    saveWrite(SAVE_ACTIVE_SLOT, uiGameMenuSaveWriteComplete, NULL);
     return;
   }
 
@@ -91,7 +87,7 @@ static void uiGameMenuSave(void) {
   }
   if(saveIsBusy()) return;// A save/load dialog (e.g. on PSP) is already up.
 
-  saveLoad(UI_GAME_MENU_SAVE_SLOT, uiGameMenuSaveCheckComplete, NULL);
+  saveLoad(SAVE_ACTIVE_SLOT, uiGameMenuSaveCheckComplete, NULL);
 }
 
 uigamemenu_t UI_GAME_MENU;

src/dusk/ui/frame/settings/uisettingsinput.c

@@ -11,7 +11,7 @@
 #include "util/memory.h"
 #include "locale/localemanager.h"
 #include "asset/loader/locale/assetlocaleloader.h"
-#include "input/input.h"
+#include "save/save.h"
 
 void uiSettingsInputSelected(
   const uimenu_t *menu,
@@ -39,7 +39,7 @@ errorret_t uiSettingsInputInit(uisettingsdata_t *data) {
       UI_SETTINGS_INPUT_LABEL_MAX
     ));
     MENU_SLIDER_FLOAT(
-      input->deadzoneLabel, INPUT_DEADZONE_DEFAULT, 0.0f, 1.0f, 0.05f
+      input->deadzoneLabel, SAVE_DEADZONE_DEFAULT, 0.0f, 1.0f, 0.05f
     );
   #else
     MENU_LABEL("No input settings yet");
@@ -55,14 +55,14 @@ void uiSettingsInputLoad(void) {
   #ifdef DUSK_INPUT_GAMEPAD
     uiSliderSetFloat(
       &UI_SETTINGS.data.input.items[UI_SETTINGS_INPUT_INDEX_DEADZONE].slider,
-      INPUT.deadzone
+      saveGet(SAVE_ACTIVE_SLOT)->deadzone
     );
   #endif
 }
 
 void uiSettingsInputApply(void) {
   #ifdef DUSK_INPUT_GAMEPAD
-    INPUT.deadzone = uiSliderGetFloat(
+    saveGet(SAVE_ACTIVE_SLOT)->deadzone = uiSliderGetFloat(
       &UI_SETTINGS.data.input.items[UI_SETTINGS_INPUT_INDEX_DEADZONE].slider
     );
   #endif
@@ -73,7 +73,7 @@ bool_t uiSettingsInputHasChanges(void) {
   #ifdef DUSK_INPUT_GAMEPAD
     if(uiSliderGetFloat(
       &UI_SETTINGS.data.input.items[UI_SETTINGS_INPUT_INDEX_DEADZONE].slider
-    ) != INPUT.deadzone) return true;
+    ) != saveGet(SAVE_ACTIVE_SLOT)->deadzone) return true;
   #endif
 
   return false;

src/duskdolphin/input/inputdolphin.c

@@ -9,6 +9,7 @@
 #include "assert/assert.h"
 #include "log/log.h"
 #include "util/string.h"
+#include "save/save.h"
 
 inputbuttondata_t INPUT_BUTTON_DATA[] = {
   #ifdef DUSK_INPUT_GAMEPAD
@@ -187,5 +188,5 @@ float_t inputButtonGetValueDolphin(const inputbutton_t button) {
 }
 
 float_t inputGetDeadzoneDolphin(const inputbutton_t button) {
-  return 0.2f;
+  return saveGet(SAVE_ACTIVE_SLOT)->deadzone;
 }

src/dusklinux/input/inputlinux.c

@@ -6,6 +6,7 @@
  */
 
 #include "input/input.h"
+#include "save/save.h"
 
 inputbuttondata_t INPUT_BUTTON_DATA[] = {
   #ifdef DUSK_INPUT_GAMEPAD
@@ -547,5 +548,5 @@ errorret_t inputInitLinux(void) {
 }
 
 float_t inputGetDeadzoneSDL2(const inputbutton_t button) {
-  return 0.17f;
+  return saveGet(SAVE_ACTIVE_SLOT)->deadzone;
 }

src/duskpsp/input/inputpsp.c

@@ -6,6 +6,7 @@
  */
 
 #include "input/input.h"
+#include "save/save.h"
 
 // #define INPUT_PSP_GAMEPAD_BUTTON_ACCEPT INPUT_SDL2_GAMEPAD_BUTTON_CUSTOM
 // #define INPUT_PSP_GAMEPAD_BUTTON_CANCEL INPUT_SDL2_GAMEPAD_BUTTON_CUSTOM
@@ -94,5 +95,5 @@ errorret_t inputInitPSP(void) {
 }
 
 float_t inputGetDeadzoneSDL2(const inputbutton_t button) {
-  return 0.2f;
+  return saveGet(SAVE_ACTIVE_SLOT)->deadzone;
 }

src/duskvita/input/inputvita.c

@@ -6,6 +6,7 @@
  */
 
 #include "input/input.h"
+#include "save/save.h"
 
 inputbuttondata_t INPUT_BUTTON_DATA[] = {
   { .name = "triangle", {
@@ -83,5 +84,5 @@ inputbuttondata_t INPUT_BUTTON_DATA[] = {
 };
 
 float_t inputGetDeadzoneSDL2(const inputbutton_t button) {
-  return 0.17f;
+  return saveGet(SAVE_ACTIVE_SLOT)->deadzone;
 }

tools/story.py

@@ -38,7 +38,11 @@ out += [
   "  STORY_FLAG_COUNT",
   "} storyflag_t;",
   "",
-  "static storyflagvalue_t STORY_FLAG_VALUES[STORY_FLAG_COUNT] = {",
+  "// Stamped onto a save file's storyFlags the first time it's used (see",
+  "// storyFlagInitDefaults()) - not a live value array. Live flag state",
+  "// lives entirely in the save file (savefile_t.storyFlags), read/written",
+  "// via storyFlagGet()/storyFlagSet() - see storyflag.h.",
+  "static const storyflagvalue_t STORY_FLAG_DEFAULTS[STORY_FLAG_COUNT] = {",
 ]
 for flag in flags:
   out.append(f"  [{flag_enum(flag['id'])}] = {flag['initial']},")