path: root/backends/gdx-backend-android/src/com/badlogic/gdx/backends/android/surfaceview/GLSurfaceView20API18.java

/*
 * Copyright (C) 2009 The Android Open Source Project
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the
 * License. You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS"
 * BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

package com.badlogic.gdx.backends.android.surfaceview;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.egl.EGLContext;
import javax.microedition.khronos.egl.EGLDisplay;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.PixelFormat;
import android.opengl.GLSurfaceView;
import android.os.SystemClock;
import android.util.Log;
import android.view.KeyCharacterMap;
import android.view.KeyEvent;
import android.view.inputmethod.BaseInputConnection;
import android.view.inputmethod.EditorInfo;
import android.view.inputmethod.InputConnection;

/** <b>This class is a slightly modified copy of GLSurfaceView20 which extends GLSurfaceViewAPI18 instead of the classic GLSurfaceView. 
 * Especially it is intended to be used on Android 2.x if you need proper support for onAttachedToWindow and onDetachedFromWindow methods.<b>
 * <p>It demonstrates how to perform OpenGL ES 2.0 rendering into a GL Surface. Note the following important details:
 * <p/>
 * - The class must use a custom context factory to enable 2.0 rendering. See ContextFactory class definition below.
 * <p/>
 * - The class must use a custom EGLConfigChooser to be able to select an EGLConfig that supports 2.0. This is done by providing a
 * config specification to eglChooseConfig() that has the attribute EGL10.ELG_RENDERABLE_TYPE containing the EGL_OPENGL_ES2_BIT
 * flag set. See ConfigChooser class definition below.
 * <p/>
 * - The class must select the surface's format, then choose an EGLConfig that matches it exactly (with regards to
 * red/green/blue/alpha channels bit depths). Failure to do so would result in an EGL_BAD_MATCH error. */
public class GLSurfaceView20API18 extends GLSurfaceViewAPI18 {
	static String TAG = "GL2JNIView";
	private static final boolean DEBUG = false;

	final ResolutionStrategy resolutionStrategy;

	public GLSurfaceView20API18 (Context context, ResolutionStrategy resolutionStrategy) {
		super(context);
		this.resolutionStrategy = resolutionStrategy;
		init(false, 16, 0);
	}

	public GLSurfaceView20API18 (Context context, boolean translucent, int depth, int stencil, ResolutionStrategy resolutionStrategy) {
		super(context);
		this.resolutionStrategy = resolutionStrategy;
		init(translucent, depth, stencil);

	}

	@Override
	protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) {
		ResolutionStrategy.MeasuredDimension measures = resolutionStrategy.calcMeasures(widthMeasureSpec, heightMeasureSpec);
		setMeasuredDimension(measures.width, measures.height);
	}

	@Override
	public InputConnection onCreateInputConnection (EditorInfo outAttrs) {

		// add this line, the IME can show the selectable words when use chinese input method editor.
		if (outAttrs != null) {
			outAttrs.imeOptions = outAttrs.imeOptions | EditorInfo.IME_FLAG_NO_EXTRACT_UI;
		}
		
		BaseInputConnection connection = new BaseInputConnection(this, false) {
			@Override
			public boolean deleteSurroundingText (int beforeLength, int afterLength) {
				int sdkVersion = android.os.Build.VERSION.SDK_INT;
				if (sdkVersion >= 16) {
					/*
					 * In Jelly Bean, they don't send key events for delete. Instead, they send beforeLength = 1, afterLength = 0. So,
					 * we'll just simulate what it used to do.
					 */
					if (beforeLength == 1 && afterLength == 0) {
						sendDownUpKeyEventForBackwardCompatibility(KeyEvent.KEYCODE_DEL);
						return true;
					}
				}
				return super.deleteSurroundingText(beforeLength, afterLength);
			}

			@TargetApi(16)
			private void sendDownUpKeyEventForBackwardCompatibility (final int code) {
				final long eventTime = SystemClock.uptimeMillis();
				super.sendKeyEvent(new KeyEvent(eventTime, eventTime, KeyEvent.ACTION_DOWN, code, 0, 0,
					KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
				super.sendKeyEvent(new KeyEvent(SystemClock.uptimeMillis(), eventTime, KeyEvent.ACTION_UP, code, 0, 0,
					KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
			}
		};
		return connection;
	}

	private void init (boolean translucent, int depth, int stencil) {

		/*
		 * By default, GLSurfaceView() creates a RGB_565 opaque surface. If we want a translucent one, we should change the
		 * surface's format here, using PixelFormat.TRANSLUCENT for GL Surfaces is interpreted as any 32-bit surface with alpha by
		 * SurfaceFlinger.
		 */
		if (translucent) {
			this.getHolder().setFormat(PixelFormat.TRANSLUCENT);
		}

		/*
		 * Setup the context factory for 2.0 rendering. See ContextFactory class definition below
		 */
		setEGLContextFactory(new ContextFactory());

		/*
		 * We need to choose an EGLConfig that matches the format of our surface exactly. This is going to be done in our custom
		 * config chooser. See ConfigChooser class definition below.
		 */
		setEGLConfigChooser(translucent ? new ConfigChooser(8, 8, 8, 8, depth, stencil) : new ConfigChooser(5, 6, 5, 0, depth,
			stencil));

		/* Set the renderer responsible for frame rendering */
	}

	static class ContextFactory implements GLSurfaceViewAPI18.EGLContextFactory {
		private static int EGL_CONTEXT_CLIENT_VERSION = 0x3098;

		public EGLContext createContext (EGL10 egl, EGLDisplay display, EGLConfig eglConfig) {
			Log.w(TAG, "creating OpenGL ES 2.0 context");
			checkEglError("Before eglCreateContext", egl);
			int[] attrib_list = {EGL_CONTEXT_CLIENT_VERSION, 2,
					GLSurfaceView20.EGL_CONTEXT_PRIORITY_LEVEL_IMG, GLSurfaceView20.EGL_CONTEXT_PRIORITY_LOW_IMG,
					EGL10.EGL_NONE};
			EGLContext context = egl.eglCreateContext(display, eglConfig, EGL10.EGL_NO_CONTEXT, attrib_list);
			checkEglError("After eglCreateContext", egl);
			return context;
		}

		public void destroyContext (EGL10 egl, EGLDisplay display, EGLContext context) {
			egl.eglDestroyContext(display, context);
		}
	}

	static void checkEglError (String prompt, EGL10 egl) {
		int error;
		while ((error = egl.eglGetError()) != EGL10.EGL_SUCCESS) {
			Log.e(TAG, String.format("%s: EGL error: 0x%x", prompt, error));
		}
	}

	private static class ConfigChooser implements GLSurfaceView.EGLConfigChooser {

		public ConfigChooser (int r, int g, int b, int a, int depth, int stencil) {
			mRedSize = r;
			mGreenSize = g;
			mBlueSize = b;
			mAlphaSize = a;
			mDepthSize = depth;
			mStencilSize = stencil;
		}

		/*
		 * This EGL config specification is used to specify 2.0 rendering. We use a minimum size of 4 bits for red/green/blue, but
		 * will perform actual matching in chooseConfig() below.
		 */
		private static int EGL_OPENGL_ES2_BIT = 4;
		private static int[] s_configAttribs2 = {EGL10.EGL_RED_SIZE, 4, EGL10.EGL_GREEN_SIZE, 4, EGL10.EGL_BLUE_SIZE, 4,
			EGL10.EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT, EGL10.EGL_NONE};

		public EGLConfig chooseConfig (EGL10 egl, EGLDisplay display) {

			/*
			 * Get the number of minimally matching EGL configurations
			 */
			int[] num_config = new int[1];
			egl.eglChooseConfig(display, s_configAttribs2, null, 0, num_config);

			int numConfigs = num_config[0];

			if (numConfigs <= 0) {
				throw new IllegalArgumentException("No configs match configSpec");
			}

			/*
			 * Allocate then read the array of minimally matching EGL configs
			 */
			EGLConfig[] configs = new EGLConfig[numConfigs];
			egl.eglChooseConfig(display, s_configAttribs2, configs, numConfigs, num_config);

			if (DEBUG) {
				printConfigs(egl, display, configs);
			}
			/*
			 * Now return the "best" one
			 */
			return chooseConfig(egl, display, configs);
		}

		public EGLConfig chooseConfig (EGL10 egl, EGLDisplay display, EGLConfig[] configs) {
			for (EGLConfig config : configs) {
				int d = findConfigAttrib(egl, display, config, EGL10.EGL_DEPTH_SIZE, 0);
				int s = findConfigAttrib(egl, display, config, EGL10.EGL_STENCIL_SIZE, 0);

				// We need at least mDepthSize and mStencilSize bits
				if (d < mDepthSize || s < mStencilSize) continue;

				// We want an *exact* match for red/green/blue/alpha
				int r = findConfigAttrib(egl, display, config, EGL10.EGL_RED_SIZE, 0);
				int g = findConfigAttrib(egl, display, config, EGL10.EGL_GREEN_SIZE, 0);
				int b = findConfigAttrib(egl, display, config, EGL10.EGL_BLUE_SIZE, 0);
				int a = findConfigAttrib(egl, display, config, EGL10.EGL_ALPHA_SIZE, 0);

				if (r == mRedSize && g == mGreenSize && b == mBlueSize && a == mAlphaSize) return config;
			}
			return null;
		}

		private int findConfigAttrib (EGL10 egl, EGLDisplay display, EGLConfig config, int attribute, int defaultValue) {

			if (egl.eglGetConfigAttrib(display, config, attribute, mValue)) {
				return mValue[0];
			}
			return defaultValue;
		}

		private void printConfigs (EGL10 egl, EGLDisplay display, EGLConfig[] configs) {
			int numConfigs = configs.length;
			Log.w(TAG, String.format("%d configurations", numConfigs));
			for (int i = 0; i < numConfigs; i++) {
				Log.w(TAG, String.format("Configuration %d:\n", i));
				printConfig(egl, display, configs[i]);
			}
		}

		private void printConfig (EGL10 egl, EGLDisplay display, EGLConfig config) {
			int[] attributes = {EGL10.EGL_BUFFER_SIZE, EGL10.EGL_ALPHA_SIZE, EGL10.EGL_BLUE_SIZE, EGL10.EGL_GREEN_SIZE,
				EGL10.EGL_RED_SIZE, EGL10.EGL_DEPTH_SIZE, EGL10.EGL_STENCIL_SIZE, EGL10.EGL_CONFIG_CAVEAT, EGL10.EGL_CONFIG_ID,
				EGL10.EGL_LEVEL, EGL10.EGL_MAX_PBUFFER_HEIGHT, EGL10.EGL_MAX_PBUFFER_PIXELS, EGL10.EGL_MAX_PBUFFER_WIDTH,
				EGL10.EGL_NATIVE_RENDERABLE, EGL10.EGL_NATIVE_VISUAL_ID, EGL10.EGL_NATIVE_VISUAL_TYPE,
				0x3030, // EGL10.EGL_PRESERVED_RESOURCES,
				EGL10.EGL_SAMPLES, EGL10.EGL_SAMPLE_BUFFERS, EGL10.EGL_SURFACE_TYPE, EGL10.EGL_TRANSPARENT_TYPE,
				EGL10.EGL_TRANSPARENT_RED_VALUE, EGL10.EGL_TRANSPARENT_GREEN_VALUE, EGL10.EGL_TRANSPARENT_BLUE_VALUE, 0x3039, // EGL10.EGL_BIND_TO_TEXTURE_RGB,
				0x303A, // EGL10.EGL_BIND_TO_TEXTURE_RGBA,
				0x303B, // EGL10.EGL_MIN_SWAP_INTERVAL,
				0x303C, // EGL10.EGL_MAX_SWAP_INTERVAL,
				EGL10.EGL_LUMINANCE_SIZE, EGL10.EGL_ALPHA_MASK_SIZE, EGL10.EGL_COLOR_BUFFER_TYPE, EGL10.EGL_RENDERABLE_TYPE, 0x3042 // EGL10.EGL_CONFORMANT
			};
			String[] names = {"EGL_BUFFER_SIZE", "EGL_ALPHA_SIZE", "EGL_BLUE_SIZE", "EGL_GREEN_SIZE", "EGL_RED_SIZE",
				"EGL_DEPTH_SIZE", "EGL_STENCIL_SIZE", "EGL_CONFIG_CAVEAT", "EGL_CONFIG_ID", "EGL_LEVEL", "EGL_MAX_PBUFFER_HEIGHT",
				"EGL_MAX_PBUFFER_PIXELS", "EGL_MAX_PBUFFER_WIDTH", "EGL_NATIVE_RENDERABLE", "EGL_NATIVE_VISUAL_ID",
				"EGL_NATIVE_VISUAL_TYPE", "EGL_PRESERVED_RESOURCES", "EGL_SAMPLES", "EGL_SAMPLE_BUFFERS", "EGL_SURFACE_TYPE",
				"EGL_TRANSPARENT_TYPE", "EGL_TRANSPARENT_RED_VALUE", "EGL_TRANSPARENT_GREEN_VALUE", "EGL_TRANSPARENT_BLUE_VALUE",
				"EGL_BIND_TO_TEXTURE_RGB", "EGL_BIND_TO_TEXTURE_RGBA", "EGL_MIN_SWAP_INTERVAL", "EGL_MAX_SWAP_INTERVAL",
				"EGL_LUMINANCE_SIZE", "EGL_ALPHA_MASK_SIZE", "EGL_COLOR_BUFFER_TYPE", "EGL_RENDERABLE_TYPE", "EGL_CONFORMANT"};
			int[] value = new int[1];
			for (int i = 0; i < attributes.length; i++) {
				int attribute = attributes[i];
				String name = names[i];
				if (egl.eglGetConfigAttrib(display, config, attribute, value)) {
					Log.w(TAG, String.format("  %s: %d\n", name, value[0]));
				} else {
					// Log.w(TAG, String.format("  %s: failed\n", name));
					while (egl.eglGetError() != EGL10.EGL_SUCCESS)
						;
				}
			}
		}

		// Subclasses can adjust these values:
		protected int mRedSize;
		protected int mGreenSize;
		protected int mBlueSize;
		protected int mAlphaSize;
		protected int mDepthSize;
		protected int mStencilSize;
		private int[] mValue = new int[1];
	}
}