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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 java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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class DistortedBitmapGrid extends DistortedObjectGrid
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{
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///////////////////////////////////////////////////////////////////////////////////////////////////
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DistortedBitmapGrid(int xLength, int yLength)
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{
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float tmpx,tmpy,tmpz;
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float[] bufferData;
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dataLength = 2*xLength*(yLength-1)+2*(yLength-2); // (yLength-1) strips, 2*xLength triangles in each, plus 2 degenerate triangles per each of (yLength-2) joins
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////////////////////////////////////////////////////////////
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// vertex indices
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int offset=0;
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final short[] indexData = new short[dataLength];
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for(int y=0; y<yLength-1; y++)
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{
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if (y>0) indexData[offset++] = (short) (y*xLength); // Degenerate begin: repeat first vertex
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for (int x = 0; x < xLength; x++)
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{
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indexData[offset++] = (short) (( y *xLength)+x);
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indexData[offset++] = (short) (((y+1)*xLength)+x);
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}
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if (y<yLength-2) indexData[offset++] = (short) (((y+1)*xLength) + (xLength-1)); // Degenerate end: repeat last vertex
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}
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// for(int g=0; g<dataLength; g++) Log.e("grid", "index["+g+"]="+indexData[g]);
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////////////////////////////////////////////////////////////
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// texture
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offset=0;
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bufferData = new float[TEX_DATA_SIZE*dataLength];
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for(int i=0; i<dataLength; i++)
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{
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tmpx = ((float)(indexData[offset/2]%xLength))/(xLength-1);
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tmpy = ((float)(indexData[offset/2]/xLength))/(yLength-1);
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bufferData[offset++] = tmpx; // s=x
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bufferData[offset++] = tmpy; // t=y
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}
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mGridTexture = ByteBuffer.allocateDirect(TEX_DATA_SIZE*dataLength*BYTES_PER_FLOAT).order(ByteOrder.nativeOrder()).asFloatBuffer();
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mGridTexture.put(bufferData).position(0);
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//for(int g=0; g<dataLength; g++) Log.e("grid", "tex["+g+"]=("+bufferData[2*g]+","+bufferData[2*g+1]+")");
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//Log.e("grid", "regWidth="+(2*mRegW)+" regHeight="+(2*mRegH)+" xLength="+xLength+" yLength="+yLength);
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////////////////////////////////////////////////////////////
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// vertex positions
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offset=0;
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bufferData= new float[POSITION_DATA_SIZE*dataLength];
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for(int i=0; i<dataLength; i++)
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{
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tmpx = ((float)(indexData[offset/3]%xLength))/(xLength-1);
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tmpy = ((float)(indexData[offset/3]/xLength))/(yLength-1);
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tmpz = 0;
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bufferData[offset++] = (tmpx-0.5f); // x
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bufferData[offset++] = (0.5f-tmpy); // y
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bufferData[offset++] = tmpz; // z
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}
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mGridPositions = ByteBuffer.allocateDirect(POSITION_DATA_SIZE*dataLength*BYTES_PER_FLOAT).order(ByteOrder.nativeOrder()).asFloatBuffer();
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mGridPositions.put(bufferData).position(0);
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//for(int g=0; g<dataLength; g++) android.util.Log.e("grid", "pos["+g+"]=("+bufferData[3*g]+","+bufferData[3*g+1]+")");
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////////////////////////////////////////////////////////////
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// normals
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offset=0;
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bufferData = new float[NORMAL_DATA_SIZE*dataLength];
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for(int i=0; i<dataLength; i++)
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{
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bufferData[offset++] = 0.0f; // x
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bufferData[offset++] = 0.0f; // y
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bufferData[offset++] = 1.0f; // z
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}
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mGridNormals = ByteBuffer.allocateDirect(NORMAL_DATA_SIZE*dataLength*BYTES_PER_FLOAT).order(ByteOrder.nativeOrder()).asFloatBuffer();
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mGridNormals.put(bufferData).position(0);
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}
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}
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