@@ -43,6 +43,8 @@ - Qt: Spanish translation (by Kevin López)
  - Add option for whether rewinding restores save games
  - 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
@@ -118,6 +120,8 @@ - FFmpeg: Force MP4 files to YUV420P
  - Qt: Make "Mute" able to be bound to a key
  - Core: Restore sleep callback
  - Qt: Add .gb/.gbc files to the extension list in Info.plist
+ - Feature: Make -l option explicit
+ - Core: Ability to enumerate and modify video and audio channels
 
 medusa alpha 1: (2017-04-08)
 Features:

@@ -92,6 +92,8 @@ memcpy(dest->vector, src->vector, src->size * sizeof(TYPE)); \
 		dest->size = src->size; \
 	} \
 
+DECLARE_VECTOR(StringList, char*);
+
 CXX_GUARD_END
 
 #endif

@@ -48,7 +48,6 @@
 mLOG_DECLARE_CATEGORY(CHEATS);
 
 DECLARE_VECTOR(mCheatList, struct mCheat);
-DECLARE_VECTOR(StringList, char*);
 
 struct mCheatDevice;
 struct mCheatSet {

@@ -147,11 +147,19 @@ struct mCheatDevice* (*cheatDevice)(struct mCore*);
 
 	size_t (*savedataClone)(struct mCore*, void** sram);
 	bool (*savedataRestore)(struct mCore*, const void* sram, size_t size, bool writeback);
+
+	size_t (*listVideoLayers)(const struct mCore*, const struct mCoreChannelInfo**);
+	size_t (*listAudioChannels)(const struct mCore*, const struct mCoreChannelInfo**);
+	void (*enableVideoLayer)(struct mCore*, size_t id, bool enable);
+	void (*enableAudioChannel)(struct mCore*, size_t id, bool enable);
 };
 
 #if !defined(MINIMAL_CORE) || MINIMAL_CORE < 2
 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);

@@ -105,6 +105,13 @@ struct mRumble {
 	void (*setRumble)(struct mRumble*, int enable);
 };
 
+struct mCoreChannelInfo {
+	size_t id;
+	const char* internalName;
+	const char* visibleName;
+	const char* visibleType;
+};
+
 CXX_GUARD_END
 
 #endif

@@ -17,7 +17,6 @@ mLOG_DEFINE_CATEGORY(CHEATS, "Cheats", "core.cheats");
 
 DEFINE_VECTOR(mCheatList, struct mCheat);
 DEFINE_VECTOR(mCheatSets, struct mCheatSet*);
-DEFINE_VECTOR(StringList, char*);
 
 static int32_t _readMem(struct mCore* core, uint32_t address, int width) {
 	switch (width) {

@@ -122,6 +122,35 @@ }
 	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));
 }

@@ -18,6 +18,38 @@ #include <mgba-util/memory.h>
 #include <mgba-util/patch.h>
 #include <mgba-util/vfs.h>
 
+const static struct mCoreChannelInfo _DSVideoLayers[] = {
+	{ 0, "abg0", "A BG0", "2D/3D" },
+	{ 1, "abg1", "A BG1", NULL },
+	{ 2, "abg2", "A BG2", NULL },
+	{ 3, "abg3", "A BG3", NULL },
+	{ 4, "aobj", "A OBJ", NULL },
+	{ 5, "bbg0", "B BG0", "2D/3D" },
+	{ 6, "bbg1", "B BG1", NULL },
+	{ 7, "bbg2", "B BG2", NULL },
+	{ 8, "bbg3", "B BG3", NULL },
+	{ 9, "bobj", "B OBJ", NULL },
+};
+
+const static struct mCoreChannelInfo _DSAudioChannels[] = {
+	{ 0, "ch00", "Channel 0", NULL },
+	{ 1, "ch01", "Channel 1", NULL },
+	{ 2, "ch02", "Channel 2", NULL },
+	{ 3, "ch03", "Channel 3", NULL },
+	{ 4, "ch04", "Channel 4", NULL },
+	{ 5, "ch05", "Channel 5", NULL },
+	{ 6, "ch06", "Channel 6", NULL },
+	{ 7, "ch07", "Channel 7", NULL },
+	{ 8, "ch08", "Channel 8", NULL },
+	{ 9, "ch09", "Channel 9", NULL },
+	{ 10, "ch10", "Channel 10", NULL },
+	{ 11, "ch11", "Channel 11", NULL },
+	{ 12, "ch12", "Channel 12", NULL },
+	{ 13, "ch13", "Channel 13", NULL },
+	{ 14, "ch14", "Channel 14", NULL },
+	{ 15, "ch15", "Channel 15", NULL },
+};
+
 struct DSCore {
 	struct mCore d;
 	struct ARMCore* arm7;
@@ -515,6 +547,27 @@ static bool _DSCoreSavedataRestore(struct mCore* core, const void* sram, size_t size, bool writeback) {
 	return false;
 }
 
+static size_t _DSCoreListVideoLayers(const struct mCore* core, const struct mCoreChannelInfo** info) {
+	UNUSED(core);
+	*info = _DSVideoLayers;
+	return sizeof(_DSVideoLayers) / sizeof(*_DSVideoLayers);
+}
+
+static size_t _DSCoreListAudioChannels(const struct mCore* core, const struct mCoreChannelInfo** info) {
+	UNUSED(core);
+	*info = _DSAudioChannels;
+	return sizeof(_DSAudioChannels) / sizeof(*_DSAudioChannels);
+}
+
+static void _DSCoreEnableVideoLayer(struct mCore* core, size_t id, bool enable) {
+	struct DS* ds = core->board;
+	// TODO
+}
+
+static void _DSCoreEnableAudioChannel(struct mCore* core, size_t id, bool enable) {
+	struct DS* ds = core->board;
+}
+
 struct mCore* DSCoreCreate(void) {
 	struct DSCore* dscore = malloc(sizeof(*dscore));
 	struct mCore* core = &dscore->d;
@@ -584,5 +637,9 @@ #endif
 	core->cheatDevice = _DSCoreCheatDevice;
 	core->savedataClone = _DSCoreSavedataClone;
 	core->savedataRestore = _DSCoreSavedataRestore;
+	core->listVideoLayers = _DSCoreListVideoLayers;
+	core->listAudioChannels = _DSCoreListAudioChannels;
+	core->enableVideoLayer = _DSCoreEnableVideoLayer;
+	core->enableAudioChannel = _DSCoreEnableAudioChannel;
 	return core;
 }

@@ -38,6 +38,7 @@ #ifdef USE_GDB_STUB
 	{ "gdb",       no_argument, 0, 'g' },
 #endif
 	{ "help",      no_argument, 0, 'h' },
+	{ "log-level", required_argument, 0, 'l' },
 	{ "movie",     required_argument, 0, 'v' },
 	{ "patch",     required_argument, 0, 'p' },
 	{ "version",   no_argument, 0, '\0' },
@@ -47,10 +48,27 @@
 static bool _parseGraphicsArg(struct mSubParser* parser, int option, const char* arg);
 static void _applyGraphicsArgs(struct mSubParser* parser, struct mCoreConfig* config);
 
+static void _tableInsert(struct Table* table, const char* pair) {
+	char* eq = strchr(pair, '=');
+	if (eq) {
+		char option[128] = "";
+		strncpy(option, pair, eq - pair);
+		option[sizeof(option) - 1] = '\0';
+		HashTableInsert(table, option, strdup(&eq[1]));
+	} else {
+		HashTableInsert(table, pair, strdup("1"));
+	}
+}
+
+static void _tableApply(const char* key, void* value, void* user) {
+	struct mCoreConfig* config = user;
+	mCoreConfigSetOverrideValue(config, key, value);
+}
+
 bool parseArguments(struct mArguments* args, int argc, char* const* argv, struct mSubParser* subparser) {
 	int ch;
 	char options[64] =
-		"b:c:hl:p:s:v:"
+		"b:c:C:hl:p:s:v:"
 #ifdef USE_EDITLINE
 		"d"
 #endif
@@ -61,6 +79,7 @@ ;
 	memset(args, 0, sizeof(*args));
 	args->frameskip = -1;
 	args->logLevel = INT_MIN;
+	HashTableInit(&args->configOverrides, 0, free);
 	if (subparser && subparser->extraOptions) {
 		// TODO: modularize options to subparsers
 		strncat(options, subparser->extraOptions, sizeof(options) - strlen(options) - 1);
@@ -82,6 +101,9 @@ break;
 		case 'c':
 			args->cheatsFile = strdup(optarg);
 			break;
+		case 'C':
+			_tableInsert(&args->configOverrides, optarg);
+			break;
 #ifdef USE_EDITLINE
 		case 'd':
 			if (args->debuggerType != DEBUGGER_NONE) {
@@ -144,6 +166,7 @@ }
 	if (args->bios) {
 		mCoreConfigSetOverrideValue(config, "bios", args->bios);
 	}
+	HashTableEnumerate(&args->configOverrides, _tableApply, config);
 	if (subparser) {
 		subparser->apply(subparser, config);
 	}
@@ -164,6 +187,8 @@ args->cheatsFile = 0;
 
 	free(args->bios);
 	args->bios = 0;
+
+	HashTableDeinit(&args->configOverrides);
 }
 
 void initParserForGraphics(struct mSubParser* parser, struct mGraphicsOpts* opts) {
@@ -209,18 +234,20 @@
 void usage(const char* arg0, const char* extraOptions) {
 	printf("usage: %s [option ...] file\n", arg0);
 	puts("\nGeneric options:");
-	puts("  -b, --bios FILE     GBA BIOS file to use");
-	puts("  -c, --cheats FILE   Apply cheat codes from a file");
+	puts("  -b, --bios FILE            GBA BIOS file to use");
+	puts("  -c, --cheats FILE          Apply cheat codes from a file");
+	puts("  -C, --config OPTION=VALUE  Override config value");
 #ifdef USE_EDITLINE
-	puts("  -d, --debug         Use command-line debugger");
+	puts("  -d, --debug                Use command-line debugger");
 #endif
 #ifdef USE_GDB_STUB
-	puts("  -g, --gdb           Start GDB session (default port 2345)");
+	puts("  -g, --gdb                  Start GDB session (default port 2345)");
 #endif
-	puts("  -v, --movie FILE    Play back a movie of recorded input");
-	puts("  -p, --patch FILE    Apply a specified patch file when running");
-	puts("  -s, --frameskip N   Skip every N frames");
-	puts("  --version           Print version and exit");
+	puts("  -l, --log-level N          Log level mask");
+	puts("  -v, --movie FILE           Play back a movie of recorded input");
+	puts("  -p, --patch FILE           Apply a specified patch file when running");
+	puts("  -s, --frameskip N          Skip every N frames");
+	puts("  --version                  Print version and exit");
 	if (extraOptions) {
 		puts(extraOptions);
 	}

@@ -10,6 +10,8 @@ #include <mgba-util/common.h>
 
 CXX_GUARD_START
 
+#include <mgba-util/table.h>
+
 #include <mgba/internal/debugger/debugger.h>
 
 struct mArguments {
@@ -20,6 +22,8 @@ char* movie;
 	char* bios;
 	int logLevel;
 	int frameskip;
+
+	struct Table configOverrides;
 
 	enum mDebuggerType debuggerType;
 	bool debugAtStart;

@@ -25,6 +25,19 @@ #ifndef MINIMAL_CORE
 #include <mgba/internal/gba/input.h>
 #endif
 
+const static struct mCoreChannelInfo _GBVideoLayers[] = {
+	{ 0, "bg", "Background", NULL },
+	{ 1, "obj", "Objects", NULL },
+	{ 2, "win", "Window", NULL },
+};
+
+const static struct mCoreChannelInfo _GBAudioChannels[] = {
+	{ 0, "ch0", "Channel 0", "Square/Sweep" },
+	{ 1, "ch1", "Channel 1", "Square" },
+	{ 2, "ch2", "Channel 2", "PCM" },
+	{ 3, "ch3", "Channel 3", "Noise" },
+};
+
 struct GBCore {
 	struct mCore d;
 	struct GBVideoSoftwareRenderer renderer;
@@ -599,6 +612,37 @@ memcpy(gb->memory.sram, sram, size);
 	return true;
 }
 
+static size_t _GBCoreListVideoLayers(const struct mCore* core, const struct mCoreChannelInfo** info) {
+	UNUSED(core);
+	*info = _GBVideoLayers;
+	return sizeof(_GBVideoLayers) / sizeof(*_GBVideoLayers);
+}
+
+static size_t _GBCoreListAudioChannels(const struct mCore* core, const struct mCoreChannelInfo** info) {
+	UNUSED(core);
+	*info = _GBAudioChannels;
+	return sizeof(_GBAudioChannels) / sizeof(*_GBAudioChannels);
+}
+
+static void _GBCoreEnableVideoLayer(struct mCore* core, size_t id, bool enable) {
+	struct GB* gb = core->board;
+	// TODO
+}
+
+static void _GBCoreEnableAudioChannel(struct mCore* core, size_t id, bool enable) {
+	struct GB* gb = core->board;
+	switch (id) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+		gb->audio.forceDisableCh[id] = !enable;
+		break;
+	default:
+		break;
+	}
+}
+
 struct mCore* GBCoreCreate(void) {
 	struct GBCore* gbcore = malloc(sizeof(*gbcore));
 	struct mCore* core = &gbcore->d;
@@ -669,5 +713,9 @@ #endif
 	core->cheatDevice = _GBCoreCheatDevice;
 	core->savedataClone = _GBCoreSavedataClone;
 	core->savedataRestore = _GBCoreSavedataRestore;
+	core->listVideoLayers = _GBCoreListVideoLayers;
+	core->listAudioChannels = _GBCoreListAudioChannels;
+	core->enableVideoLayer = _GBCoreEnableVideoLayer;
+	core->enableAudioChannel = _GBCoreEnableAudioChannel;
 	return core;
 }

@@ -26,6 +26,23 @@ #ifndef MINIMAL_CORE
 #include <mgba/internal/gba/input.h>
 #endif
 
+const static struct mCoreChannelInfo _GBAVideoLayers[] = {
+	{ 0, "bg0", "Background 0", NULL },
+	{ 1, "bg1", "Background 1", NULL },
+	{ 2, "bg2", "Background 2", NULL },
+	{ 3, "bg3", "Background 3", NULL },
+	{ 4, "obj", "Objects", NULL },
+};
+
+const static struct mCoreChannelInfo _GBAAudioChannels[] = {
+	{ 0, "ch0", "PSG Channel 0", "Square/Sweep" },
+	{ 1, "ch1", "PSG Channel 1", "Square" },
+	{ 2, "ch2", "PSG Channel 2", "PCM" },
+	{ 3, "ch3", "PSG Channel 3", "Noise" },
+	{ 4, "chA", "FIFO Channel A", NULL },
+	{ 5, "chB", "FIFO Channel B", NULL },
+};
+
 struct GBACore {
 	struct mCore d;
 	struct GBAVideoSoftwareRenderer renderer;
@@ -600,6 +617,54 @@ }
 	return success;
 }
 
+static size_t _GBACoreListVideoLayers(const struct mCore* core, const struct mCoreChannelInfo** info) {
+	UNUSED(core);
+	*info = _GBAVideoLayers;
+	return sizeof(_GBAVideoLayers) / sizeof(*_GBAVideoLayers);
+}
+
+static size_t _GBACoreListAudioChannels(const struct mCore* core, const struct mCoreChannelInfo** info) {
+	UNUSED(core);
+	*info = _GBAAudioChannels;
+	return sizeof(_GBAAudioChannels) / sizeof(*_GBAAudioChannels);
+}
+
+static void _GBACoreEnableVideoLayer(struct mCore* core, size_t id, bool enable) {
+	struct GBA* gba = core->board;
+	switch (id) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+		gba->video.renderer->disableBG[id] = !enable;
+		break;
+	case 4:
+		gba->video.renderer->disableOBJ = !enable;
+		break;
+	default:
+		break;
+	}
+}
+
+static void _GBACoreEnableAudioChannel(struct mCore* core, size_t id, bool enable) {
+	struct GBA* gba = core->board;
+	switch (id) {
+	case 0:
+	case 1:
+	case 2:
+	case 3:
+		gba->audio.psg.forceDisableCh[id] = !enable;
+		break;
+	case 4:
+		gba->audio.forceDisableChA = !enable;
+	case 5:
+		gba->audio.forceDisableChB = !enable;
+		break;
+	default:
+		break;
+	}
+}
+
 struct mCore* GBACoreCreate(void) {
 	struct GBACore* gbacore = malloc(sizeof(*gbacore));
 	struct mCore* core = &gbacore->d;
@@ -670,5 +735,9 @@ #endif
 	core->cheatDevice = _GBACoreCheatDevice;
 	core->savedataClone = _GBACoreSavedataClone;
 	core->savedataRestore = _GBACoreSavedataRestore;
+	core->listVideoLayers = _GBACoreListVideoLayers;
+	core->listAudioChannels = _GBACoreListAudioChannels;
+	core->enableVideoLayer = _GBACoreEnableVideoLayer;
+	core->enableAudioChannel = _GBACoreEnableAudioChannel;
 	return core;
 }

@@ -92,7 +92,7 @@ QString ConfigController::s_configDir;
 
 ConfigController::ConfigController(QObject* parent)
 	: QObject(parent)
-	, m_opts()
+	, m_opts{}
 {
 	QString fileName = configDir();
 	fileName.append(QDir::separator());

@@ -57,8 +57,8 @@ , m_turbo(false)
 	, m_turboForced(false)
 	, m_turboSpeed(-1)
 	, m_wasPaused(false)
-	, m_audioChannels{ true, true, true, true, true, true }
-	, m_videoLayers{ true, true, true, true, true }
+	, m_audioChannels()
+	, m_videoLayers()
 	, m_autofire{}
 	, m_autofireStatus{}
 	, m_inputController(nullptr)
@@ -69,6 +69,7 @@ , m_backupLoadState(nullptr)
 	, 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
@@ -90,35 +91,17 @@ GameController* controller = static_cast<GameController*>(context->userData);
 		context->core->setPeripheral(context->core, mPERIPH_ROTATION, controller->m_inputController->rotationSource());
 		context->core->setPeripheral(context->core, mPERIPH_RUMBLE, controller->m_inputController->rumble());
 
-#ifdef M_CORE_GBA
-		GBA* gba = static_cast<GBA*>(context->core->board);
-#endif
-#ifdef M_CORE_GB
-		GB* gb = static_cast<GB*>(context->core->board);
-#endif
+		for (size_t i = 0; i < controller->m_audioChannels.size(); ++i) {
+			context->core->enableAudioChannel(context->core, i, controller->m_audioChannels[i]);
+		}
+		for (size_t i = 0; i < controller->m_videoLayers.size(); ++i) {
+			context->core->enableVideoLayer(context->core, i, controller->m_videoLayers[i]);
+		}
+
 		switch (context->core->platform(context->core)) {
 #ifdef M_CORE_GBA
 		case PLATFORM_GBA:
 			context->core->setPeripheral(context->core, mPERIPH_GBA_LUMINANCE, &controller->m_lux);
-			gba->audio.psg.forceDisableCh[0] = !controller->m_audioChannels[0];
-			gba->audio.psg.forceDisableCh[1] = !controller->m_audioChannels[1];
-			gba->audio.psg.forceDisableCh[2] = !controller->m_audioChannels[2];
-			gba->audio.psg.forceDisableCh[3] = !controller->m_audioChannels[3];
-			gba->audio.forceDisableChA = !controller->m_audioChannels[4];
-			gba->audio.forceDisableChB = !controller->m_audioChannels[5];
-			gba->video.renderer->disableBG[0] = !controller->m_videoLayers[0];
-			gba->video.renderer->disableBG[1] = !controller->m_videoLayers[1];
-			gba->video.renderer->disableBG[2] = !controller->m_videoLayers[2];
-			gba->video.renderer->disableBG[3] = !controller->m_videoLayers[3];
-			gba->video.renderer->disableOBJ = !controller->m_videoLayers[4];
-			break;
-#endif
-#ifdef M_CORE_GB
-		case PLATFORM_GB:
-			gb->audio.forceDisableCh[0] = !controller->m_audioChannels[0];
-			gb->audio.forceDisableCh[1] = !controller->m_audioChannels[1];
-			gb->audio.forceDisableCh[2] = !controller->m_audioChannels[2];
-			gb->audio.forceDisableCh[3] = !controller->m_audioChannels[3];
 			break;
 #endif
 		default:
@@ -476,11 +459,20 @@
 	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();
@@ -880,47 +872,13 @@ void GameController::setAudioChannelEnabled(int channel, bool enable) {
 	if (channel > 5 || channel < 0) {
 		return;
 	}
-#ifdef M_CORE_GBA
-	GBA* gba = static_cast<GBA*>(m_threadContext.core->board);
-#endif
-#ifdef M_CORE_GB
-	GB* gb = static_cast<GB*>(m_threadContext.core->board);
-#endif
+	m_audioChannels.reserve(channel + 1);
+	while (m_audioChannels.size() <= channel) {
+		m_audioChannels.append(true);
+	}
 	m_audioChannels[channel] = enable;
 	if (isLoaded()) {
-		switch (channel) {
-		case 0:
-		case 1:
-		case 2:
-		case 3:
-			switch (m_threadContext.core->platform(m_threadContext.core)) {
-#ifdef M_CORE_GBA
-			case PLATFORM_GBA:
-				gba->audio.psg.forceDisableCh[channel] = !enable;
-				break;
-#endif
-#ifdef M_CORE_GB
-			case PLATFORM_GB:
-				gb->audio.forceDisableCh[channel] = !enable;
-				break;
-#endif
-			default:
-				break;
-			}
-			break;
-#ifdef M_CORE_GBA
-		case 4:
-			if (m_threadContext.core->platform(m_threadContext.core) == PLATFORM_GBA) {
-				gba->audio.forceDisableChA = !enable;
-			}
-			break;
-		case 5:
-			if (m_threadContext.core->platform(m_threadContext.core) == PLATFORM_GBA) {
-				gba->audio.forceDisableChB = !enable;
-			}
-			break;
-#endif
-		}
+		m_threadContext.core->enableAudioChannel(m_threadContext.core, channel, enable);
 	}
 }
 
@@ -939,23 +897,14 @@ void GameController::setVideoLayerEnabled(int layer, bool enable) {
 	if (layer > 4 || layer < 0) {
 		return;
 	}
+	m_videoLayers.reserve(layer + 1);
+	while (m_videoLayers.size() <= layer) {
+		m_videoLayers.append(true);
+	}
 	m_videoLayers[layer] = enable;
-#ifdef M_CORE_GBA
-	if (isLoaded() && m_threadContext.core->platform(m_threadContext.core) == PLATFORM_GBA) {
-		GBA* gba = static_cast<GBA*>(m_threadContext.core->board);
-		switch (layer) {
-		case 0:
-		case 1:
-		case 2:
-		case 3:
-			gba->video.renderer->disableBG[layer] = !enable;
-			break;
-		case 4:
-			gba->video.renderer->disableOBJ = !enable;
-			break;
-		}
+	if (isLoaded()) {
+		m_threadContext.core->enableVideoLayer(m_threadContext.core, layer, enable);
 	}
-#endif
 }
 
 void GameController::setFPSTarget(float fps) {
@@ -1180,6 +1129,10 @@ }
 
 void GameController::setLoadStateExtdata(int flags) {
 	m_loadStateFlags = flags;
+}
+
+void GameController::setPreload(bool preload) {
+	m_preload = preload;
 }
 
 void GameController::setLuminanceValue(uint8_t value) {

@@ -156,6 +156,7 @@ void clearAVStream();
 	void reloadAudioDriver();
 	void setSaveStateExtdata(int flags);
 	void setLoadStateExtdata(int flags);
+	void setPreload(bool);
 
 #ifdef USE_PNG
 	void screenshot();
@@ -224,8 +225,8 @@ bool m_wasPaused;
 
 	std::shared_ptr<mTileCache> m_tileCache;
 
-	bool m_audioChannels[6];
-	bool m_videoLayers[5];
+	QList<bool> m_audioChannels;
+	QList<bool> m_videoLayers;
 
 	bool m_autofire[GBA_KEY_MAX];
 	int m_autofireStatus[GBA_KEY_MAX];
@@ -235,6 +236,8 @@ struct VFile* m_backupLoadState;
 	QByteArray m_backupSaveState;
 	int m_saveStateFlags;
 	int m_loadStateFlags;
+
+	bool m_preload;
 
 	InputController* m_inputController;
 	MultiplayerController* m_multiplayer;

@@ -191,6 +191,7 @@ saveSetting("savestatePath", m_ui.savestatePath);
 	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");
@@ -273,6 +274,7 @@ loadSetting("savestatePath", m_ui.savestatePath);
 	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) {

@@ -568,21 +568,21 @@ </property>
          </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 @@ <bool>true</bool>
          </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 @@ <bool>true</bool>
          </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 @@ <bool>true</bool>
          </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 @@ <bool>true</bool>
          </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>
@@ -657,6 +657,13 @@ <string>Rewind affects save data</string>
          </property>
          <property name="checked">
           <bool>true</bool>
+         </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>

@@ -335,19 +335,6 @@ const mCoreOptions* opts = m_config->options();
 
 	m_log.setLevels(opts->logLevel);
 
-	QString saveStateExtdata = m_config->getOption("saveStateExtdata");
-	bool ok;
-	int flags = saveStateExtdata.toInt(&ok);
-	if (ok) {
-		m_controller->setSaveStateExtdata(flags);
-	}
-
-	QString loadStateExtdata = m_config->getOption("loadStateExtdata");
-	flags = loadStateExtdata.toInt(&ok);
-	if (ok) {
-		m_controller->setLoadStateExtdata(flags);
-	}
-
 	m_controller->setConfig(m_config->config());
 	m_display->lockAspectRatio(opts->lockAspectRatio);
 	m_display->filter(opts->resampleVideo);
@@ -1547,11 +1534,19 @@ ConfigOption* saveStateExtdata = m_config->addOption("saveStateExtdata");
 	saveStateExtdata->connect([this](const QVariant& value) {
 		m_controller->setSaveStateExtdata(value.toInt());
 	}, this);
+	m_config->updateOption("saveStateExtdata");
 
 	ConfigOption* loadStateExtdata = m_config->addOption("loadStateExtdata");
 	loadStateExtdata->connect([this](const QVariant& value) {
 		m_controller->setLoadStateExtdata(value.toInt());
 	}, this);
+	m_config->updateOption("loadStateExtdata");
+
+	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()));

@@ -5,7 +5,11 @@ * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #include <mgba-util/string.h>
 
+#include <mgba-util/vector.h>
+
 #include <string.h>
+
+DEFINE_VECTOR(StringList, char*);
 
 #ifndef HAVE_STRNDUP
 char* strndup(const char* start, size_t len) {