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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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import java.nio.FloatBuffer;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Abstract class which represents a Mesh, ie 3 arrays of Vertex attributes: 1) positions
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* 2) normals 3) texture coordinates.
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* <p>
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* If you want to render to a particular shape, extend from here, construct the three FloatBuffers and
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* provide correct dataLength, i.e. the number of vertices.
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*/
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public abstract class MeshObject extends DistortedObject
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{
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static final int BYTES_PER_FLOAT = 4; //
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static final int POSITION_DATA_SIZE= 3; // Size of the position data in elements
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static final int NORMAL_DATA_SIZE = 3; // Size of the normal data in elements.
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static final int TEX_DATA_SIZE = 2; // Size of the texture coordinate data in elements.
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int dataLength;
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FloatBuffer mMeshPositions, mMeshNormals, mMeshTexture;
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int[] mPosVBO = new int[1];
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int[] mNorVBO = new int[1];
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int[] mTexVBO = new int[1];
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int[] mPosTBO = new int[1]; // Transform Feedback
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final float zFactor; // strange workaround for the fact that we need to somehow store the 'depth'
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// of the Mesh. Used in DistortedEffects. See DistortedTexture.getDepth().
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///////////////////////////////////////////////////////////////////////////////////////////////////
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MeshObject(float factor)
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{
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super(DistortedObject.NOT_CREATED_YET,DistortedObject.TYPE_USER);
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zFactor = factor;
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recreate();
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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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//
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// Do NOT release mMeshPositions etc as we will need them when we need to re-create the buffers after
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// a loss of OpenGL context!
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void create()
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{
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if( mPosVBO[0]<0 )
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{
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GLES30.glGenBuffers(1, mPosVBO, 0);
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mPosVBO[0]);
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GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, dataLength*POSITION_DATA_SIZE*BYTES_PER_FLOAT, mMeshPositions, GLES30.GL_STATIC_READ);
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}
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if( mNorVBO[0]<0 )
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{
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GLES30.glGenBuffers(1, mNorVBO, 0);
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mNorVBO[0]);
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GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, dataLength* NORMAL_DATA_SIZE*BYTES_PER_FLOAT, mMeshNormals , GLES30.GL_STATIC_READ);
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}
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if( mTexVBO[0]<0 )
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{
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GLES30.glGenBuffers(1, mTexVBO, 0);
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, mTexVBO[0]);
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GLES30.glBufferData(GLES30.GL_ARRAY_BUFFER, dataLength* TEX_DATA_SIZE*BYTES_PER_FLOAT, mMeshTexture , GLES30.GL_STATIC_READ);
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}
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if( mPosTBO[0]<0 ) // Buffer for Transform Feedback. Since we are rendering with GL_TRIANGLE_STRIP, after passing N vertices
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// we will get (N-2) triangles back, each 3 vertices of 12 bytes.
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{
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GLES30.glBindBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, mPosTBO[0]);
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GLES30.glBufferData(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 3*(dataLength-2)*POSITION_DATA_SIZE*BYTES_PER_FLOAT, null, GLES30.GL_STATIC_READ);
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GLES30.glBindBuffer(GLES30.GL_TRANSFORM_FEEDBACK_BUFFER, 0);
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}
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GLES30.glBindBuffer(GLES30.GL_ARRAY_BUFFER, 0);
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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( mPosVBO[0]>=0 )
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{
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GLES30.glDeleteBuffers(1, mPosVBO, 0);
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mPosVBO[0] = -1;
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}
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if( mNorVBO[0]>=0 )
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{
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GLES30.glDeleteBuffers(1, mNorVBO, 0);
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mNorVBO[0] = -1;
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}
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if( mTexVBO[0]>=0 )
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{
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GLES30.glDeleteBuffers(1, mTexVBO, 0);
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mTexVBO[0] = -1;
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}
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if( mPosTBO[0]>=0 )
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{
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GLES30.glDeleteBuffers(1, mPosTBO, 0);
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mPosTBO[0] = -1;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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void recreate()
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{
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mPosVBO[0] = -1;
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mNorVBO[0] = -1;
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mTexVBO[0] = -1;
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mPosTBO[0] = -1;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// debugging only
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String printDetails()
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{
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return getClass().getSimpleName()+" vertices:"+dataLength;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Get the minimal set of Vertices which have the same convex hull as the whole set.
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* <p>
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* In case of Flat Meshes, the set is obviously just the 4 corners. In case of the Cubes Mesh,
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* it is a subset of the set of each rightmost- and leftmost- corners in each row.
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* <p>
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* This is used to be able to quickly compute, in window coordinates, the Mesh'es bounding rectangle.
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*/
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abstract float[] getBoundingVertices();
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}
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