Distorted Android

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// Copyright 2016 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// Distorted is free software: you can redistribute it and/or modify                             //

// it under the terms of the GNU General Public License as published by                          //

// the Free Software Foundation, either version 2 of the License, or                             //

// (at your option) any later version.                                                           //

//                                                                                               //

// Distorted is distributed in the hope that it will be useful,                                  //

// but WITHOUT ANY WARRANTY; without even the implied warranty of                                //

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                 //

// GNU General Public License for more details.                                                  //

//                                                                                               //

// You should have received a copy of the GNU General Public License                             //

// along with Distorted.  If not, see <http://www.gnu.org/licenses/>.                            //

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import android.app.ActivityManager;

import android.content.Context;

import android.content.pm.ConfigurationInfo;

import android.graphics.Canvas;

import android.graphics.Paint;

 * Class which represents the Screen.

 * <p>

 * User is able to render to it just like to a DistortedFramebuffer.

 */

  private static final int NUM_FRAMES  = 100;

  private MeshObject fpsMesh;

  private DistortedTexture fpsTexture;

  private DistortedEffects fpsEffects;

  private Canvas fpsCanvas;

  private Bitmap fpsBitmap;

  private Paint mPaint;

  private int fpsH, fpsW;

  private String fpsString = "";

  private long lastTime=0;

  private long[] durations;

  private int currDuration;

  void delete()   {}

  void prepareDebug(long time)

    {

    if( lastTime==0 ) lastTime = time;

    currDuration++;

    if (currDuration >= NUM_FRAMES) currDuration = 0;

    durations[NUM_FRAMES] += ((time - lastTime) - durations[currDuration]);

    durations[currDuration] = time - lastTime;

    fpsString = "" + ((int)(10000.0f*NUM_FRAMES/durations[NUM_FRAMES]))/10.0f;

    mPaint.setColor(0xffffffff);

    fpsCanvas.drawRect(0, 0, fpsW, fpsH, mPaint);

    mPaint.setColor(0xff000000);

    fpsCanvas.drawText(fpsString, fpsW/2, 0.75f*fpsH, mPaint);

    fpsTexture.setTexture(fpsBitmap);

    lastTime = time;

    }

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  void renderDebug(long time)

    {

    if (fpsTexture.setAsInput())

      {

      setAsOutput(time);

      GLES30.glDepthMask(false);

      GLES30.glDisable(GLES30.GL_STENCIL_TEST);

      GLES30.glDisable(GLES30.GL_DEPTH_TEST);

      }

    }

// PUBLIC API

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/**

 * Create a new Screen.

 * <p>

 * Has to be followed by a 'resize()' to set the size.

 */

    // set depth to 'CREATED' so that depth will be, by default, on.

    if( view!=null )

      {

      Context context = view.getContext();

      final ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

      final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();

      view.setEGLContextClientVersion((configurationInfo.reqGlEsVersion >> 16) >= 3 ? 3 : 2);

      }

    /////// DEBUGGING ONLY //////////////

    fpsW = 120;

    fpsH =  70;

    fpsBitmap = Bitmap.createBitmap(fpsW,fpsH, Bitmap.Config.ARGB_8888);

    fpsMesh = new MeshFlat(1,1);

    fpsTexture = new DistortedTexture(fpsW,fpsH);

    fpsTexture.setTexture(fpsBitmap);

    fpsCanvas = new Canvas(fpsBitmap);

    fpsEffects = new DistortedEffects();

    fpsEffects.move( new Static3D(5,5,0) );

    mPaint = new Paint();

    mPaint.setAntiAlias(true);

    mPaint.setTextAlign(Paint.Align.CENTER);

    mPaint.setTextSize(0.7f*fpsH);

    durations = new long[NUM_FRAMES+1];

    currDuration = 0;

    durations[NUM_FRAMES] = NUM_FRAMES*16;              // close to 1000/16 ~ 60

  }