Distorted Android

// Copyright 2016 Leszek Koltunski  leszek@koltunski.pl                                          //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// This library is free software; you can redistribute it and/or                                 //

//                                                                                               //

// This library 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                             //

//                                                                                               //

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

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

package org.distorted.library.main;

import android.opengl.GLES30;

/**

 * <p>

 * User is able to create offscreen FBOs and both a) render to them b) use their COLOR0 attachment as

 * an input texture. Attaching Depths and/or Stencils is also possible.

 */

public class DistortedFramebuffer extends InternalOutputSurface

  {

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

// Must be called from a thread holding OpenGL Context

  void create()

    {

    if( mNumFBOs==DistortedLibrary.WAIT_FOR_FBO_QUEUE_SIZE )

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

    if( mColorCreated==NOT_CREATED_YET )

      {

      GLES30.glGenTextures( mNumFBOs*mNumColors, mColorH, 0);

      for(int i=0; i<mNumFBOs; i++)

        {

        GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, mFBOH[i]);

          GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, mColorH[i*mNumColors+j]);

          }

        GLES30.glFramebufferTexture2D(GLES30.GL_FRAMEBUFFER, GLES30.GL_COLOR_ATTACHMENT0, GLES30.GL_TEXTURE_2D, mColorH[i*mNumColors], 0);

        }

      // TODO

      mColorCreated = checkStatus("color");

      GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, 0);

      }

    if( mDepthStencilCreated==NOT_CREATED_YET ) // we need to create a new DEPTH or STENCIL attachment

      {

      GLES30.glGenTextures(mNumFBOs, mDepthStencilH, 0);

        {

        GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, mDepthStencilH[i]);

        if (mDepthStencil == DEPTH_NO_STENCIL)

          GLES30.glTexImage2D(GLES30.GL_TEXTURE_2D, 0, GLES30.GL_DEPTH_COMPONENT, mRealWidth, mRealHeight, 0, GLES30.GL_DEPTH_COMPONENT, GLES30.GL_UNSIGNED_INT, null);

          }

          GLES30.glTexImage2D(GLES30.GL_TEXTURE_2D, 0, GLES30.GL_DEPTH24_STENCIL8, mRealWidth, mRealHeight, 0, GLES30.GL_DEPTH_STENCIL, GLES30.GL_UNSIGNED_INT_24_8, null);

          }

      GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, 0);

      for(int i=0; i<mNumFBOs; i++)

        {

        GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, mFBOH[i]);

        if (mDepthStencil == DEPTH_NO_STENCIL)

          GLES30.glFramebufferTexture2D(GLES30.GL_FRAMEBUFFER, GLES30.GL_DEPTH_ATTACHMENT, GLES30.GL_TEXTURE_2D, mDepthStencilH[i], 0);

          }

          GLES30.glFramebufferTexture2D(GLES30.GL_FRAMEBUFFER, GLES30.GL_DEPTH_STENCIL_ATTACHMENT, GLES30.GL_TEXTURE_2D, mDepthStencilH[i], 0);

          }

      // TODO

      mDepthStencilCreated = checkStatus("depth");

      GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, 0);

      }

    if( mDepthStencilCreated==DONT_CREATE && mDepthStencilH[0]>0 ) // we need to detach and recreate the DEPTH attachment.

      {

      // OpenGL ES 3.0.5 spec, chapter 4.4.2.4 :

      for(int i=0; i<mNumFBOs; i++)

        GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, mFBOH[i]);

        mDepthStencilH[i]=0;

      GLES30.glDeleteTextures(mNumFBOs, mDepthStencilH, 0);

      }

    }

// TODO

  private int checkStatus(String message)

    {

    int status = GLES30.glCheckFramebufferStatus(GLES30.GL_FRAMEBUFFER);

    if(status != GLES30.GL_FRAMEBUFFER_COMPLETE)

      {

      DistortedLibrary.logMessage("DistortedFramebuffer: FRAMEBUFFER INCOMPLETE, "+message+" error="+status);

      GLES30.glDeleteTextures(1, mColorH, 0);

      mFBOH[0]= 0;

      return FAILED_TO_CREATE;

      }

    return CREATED;

    }

// Must be called from a thread holding OpenGL Context

  void delete()

    {

    if( mColorH[0]>0 )

      {

      GLES30.glDeleteTextures(mNumFBOs*mNumColors, mColorH, 0);

      mColorCreated = NOT_CREATED_YET;

      }

    if( mDepthStencilH[0]>0 )

      GLES30.glDeleteTextures(mNumFBOs, mDepthStencilH, 0);

      mDepthStencilCreated = NOT_CREATED_YET;

      }

    if( mNumFBOs>0 && mFBOH[0]>0 )

    }

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

  void recreate()

    {

    if( mColorCreated!=DONT_CREATE )

    if( mDepthStencilCreated!=DONT_CREATE )

      {

      mDepthStencilCreated = NOT_CREATED_YET;

      }

    for(int i=0; i<mNumFBOs; i++)

    }

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

      GLES30.glActiveTexture(GLES30.GL_TEXTURE0);

      return true;

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

// create a multi-framebuffer (1 object containing multiple FBOs)

  DistortedFramebuffer(int numfbos, int numcolors, int depthStencil, int type, int storage, int width, int height)

    {

    super(width,height,NOT_CREATED_YET,numfbos,numcolors,depthStencil,NOT_CREATED_YET, type, storage);

    markForCreation();

    }

// create SYSTEM or TREE framebuffers (those are just like normal FBOs, just hold information

  DistortedFramebuffer(int numcolors, int depthStencil, int type, int width, int height)

    {

    this(1,numcolors,depthStencil,type,STORAGE_PRIVATE,width,height);

    }

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

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

/**

 * Create new offscreen Framebuffer with configurable number of COLOR, DEPTH and STENCIL attachments.

 *

 * @param width        Width of all the COLOR attachments.

 * @param depthStencil Add DEPTH or STENCIL attachment?

 *                     Valid values: NO_DEPTH_NO_STENCIL, DEPTH_NO_STENCIL, BOTH_DEPTH_STENCIL.

 */

  public DistortedFramebuffer(int width, int height, int numcolors, int depthStencil)

    {

    this(1,numcolors,depthStencil,TYPE_USER,STORAGE_PRIVATE,width,height);

    }

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

 * @param texture The Texture number to bind (and thus read from).

 * @return <code>true</code> if successful.

    if( texture>=0 && texture<mNumColors && mColorH[texture]>0 )

      {

      GLES30.glActiveTexture(GLES30.GL_TEXTURE0);

      return true;

  /**

  public void bindForOutput(int texture)

    if( texture>=0 && texture<mNumColors && mColorH[texture]>0 )

      {

      GLES30.glFramebufferTexture2D(GLES30.GL_FRAMEBUFFER, GLES30.GL_COLOR_ATTACHMENT0, GLES30.GL_TEXTURE_2D, mColorH[2*mCurrFBO+texture], 0);

      }

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

 * @param depthStencil Valid values: NO_DEPTH_NO_STENCIL, DEPTH_NO_STENCIL, BOTH_DEPTH_STENCIL.

 */

    if( depthStencil != mDepthStencil )

      {

      if( depthStencil!= NO_DEPTH_NO_STENCIL && mDepthStencilCreated==DONT_CREATE )

        {

        mDepthStencilCreated = NOT_CREATED_YET;

        }

      if( depthStencil== NO_DEPTH_NO_STENCIL && mDepthStencilCreated!=DONT_CREATE )

      }

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

 * Return the ID of the Texture (COLOR attachment 0) that's backing this FBO.

 * @return If there was not a single render between creation of the Object and calling this method on

 */

  public int getTextureID()

    {

    return mColorH[0];

    }

  }