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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.GLES20;
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import android.opengl.Matrix;
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import java.util.Iterator;
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import java.util.LinkedList;
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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 either WRITE-only Framebuffers from objects already constructed outside
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* of the library (the first constructor; primary use case: the screen) or an offscreen READ-WRITE
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* FBOs (used by the DistortedNode, but also can be used by external users of the library)
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* <p>
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* Also, keep all objects created in a static LinkedList. The point: we need to be able to mark
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* Framebuffers for deletion, and delete all marked objects later at a convenient time (that's
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* because we can only delete from a thread that holds the OpenGL context so here we provide a
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* framework where one is able to mark for deletion at any place and actual deletion takes place
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* on the next render).
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*/
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public class DistortedFramebuffer
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{
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private static final int TEXTURE_FAILED_TO_CREATE = -1;
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private static final int TEXTURE_NOT_CREATED_YET = -2;
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private static final int TEXTURE_DONT_CREATE = -3;
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private static boolean mListMarked = false;
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private static LinkedList<DistortedFramebuffer> mList = new LinkedList<>();
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private float mX, mY;
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private float mFOV;
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private int[] texIds = new int[1];
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private int[] fboIds = new int[1];
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private boolean mMarked;
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int mWidth,mHeight,mDepth,mDistance;
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float[] mProjectionMatrix;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private void createProjection()
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{
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if( mWidth>0 && mHeight>0 )
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{
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if( mFOV>0.0f ) // perspective projection
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{
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float left =(-mX-mWidth/2 )/mHeight;
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float right =(-mX+mWidth/2 )/mHeight;
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float bottom =(-mY-mHeight/2)/mHeight;
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float top =(-mY+mHeight/2)/mHeight;
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float near= (float)( (top-bottom) / (2*Math.tan(mFOV*Math.PI/360)) );
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mDistance = (int)(mHeight*near/(top-bottom));
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float far = 2*mDistance-near;
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mDepth = (int)((far-near)/2);
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Matrix.frustumM(mProjectionMatrix, 0, left, right, bottom, top, near, far);
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}
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else // parallel projection
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{
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float left =-mX-mWidth/2;
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float right =-mX+mWidth/2;
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float bottom =-mY-mHeight/2;
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float top =-mY+mHeight/2;
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float near= (float)( (top-bottom) / (2*Math.tan(Math.PI/360)) );
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mDistance = (int)(mHeight*near/(top-bottom));
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float far = 2*mDistance-near;
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mDepth = (int)((far-near)/2);
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Matrix.orthoM(mProjectionMatrix, 0, left, right, bottom, top, near, far);
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// must be called form a thread holding OpenGL Context
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private boolean createFBO()
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{
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GLES20.glGenTextures(1, texIds, 0);
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texIds[0]);
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GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
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GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
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GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_REPEAT);
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GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_REPEAT);
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GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, mWidth, mHeight, 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, null);
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GLES20.glGenFramebuffers(1, fboIds, 0);
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GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fboIds[0]);
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GLES20.glFramebufferTexture2D(GLES20.GL_FRAMEBUFFER, GLES20.GL_COLOR_ATTACHMENT0, GLES20.GL_TEXTURE_2D, texIds[0], 0);
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int status = GLES20.glCheckFramebufferStatus(GLES20.GL_FRAMEBUFFER);
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if(status != GLES20.GL_FRAMEBUFFER_COMPLETE)
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{
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android.util.Log.e("DistortedFramebuffer", "failed to create framebuffer, error="+status);
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GLES20.glDeleteTextures(1, texIds, 0);
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GLES20.glDeleteFramebuffers(1, fboIds, 0);
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fboIds[0] = 0;
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texIds[0] = TEXTURE_FAILED_TO_CREATE;
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return false;
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}
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mList.add(this);
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android.util.Log.e("FBO", "created ("+mWidth+","+mHeight+") "+fboIds[0]);
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return true;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// must be called form a thread holding OpenGL Context
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private void deleteFBO()
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{
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android.util.Log.e("FBO", "deleting ("+mWidth+","+mHeight+") "+fboIds[0]);
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GLES20.glDeleteTextures(1, texIds, 0);
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GLES20.glDeleteFramebuffers(1, fboIds, 0);
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fboIds[0] = 0;
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texIds[0] = TEXTURE_NOT_CREATED_YET;
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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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private void delete()
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{
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if( texIds[0]>=0 ) deleteFBO();
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mProjectionMatrix = null;
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mMarked = false;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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void reset()
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{
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texIds[0] = TEXTURE_NOT_CREATED_YET;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static synchronized void release()
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{
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mListMarked = false;
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mList.clear();
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// must be called form a thread holding OpenGL Context
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static synchronized void deleteAllMarked()
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{
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if( mListMarked )
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{
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DistortedFramebuffer tmp;
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Iterator<DistortedFramebuffer> iterator = mList.iterator();
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while(iterator.hasNext())
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{
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tmp = iterator.next();
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if( tmp.mMarked )
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{
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tmp.delete();
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iterator.remove();
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}
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}
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mListMarked = false;
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}
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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 FBO.
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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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public DistortedFramebuffer(int width, int height)
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{
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mProjectionMatrix = new float[16];
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mHeight = height;
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mWidth = width;
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fboIds[0] = -1;
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texIds[0] = TEXTURE_NOT_CREATED_YET;
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mFOV = 60.0f;
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mX = 0.0f;
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mY = 0.0f;
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mMarked = false;
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createProjection();
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Create a new DistortedFramebuffer from an already created OpenGL Framebuffer.
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*
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* @param fbo the ID of a OpenGL Framebuffer object. Typically 0 (the screen)
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*/
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public DistortedFramebuffer(int fbo)
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{
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mProjectionMatrix = new float[16];
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fboIds[0] = fbo;
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texIds[0] = TEXTURE_DONT_CREATE;
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mFOV = 60.0f;
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mX = 0.0f;
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mY = 0.0f;
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mMarked = false;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Mark the underlying OpenGL object for deletion. Actual deletion will take place on the next render.
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*/
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public void markForDeletion()
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{
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android.util.Log.e("FBO", "marking for deletion ("+mWidth+","+mHeight+") "+fboIds[0]);
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mListMarked = true;
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mMarked = true;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Create new Projection matrix.
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*
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* @param fov Vertical 'field of view' of the Projection frustrum (in degrees).
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* @param x X-coordinate of the point at which our camera looks at. -mWidth/2 < x < mWidth/2
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* @param y Y-coordinate of the point at which our camera looks at. -mHeight/2 < y < mHeight/2
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*/
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public void setProjection(float fov, float x, float y)
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{
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mFOV = fov;
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mX = x;
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mY = y;
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createProjection();
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Resize the underlying Framebuffer.
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*
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* As the Framebuffer is not created until the first render, typical usage of this API is actually
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* to set the size of an not-yet-created Framebuffer of an object that has been created with the
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* second constructor.
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* <p>
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* Fully creating an object, rendering to it, then resizing mid-render is also possible.
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*
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* @param width The new width.
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* @param height The new height.
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*/
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public void resize(int width, int height)
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{
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if( mWidth!=width || mHeight!=height )
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{
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mWidth = width;
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mHeight= height;
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createProjection();
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if( texIds[0]>0 ) markForDeletion();
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Set this as the Framebuffer to write to.
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*/
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public void setAsOutput()
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{
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if( texIds[0]==TEXTURE_NOT_CREATED_YET ) createFBO();
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GLES20.glBindFramebuffer(GLES20.GL_FRAMEBUFFER, fboIds[0]);
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Set this as the Framebuffer to read from.
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*/
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public void setAsInput()
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{
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if( texIds[0]==TEXTURE_NOT_CREATED_YET ) createFBO();
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, texIds[0]);
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}
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}
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