started rewriting rendering and window handling

src/main/java/org/example/Entity.java

@@ -12,36 +12,13 @@ import java.util.Scanner;
 
 public class Entity
 {
-    OBJModel model;
+    Mesh mesh;
 
     public ShaderProgram shader;
 
-    private final int vaoId;
-    private final int vboId;
-
     public Entity(String object_file_path, String fragment_shader_path, String vertex_shader_path)
     {
-        // Load Object
-        try (InputStream in = this.getClass().getResourceAsStream(object_file_path)) {
-            // Create an OBJParser and parse the resource
-            final IOBJParser parser = new OBJParser();
-            this.model = parser.parse(in);
-
-            // Use the model representation to get some basic info
-            System.out.println(MessageFormat.format(
-                    "OBJ model has {0} vertices, {1} normals, {2} texture coordinates, and {3} objects.",
-                    model.getVertices().size(),
-                    model.getNormals().size(),
-                    model.getTexCoords().size(),
-                    model.getObjects().size()));
-        } catch (Exception e) {
-            System.out.println("ERROR Parsing obj");
-            e.printStackTrace();
-            System.exit(1);
-        }
-
-        vaoId = 0;
-        vboId = 0;
+        this.mesh = new Mesh(object_file_path);
 
         // Load Shaders
         try {
@@ -68,12 +45,4 @@ public class Entity
             e.printStackTrace();
         }
     }
-
-    public int getVaoId() {
-        return vaoId;
-    }
-
-    public int getVboId() {
-        return vboId;
-    }
 }

src/main/java/org/example/Game.java

@@ -1,11 +1,13 @@
 package org.example;
 
+import org.joml.*;
 import org.lwjgl.*;
 import org.lwjgl.Version;
 import org.lwjgl.glfw.*;
 import org.lwjgl.opengl.*;
 import org.lwjgl.system.*;
 
+import java.lang.Math;
 import java.nio.*;
 import java.io.*;
 import java.text.MessageFormat;
@@ -13,6 +15,9 @@ import java.text.MessageFormat;
 import static org.lwjgl.glfw.Callbacks.*;
 import static org.lwjgl.glfw.GLFW.*;
 import static org.lwjgl.opengl.GL11.*;
+import static org.lwjgl.opengl.GL15.*;
+import static org.lwjgl.opengl.GL20.*;
+import static org.lwjgl.opengl.GL30.*;
 import static org.lwjgl.system.MemoryStack.*;
 import static org.lwjgl.system.MemoryUtil.*;
 
@@ -21,7 +26,11 @@ import org.lwjgl.system.MemoryStack;
 
 public class Game
 {
+    public static final float Z_FAR = 1000.0f;
+    public static final float Z_NEAR = 0.1f;
+    public static final float FOV = (float) Math.toRadians(90.0f);
     private long window;
+    private Matrix4f projection_matrix;
 
     public void run()
     {
@@ -102,6 +111,12 @@ public class Game
         // Add stuff to world
         world.addEntity(new Entity("/objs/cube.obj", "/shaders/shader.frag", "/shaders/shader.vert"));
 
+        // Calculate Perspective Matrix
+        int w, h;
+        glfwGetWindowSize(window, w, h);
+        float aspect_ratio = (float) ;
+        this.projection_matrix = new Matrix4f().perspective(FOV, )
+
         // Main loop or something
         while ( !glfwWindowShouldClose(window) )
         {
@@ -109,10 +124,22 @@ public class Game
 
             glfwSwapBuffers(window);
 
+            for (Entity entity : world.entities)
+                render(entity);
+
             glfwPollEvents();
         }
     }
 
+    public void render(Entity entity) {
+        entity.shader.bind();
+
+        glBindVertexArray(entity.mesh.vao_id);
+        glEnableVertexAttribArray(0);
+        glEnableVertexAttribArray(1);
+        glDrawElements(GL_TRIANGLES, entity.mesh.vertex_count, GL_UNSIGNED_INT, 0);
+    }
+
     public static void main(String[] args)
     {
         new Game().run();

src/main/java/org/example/Mesh.java

@@ -1,24 +1,44 @@
 package org.example;
 
+import org.apache.commons.lang3.ArrayUtils;
+import org.lwjgl.system.MemoryUtil;
+
 import java.io.File;
 import java.io.FileNotFoundException;
+import java.nio.FloatBuffer;
 import java.util.ArrayList;
 import java.util.Scanner;
 
-public class Mesh {
-    private final int vaoId;
-    private final int vboId;
+import static org.lwjgl.opengl.GL11.*;
+import static org.lwjgl.opengl.GL15.*;
+import static org.lwjgl.opengl.GL20.*;
+import static org.lwjgl.opengl.GL30.*;
 
-    public Mesh() {
-        this.vaoId = 0;
-        this.vboId = 0;
+public class Mesh {
+
+    public int vertex_count;
+    public int vao_id;
+    public int vbo_id;
+
+    Float[] vertices;
+    Float[] normals;
+    Integer[] vertice_indices;
+    Integer[] normal_indices;
+
+    // Creates a new Mesh object from an wavefront .obj file
+    public Mesh(String obj_file_path) {
+        this.loadObj(obj_file_path);
     }
 
     public void loadObj(String file_path) {
+
+        ArrayList<Float> temp_vertices = new ArrayList<>();
+        ArrayList<Float> temp_normals = new ArrayList<>();
+        ArrayList<Integer> temp_vertice_indices = new ArrayList<>();
+        ArrayList<Integer> temp_normal_indices = new ArrayList<>();
+
         Scanner scanner;
         File obj;
-        ArrayList<Float> vertices = new ArrayList<>();
-        ArrayList<Float> normals = new ArrayList<>();
 
         String line;
         String[] face_data_temp;
@@ -42,9 +62,73 @@ public class Mesh {
 
             switch (data[0]) {
                 case "v":
-                    vertices.add(Float.valueOf(data[1]));
+                    temp_vertices.add(Float.valueOf(data[1]));
+                    temp_vertices.add(Float.valueOf(data[2]));
+                    temp_vertices.add(Float.valueOf(data[3]));
+                    break;
+                case "vn":
+                    temp_normals.add(Float.valueOf(data[1]));
+                    temp_normals.add(Float.valueOf(data[2]));
+                    temp_normals.add(Float.valueOf(data[3]));
+                    break;
+                case "f":
+                    // Sample face data : "f 5//1 3//1 1//1" where each thing is v//normal_v
+
+                    for (i = 1; i < 4; i++) {
+                        face_data_temp = data[i].split("//");
+                        temp_vertice_indices.add(Integer.parseInt(face_data_temp[0]));
+
+                        if (face_data_temp.length > 1)
+                            temp_normal_indices.add(Integer.parseInt(face_data_temp[1]));
+                    }
+                    break;
             }
         }
 
+        this.vertices = temp_vertices.toArray(Float[]::new);
+        this.normals = temp_normals.toArray(Float[]::new);
+        this.vertice_indices = temp_vertice_indices.toArray(Integer[]::new);
+        this.normal_indices = temp_normal_indices.toArray(Integer[]::new);
+
+        // OBJ File has been read, setup openGL buffers
+        init();
+    }
+
+    private void init() {
+        FloatBuffer vertices_buffer = null;
+
+        try {
+            vertices_buffer = MemoryUtil.memAllocFloat(this.vertices.length);
+            vertex_count = this.vertices.length / 3;
+
+            // Convert from our object list to the primitive float array
+            vertices_buffer.put(ArrayUtils.toPrimitive(this.vertices)).flip();
+
+            this.vao_id = glGenVertexArrays();
+            glBindVertexArray(this.vao_id);
+
+            this.vbo_id = glGenBuffers();
+            glBindBuffer(GL_ARRAY_BUFFER, this.vbo_id);
+            glBufferData(GL_ARRAY_BUFFER, vertices_buffer, GL_STATIC_DRAW);
+            glVertexAttribPointer(0, 3, GL_FLOAT, false, 0, 0);
+
+            glBindBuffer(GL_ARRAY_BUFFER, 0);
+        } finally {
+            if (vertices_buffer != null) {
+                MemoryUtil.memFree(vertices_buffer);
+            }
+        }
+    }
+
+    public void cleanUp() {
+        glDisableVertexAttribArray(0);
+
+        // Delete the VBO
+        glBindBuffer(GL_ARRAY_BUFFER, 0);
+        glDeleteBuffers(this.vbo_id);
+
+        // Delete the VAO
+        glBindVertexArray(0);
+        glDeleteVertexArrays(this.vao_id);
     }
 }

src/main/java/org/example/Window.java

@@ -0,0 +1,24 @@
+package org.example;
+
+
+import org.lwjgl.glfw.*;
+import org.lwjgl.system.MemoryUtil;
+
+import java.util.concurrent.Callable;
+
+import static org.lwjgl.glfw.Callbacks.glfwFreeCallbacks;
+import static org.lwjgl.glfw.GLFW.*;
+import static org.lwjgl.opengl.GL11.*;
+import static org.lwjgl.system.MemoryUtil.NULL;
+
+public class Window {
+    public long window_handle;
+
+    public int height;
+    public int width;
+    private Callable<Void> resize_func;
+
+    public Window(String title, Callable<Void> resize_func) {
+        
+    }
+}