Add BasicGLSurfaceView sample.

Show how to get started with OpenGL ES 2.0.

Change-Id: Iee83ca6a52eee64e8c6b77bc9a8abff11a1eabfd

samples/BasicGLSurfaceView/Android.mk

@@ -0,0 +1,13 @@
+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_TAGS := samples
+
+# Only compile source java files in this apk.
+LOCAL_SRC_FILES := $(call all-java-files-under, src)
+
+LOCAL_PACKAGE_NAME := BasicGLSurfaceView
+
+LOCAL_SDK_VERSION := current
+
+include $(BUILD_PACKAGE)

samples/BasicGLSurfaceView/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2011, 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.
+*/
+-->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.example.android.basicglsurfaceview">
+    <uses-feature android:glEsVersion="0x00020000" />
+    <application
+            android:label="@string/app_name">
+        <activity android:name="BasicGLSurfaceViewActivity"
+                android:theme="@android:style/Theme.NoTitleBar.Fullscreen"
+                android:launchMode="singleTask"
+                android:configChanges="orientation|keyboardHidden">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

samples/BasicGLSurfaceView/res/values/strings.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2011, 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.
+*/
+-->
+
+<!-- This file contains resource definitions for displayed strings, allowing
+     them to be changed based on the locale and options. -->
+
+<resources>
+    <!-- Simple strings. -->
+    <string name="app_name">Basic GLSurfaceView</string>
+
+</resources>
+

samples/BasicGLSurfaceView/src/com/example/android/basicglsurfaceview/BasicGLSurfaceView.java

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+/*
+ * Copyright (C) 2011 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.example.android.basicglsurfaceview;
+
+import android.content.Context;
+import android.opengl.GLSurfaceView;
+
+import android.opengl.GLES20;
+
+class BasicGLSurfaceView extends GLSurfaceView {
+    public BasicGLSurfaceView(Context context) {
+        super(context);
+        setEGLContextClientVersion(2);
+        setRenderer(new GLES20TriangleRenderer(context));
+    }
+}
+

samples/BasicGLSurfaceView/src/com/example/android/basicglsurfaceview/BasicGLSurfaceViewActivity.java

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+/*
+ * Copyright (C) 2011 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.example.android.basicglsurfaceview;
+
+import android.app.Activity;
+import android.os.Bundle;
+import android.view.WindowManager;
+
+import java.io.File;
+
+
+public class BasicGLSurfaceViewActivity extends Activity {
+
+    private BasicGLSurfaceView mView;
+
+    @Override
+    protected void onCreate(Bundle icicle) {
+        super.onCreate(icicle);
+        mView = new BasicGLSurfaceView(getApplication());
+        setContentView(mView);
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+        mView.onPause();
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        mView.onResume();
+    }
+}

samples/BasicGLSurfaceView/src/com/example/android/basicglsurfaceview/GLES20TriangleRenderer.java

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+/*
+ * Copyright (C) 2011 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.example.android.basicglsurfaceview;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.nio.FloatBuffer;
+
+import javax.microedition.khronos.egl.EGLConfig;
+import javax.microedition.khronos.opengles.GL10;
+
+import android.content.Context;
+import android.graphics.Bitmap;
+import android.graphics.BitmapFactory;
+import android.opengl.GLES20;
+import android.opengl.GLSurfaceView;
+import android.opengl.GLUtils;
+import android.opengl.Matrix;
+import android.os.SystemClock;
+import android.util.Log;
+
+class GLES20TriangleRenderer implements GLSurfaceView.Renderer {
+
+    public GLES20TriangleRenderer(Context context) {
+        mContext = context;
+        mTriangleVertices = ByteBuffer.allocateDirect(mTriangleVerticesData.length
+                * FLOAT_SIZE_BYTES).order(ByteOrder.nativeOrder()).asFloatBuffer();
+        mTriangleVertices.put(mTriangleVerticesData).position(0);
+    }
+
+    public void onDrawFrame(GL10 glUnused) {
+        // Ignore the passed-in GL10 interface, and use the GLES20
+        // class's static methods instead.
+        GLES20.glClearColor(0.0f, 0.0f, 1.0f, 1.0f);
+        GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);
+        GLES20.glUseProgram(mProgram);
+        checkGlError("glUseProgram");
+
+        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);
+
+        mTriangleVertices.position(TRIANGLE_VERTICES_DATA_POS_OFFSET);
+        GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false,
+                TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
+        checkGlError("glVertexAttribPointer maPosition");
+        mTriangleVertices.position(TRIANGLE_VERTICES_DATA_UV_OFFSET);
+        GLES20.glEnableVertexAttribArray(maPositionHandle);
+        checkGlError("glEnableVertexAttribArray maPositionHandle");
+        GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false,
+                TRIANGLE_VERTICES_DATA_STRIDE_BYTES, mTriangleVertices);
+        checkGlError("glVertexAttribPointer maTextureHandle");
+        GLES20.glEnableVertexAttribArray(maTextureHandle);
+        checkGlError("glEnableVertexAttribArray maTextureHandle");
+
+        long time = SystemClock.uptimeMillis() % 4000L;
+        float angle = 0.090f * ((int) time);
+        Matrix.setRotateM(mMMatrix, 0, angle, 0, 0, 1.0f);
+        Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, mMMatrix, 0);
+        Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);
+
+        GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
+        GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
+        checkGlError("glDrawArrays");
+    }
+
+    public void onSurfaceChanged(GL10 glUnused, int width, int height) {
+        // Ignore the passed-in GL10 interface, and use the GLES20
+        // class's static methods instead.
+        GLES20.glViewport(0, 0, width, height);
+        float ratio = (float) width / height;
+        Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
+    }
+
+    public void onSurfaceCreated(GL10 glUnused, EGLConfig config) {
+        // Ignore the passed-in GL10 interface, and use the GLES20
+        // class's static methods instead.
+        mProgram = createProgram(mVertexShader, mFragmentShader);
+        if (mProgram == 0) {
+            return;
+        }
+        maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
+        checkGlError("glGetAttribLocation aPosition");
+        if (maPositionHandle == -1) {
+            throw new RuntimeException("Could not get attrib location for aPosition");
+        }
+        maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
+        checkGlError("glGetAttribLocation aTextureCoord");
+        if (maTextureHandle == -1) {
+            throw new RuntimeException("Could not get attrib location for aTextureCoord");
+        }
+
+        muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
+        checkGlError("glGetUniformLocation uMVPMatrix");
+        if (muMVPMatrixHandle == -1) {
+            throw new RuntimeException("Could not get attrib location for uMVPMatrix");
+        }
+
+        /*
+         * Create our texture. This has to be done each time the
+         * surface is created.
+         */
+
+        int[] textures = new int[1];
+        GLES20.glGenTextures(1, textures, 0);
+
+        mTextureID = textures[0];
+        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextureID);
+
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER,
+                GLES20.GL_NEAREST);
+        GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
+                GLES20.GL_TEXTURE_MAG_FILTER,
+                GLES20.GL_LINEAR);
+
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
+                GLES20.GL_REPEAT);
+        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
+                GLES20.GL_REPEAT);
+
+        InputStream is = mContext.getResources()
+            .openRawResource(R.raw.robot);
+        Bitmap bitmap;
+        try {
+            bitmap = BitmapFactory.decodeStream(is);
+        } finally {
+            try {
+                is.close();
+            } catch(IOException e) {
+                // Ignore.
+            }
+        }
+
+        GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bitmap, 0);
+        bitmap.recycle();
+
+        Matrix.setLookAtM(mVMatrix, 0, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
+    }
+
+    private int loadShader(int shaderType, String source) {
+        int shader = GLES20.glCreateShader(shaderType);
+        if (shader != 0) {
+            GLES20.glShaderSource(shader, source);
+            GLES20.glCompileShader(shader);
+            int[] compiled = new int[1];
+            GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
+            if (compiled[0] == 0) {
+                Log.e(TAG, "Could not compile shader " + shaderType + ":");
+                Log.e(TAG, GLES20.glGetShaderInfoLog(shader));
+                GLES20.glDeleteShader(shader);
+                shader = 0;
+            }
+        }
+        return shader;
+    }
+
+    private int createProgram(String vertexSource, String fragmentSource) {
+        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
+        if (vertexShader == 0) {
+            return 0;
+        }
+
+        int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
+        if (pixelShader == 0) {
+            return 0;
+        }
+
+        int program = GLES20.glCreateProgram();
+        if (program != 0) {
+            GLES20.glAttachShader(program, vertexShader);
+            checkGlError("glAttachShader");
+            GLES20.glAttachShader(program, pixelShader);
+            checkGlError("glAttachShader");
+            GLES20.glLinkProgram(program);
+            int[] linkStatus = new int[1];
+            GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
+            if (linkStatus[0] != GLES20.GL_TRUE) {
+                Log.e(TAG, "Could not link program: ");
+                Log.e(TAG, GLES20.glGetProgramInfoLog(program));
+                GLES20.glDeleteProgram(program);
+                program = 0;
+            }
+        }
+        return program;
+    }
+
+    private void checkGlError(String op) {
+        int error;
+        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
+            Log.e(TAG, op + ": glError " + error);
+            throw new RuntimeException(op + ": glError " + error);
+        }
+    }
+
+    private static final int FLOAT_SIZE_BYTES = 4;
+    private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
+    private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
+    private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
+    private final float[] mTriangleVerticesData = {
+            // X, Y, Z, U, V
+            -1.0f, -0.5f, 0, -0.5f, 0.0f,
+            1.0f, -0.5f, 0, 1.5f, -0.0f,
+            0.0f,  1.11803399f, 0, 0.5f,  1.61803399f };
+
+    private FloatBuffer mTriangleVertices;
+
+    private final String mVertexShader =
+        "uniform mat4 uMVPMatrix;\n" +
+        "attribute vec4 aPosition;\n" +
+        "attribute vec2 aTextureCoord;\n" +
+        "varying vec2 vTextureCoord;\n" +
+        "void main() {\n" +
+        "  gl_Position = uMVPMatrix * aPosition;\n" +
+        "  vTextureCoord = aTextureCoord;\n" +
+        "}\n";
+
+    private final String mFragmentShader =
+        "precision mediump float;\n" +
+        "varying vec2 vTextureCoord;\n" +
+        "uniform sampler2D sTexture;\n" +
+        "void main() {\n" +
+        "  gl_FragColor = texture2D(sTexture, vTextureCoord);\n" +
+        "}\n";
+
+    private float[] mMVPMatrix = new float[16];
+    private float[] mProjMatrix = new float[16];
+    private float[] mMMatrix = new float[16];
+    private float[] mVMatrix = new float[16];
+
+    private int mProgram;
+    private int mTextureID;
+    private int muMVPMatrixHandle;
+    private int maPositionHandle;
+    private int maTextureHandle;
+
+    private Context mContext;
+    private static String TAG = "GLES20TriangleRenderer";
+}