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      1 package com.example.android.rs.nbody_gl;
      2 
      3 import javax.microedition.khronos.egl.EGLConfig;
      4 import javax.microedition.khronos.opengles.GL10;
      5 
      6 import android.content.Context;
      7 import android.opengl.GLES20;
      8 import android.opengl.GLSurfaceView;
      9 import android.opengl.Matrix;
     10 import android.util.Log;
     11 import android.view.KeyEvent;
     12 import android.view.MotionEvent;
     13 
     14 public class BasicGLRenderer implements GLSurfaceView.Renderer {
     15 
     16     private static final String TAG = "BasicGLRenderer";
     17     private Swarm mSwarm;
     18     Context mContext;
     19     private final float[] mMVPMatrix = new float[16];
     20     private final float[] mProjectionMatrix = new float[16];
     21     private final float[] mViewMatrix = new float[16];
     22     private final float[] mRotationMatrix = new float[16];
     23     private float mAngle;
     24 
     25     GLSurfaceView mGLSurfaceView;
     26 
     27     public BasicGLRenderer(Context context, GLSurfaceView view) {
     28         mContext = context;
     29         mGLSurfaceView = view;
     30     }
     31 
     32     @Override
     33     public void onSurfaceCreated(GL10 unused, EGLConfig config) {
     34         GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
     35         GLES20.glEnable(GLES20.GL_DEPTH_TEST);
     36 
     37         if (mSwarm != null) {
     38             mSwarm.onPause();
     39         }
     40         mSwarm = new Swarm(mContext, mGLSurfaceView);
     41         mSwarm.onSurfaceCreated();
     42         mSwarm.onResume();
     43     }
     44 
     45     @Override
     46     public void onDrawFrame(GL10 unused) {
     47         float[] scratch = new float[16];
     48 
     49         GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
     50         Matrix.setLookAtM(mViewMatrix, 0,
     51                 0, 0, -3, 0f,
     52                 0f, 0f, 0f,
     53                 1.0f, 0.0f);
     54         Matrix.multiplyMM(mMVPMatrix, 0, mProjectionMatrix, 0, mViewMatrix, 0);
     55 
     56         mSwarm.draw(mMVPMatrix);
     57 
     58         Matrix.setRotateM(mRotationMatrix, 0, mAngle, 0, 0, 1.0f);
     59         Matrix.multiplyMM(scratch, 0, mMVPMatrix, 0, mRotationMatrix, 0);
     60 
     61     }
     62 
     63     @Override
     64     public void onSurfaceChanged(GL10 unused, int width, int height) {
     65         GLES20.glViewport(0, 0, width, height);
     66         float ratio = (float) width / height;
     67         Matrix.frustumM(mProjectionMatrix, 0, -ratio / 10, ratio / 10, -.1f, .1f, .1f, 200);
     68     }
     69 
     70     public static int loadShader(int type, String shaderCode) {
     71         int shader = GLES20.glCreateShader(type);
     72         GLES20.glShaderSource(shader, shaderCode);
     73         GLES20.glCompileShader(shader);
     74 
     75         return shader;
     76     }
     77 
     78     public static void checkGlError(String glOperation) {
     79         int error;
     80         while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
     81             Log.e(TAG, glOperation + ": glError " + error);
     82             throw new RuntimeException(glOperation + ": glError " + error);
     83         }
     84     }
     85 
     86     public float getAngle() {
     87         return mAngle;
     88     }
     89 
     90     public void setAngle(float angle) {
     91         mAngle = angle;
     92     }
     93 
     94     public void onResume() {
     95         if (mSwarm != null) {
     96             mSwarm.onResume();
     97         }
     98     }
     99 
    100     public void onPause() {
    101         if (mSwarm != null) {
    102             mSwarm.onPause();
    103         }
    104     }
    105 
    106     public void onTouchEvent(MotionEvent e) {
    107         mSwarm.onTouchEvent(e);
    108     }
    109 
    110     public void onJoystick(float dx, float dy) {
    111         mSwarm.onJoystick(dx, dy);
    112     }
    113 
    114     public void onKeyDown(int keyCode, KeyEvent event) {
    115 
    116         mSwarm.onKeyDown(keyCode, event);
    117     }
    118 }