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MeshObjectLoader.java
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MeshObjectLoader.java
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package se.happanero.app;
import android.util.Log;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.util.ArrayList;
/**
* Created by Kristoffer on 15-08-06.
*/
public class MeshObjectLoader {
private static String TAG = "ObjectLoader";
private static int BUFFER_READER_SIZE = 65536;
private static boolean ENABLE_LOGGING = false;
/**
* Load 3D model mesh from inputstream.
* A Wavefront formatted file (.obj) is expected as input and may be loaded
* remotely or as a local file.
* @param is input file in form of a .obj "text file".
* @return a object containing vertices, normals and textureCoordinates.
*/
public static MeshArrays loadModelMeshFromStream(InputStream is) {
BufferedReader bufferedReader = null;
try {
// Lists to keep all data when reading file
ArrayList<Float> vlist = new ArrayList<Float>();
ArrayList<Float> tlist = new ArrayList<Float>();
ArrayList<Float> nlist = new ArrayList<Float>();
ArrayList<Face> fplist = new ArrayList<Face>();
// Result buffers
FloatBuffer mVertexBuffer;
FloatBuffer mTexBuffer;
FloatBuffer mNormBuffer;
int numVerts = 0;
int numTexCoords = 0;
int numNormals = 0;
int numFaces = 0;
String str;
String[] tmp;
bufferedReader = new BufferedReader(new InputStreamReader(is), BUFFER_READER_SIZE);
while ((str = bufferedReader.readLine()) != null) {
// Replace double spaces. Some files may have it. Ex. files from 3ds max.
str = str.replace(" ", " ");
tmp = str.split(" ");
if (tmp[0].equalsIgnoreCase("v")) {
for (int i = 1; i < 4; i++) {
vlist.add(Float.parseFloat(tmp[i]));
}
numVerts++;
}
if (tmp[0].equalsIgnoreCase("vn")) {
for (int i = 1; i < 4; i++) {
nlist.add(Float.parseFloat(tmp[i]));
}
numNormals++;
}
if (tmp[0].equalsIgnoreCase("vt")) {
for (int i = 1; i < 3; i++) {
tlist.add(Float.parseFloat(tmp[i]));
}
numTexCoords++;
}
if (tmp[0].equalsIgnoreCase("f")) {
String[] ftmp;
int facex;
int facey;
int facez;
for (int i = 1; i < 4; i++) {
ftmp = tmp[i].split("/");
facex = faceStringToInt(ftmp, 0) - 1;
facey = faceStringToInt(ftmp, 1) - 1;
facez = faceStringToInt(ftmp, 2) - 1;
fplist.add(new Face(facex, facey, facez));
}
numFaces++;
if (tmp.length > 4 && !tmp[4].equals("")) {
for (int i = 1; i < 5; i++) {
ftmp = tmp[i].split("/");
if (i == 1 || i == 3) {
facex = faceStringToInt(ftmp, 0) - 1;
facey = faceStringToInt(ftmp, 1) - 1;
facez = faceStringToInt(ftmp, 2) - 1;
fplist.add(new Face(facex, facey, facez));
} else if (i == 2) {
String[] gtmp = tmp[4].split("/");
facex = faceStringToInt(gtmp, 0) - 1;
facey = faceStringToInt(gtmp, 1) - 1;
facez = faceStringToInt(gtmp, 2) - 1;
fplist.add(new Face(facex, facey, facez));
}
}
numFaces++;
}
}
}
if (ENABLE_LOGGING) {
Log.d(TAG, "Vertices: " + numVerts);
Log.d(TAG, "Normals: " + numNormals);
Log.d(TAG, "TextureCoords: " + numTexCoords);
Log.d(TAG, "Faces: " + numFaces);
}
// Each float takes 4 bytes
int fplistSize = fplist.size();
ByteBuffer vbb = ByteBuffer.allocateDirect(fplistSize * 4 * 3);
vbb.order(ByteOrder.LITTLE_ENDIAN);
mVertexBuffer = vbb.asFloatBuffer();
ByteBuffer vtbb = ByteBuffer.allocateDirect(fplistSize * 4 * 2);
vtbb.order(ByteOrder.LITTLE_ENDIAN);
mTexBuffer = vtbb.asFloatBuffer();
ByteBuffer nbb = ByteBuffer.allocateDirect(fplistSize * 4 * 3);
nbb.order(ByteOrder.LITTLE_ENDIAN);
mNormBuffer = nbb.asFloatBuffer();
int vlistSize = vlist.size();
int nlistSize = nlist.size();
int tlistSize = tlist.size();
Face face;
for (int j = 0; j < fplistSize; j++) {
face = fplist.get(j);
mVertexBuffer.put(vlist.get(fixedIndex(vlistSize, (int) face.fx * 3, numVerts)));
mVertexBuffer.put(vlist.get(fixedIndex(vlistSize, (int) (face.fx * 3 + 1), numVerts)));
mVertexBuffer.put(vlist.get(fixedIndex(vlistSize, (int) (face.fx * 3 + 2), numVerts)));
mTexBuffer.put(tlist.get(fixedIndex(tlistSize, face.fy * 2, numTexCoords)));
mTexBuffer.put(tlist.get(fixedIndex(tlistSize, face.fy * 2 + 1, numTexCoords)));
mNormBuffer.put(nlist.get(fixedIndex(nlistSize, face.fz * 3, numNormals)));
mNormBuffer.put(nlist.get(fixedIndex(nlistSize, face.fz * 3 + 1, numNormals)));
mNormBuffer.put(nlist.get(fixedIndex(nlistSize, face.fz * 3 + 2, numNormals)));
}
mVertexBuffer.rewind();
mTexBuffer.rewind();
mNormBuffer.rewind();
return new MeshArrays(mVertexBuffer, mNormBuffer, mTexBuffer, numFaces * 3);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
try {
if (bufferedReader != null) {
bufferedReader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
private static int fixedIndex(int listSize, int index, int total) {
if (index >= listSize || index < 0) {
return total -1;
} else {
return index;
}
}
private static int faceStringToInt(String[] number, int index) {
int result;
try {
result = Integer.parseInt(number[index]);
} catch (Exception e) {
// do nothing at the moment return 0
result = 0;
}
return result;
}
/**
* Local class to keep vertex, normal and texture coordinate while reading file.
*/
private static class Face {
public long fx;
public int fy;
public int fz;
public Face(long fx, int fy, int fz) {
this.fx = fx;
this.fy = fy;
this.fz = fz;
}
}
/**
* MeshArrays keeps all necessary arrays needed to be drawn with openGL.
*/
public static class MeshArrays {
private Buffer vertices;
private Buffer normals;
private Buffer texCoords;
private int numVertices;
public MeshArrays(Buffer vertices, Buffer normals, Buffer texCoords, int numVertices) {
this.vertices = vertices;
this.normals = normals;
this.texCoords = texCoords;
this.numVertices = numVertices;
}
public Buffer getVertices() {
return vertices;
}
public Buffer getNormals() {
return normals;
}
public Buffer getTexCoords() {
return texCoords;
}
public int getNumVertices() {
return numVertices;
}
}
}