187 lines
7.0 KiB
Java
187 lines
7.0 KiB
Java
package io.github.hydos.ginger.engine.obj.normals;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.util.ArrayList;
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import java.util.List;
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import io.github.hydos.ginger.engine.mathEngine.vectors.Vector2f;
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import io.github.hydos.ginger.engine.mathEngine.vectors.Vector3f;
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import io.github.hydos.ginger.engine.renderEngine.models.RawModel;
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import io.github.hydos.ginger.engine.utils.Loader;
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public class NormalMappedObjLoader {
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public static RawModel loadOBJ(String objFileName) {
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BufferedReader isr = null;
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isr = new BufferedReader(new InputStreamReader(Class.class.getResourceAsStream("/models/" + objFileName)));
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BufferedReader reader = new BufferedReader(isr);
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String line;
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List<VertexNM> vertices = new ArrayList<VertexNM>();
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List<Vector2f> textures = new ArrayList<Vector2f>();
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List<Vector3f> normals = new ArrayList<Vector3f>();
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List<Integer> indices = new ArrayList<Integer>();
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try {
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while (true) {
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line = reader.readLine();
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if (line.startsWith("v ")) {
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String[] currentLine = line.split(" ");
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Vector3f vertex = new Vector3f((float) Float.valueOf(currentLine[1]),
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(float) Float.valueOf(currentLine[2]),
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(float) Float.valueOf(currentLine[3]));
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VertexNM newVertex = new VertexNM(vertices.size(), vertex);
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vertices.add(newVertex);
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} else if (line.startsWith("vt ")) {
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String[] currentLine = line.split(" ");
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Vector2f texture = new Vector2f((float) Float.valueOf(currentLine[1]),
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(float) Float.valueOf(currentLine[2]));
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textures.add(texture);
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} else if (line.startsWith("vn ")) {
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String[] currentLine = line.split(" ");
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Vector3f normal = new Vector3f((float) Float.valueOf(currentLine[1]),
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(float) Float.valueOf(currentLine[2]),
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(float) Float.valueOf(currentLine[3]));
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normals.add(normal);
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} else if (line.startsWith("f ")) {
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break;
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}
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}
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while (line != null && line.startsWith("f ")) {
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String[] currentLine = line.split(" ");
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String[] vertex1 = currentLine[1].split("/");
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String[] vertex2 = currentLine[2].split("/");
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String[] vertex3 = currentLine[3].split("/");
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VertexNM v0 = processVertex(vertex1, vertices, indices);
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VertexNM v1 = processVertex(vertex2, vertices, indices);
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VertexNM v2 = processVertex(vertex3, vertices, indices);
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calculateTangents(v0, v1, v2, textures);//NEW
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line = reader.readLine();
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}
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reader.close();
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} catch (IOException e) {
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System.err.println("Error reading the file");
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}
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removeUnusedVertices(vertices);
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float[] verticesArray = new float[vertices.size() * 3];
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float[] texturesArray = new float[vertices.size() * 2];
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float[] normalsArray = new float[vertices.size() * 3];
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float[] tangentsArray = new float[vertices.size() * 3];
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@SuppressWarnings("unused")
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//some weird eclipse only error here i think
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float furthest = convertDataToArrays(vertices, textures, normals, verticesArray,
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texturesArray, normalsArray, tangentsArray);
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int[] indicesArray = convertIndicesListToArray(indices);
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return Loader.loadToVAO(verticesArray, indicesArray, normalsArray, tangentsArray, texturesArray);
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}
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private static void calculateTangents(VertexNM v0, VertexNM v1, VertexNM v2,
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List<Vector2f> textures) {
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Vector3f delatPos1 = Vector3f.sub(v1.getPosition(), v0.getPosition(), null);
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Vector3f delatPos2 = Vector3f.sub(v2.getPosition(), v0.getPosition(), null);
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Vector2f uv0 = textures.get(v0.getTextureIndex());
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Vector2f uv1 = textures.get(v1.getTextureIndex());
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Vector2f uv2 = textures.get(v2.getTextureIndex());
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Vector2f deltaUv1 = Vector2f.sub(uv1, uv0, null);
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Vector2f deltaUv2 = Vector2f.sub(uv2, uv0, null);
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float r = 1.0f / (deltaUv1.x * deltaUv2.y - deltaUv1.y * deltaUv2.x);
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delatPos1.scale(deltaUv2.y);
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delatPos2.scale(deltaUv1.y);
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Vector3f tangent = Vector3f.sub(delatPos1, delatPos2, null);
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tangent.scale(r);
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v0.addTangent(tangent);
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v1.addTangent(tangent);
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v2.addTangent(tangent);
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}
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private static VertexNM processVertex(String[] vertex, List<VertexNM> vertices,
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List<Integer> indices) {
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int index = Integer.parseInt(vertex[0]) - 1;
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VertexNM currentVertex = vertices.get(index);
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int textureIndex = Integer.parseInt(vertex[1]) - 1;
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int normalIndex = Integer.parseInt(vertex[2]) - 1;
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if (!currentVertex.isSet()) {
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currentVertex.setTextureIndex(textureIndex);
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currentVertex.setNormalIndex(normalIndex);
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indices.add(index);
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return currentVertex;
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} else {
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return dealWithAlreadyProcessedVertex(currentVertex, textureIndex, normalIndex, indices,
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vertices);
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}
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}
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private static int[] convertIndicesListToArray(List<Integer> indices) {
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int[] indicesArray = new int[indices.size()];
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for (int i = 0; i < indicesArray.length; i++) {
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indicesArray[i] = indices.get(i);
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}
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return indicesArray;
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}
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private static float convertDataToArrays(List<VertexNM> vertices, List<Vector2f> textures,
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List<Vector3f> normals, float[] verticesArray, float[] texturesArray,
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float[] normalsArray, float[] tangentsArray) {
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float furthestPoint = 0;
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for (int i = 0; i < vertices.size(); i++) {
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VertexNM currentVertex = vertices.get(i);
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if (currentVertex.getLength() > furthestPoint) {
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furthestPoint = currentVertex.getLength();
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}
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Vector3f position = currentVertex.getPosition();
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Vector2f textureCoord = textures.get(currentVertex.getTextureIndex());
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Vector3f normalVector = normals.get(currentVertex.getNormalIndex());
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Vector3f tangent = currentVertex.getAverageTangent();
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verticesArray[i * 3] = position.x;
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verticesArray[i * 3 + 1] = position.y;
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verticesArray[i * 3 + 2] = position.z;
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texturesArray[i * 2] = textureCoord.x;
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texturesArray[i * 2 + 1] = 1 - textureCoord.y;
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normalsArray[i * 3] = normalVector.x;
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normalsArray[i * 3 + 1] = normalVector.y;
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normalsArray[i * 3 + 2] = normalVector.z;
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tangentsArray[i * 3] = tangent.x;
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tangentsArray[i * 3 + 1] = tangent.y;
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tangentsArray[i * 3 + 2] = tangent.z;
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}
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return furthestPoint;
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}
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private static VertexNM dealWithAlreadyProcessedVertex(VertexNM previousVertex, int newTextureIndex,
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int newNormalIndex, List<Integer> indices, List<VertexNM> vertices) {
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if (previousVertex.hasSameTextureAndNormal(newTextureIndex, newNormalIndex)) {
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indices.add(previousVertex.getIndex());
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return previousVertex;
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} else {
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VertexNM anotherVertex = previousVertex.getDuplicateVertex();
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if (anotherVertex != null) {
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return dealWithAlreadyProcessedVertex(anotherVertex, newTextureIndex,
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newNormalIndex, indices, vertices);
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} else {
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VertexNM duplicateVertex = previousVertex.duplicate(vertices.size());
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duplicateVertex.setTextureIndex(newTextureIndex);
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duplicateVertex.setNormalIndex(newNormalIndex);
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previousVertex.setDuplicateVertex(duplicateVertex);
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vertices.add(duplicateVertex);
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indices.add(duplicateVertex.getIndex());
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return duplicateVertex;
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}
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}
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}
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private static void removeUnusedVertices(List<VertexNM> vertices) {
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for (VertexNM vertex : vertices) {
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vertex.averageTangents();
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if (!vertex.isSet()) {
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vertex.setTextureIndex(0);
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vertex.setNormalIndex(0);
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}
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}
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}
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} |