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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package org.distorted.library.main;

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import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.opengl.GLES31;

import org.distorted.library.effect.MatrixEffectMove;

import org.distorted.library.mesh.MeshBase;

import org.distorted.library.mesh.MeshFlat;

import org.distorted.library.type.Static3D;

/**

 * Class which represents the Screen.

 * <p>

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

 */

public class DistortedScreen extends DistortedFramebuffer

  {

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

  private boolean mShowFPS;

  private static final int NUM_FRAMES  = 100;

  private MeshBase 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;

  private static MatrixEffectMove mMoveEffect = new MatrixEffectMove( new Static3D(5,5,0) );

  ///// END DEBUGGING //////////////////////////

  private int mCurRenderedFBO;    // During the first FBO_QUEUE_SIZE frames, we blit the very first

  private int mToBeBlittedFBO;    // FBO one we have rendered. Then, we keep blitting the one we

  private boolean mFirstCircle;   // rendered FBO_QUEUE_SIZE ago.

///////////////////////////////////////////////////////////////////////////////////////////////////

// PUBLIC API

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Create a new Screen. Initially 1x1 in size.

 * <p>

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

 */

  public DistortedScreen()

    {

    super(Distorted.FBO_QUEUE_SIZE,1,BOTH_DEPTH_STENCIL, TYPE_SYST, 1,1);

    mShowFPS = false;

    mCurRenderedFBO = 0;

    mToBeBlittedFBO = 0;

    mFirstCircle = true;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Draws all the attached children to this OutputSurface.

 * <p>

 * Must be called from a thread holding OpenGL Context.

 *

 * @param time Current time, in milliseconds. This will be passed to all the Effects stored in the children Nodes.

 * @return Number of objects rendered.

 */

  public int render(long time)

    {

    if( mShowFPS )

      {

      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;

      }

    int numrender = super.render(time,mCurRenderedFBO);

    GLES31.glBindFramebuffer(GLES31.GL_FRAMEBUFFER, 0);

    // workaround for the Mali issues: blit the framebuffer we have computed Distorted.FBO_QUEUE_SIZE

    // frames ago. Looks like FBO_QUEUE_SIZE=2 solves the issue already but I decided to play it safe and

    // make it equal to 3.

    // This of course introduces a delay and uses more memory, but it does not appear to have any effect

    // on speed. Maybe a slight positive effect if any!

    setAsInput(mToBeBlittedFBO,0);

    GLES31.glColorMask(true,true,true,true);

    GLES31.glDepthMask(false);

    GLES31.glDisable(GLES31.GL_STENCIL_TEST);

    GLES31.glDisable(GLES31.GL_DEPTH_TEST);

    GLES31.glDisable(GLES31.GL_BLEND);

    DistortedEffects.blitPriv(this);

    if( mShowFPS && fpsTexture.setAsInput())

      {

      fpsEffects.drawPriv(fpsW / 2.0f, fpsH / 2.0f, fpsMesh, this, time);

      }

    if( ++mCurRenderedFBO>=Distorted.FBO_QUEUE_SIZE )

      {

      mCurRenderedFBO = 0;

      if (mFirstCircle) mFirstCircle = false;

      }

    if( !mFirstCircle && ++mToBeBlittedFBO>=Distorted.FBO_QUEUE_SIZE )

      {

      mToBeBlittedFBO=0;

      }

    return numrender+1;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Make the library show Frames Per Second in the upper-left corner.

 * <p>

 */

  public void showFPS()

    {

    if( !mShowFPS )

      {

      mShowFPS = true;

      fpsW = 120;

      fpsH = 70;

      fpsString = "";

      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.apply(mMoveEffect);

      mPaint = new Paint();

      mPaint.setAntiAlias(true);

      mPaint.setTextAlign(Paint.Align.CENTER);

      mPaint.setTextSize(0.7f * fpsH);

      durations = new long[NUM_FRAMES + 1];

      currDuration = 0;

      for (int i = 0; i < NUM_FRAMES + 1; i++) durations[i] = 16;  // Assume FPS will be

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

      }

    }

  }