Add Genesis emulation support with bundled Genesis Plus GX core
Bundles genesis_plus_gx_libretro_android.so (~12 MB) as an asset and wires up GenesisCore with 3/6-button Genesis mappings (A/B/C/X/Y/Z/ Mode/Start/D-pad) following Genesis Plus GX's default retropad layout.
This commit is contained in:
BIN
app/src/main/assets/cores/genesis_plus_gx_libretro_android.so
Executable file
BIN
app/src/main/assets/cores/genesis_plus_gx_libretro_android.so
Executable file
Binary file not shown.
@@ -43,6 +43,7 @@ enum class ConsoleType(
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displayName = "Sega Genesis",
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manufacturer = "Sega",
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fileExtensions = listOf("gen", "md", "smd", "bin"),
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isImplemented = true,
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fallbackAspectRatio = 4f / 3f,
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libretroThumbnailRepo = "Sega_-_Mega_Drive_-_Genesis"
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),
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@@ -1,6 +1,7 @@
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package com.lazy.emulate.emulation
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import android.content.Context
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import com.lazy.emulate.emulation.cores.GenesisCore
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import com.lazy.emulate.emulation.cores.NesCore
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import com.lazy.emulate.emulation.cores.PlaceholderCore
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import com.lazy.emulate.emulation.cores.Ps1Core
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@@ -18,7 +19,7 @@ object EmulationEngine {
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ConsoleType.NES -> NesCore(context, buttonMappingManager)
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ConsoleType.SNES -> SnesCore(context, buttonMappingManager)
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ConsoleType.N64 -> PlaceholderCore(ConsoleType.N64)
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ConsoleType.GENESIS -> PlaceholderCore(ConsoleType.GENESIS)
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ConsoleType.GENESIS -> GenesisCore(context, buttonMappingManager)
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ConsoleType.PS2 -> PlaceholderCore(ConsoleType.PS2)
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}
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}
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@@ -0,0 +1,242 @@
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package com.lazy.emulate.emulation.cores
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import android.content.Context
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import android.util.Log
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import android.view.Surface
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import com.lazy.emulate.emulation.ConsoleType
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import com.lazy.emulate.emulation.DisplayMode
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import com.lazy.emulate.emulation.EmulatorCore
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import com.lazy.emulate.emulation.NativeLibretro
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import com.lazy.emulate.emulation.SaveSlotInfo
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import com.lazy.emulate.input.ButtonMappingManager
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import com.lazy.emulate.input.GamepadButton
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import java.io.File
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class GenesisCore(
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private val context: Context,
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private val buttonMappingManager: ButtonMappingManager? = null
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) : EmulatorCore {
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override val consoleType = ConsoleType.GENESIS
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override var isRunning: Boolean = false
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private set
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private var buttonState: Int = 0
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private val coresDir = File(context.filesDir, "cores")
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private val systemDir = File(context.filesDir, "system")
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private val baseSavesDir = File(context.filesDir, "saves")
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private lateinit var savesDir: File
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override fun loadRom(path: String): Boolean {
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coresDir.mkdirs()
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systemDir.mkdirs()
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val romName = File(path).nameWithoutExtension
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savesDir = File(baseSavesDir, romName)
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savesDir.mkdirs()
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NativeLibretro.nativeSetSystemDir(systemDir.absolutePath)
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NativeLibretro.nativeSetSaveDir(savesDir.absolutePath)
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val corePath = findCorePath()
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if (corePath == null) {
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Log.e(TAG, "Genesis core .so not found. Place genesis_plus_gx_libretro_android.so in ${coresDir.absolutePath}")
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return false
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}
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if (!NativeLibretro.nativeLoadCore(corePath)) {
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Log.e(TAG, "Failed to load core: $corePath")
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return false
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}
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if (!NativeLibretro.nativeLoadGame(path)) {
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Log.e(TAG, "Failed to load game: $path")
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return false
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}
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Log.i(TAG, "Game loaded successfully: $path")
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return true
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}
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override fun start() {
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isRunning = true
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NativeLibretro.nativeStart()
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}
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override fun pause() {
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isRunning = false
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NativeLibretro.nativePause()
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}
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override fun resume() {
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isRunning = true
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NativeLibretro.nativeResume()
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}
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override fun stop() {
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isRunning = false
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NativeLibretro.nativeStop()
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}
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override fun reset() {
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NativeLibretro.nativeReset()
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}
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override fun setSurface(surface: Surface) {
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NativeLibretro.nativeSetSurface(surface)
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}
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override fun onButtonPressed(button: GamepadButton) {
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val bit = mapButtonToRetroId(button)
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if (bit >= 0) {
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buttonState = buttonState or (1 shl bit)
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NativeLibretro.nativeSetButtonState(buttonState)
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}
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}
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override fun onButtonReleased(button: GamepadButton) {
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val bit = mapButtonToRetroId(button)
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if (bit >= 0) {
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buttonState = buttonState and (1 shl bit).inv()
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NativeLibretro.nativeSetButtonState(buttonState)
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}
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}
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override fun onAnalogStick(x: Float, y: Float, stickIndex: Int) {
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// Genesis has no analog sticks
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}
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override fun saveState(slot: Int): Boolean {
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val path = File(savesDir, "state_$slot.sav").absolutePath
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return NativeLibretro.nativeSaveState(path)
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}
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override fun loadState(slot: Int): Boolean {
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val path = File(savesDir, "state_$slot.sav").absolutePath
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return NativeLibretro.nativeLoadState(path)
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}
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override fun deleteState(slot: Int): Boolean {
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val state = File(savesDir, "state_$slot.sav")
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val screenshot = File(savesDir, "state_$slot.jpg")
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val deleted = state.exists() && state.delete()
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if (screenshot.exists()) screenshot.delete()
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return deleted
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}
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override fun getSaveSlotInfo(slot: Int): SaveSlotInfo {
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val file = File(savesDir, "state_$slot.sav")
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val screenshot = File(savesDir, "state_$slot.jpg")
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return SaveSlotInfo(
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slot = slot,
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exists = file.exists(),
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lastModified = if (file.exists()) file.lastModified() else 0L,
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screenshotPath = if (screenshot.exists()) screenshot.absolutePath else null
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)
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}
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override fun getScreenshotPath(slot: Int): String =
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File(savesDir, "state_$slot.jpg").absolutePath
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override fun setAudioEnabled(enabled: Boolean) {
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NativeLibretro.nativeSetAudioEnabled(enabled)
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}
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override fun setFrameSkip(skip: Int) {
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NativeLibretro.nativeSetFrameSkip(skip)
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}
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override fun setDisplayMode(mode: DisplayMode) {
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NativeLibretro.nativeSetDisplayMode(mode.nativeValue)
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}
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private fun findCorePath(): String? {
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val names = listOf(
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"genesis_plus_gx_libretro_android.so",
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"genesis_plus_gx_libretro.so",
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"picodrive_libretro_android.so",
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"picodrive_libretro.so",
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)
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// Check internal cores dir first
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for (name in names) {
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val file = File(coresDir, name)
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if (file.exists()) return file.absolutePath
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}
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// Extract bundled core from assets
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for (name in names) {
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try {
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context.assets.open("cores/$name").use { input ->
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val dest = File(coresDir, name)
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dest.outputStream().use { output -> input.copyTo(output) }
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dest.setExecutable(true)
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Log.i(TAG, "Extracted bundled core: $name")
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return dest.absolutePath
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}
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} catch (_: Exception) {
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// Asset doesn't exist, try next
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}
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}
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// Fallback: auto-import from /sdcard/Games/cores/
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val sdcardCores = File("/sdcard/Games/cores")
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if (sdcardCores.exists()) {
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for (name in names) {
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val sdFile = File(sdcardCores, name)
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if (sdFile.exists()) {
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val dest = File(coresDir, name)
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try {
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sdFile.copyTo(dest, overwrite = true)
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dest.setExecutable(true)
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Log.i(TAG, "Imported core from sdcard: $name")
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return dest.absolutePath
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} catch (e: Exception) {
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Log.e(TAG, "Failed to import core: ${e.message}")
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}
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}
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}
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}
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return null
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}
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private fun mapButtonToRetroId(button: GamepadButton): Int {
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if (buttonMappingManager != null) {
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return buttonMappingManager.getRetroId(consoleType, button)
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}
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return defaultMapButtonToRetroId(button)
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}
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private fun defaultMapButtonToRetroId(button: GamepadButton): Int {
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// Genesis Plus GX default retropad -> Genesis mapping:
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// RETRO_Y (1) -> Genesis A
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// RETRO_B (0) -> Genesis B
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// RETRO_A (8) -> Genesis C
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// RETRO_L (10) -> Genesis X (6-button)
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// RETRO_X (9) -> Genesis Y (6-button)
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// RETRO_R (11) -> Genesis Z (6-button)
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// RETRO_SELECT (2) -> Mode
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// RETRO_START (3) -> Start
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return when (button) {
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GamepadButton.FACE_BOTTOM -> 1 // Genesis A
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GamepadButton.FACE_RIGHT -> 0 // Genesis B
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GamepadButton.FACE_LEFT -> 8 // Genesis C
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GamepadButton.FACE_TOP -> 9 // Genesis Y (6-button)
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GamepadButton.L1 -> 10 // Genesis X (6-button)
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GamepadButton.R1 -> 11 // Genesis Z (6-button)
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GamepadButton.C_BUTTON -> 8 // alt binding for C
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GamepadButton.Z_BUTTON -> 11 // alt binding for Z
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GamepadButton.DPAD_UP -> 4
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GamepadButton.DPAD_DOWN -> 5
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GamepadButton.DPAD_LEFT -> 6
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GamepadButton.DPAD_RIGHT -> 7
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GamepadButton.MODE -> 2
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GamepadButton.SELECT -> 2
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GamepadButton.START -> 3
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else -> -1
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}
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}
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companion object {
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private const val TAG = "GenesisCore"
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}
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}
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@@ -47,6 +47,23 @@ class ButtonMappingManager(private val preferencesManager: PreferencesManager) {
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GamepadButton.DPAD_RIGHT to 7,
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GamepadButton.SELECT to 2,
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GamepadButton.START to 3
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),
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ConsoleType.GENESIS to mapOf(
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// Genesis Plus GX default retropad -> Genesis mapping
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GamepadButton.FACE_BOTTOM to 1, // Genesis A (RETRO_Y)
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GamepadButton.FACE_RIGHT to 0, // Genesis B (RETRO_B)
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GamepadButton.FACE_LEFT to 8, // Genesis C (RETRO_A)
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GamepadButton.FACE_TOP to 9, // Genesis Y (6-button)
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GamepadButton.L1 to 10, // Genesis X (6-button)
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GamepadButton.R1 to 11, // Genesis Z (6-button)
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GamepadButton.C_BUTTON to 8, // alt C
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GamepadButton.Z_BUTTON to 11, // alt Z
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GamepadButton.DPAD_UP to 4,
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GamepadButton.DPAD_DOWN to 5,
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GamepadButton.DPAD_LEFT to 6,
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GamepadButton.DPAD_RIGHT to 7,
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GamepadButton.MODE to 2, // Genesis Mode
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GamepadButton.START to 3
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)
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)
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