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/>.                            //

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

package org.distorted.library.main;

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

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.opengl.GLES30;

import org.distorted.library.effect.MatrixEffectMove;

import org.distorted.library.effect.MatrixEffectScale;

import org.distorted.library.mesh.MeshQuad;

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 static final int NUM_FRAMES  = 100;

  private static final int DEBUG_W     = 150;

  private static final int DEBUG_H     =  70;

  private static final int DEBUG_MODE_NONE = 0;

  private static final int DEBUG_MODE_FPS  = 1;

  private static final int DEBUG_MODE_FRAME= 2;

  private int mDebugMode;

  private boolean mDebugAllocated;

  private MeshQuad debugMesh;

  private DistortedTexture debugTexture;

  private DistortedEffects debugEffects;

  private Canvas debugCanvas;

  private Bitmap debugBitmap;

  private Paint mPaint;

  private String debugString;

  private long lastTime=0;

  private long[] durations;

  private int currDuration;

  private int frameNumber;

  private static Static3D mMoveVector = new Static3D(0,0,0);

  private static MatrixEffectMove mMoveEffect = new MatrixEffectMove(mMoveVector);

  ///// 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 'resizeFBO()' to set the size.

 */

  public DistortedScreen()

    {

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

    mDebugMode = DEBUG_MODE_NONE;

    mCurRenderedFBO = 0;

    mToBeBlittedFBO = 0;

    mFirstCircle = true;

    mDebugAllocated = false;

    }

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

   private void allocateDebug()

     {

     if( !mDebugAllocated )

       {

       mDebugAllocated = true;

       debugString = "";

       debugBitmap = Bitmap.createBitmap(DEBUG_W, DEBUG_H, Bitmap.Config.ARGB_8888);

       debugMesh = new MeshQuad();

       debugTexture = new DistortedTexture();

       debugTexture.setTexture(debugBitmap);

       debugCanvas = new Canvas(debugBitmap);

       debugEffects = new DistortedEffects();

       debugEffects.apply( new MatrixEffectScale( new Static3D(DEBUG_W,DEBUG_H,1) ) );

       debugEffects.apply(mMoveEffect);

       mPaint = new Paint();

       mPaint.setAntiAlias(true);

       mPaint.setTextAlign(Paint.Align.CENTER);

       mPaint.setTextSize(0.7f * DEBUG_H);

       }

     }

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

/**

 * 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( mDebugMode!=DEBUG_MODE_NONE )

      {

      if( lastTime==0 ) lastTime = time;

      if( mDebugMode==DEBUG_MODE_FPS )

        {

        currDuration++;

        if (currDuration >= NUM_FRAMES) currDuration = 0;

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

        durations[currDuration] = time - lastTime;

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

        }

      else if( mDebugMode==DEBUG_MODE_FRAME )

        {

        debugString = "" + frameNumber;

        frameNumber++;

        }

      mPaint.setColor(0xffffffff);

      debugCanvas.drawRect(0, 0, DEBUG_W, DEBUG_H, mPaint);

      mPaint.setColor(0xff000000);

      debugCanvas.drawText(debugString, 0.5f*DEBUG_W, 0.75f*DEBUG_H, mPaint);

      debugTexture.setTexture(debugBitmap);

      mMoveVector.set( (-mWidth+DEBUG_W)/2 +5, (mHeight-DEBUG_H)/2 -5, 0);

      lastTime = time;

      }

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

    GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, 0);

    // workaround for the Mali issues: blit the framebuffer we have computed DistortedLibrary.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);

    GLES30.glColorMask(true,true,true,true);

    GLES30.glDepthMask(false);

    GLES30.glDisable(GLES30.GL_STENCIL_TEST);

    GLES30.glDisable(GLES30.GL_DEPTH_TEST);

    GLES30.glDisable(GLES30.GL_BLEND);

    DistortedLibrary.blitPriv(this);

    if( mDebugMode!=DEBUG_MODE_NONE && debugTexture.setAsInput())

      {

      DistortedLibrary.drawPriv(debugEffects, debugMesh, this, time);

      }

    if( ++mCurRenderedFBO>= DistortedLibrary.FBO_QUEUE_SIZE )

      {

      mCurRenderedFBO = 0;

      if (mFirstCircle) mFirstCircle = false;

      }

    if( !mFirstCircle && ++mToBeBlittedFBO>= DistortedLibrary.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( mDebugMode!=DEBUG_MODE_FPS )

      {

      allocateDebug();

      mDebugMode = DEBUG_MODE_FPS;

      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

      }

    }

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

/**

 * Make the library show current frame number in the upper-left corner.

 * <p>

 */

  public void showFrameNumber()

    {

    if( mDebugMode!=DEBUG_MODE_FRAME )

      {

      allocateDebug();

      mDebugMode = DEBUG_MODE_FRAME;

      frameNumber = 0;

      }

    }

  }