Core: Add option to allow preloading the entire ROM before running

CHANGES

@@ -13,6 +13,7 @@ Features:
  - Qt: German translation (by Lothar Serra Mari)
  - Savestates now contain any RTC override data
  - Command line ability to override configuration values
+ - Add option to allow preloading the entire ROM before running
 Bugfixes:
  - LR35902: Fix core never exiting with certain event patterns
  - GB Timer: Improve DIV reset behavior

include/mgba/core/core.h

@@ -151,6 +151,9 @@ struct mCore {
 struct mCore* mCoreFind(const char* path);
 bool mCoreLoadFile(struct mCore* core, const char* path);
 
+bool mCorePreloadVF(struct mCore* core, struct VFile* vf);
+bool mCorePreloadFile(struct mCore* core, const char* path);
+
 bool mCoreAutoloadSave(struct mCore* core);
 bool mCoreAutoloadPatch(struct mCore* core);
 

src/core/core.c

@@ -115,6 +115,35 @@ bool mCoreLoadFile(struct mCore* core, const char* path) {
 	return ret;
 }
 
+bool mCorePreloadVF(struct mCore* core, struct VFile* vf) {
+	struct VFile* vfm = VFileMemChunk(NULL, vf->size(vf));
+	uint8_t buffer[2048];
+	ssize_t read;
+	vf->seek(vf, 0, SEEK_SET);
+	while ((read = vf->read(vf, buffer, sizeof(buffer))) > 0) {
+		vfm->write(vfm, buffer, read);
+	}
+	vf->close(vf);
+	bool ret = core->loadROM(core, vfm);
+	if (!ret) {
+		vfm->close(vfm);
+	}
+	return ret;
+}
+
+bool mCorePreloadFile(struct mCore* core, const char* path) {
+	struct VFile* rom = mDirectorySetOpenPath(&core->dirs, path, core->isROM);
+	if (!rom) {
+		return false;
+	}
+
+	bool ret = mCorePreloadVF(core, rom);
+	if (!ret) {
+		rom->close(rom);
+	}
+	return ret;
+}
+
 bool mCoreAutoloadSave(struct mCore* core) {
 	return core->loadSave(core, mDirectorySetOpenSuffix(&core->dirs, core->dirs.save, ".sav", O_CREAT | O_RDWR));
 }

src/platform/qt/GameController.cpp

@@ -69,6 +69,7 @@ GameController::GameController(QObject* parent)
 	, m_backupSaveState(nullptr)
 	, m_saveStateFlags(SAVESTATE_SCREENSHOT | SAVESTATE_SAVEDATA | SAVESTATE_CHEATS | SAVESTATE_RTC)
 	, m_loadStateFlags(SAVESTATE_SCREENSHOT | SAVESTATE_RTC)
+	, m_preload(false)
 	, m_override(nullptr)
 {
 #ifdef M_CORE_GBA
@@ -458,11 +459,20 @@ void GameController::openGame(bool biosOnly) {
 	QByteArray bytes;
 	if (!biosOnly) {
 		bytes = m_fname.toUtf8();
-		if (m_vf) {
-			m_threadContext.core->loadROM(m_threadContext.core, m_vf);
+		if (m_preload) {
+			if (m_vf) {
+				mCorePreloadVF(m_threadContext.core, m_vf);
+			} else {
+				mCorePreloadFile(m_threadContext.core, bytes.constData());
+				mDirectorySetDetachBase(&m_threadContext.core->dirs);
+			}
 		} else {
-			mCoreLoadFile(m_threadContext.core, bytes.constData());
-			mDirectorySetDetachBase(&m_threadContext.core->dirs);
+			if (m_vf) {
+				m_threadContext.core->loadROM(m_threadContext.core, m_vf);
+			} else {
+				mCoreLoadFile(m_threadContext.core, bytes.constData());
+				mDirectorySetDetachBase(&m_threadContext.core->dirs);
+			}
 		}
 	} else {
 		bytes = m_bios.toUtf8();
@@ -1107,6 +1117,10 @@ void GameController::setLoadStateExtdata(int flags) {
 	m_loadStateFlags = flags;
 }
 
+void GameController::setPreload(bool preload) {
+	m_preload = preload;
+}
+
 void GameController::setLuminanceValue(uint8_t value) {
 	m_luxValue = value;
 	value = std::max<int>(value - 0x16, 0);

src/platform/qt/GameController.h

@@ -154,6 +154,7 @@ public slots:
 	void reloadAudioDriver();
 	void setSaveStateExtdata(int flags);
 	void setLoadStateExtdata(int flags);
+	void setPreload(bool);
 
 #ifdef USE_PNG
 	void screenshot();
@@ -234,6 +235,8 @@ private:
 	int m_saveStateFlags;
 	int m_loadStateFlags;
 
+	bool m_preload;
+
 	InputController* m_inputController;
 	MultiplayerController* m_multiplayer;
 

src/platform/qt/SettingsView.cpp

@@ -204,6 +204,7 @@ void SettingsView::updateConfig() {
 	saveSetting("screenshotPath", m_ui.screenshotPath);
 	saveSetting("patchPath", m_ui.patchPath);
 	saveSetting("showLibrary", m_ui.showLibrary);
+	saveSetting("preload", m_ui.preload);
 
 	if (m_ui.fastForwardUnbounded->isChecked()) {
 		saveSetting("fastForwardRatio", "-1");
@@ -283,6 +284,7 @@ void SettingsView::reloadConfig() {
 	loadSetting("screenshotPath", m_ui.screenshotPath);
 	loadSetting("patchPath", m_ui.patchPath);
 	loadSetting("showLibrary", m_ui.showLibrary);
+	loadSetting("preload", m_ui.preload);
 
 	double fastForwardRatio = loadSetting("fastForwardRatio").toDouble();
 	if (fastForwardRatio <= 0) {

src/platform/qt/SettingsView.ui

@@ -568,21 +568,21 @@
          </item>
         </widget>
        </item>
-       <item row="7" column="0" colspan="2">
+       <item row="8" column="0" colspan="2">
         <widget class="Line" name="line_2">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
          </property>
         </widget>
        </item>
-       <item row="8" column="0">
+       <item row="9" column="0">
         <widget class="QLabel" name="label_24">
          <property name="text">
           <string>Savestate extra data:</string>
          </property>
         </widget>
        </item>
-       <item row="8" column="1">
+       <item row="9" column="1">
         <widget class="QCheckBox" name="saveStateScreenshot">
          <property name="text">
           <string>Screenshot</string>
@@ -592,7 +592,7 @@
          </property>
         </widget>
        </item>
-       <item row="9" column="1">
+       <item row="10" column="1">
         <widget class="QCheckBox" name="saveStateSave">
          <property name="text">
           <string>Save data</string>
@@ -602,7 +602,7 @@
          </property>
         </widget>
        </item>
-       <item row="10" column="1">
+       <item row="11" column="1">
         <widget class="QCheckBox" name="saveStateCheats">
          <property name="text">
           <string>Cheat codes</string>
@@ -612,14 +612,14 @@
          </property>
         </widget>
        </item>
-       <item row="12" column="0">
+       <item row="13" column="0">
         <widget class="QLabel" name="label_25">
          <property name="text">
           <string>Load extra data:</string>
          </property>
         </widget>
        </item>
-       <item row="12" column="1">
+       <item row="13" column="1">
         <widget class="QCheckBox" name="loadStateScreenshot">
          <property name="text">
           <string>Screenshot</string>
@@ -629,21 +629,21 @@
          </property>
         </widget>
        </item>
-       <item row="13" column="1">
+       <item row="14" column="1">
         <widget class="QCheckBox" name="loadStateSave">
          <property name="text">
           <string>Save data</string>
          </property>
         </widget>
        </item>
-       <item row="14" column="1">
+       <item row="15" column="1">
         <widget class="QCheckBox" name="loadStateCheats">
          <property name="text">
           <string>Cheat codes</string>
          </property>
         </widget>
        </item>
-       <item row="11" column="0" colspan="2">
+       <item row="12" column="0" colspan="2">
         <widget class="Line" name="line_9">
          <property name="orientation">
           <enum>Qt::Horizontal</enum>
@@ -660,6 +660,13 @@
          </property>
         </widget>
        </item>
+       <item row="7" column="1">
+        <widget class="QCheckBox" name="preload">
+         <property name="text">
+          <string>Preload entire ROM into memory</string>
+         </property>
+        </widget>
+       </item>
       </layout>
      </widget>
      <widget class="QWidget" name="bios">

src/platform/qt/Window.cpp

@@ -1476,6 +1476,12 @@ void Window::setupMenu(QMenuBar* menubar) {
 		m_controller->setLoadStateExtdata(value.toInt());
 	}, this);
 
+	ConfigOption* preload = m_config->addOption("preload");
+	preload->connect([this](const QVariant& value) {
+		m_controller->setPreload(value.toBool());
+	}, this);
+	m_config->updateOption("preload");
+
 	QAction* exitFullScreen = new QAction(tr("Exit fullscreen"), frameMenu);
 	connect(exitFullScreen, SIGNAL(triggered()), this, SLOT(exitFullScreen()));
 	exitFullScreen->setShortcut(QKeySequence("Esc"));