Distorted Android

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

// Copyright 2016 Leszek Koltunski                                                               //

//                                                                                               //

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

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

//                                                                                               //

// 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                             //

package org.distorted.examples.stencil;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import org.distorted.examples.R;

import org.distorted.library.effect.MatrixEffectMove;

import org.distorted.library.effect.MatrixEffectRotate;

import org.distorted.library.effect.MatrixEffectScale;

import org.distorted.library.main.DistortedFramebuffer;

import org.distorted.library.main.DistortedNode;

import org.distorted.library.main.DistortedScreen;

import org.distorted.library.main.DistortedTexture;

import org.distorted.library.type.Static1D;

import org.distorted.library.type.Static3D;

import java.io.IOException;

import java.io.InputStream;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

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

class StencilRenderer implements GLSurfaceView.Renderer

{

    private GLSurfaceView mView;

    private DistortedScreen mScreen;

    private DistortedNode mCube1Node, mCube2Node, mFloorNode, mFBONode;

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

    void setScreen(boolean screen)

      {

      if( screen )

        {

        mScreen.detachAll();

        mScreen.attach(mCube1Node);

        mScreen.attach(mFloorNode);

        mScreen.attach(mCube2Node);

        }

      else

        {

        mScreen.detachAll();

        mScreen.attach(mFBONode);

        mFBONode.attach(mCube1Node);

        mFBONode.attach(mFloorNode);

        mFBONode.enableDepthStencil(DistortedFramebuffer.BOTH_DEPTH_STENCIL);

      }

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

    StencilRenderer(GLSurfaceView v)

      {

      mView = v;

      MeshQuad  quaFlo = new MeshQuad();

      MeshQuad  quaFBO = new MeshQuad();

      mFloorTex  = new DistortedTexture();

      mFBOTex    = new DistortedTexture();

      DistortedEffects cube2Effects = new DistortedEffects();

      DistortedEffects floorEffects = new DistortedEffects();

      DistortedEffects FBOEffects   = new DistortedEffects();

      mCube2Node = new DistortedNode(mCubeTex , cube2Effects, cube   );

      mFloorNode = new DistortedNode(mFloorTex, floorEffects, quaFlo );

      mFBONode   = new DistortedNode(mFBOTex  , FBOEffects  , quaFBO );

      ///////////////// The Meat of this App - shamelessly ripped off https://open.gl/depthstencils ///////////////////////

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

      // Stuff to do just before we render the upper Cube

      // Stuff to do just before we render the Floor

      mFloorNode.glStencilFunc(GLES31.GL_ALWAYS, 1, 0xFF);                       // Set any stencil to 1

      mFloorNode.glStencilOp(GLES31.GL_KEEP, GLES31.GL_KEEP, GLES31.GL_REPLACE); // replace with 1 when we fail Depth test

      mFloorNode.glDepthMask(false);                                             // Don't write to depth buffer

      // Stuff to do just before we render the lower Cube

                                                                                 // this again even though Floor just set it

      mCube2Node.glDepthMask(true);                                              // Write to depth buffer

      setScreen(true);

      Static3D axisX = new Static3D(1,0,0);

      Static3D axisZ = new Static3D(0,0,1);

      Dynamic1D rotDyn = new Dynamic1D(5000,0.0f);

      rotDyn.setMode(Dynamic1D.MODE_JUMP);

      rotDyn.add(new Static1D(  0));

      rotDyn.add(new Static1D(360));

      MatrixEffectRotate rotaZ = new MatrixEffectRotate(rotDyn, axisZ, rotCenter);

      cube1Effects.apply( move1 );

      cube1Effects.apply( rotaZ );

      cube1Effects.apply( rotaX );

      // Floor

      floorEffects.apply( rotaX );

      cube2Effects.apply( rotaZ );

      cube2Effects.apply( rotaX );

      // Framebuffer

      }

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

    public void onDrawFrame(GL10 glUnused) 

      {

      mScreen.render(System.currentTimeMillis());

      }

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

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

      {

      float ch = mCube1Node.getMesh().getStretchY();

      float bh = mFBONode.getMesh().getStretchY();

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

    public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {

      InputStream is = mView.getContext().getResources().openRawResource(R.raw.cat);

      Bitmap bitmap;

      try

        {

        bitmap = BitmapFactory.decodeStream(is);

        }

      finally

        {

        try

          {

          is.close();

          }

        catch(IOException e) { }

        }

      mCubeTex.setTexture(bitmap);

      mFloorTex.setColor(0xff000000);  // ARGB

      try

        {

      catch(Exception ex)

        {

        android.util.Log.e("Stencil", ex.getMessage() );

        }

      }

}