Stone Of Days

/*

 * 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.example.android.apis.graphics;



import android.app.Activity;

import android.app.ActivityManager;

import android.content.Context;

import android.content.pm.ConfigurationInfo;

import android.opengl.GLSurfaceView;

import android.os.Bundle;



/**

 * This sample shows how to check for OpenGL ES 2.0 support at runtime, and then

 * use either OpenGL ES 1.0 or OpenGL ES 2.0, as appropriate.

 */

public class GLES20Activity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        mGLSurfaceView = new GLSurfaceView(this);

        if (detectOpenGLES20()) {

            // Tell the surface view we want to create an OpenGL ES 2.0-compatible

            // context, and set an OpenGL ES 2.0-compatible renderer.

            mGLSurfaceView.setEGLContextClientVersion(2);

            mGLSurfaceView.setRenderer(new GLES20TriangleRenderer(this));

        } else {

            // Set an OpenGL ES 1.x-compatible renderer. In a real application

            // this renderer might approximate the same output as the 2.0 renderer.

            mGLSurfaceView.setRenderer(new TriangleRenderer(this));

        }

        setContentView(mGLSurfaceView);

    }



    private boolean detectOpenGLES20() {

        ActivityManager am =

            (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);

        ConfigurationInfo info = am.getDeviceConfigurationInfo();

        return (info.reqGlEsVersion >= 0x20000);

    }



    @Override

    protected void onResume() {

        // Ideally a game should implement onResume() and onPause()

        // to take appropriate action when the activity looses focus

        super.onResume();

        mGLSurfaceView.onResume();

    }



    @Override

    protected void onPause() {

        // Ideally a game should implement onResume() and onPause()

        // to take appropriate action when the activity looses focus

        super.onPause();

        mGLSurfaceView.onPause();

    }



    private GLSurfaceView mGLSurfaceView;

}

/*

 * 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.example.android.apis.graphics;



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;



import com.example.android.apis.R;



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";

}