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public class MyGLRenderer implements GLSurfaceView.Renderer
{
    private GameClock gameClock;
    private float elapsedTime;
    private Context context;
    private Camera camera;
 
    private ArrayList<StaticObject> maze;
    private Player player;
 
    private int mazeTexture;
    private int playerTexture;
 
    private TextureShaderProgram textureShaderProgram;
 
    private float[] projectionMatrix = new float[16];
    private float[] modelMatrix = new float[16];
    private float[] viewMatrix = new float[16];
    private float[] worldView = new float[16];
    private float[] worldViewProjection = new float[16];
    private float[] scalingMatrix = new float[16];
    private float[] rotationMatrix = new float[16];
    private float[] translationMatrix = new float[16];
    private float rotate = 0;
 
    public MyGLRenderer(Context context)
    {
        this.context = context;
        gameClock = new GameClock();
    }
 
    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config)
    {
        GLES20.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
        GLES20.glEnable(GLES20.GL_DEPTH_TEST);
 
        GLES20.glEnable(GLES20.GL_CULL_FACE); //Enables cull face
        GLES20.glCullFace(GLES20.GL_BACK); //specifies whether front- or back-facing polygons can be culled
        GLES20.glFrontFace(GLES20.GL_CCW); //defines the font facing polygon, whether they are drawn in CW order or CCW order.
 
        LoadShaderPrograms();
        LoadObjects();
 
        playerTexture = TextureHelper.loadTexture(context, R.drawable.chararacter);
        player = new Player(context, R.raw.character);
        camera = new Camera(player);
 
        gameClock.Initialize();
    }
 
    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height)
    {
        GLES20.glViewport(0, 0, width, height);
        Matrix.setIdentityM(worldViewProjection, 0);
        float aspectRatio;
        if(width > height)
        {
            aspectRatio = (float)width/(float)height;
            //Matrix.frustumM(projectionMatrix, 0, -aspectRatio, aspectRatio, -1, 1, 0.1f, 150);
            Matrix.perspectiveM(projectionMatrix, 0, 90, aspectRatio, 0.1f, 150);
        }
        else
        {
            aspectRatio = (float)height/(float)width;
            Matrix.perspectiveM(projectionMatrix, 0, 90, aspectRatio, 0.1f, 150);
            //Matrix.frustumM(projectionMatrix, 0, -1, 1, -aspectRatio, aspectRatio, 1, 150);
        }
        viewMatrix = camera.getViewMatrix();
    }
 
    @Override
    public void onDrawFrame(GL10 gl)
    {
        elapsedTime = gameClock.CalculateElapsedTime();
        System.out.println(elapsedTime);
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
        GLES20.glClear(GLES20.GL_DEPTH_BUFFER_BIT);
        drawPlayer();
        drawMaze();
        updateCamera();
    }
 
    private void drawMaze()
    {
        for(int a = 0; a < maze.size(); a++)
        {
            Matrix.setIdentityM(modelMatrix, 0);
            Matrix.multiplyMM(worldView, 0, viewMatrix, 0, modelMatrix, 0);
            Matrix.multiplyMM(worldViewProjection, 0, projectionMatrix, 0, worldView, 0);
 
            textureShaderProgram.useProgram();
            textureShaderProgram.setUniforms(worldViewProjection, mazeTexture);
 
            maze.get(a).bindData(textureShaderProgram);
            maze.get(a).draw();
        }
    }
 
    private void drawPlayer()
    {
 
        Matrix.setIdentityM(translationMatrix, 0);
        Vector3 playerWorldMidPoint = player.getWorldMidPoint();
        Matrix.translateM(translationMatrix, 0, playerWorldMidPoint.x, playerWorldMidPoint.y, playerWorldMidPoint.z);
        rotationMatrix = player.getIncrementalRotationMatrix();
 
        Matrix.multiplyMM(modelMatrix, 0, translationMatrix, 0, rotationMatrix, 0);
 
        Matrix.multiplyMM(worldView, 0, viewMatrix, 0, modelMatrix, 0);
        Matrix.multiplyMM(worldViewProjection, 0, projectionMatrix, 0, worldView, 0);
 
        textureShaderProgram.useProgram();
        textureShaderProgram.setUniforms(worldViewProjection, playerTexture);
 
        player.bindData(textureShaderProgram);
        player.draw();
        player.updatePlayerPosition(elapsedTime);
    }
 
    private void updateCamera()
    {
        camera.updateCamera();
        viewMatrix = camera.getViewMatrix();
    }
 
    private void LoadShaderPrograms()
    {
        textureShaderProgram = new TextureShaderProgram(context);
    }
 
    private void LoadObjects()
    {
        LoadMaze();
    }
 
    //I am loading in a wavefront file and the maze consists of several objects so I have to load them all since I stored them
    //separately.
    private void LoadMaze()
    {
        mazeTexture = TextureHelper.loadTexture(context, R.drawable.dark_texture);
        InputStream path = context.getResources().openRawResource(R.raw.maze);
        LoadOBJModel mazeOBJLoader = new LoadOBJModel();
        ArrayList<OBJFileData> mazeOBJFileData = mazeOBJLoader.LoadData(path);
        maze = new ArrayList<>();
        for(int a = 0; a < mazeOBJFileData.size(); a++)
        {
            maze.add(new StaticObject(mazeOBJFileData.get(a)));
        }
    }
}