From 91993ef4a3b43e6c5821189d85649dfe45f5b1f1 Mon Sep 17 00:00:00 2001
From: kichikuou <KichikuouChrome@gmail.com>
Date: Sun, 9 Feb 2020 18:33:20 +0900
Subject: [PATCH] Android: CD-DA emulation support

---
 .../github/kichikuou/system3/GameActivity.kt  |  8 +--
 src/CMakeLists.txt                            |  9 ++--
 src/android/mako.cpp                          | 53 +++++++++++++++++++
 src/sys/mako.h                                |  4 +-
 4 files changed, 65 insertions(+), 9 deletions(-)
 create mode 100644 src/android/mako.cpp

diff --git a/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt b/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt
index 9b95544..154eeec 100644
--- a/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt
+++ b/android/app/src/main/java/io/github/kichikuou/system3/GameActivity.kt
@@ -72,7 +72,7 @@ class GameActivity : SDLActivity() {
     }
 
     // These functions are called in the SDL thread by JNI.
-    @Suppress("unused") fun cddaStart(track: Int, loop: Int) = cdda.start(track, loop)
+    @Suppress("unused") fun cddaStart(track: Int, loop: Boolean) = cdda.start(track, loop)
     @Suppress("unused") fun cddaStop() = cdda.stop()
     @Suppress("unused") fun cddaCurrentPosition() = cdda.currentPosition()
     @Suppress("unused") fun midiStart(buf: ByteArray, loop: Int) = midi.start(buf, loop)
@@ -92,18 +92,18 @@ private class CddaPlayer(private val playlistPath: File) {
     private val player = MediaPlayer()
     private var playerPaused = false
 
-    fun start(track: Int, loop: Int) {
+    fun start(track: Int, loop: Boolean) {
         val f = playlist.elementAtOrNull(track)
         if (f.isNullOrEmpty()) {
             Log.w("cddaStart", "No playlist entry for track $track")
             return
         }
-        Log.v("cddaStart", f)
+        Log.v("cddaStart", "${f} Loop:${loop}")
         try {
             player.apply {
                 reset()
                 setDataSource(File(playlistPath.parent, f).path)
-                isLooping = loop == 0
+                isLooping = loop
                 prepare()
                 start()
             }
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 9df3491..827f796 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -30,10 +30,13 @@ if (CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
 	linux/nact_linux.cpp
 	emscripten/mako.cpp
 	)
+elseif (CMAKE_SYSTEM_NAME STREQUAL "Android")
+  set(SRC_PLATFORM
+	linux/nact_linux.cpp
+	android/mako.cpp
+	)
 else()
-  if (NOT ANDROID)
-	set(DEFAULT_FONT_PATH ${CMAKE_INSTALL_PREFIX}/share/system3/fonts/)
-  endif()
+  set(DEFAULT_FONT_PATH ${CMAKE_INSTALL_PREFIX}/share/system3/fonts/)
 
   set(SRC_MAKO
 	sys/mako.cpp
diff --git a/src/android/mako.cpp b/src/android/mako.cpp
new file mode 100644
index 0000000..31124f1
--- /dev/null
+++ b/src/android/mako.cpp
@@ -0,0 +1,53 @@
+#include <SDL.h>
+#include <android/log.h>
+#include <jni.h>
+#include "mako.h"
+
+MAKO::MAKO(NACT* parent)
+	: current_music(0)
+	, next_loop(0)
+{
+	for (int i = 1; i <= 99; i++)
+		cd_track[i] = i;
+}
+
+void MAKO::play_music(int page)
+{
+	if (current_music == page)
+		return;
+
+	JNIEnv* env = (JNIEnv*)SDL_AndroidGetJNIEnv();
+	if (env->PushLocalFrame(16) < 0) {
+		__android_log_write(ANDROID_LOG_ERROR, "system3",
+							"Failed to allocate JVM local references");
+		return;
+	}
+	jobject context = (jobject)SDL_AndroidGetActivity();
+	jmethodID mid = env->GetMethodID(env->GetObjectClass(context),
+									 "cddaStart", "(IZ)V");
+	env->CallVoidMethod(context, mid, cd_track[page] + 1, next_loop ? 0 : 1);
+	env->PopLocalFrame(NULL);
+
+	current_music = page;
+	next_loop = 0;
+}
+
+void MAKO::stop_music()
+{
+	if (!current_music)
+		return;
+
+	JNIEnv* env = (JNIEnv*)SDL_AndroidGetJNIEnv();
+	if (env->PushLocalFrame(16) < 0) {
+		__android_log_write(ANDROID_LOG_ERROR, "system3",
+							"Failed to allocate JVM local references");
+		return;
+	}
+	jobject context = (jobject)SDL_AndroidGetActivity();
+	jmethodID mid = env->GetMethodID(env->GetObjectClass(context),
+									 "cddaStop", "()V");
+	env->CallVoidMethod(context, mid);
+	env->PopLocalFrame(NULL);
+
+	current_music = 0;
+}
diff --git a/src/sys/mako.h b/src/sys/mako.h
index 2fe9606..f6dd0d0 100644
--- a/src/sys/mako.h
+++ b/src/sys/mako.h
@@ -13,7 +13,7 @@
 #include "../common.h"
 #include "nact.h"
 
-#ifndef EMSCRIPTEN
+#if !defined(__EMSCRIPTEN__) && !defined(__ANDROID__)
 
 #define MAX_SAMPLES (128 * 1024)
 #define MAX_MMLS (128 * 1024)
@@ -128,7 +128,7 @@ public:
 	int cd_track[100];	// Z
 };
 
-#else // EMSCRIPTEN
+#else // Emscripten or Android
 
 class MAKO {
 public: