Distorted Android

// Copyright 2019 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                          //

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

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

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

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

import android.app.ActivityManager;

import android.opengl.GLSurfaceView;

import org.distorted.library.effect.VertexEffectSink;

import org.distorted.library.main.DistortedLibrary;

import org.distorted.library.main.DistortedScreen;

import org.distorted.library.message.EffectListener;

import org.distorted.library.type.Static3D;

import java.io.InputStream;

import javax.microedition.khronos.egl.EGLConfig;

class RubikRenderer implements GLSurfaceView.Renderer, EffectListener, DistortedLibrary.LibraryUser

{

    private static final float CUBE_SCREEN_RATIO = 0.5f;

    private static final float CAMERA_DISTANCE   = 0.6f;  // 0.6 of the length of max(scrHeight,scrWidth)

    private static final int MIN_CUBE_SIZE = 1;

    private final RubikSurfaceView mView;

    private int mNextCubeSize;

    private boolean mChangeCubeSizeNow;

    private int mScreenWidth, mScreenHeight;

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

    RubikRenderer(RubikSurfaceView v)

      {

      mResources = v.getResources();

      mScreen = new DistortedScreen();

      mScreenWidth = mScreenHeight = 0;

      mScale = new Static3D(1,1,1);

      mNextCubeSize= MIN_CUBE_SIZE;

      mNumCube = 0;

      }

// change the cube size here, 'after the next render' as not to cause artifacts.

    public void onDrawFrame(GL10 glUnused) 

      if( mChangeCubeSizeNow )

        {

        mChangeCubeSizeNow = false;

        }

      }

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

   public void effectFinished(final long effectID)

     {

     mNextCubeSize++;

     }

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

   public void onSurfaceChanged(GL10 glUnused, int width, int height)

     float cameraDistance = CAMERA_DISTANCE*(Math.max(width,height));

     float fovInDegrees   = computeFOV(cameraDistance,height);

     mScreen.setProjection( fovInDegrees, 0.1f);

     recomputeScaleFactor(width,height);

     mScreenHeight = height;

   public void onSurfaceCreated(GL10 glUnused, EGLConfig config)

     DistortedLibrary.onSurfaceCreated(this);

     }

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

   private void createNextCube()

     {

     if( mCube!=null ) mCube.releaseResources();

     mCube = new RubikCube(mNextCubeSize, mScale);

     mCube.createTexture();

     if( mScreenWidth!=0 ) recomputeScaleFactor(mScreenWidth,mScreenHeight);

     mScreen.detachAll();

     }

   private float computeFOV(float cameraDistance, int screenHeight)

     {

     double halfFOVInRadians = Math.atan( screenHeight/(2*cameraDistance) );

     }

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

   private void recomputeScaleFactor(int screenWidth, int screenHeight)

     {

     float scaleFactor = CUBE_SCREEN_RATIO * Math.min(screenWidth,screenHeight) / mCube.getSize();

     mScale.set(scaleFactor,scaleFactor,scaleFactor);

}