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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Copyright 2016 Leszek Koltunski //
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// //
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// This file is part of Distorted. //
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// //
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// Distorted is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 2 of the License, or //
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// (at your option) any later version. //
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// //
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// Distorted is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY; without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with Distorted. If not, see <http://www.gnu.org/licenses/>. //
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///////////////////////////////////////////////////////////////////////////////////////////////////
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package org.distorted.library;
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import android.opengl.GLES30;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Class which represents a OpenGL Framebuffer object.
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* <p>
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* User is able to create offscreen FBOs and both a) render to them b) use their COLOR0 attachment as
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* an input texture. Attaching Depths and/or Stencils is also possible.
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*/
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public class DistortedFramebuffer extends DistortedOutputSurface implements DistortedInputSurface
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{
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Must be called from a thread holding OpenGL Context
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// Watch out - this has the side-effect of binding a Texture and a Framebuffer!
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void create()
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{
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if( mColorCreated==NOT_CREATED_YET )
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{
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GLES30.glGenTextures(1, mColorH, 0);
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GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, mColorH[0]);
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GLES30.glTexParameteri(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_S, GLES30.GL_REPEAT);
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GLES30.glTexParameteri(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_T, GLES30.GL_REPEAT);
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GLES30.glTexParameterf(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_MIN_FILTER, GLES30.GL_NEAREST);
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GLES30.glTexParameterf(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_MAG_FILTER, GLES30.GL_LINEAR);
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GLES30.glTexImage2D(GLES30.GL_TEXTURE_2D, 0, GLES30.GL_RGBA, mSizeX, mSizeY, 0, GLES30.GL_RGBA, GLES30.GL_UNSIGNED_BYTE, null);
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GLES30.glGenFramebuffers(1, mFBOH, 0);
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GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, mFBOH[0]);
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GLES30.glFramebufferTexture2D(GLES30.GL_FRAMEBUFFER, GLES30.GL_COLOR_ATTACHMENT0, GLES30.GL_TEXTURE_2D, mColorH[0], 0);
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mColorCreated = checkStatus("color");
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}
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if( mDepthCreated==NOT_CREATED_YET ) // we need to create a new DEPTH attachment
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{
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GLES30.glGenTextures(1, mDepthH, 0);
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GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, mDepthH[0]);
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GLES30.glTexParameteri(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_S, GLES30.GL_REPEAT);
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GLES30.glTexParameteri(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_WRAP_T, GLES30.GL_REPEAT);
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GLES30.glTexParameteri(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_MIN_FILTER, GLES30.GL_NEAREST);
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GLES30.glTexParameteri(GLES30.GL_TEXTURE_2D, GLES30.GL_TEXTURE_MAG_FILTER, GLES30.GL_NEAREST);
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GLES30.glTexImage2D(GLES30.GL_TEXTURE_2D, 0, GLES30.GL_DEPTH_COMPONENT, mSizeX, mSizeY, 0, GLES30.GL_DEPTH_COMPONENT, GLES30.GL_UNSIGNED_SHORT, null);
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GLES30.glBindFramebuffer(GLES30.GL_FRAMEBUFFER, mFBOH[0]);
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GLES30.glFramebufferTexture2D(GLES30.GL_FRAMEBUFFER, GLES30.GL_DEPTH_ATTACHMENT, GLES30.GL_TEXTURE_2D, mDepthH[0], 0);
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mDepthCreated = checkStatus("depth");
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}
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if( mDepthCreated==DONT_CREATE && mDepthH[0]>0 ) // we need to detach and recreate the DEPTH attachment.
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{
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GLES30.glDeleteTextures(1, mDepthH, 0);
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mDepthH[0]=0;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private int checkStatus(String message)
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{
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int status = GLES30.glCheckFramebufferStatus(GLES30.GL_FRAMEBUFFER);
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if(status != GLES30.GL_FRAMEBUFFER_COMPLETE)
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{
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android.util.Log.e("DistortedFramebuffer", "FRAMEBUFFER INCOMPLETE, "+message+" error="+status);
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GLES30.glDeleteTextures(1, mColorH, 0);
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GLES30.glDeleteTextures(1, mDepthH, 0);
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GLES30.glDeleteFramebuffers(1, mFBOH, 0);
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mFBOH[0]= 0;
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return FAILED_TO_CREATE;
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}
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return CREATED;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Must be called from a thread holding OpenGL Context
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void delete()
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{
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if( mColorH[0]>0 )
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{
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if( mDepthH[0]>0 )
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{
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GLES30.glDeleteTextures(1, mDepthH, 0);
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mDepthH[0]=0;
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mDepthCreated = NOT_CREATED_YET;
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}
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GLES30.glDeleteTextures(1, mColorH, 0);
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mColorH[0] = 0;
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mColorCreated = NOT_CREATED_YET;
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GLES30.glDeleteFramebuffers(1, mFBOH, 0);
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mFBOH[0] = 0;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// called from onDestroy(); mark OpenGL assets as 'not created'
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void recreate()
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{
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if( mColorCreated!=DONT_CREATE )
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{
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mColorCreated = NOT_CREATED_YET;
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mColorH[0] = 0;
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}
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if( mDepthCreated!=DONT_CREATE )
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{
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mDepthCreated = NOT_CREATED_YET;
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mDepthH[0] = 0;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// create SYSTEM or TREE framebuffers (those are just like normal FBOs, just hold information
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// that they were autocreated only for the Library's internal purposes (SYSTEM) or for using
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// inside a Tree of DistortedNodes (TREE)
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// SYSTEM surfaces do not get removed in onDestroy().
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DistortedFramebuffer(boolean depthEnabled, int type, int width, int height)
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{
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super(width,height,NOT_CREATED_YET, (depthEnabled ? NOT_CREATED_YET:DONT_CREATE),NOT_CREATED_YET, type);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// For setting the Depth texture as input to fragment shaders that merge many planes. (currently: blur2)
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boolean setAsDepth()
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{
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if( mDepthH[0]>0 )
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{
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GLES30.glActiveTexture(GLES30.GL_TEXTURE1);
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GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, mDepthH[0]);
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return true;
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}
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return false;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// PUBLIC API
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Create a new offscreen Framebuffer.
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*
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* @param width Width of the COLOR attachment.
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* @param height Height of the COLOR attachment.
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* @param depthEnabled Add DEPTH attachment?
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*/
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@SuppressWarnings("unused")
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public DistortedFramebuffer(int width, int height, boolean depthEnabled)
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{
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super(width,height,NOT_CREATED_YET,(depthEnabled ? NOT_CREATED_YET:DONT_CREATE),NOT_CREATED_YET,TYPE_USER);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Create a new offscreen Framebuffer.
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*
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* @param width Width of the COLOR attachment.
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* @param height Height of the COLOR attachment.
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*/
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@SuppressWarnings("unused")
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public DistortedFramebuffer(int width, int height)
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{
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super(width,height,NOT_CREATED_YET,DONT_CREATE,NOT_CREATED_YET,TYPE_USER);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Bind the underlying rectangle of pixels as a OpenGL Texture.
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*
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* @return <code>true</code> if successful.
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*/
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public boolean setAsInput()
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{
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if( mColorH[0]>0 )
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{
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GLES30.glActiveTexture(GLES30.GL_TEXTURE0);
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GLES30.glBindTexture(GLES30.GL_TEXTURE_2D, mColorH[0]);
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return true;
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}
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return false;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Return the ID of the Texture (COLOR attachment 0) that's backing this FBO.
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* <p>
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* Catch: this will only work if the library has had time to actually create the texture. Remember
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* that the texture gets created only on first render, thus creating a Texture object and immediately
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* calling this method will return an invalid (negative) result.
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*
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* @return If there was not a single render between creation of the Object and calling this method on
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* it, return a negative value. Otherwise, return ID of COLOR attachment 0.
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*/
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public int getTextureID()
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{
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return mColorH[0];
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}
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}
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