Drop direct use of (private) libEGL.so and call EGL functions via Java.

This removes the final private library - we should be completely above
board now.

svn-id: r50677

3 files changed, 116 insertions, 125 deletions

diff --git a/backends/platform/android/README.build b/backends/platform/android/README.build
index 0aa5c6eefd..3d1cf433a7 100644
--- a/backends/platform/android/README.build
+++ b/backends/platform/android/README.build
@@ -2,9 +2,8 @@ Building the ScummVM Android port
 =================================
 
 You will need these things to build:
-1. Android EGL headers and library
-2. Android SDK
-3. An arm-oe-linux-androideabi GCC toolchain(*)
+1. Android SDK
+2. An arm-oe-linux-androideabi GCC toolchain(*)
 
 In the example commands, we are going to build against the Android 1.5
 native ABI (but using the Android 1.6 SDK tools).  Other version
@@ -18,21 +17,13 @@ you have some other prefix variation.
 
 In detail:
 
-1. Android EGL headers and library
+1. Android SDK
 
-You can build these from the full Android source, but it is far easier
-to just download the 3 Android EGL headers from here:
- http://android.git.kernel.org/?p=platform/frameworks/base.git;a=tree;f=opengl/include/EGL;hb=HEAD
- (copy them to a directory called "EGL" somewhere)
+Download the SDK from http://developer.android.com/ and install
+somewhere.  You will need both the API level 8 (aka Android 2.2) and
+API level 3 (aka Android 1.5) platforms.
 
-... and grab libEGL.so off an existing phone/emulator:
- adb pull /system/lib/libEGL.so /tmp
-
-2. Android SDK
-
-Download and install somewhere.
-
-3. arm-*-linux-androideabi GCC toolchain
+2. arm-*-linux-androideabi GCC toolchain
 
 You have several choices for toolchains:
 
@@ -95,11 +86,6 @@ Then build ScummVM:
 
  export ANDROID_TOP=<root of built Android source>
 
- EGL_INC="-I<location of EGL/ header directory>"
- EGL_LIBS="-L<location of libEGL.so>"
-
- CPPFLAGS="$EGL_INC" \
- LDFLAGS="-g $EGL_LIBS" \
  ./configure --backend=android --host=android --enable-zlib #and any other flags
  make scummvm.apk
 
diff --git a/backends/platform/android/android.cpp b/backends/platform/android/android.cpp
index 105561e595..f6af0fcff5 100644
--- a/backends/platform/android/android.cpp
+++ b/backends/platform/android/android.cpp
@@ -41,7 +41,6 @@
 
 #include <GLES/gl.h>
 #include <GLES/glext.h>
-#include <EGL/egl.h>
 #include <android/log.h>
 
 #include "common/archive.h"
@@ -166,12 +165,11 @@ private:
 	jmethodID MID_getPluginDirectories;
 	jmethodID MID_setupScummVMSurface;
 	jmethodID MID_destroyScummVMSurface;
+	jmethodID MID_swapBuffers;
 
 	int _screen_changeid;
-	EGLDisplay _egl_display;
-	EGLSurface _egl_surface;
-	EGLint _egl_surface_width;
-	EGLint _egl_surface_height;
+	int _egl_surface_width;
+	int _egl_surface_height;
 
 	bool _force_redraw;
 
@@ -223,6 +221,10 @@ public:
 	virtual void initBackend();
 	void addPluginDirectories(Common::FSList &dirs) const;
 	void enableZoning(bool enable) { _enable_zoning = enable; }
+	void setSurfaceSize(int width, int height) {
+		_egl_surface_width = width;
+		_egl_surface_height = height;
+	}
 
 	virtual bool hasFeature(Feature f);
 	virtual void setFeatureState(Feature f, bool enable);
@@ -303,8 +305,6 @@ public:
 
 OSystem_Android::OSystem_Android(jobject am)
 	: _back_ptr(0),
-	  _egl_display(EGL_NO_DISPLAY),
-	  _egl_surface(EGL_NO_SURFACE),
 	  _screen_changeid(0),
 	  _force_redraw(false),
 	  _game_texture(NULL),
@@ -369,6 +369,7 @@ bool OSystem_Android::initJavaHooks(JNIEnv* env, jobject self) {
 	FIND_METHOD(getPluginDirectories, "()[Ljava/lang/String;");
 	FIND_METHOD(setupScummVMSurface, "()V");
 	FIND_METHOD(destroyScummVMSurface, "()V");
+	FIND_METHOD(swapBuffers, "()Z");
 
 #undef FIND_METHOD
 
@@ -581,6 +582,7 @@ int OSystem_Android::getGraphicsMode() const {
 }
 
 void OSystem_Android::setupScummVMSurface() {
+	ENTER("setupScummVMSurface");
 	JNIEnv* env = JNU_GetEnv();
 	env->CallVoidMethod(_back_ptr, MID_setupScummVMSurface);
 	if (env->ExceptionCheck())
@@ -588,37 +590,8 @@ void OSystem_Android::setupScummVMSurface() {
 
 	// EGL set up with a new surface.  Initialise OpenGLES context.
 
-	_egl_display = eglGetCurrentDisplay();
-	_egl_surface = eglGetCurrentSurface(EGL_DRAW);
-
-	static bool log_version = true;
-	if (log_version) {
-		__android_log_print(ANDROID_LOG_INFO, LOG_TAG,
-							"Using EGL %s (%s); GL %s/%s (%s)",
-							eglQueryString(_egl_display, EGL_VERSION),
-							eglQueryString(_egl_display, EGL_VENDOR),
-							glGetString(GL_VERSION),
-							glGetString(GL_RENDERER),
-							glGetString(GL_VENDOR));
-		log_version = false;		// only log this once
-	}
-
 	GLESTexture::initGLExtensions();
 
-	if (!eglQuerySurface(_egl_display, _egl_surface,
-						 EGL_WIDTH, &_egl_surface_width) ||
-		!eglQuerySurface(_egl_display, _egl_surface,
-						 EGL_HEIGHT, &_egl_surface_height)) {
-		JNU_ThrowByName(env, "java/lang/RuntimeException",
-						"Error fetching EGL surface width/height");
-		return;
-	}
-	__android_log_print(ANDROID_LOG_INFO, LOG_TAG,
-						"New surface is %dx%d",
-						_egl_surface_width, _egl_surface_height);
-
-	CHECK_GL_ERROR();
-
 	// Turn off anything that looks like 3D ;)
 	glDisable(GL_CULL_FACE);
 	glDisable(GL_DEPTH_TEST);
@@ -664,7 +637,6 @@ void OSystem_Android::setupScummVMSurface() {
 }
 
 void OSystem_Android::destroyScummVMSurface() {
-	_egl_surface = EGL_NO_SURFACE;
 	JNIEnv* env = JNU_GetEnv();
 	env->CallVoidMethod(_back_ptr, MID_destroyScummVMSurface);
 	// Can't use OpenGLES functions after this
@@ -745,8 +717,11 @@ void OSystem_Android::updateScreen() {
 
 	glPushMatrix();
 
-	if (_shake_offset != 0) {
-		// This is the only case where _game_texture doesn't
+	if (_shake_offset != 0 ||
+		(!_focus_rect.isEmpty() &&
+		 !Common::Rect(_game_texture->width(),
+					   _game_texture->height()).contains(_focus_rect))) {
+		// These are the only cases where _game_texture doesn't
 		// cover the entire screen.
 		glClearColorx(0, 0, 0, 1 << 16);
 		glClear(GL_COLOR_BUFFER_BIT);
@@ -759,16 +734,6 @@ void OSystem_Android::updateScreen() {
 		_game_texture->drawTexture(0, 0,
 								   _egl_surface_width, _egl_surface_height);
 	} else {
-		// Need to ensure any exposed out-of-bounds region doesn't go
-		// all hall-of-mirrors.  If _shake_offset != 0, we've already
-		// done this above.
-		const Common::Rect
-			screen_bounds(_game_texture->width(), _game_texture->height());
-		if (!screen_bounds.contains(_focus_rect) && _shake_offset != 0) {
-			glClearColorx(0, 0, 0, 1 << 16);
-			glClear(GL_COLOR_BUFFER_BIT);
-		}
-
 		glPushMatrix();
 		glScalex(xdiv(_egl_surface_width, _focus_rect.width()),
 				 xdiv(_egl_surface_height, _focus_rect.height()),
@@ -831,14 +796,11 @@ void OSystem_Android::updateScreen() {
 
 	CHECK_GL_ERROR();
 
-	if (!eglSwapBuffers(_egl_display, _egl_surface)) {
-		EGLint error = eglGetError();
-		warning("eglSwapBuffers exited with error 0x%x", error);
-		// Some errors mean we need to reinit GL
-		if (error == EGL_CONTEXT_LOST) {
-			destroyScummVMSurface();
-			setupScummVMSurface();
-		}
+	JNIEnv* env = JNU_GetEnv();
+	if (!env->CallBooleanMethod(_back_ptr, MID_swapBuffers)) {
+		// Context lost -> need to reinit GL
+		destroyScummVMSurface();
+		setupScummVMSurface();
 	}
 }
 
@@ -1365,6 +1327,12 @@ static void ScummVM_enableZoning(JNIEnv* env, jobject self, jboolean enable) {
 	cpp_obj->enableZoning(enable);
 }
 
+static void ScummVM_setSurfaceSize(JNIEnv* env, jobject self,
+								   jint width, jint height) {
+	OSystem_Android* cpp_obj = OSystem_Android::fromJavaObject(env, self);
+	cpp_obj->setSurfaceSize(width, height);	
+}
+
 const static JNINativeMethod gMethods[] = {
 	{ "create", "(Landroid/content/res/AssetManager;)V",
 	  (void*)ScummVM_create },
@@ -1381,6 +1349,8 @@ const static JNINativeMethod gMethods[] = {
 	  (void*)ScummVM_setConfManString },
 	{ "enableZoning", "(Z)V",
 	  (void*)ScummVM_enableZoning },
+	{ "setSurfaceSize", "(II)V",
+	  (void*)ScummVM_setSurfaceSize },
 };
 
 JNIEXPORT jint JNICALL
diff --git a/backends/platform/android/org/inodes/gus/scummvm/ScummVM.java b/backends/platform/android/org/inodes/gus/scummvm/ScummVM.java
index 4ce8a85f30..d39aa363ef 100644
--- a/backends/platform/android/org/inodes/gus/scummvm/ScummVM.java
+++ b/backends/platform/android/org/inodes/gus/scummvm/ScummVM.java
@@ -12,7 +12,10 @@ import android.util.Log;
 import android.view.Surface;
 import android.view.SurfaceHolder;
 
+import javax.microedition.khronos.opengles.GL;
+import javax.microedition.khronos.opengles.GL10;
 import javax.microedition.khronos.egl.EGL10;
+import javax.microedition.khronos.egl.EGL11;
 import javax.microedition.khronos.egl.EGLConfig;
 import javax.microedition.khronos.egl.EGLContext;
 import javax.microedition.khronos.egl.EGLDisplay;
@@ -30,11 +33,11 @@ import java.util.concurrent.Semaphore;
 public class ScummVM implements SurfaceHolder.Callback {
 	private final static String LOG_TAG = "ScummVM.java";
 
-	private final int AUDIO_FRAME_SIZE = 2 * 2;  // bytes. 16bit audio * stereo
+	private final int AUDIO_FRAME_SIZE = 2 * 2;	 // bytes. 16bit audio * stereo
 	public static class AudioSetupException extends Exception {}
 
 	private long nativeScummVM;	// native code hangs itself here
-    boolean scummVMRunning = false;
+	boolean scummVMRunning = false;
 
 	private native void create(AssetManager am);
 
@@ -54,49 +57,49 @@ public class ScummVM implements SurfaceHolder.Callback {
 		destroy();
 	}
 
-    // Surface creation:
-    // GUI thread: create surface, release lock
-    // ScummVM thread: acquire lock (block), read surface
-    //
-    // Surface deletion:
-    // GUI thread: post event, acquire lock (block), return
-    // ScummVM thread: read event, free surface, release lock
-    //
-    // In other words, ScummVM thread does this:
-    //  acquire lock
-    //  setup surface
-    //  when SCREEN_CHANGED arrives:
-    //   destroy surface
-    //   release lock
-    //  back to acquire lock
-    static final int configSpec[] = {
+	// Surface creation:
+	// GUI thread: create surface, release lock
+	// ScummVM thread: acquire lock (block), read surface
+	//
+	// Surface deletion:
+	// GUI thread: post event, acquire lock (block), return
+	// ScummVM thread: read event, free surface, release lock
+	//
+	// In other words, ScummVM thread does this:
+	//	acquire lock
+	//	setup surface
+	//	when SCREEN_CHANGED arrives:
+	//	 destroy surface
+	//	 release lock
+	//	back to acquire lock
+	static final int configSpec[] = {
 		EGL10.EGL_RED_SIZE, 5,
 		EGL10.EGL_GREEN_SIZE, 5,
 		EGL10.EGL_BLUE_SIZE, 5,
 		EGL10.EGL_DEPTH_SIZE, 0,
 		EGL10.EGL_SURFACE_TYPE, EGL10.EGL_WINDOW_BIT,
 		EGL10.EGL_NONE,
-    };
-    EGL10 egl;
-    EGLDisplay eglDisplay = EGL10.EGL_NO_DISPLAY;
-    EGLConfig eglConfig;
-    EGLContext eglContext = EGL10.EGL_NO_CONTEXT;
-    EGLSurface eglSurface = EGL10.EGL_NO_SURFACE;
-    Semaphore surfaceLock = new Semaphore(0, true);
-    SurfaceHolder nativeSurface;
-
-    public void surfaceCreated(SurfaceHolder holder) {
+	};
+	EGL10 egl;
+	EGLDisplay eglDisplay = EGL10.EGL_NO_DISPLAY;
+	EGLConfig eglConfig;
+	EGLContext eglContext = EGL10.EGL_NO_CONTEXT;
+	EGLSurface eglSurface = EGL10.EGL_NO_SURFACE;
+	Semaphore surfaceLock = new Semaphore(0, true);
+	SurfaceHolder nativeSurface;
+
+	public void surfaceCreated(SurfaceHolder holder) {
 		nativeSurface = holder;
 		surfaceLock.release();
-    }
+	}
 
-    public void surfaceChanged(SurfaceHolder holder, int format,
+	public void surfaceChanged(SurfaceHolder holder, int format,
 							   int width, int height) {
 		// Disabled while I debug GL problems
 		//pushEvent(new Event(Event.EVENT_SCREEN_CHANGED));
-    }
+	}
 
-    public void surfaceDestroyed(SurfaceHolder holder) {
+	public void surfaceDestroyed(SurfaceHolder holder) {
 		pushEvent(new Event(Event.EVENT_SCREEN_CHANGED));
 		try {
 			surfaceLock.acquire();
@@ -104,10 +107,10 @@ public class ScummVM implements SurfaceHolder.Callback {
 			Log.e(this.toString(),
 				  "Interrupted while waiting for surface lock", e);
 		}
-    }
+	}
 
-    // Called by ScummVM thread (from initBackend)
-    private void createScummVMGLContext() {
+	// Called by ScummVM thread (from initBackend)
+	private void createScummVMGLContext() {
 		egl = (EGL10)EGLContext.getEGL();
 		eglDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
 		int[] version = new int[2];
@@ -126,10 +129,11 @@ public class ScummVM implements SurfaceHolder.Callback {
 
 		eglContext = egl.eglCreateContext(eglDisplay, eglConfig,
 										  EGL10.EGL_NO_CONTEXT, null);
-    }
+	}
 
-    // Called by ScummVM thread
-    protected void setupScummVMSurface() {
+	// Called by ScummVM thread
+	static private boolean _log_version = true;
+	protected void setupScummVMSurface() {
 		try {
 			surfaceLock.acquire();
 		} catch (InterruptedException e) {
@@ -140,10 +144,30 @@ public class ScummVM implements SurfaceHolder.Callback {
 		eglSurface = egl.eglCreateWindowSurface(eglDisplay, eglConfig,
 												nativeSurface, null);
 		egl.eglMakeCurrent(eglDisplay, eglSurface, eglSurface, eglContext);
-    }
 
-    // Called by ScummVM thread
-    protected void destroyScummVMSurface() {
+		GL10 gl = (GL10)eglContext.getGL();
+
+		if (_log_version) {
+			Log.i(LOG_TAG, String.format("Using EGL %s (%s); GL %s/%s (%s)",
+										 egl.eglQueryString(eglDisplay, EGL10.EGL_VERSION),
+										 egl.eglQueryString(eglDisplay, EGL10.EGL_VENDOR),
+										 gl.glGetString(GL10.GL_VERSION),
+										 gl.glGetString(GL10.GL_RENDERER),
+										 gl.glGetString(GL10.GL_VENDOR)));
+			_log_version = false; // only log this once
+		}
+
+		int[] value = new int[1];
+		egl.eglQuerySurface(eglDisplay, eglSurface, EGL10.EGL_WIDTH, value);
+		int width = value[0];
+		egl.eglQuerySurface(eglDisplay, eglSurface, EGL10.EGL_HEIGHT, value);
+		int height = value[0];
+		Log.i(LOG_TAG, String.format("New surface is %dx%d", width, height));
+		setSurfaceSize(width, height);
+	}
+
+	// Called by ScummVM thread
+	protected void destroyScummVMSurface() {
 		if (eglSurface != null) {
 			egl.eglMakeCurrent(eglDisplay, EGL10.EGL_NO_SURFACE,
 							   EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
@@ -152,17 +176,28 @@ public class ScummVM implements SurfaceHolder.Callback {
 		}
 
 		surfaceLock.release();
-    }
+	}
 
-    public void setSurface(SurfaceHolder holder) {
+	public void setSurface(SurfaceHolder holder) {
 		holder.addCallback(this);
-    }
+	}
+
+	final public boolean swapBuffers() {
+		if (!egl.eglSwapBuffers(eglDisplay, eglSurface)) {
+			int error = egl.eglGetError();
+			Log.w(LOG_TAG, String.format("eglSwapBuffers exited with error 0x%x", error));
+			if (error == EGL11.EGL_CONTEXT_LOST)
+				return false;
+		}
+		return true;
+	}
 
 	// Set scummvm config options
 	final public native static void loadConfigFile(String path);
 	final public native static void setConfMan(String key, int value);
 	final public native static void setConfMan(String key, String value);
 	final public native void enableZoning(boolean enable);
+	final public native void setSurfaceSize(int width, int height);
 
 	// Feed an event to ScummVM.  Safe to call from other threads.
 	final public native void pushEvent(Event e);
@@ -180,10 +215,10 @@ public class ScummVM implements SurfaceHolder.Callback {
 	protected void showVirtualKeyboard(boolean enable) {}
 	protected String[] getSysArchives() { return new String[0]; }
 	protected String[] getPluginDirectories() { return new String[0]; }
-    protected void initBackend() throws AudioSetupException {
+	protected void initBackend() throws AudioSetupException {
 		createScummVMGLContext();
 		initAudio();
-    }
+	}
 
 	private static class AudioThread extends Thread {
 		final private int buf_size;
@@ -240,7 +275,7 @@ public class ScummVM implements SurfaceHolder.Callback {
 						break;
 					} else if (ret != len) {
 						Log.w(LOG_TAG, String.format(
-							"Short audio write.  Wrote %dB, not %dB",
+							"Short audio write.	 Wrote %dB, not %dB",
 							ret, buf.length));
 						// Buffer is full, so yield cpu for a while
 						Thread.sleep(100);