init

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

@@ -0,0 +1,133 @@
+package org.example;
+
+import org.lwjgl.*;
+import org.lwjgl.Version;
+import org.lwjgl.glfw.*;
+import org.lwjgl.opengl.*;
+import org.lwjgl.system.*;
+
+import java.nio.*;
+import java.io.*;
+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.system.MemoryStack.*;
+import static org.lwjgl.system.MemoryUtil.*;
+
+import com.mokiat.data.front.parser.*;
+import org.lwjgl.system.MemoryStack;
+
+public class Game
+{
+    private long window;
+
+    public void run()
+    {
+        System.out.println("Running LWJGL Version " + Version.getVersion() + ".");
+
+        init();
+        loop();
+
+        // Free the window callbacks and destroy the window
+        glfwFreeCallbacks(window);
+        glfwDestroyWindow(window);
+
+        // Terminate GLFW and free the error callback
+        glfwTerminate();
+        glfwSetErrorCallback(null).free();
+    }
+
+    public void init()
+    {
+        GLFWErrorCallback.createPrint(System.err).set();
+
+        if (!glfwInit())
+            throw new IllegalStateException("Unable to Initialize GLFW");
+
+        // Configure GLFW
+        glfwDefaultWindowHints(); // optional, the current window hints are already the default
+        glfwWindowHint(GLFW_VISIBLE, GLFW_FALSE); // the window will stay hidden after creation
+        glfwWindowHint(GLFW_RESIZABLE, GLFW_TRUE); // the window will be resizable
+
+        // Create the window
+        window = glfwCreateWindow(300, 300, "Hello World!", NULL, NULL);
+        if ( window == NULL )
+            throw new RuntimeException("Failed to create the GLFW window");
+
+        // Setup a key callback. It will be called every time a key is pressed, repeated or released.
+        glfwSetKeyCallback(window, (window, key, scancode, action, mods) -> {
+            if ( key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE )
+                glfwSetWindowShouldClose(window, true); // We will detect this in the rendering loop
+        });
+
+        // Get the thread stack and push a new frame
+        try ( MemoryStack stack = stackPush() ) {
+            IntBuffer pWidth = stack.mallocInt(1); // int*
+            IntBuffer pHeight = stack.mallocInt(1); // int*
+
+            // Get the window size passed to glfwCreateWindow
+            glfwGetWindowSize(window, pWidth, pHeight);
+
+            // Get the resolution of the primary monitor
+            GLFWVidMode vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
+
+            // Center the window
+            glfwSetWindowPos(
+                    window,
+                    (vidmode.width() - pWidth.get(0)) / 2,
+                    (vidmode.height() - pHeight.get(0)) / 2
+            );
+        } // the stack frame is popped automatically
+
+        // Make the OpenGL context current
+        glfwMakeContextCurrent(window);
+        // Enable v-sync
+        glfwSwapInterval(1);
+
+        // Make the window visible
+        glfwShowWindow(window);
+
+        // Load Objects
+        try (InputStream in = this.getClass().getResourceAsStream("/objs/cube.obj")) {
+            // Create an OBJParser and parse the resource
+            final IOBJParser parser = new OBJParser();
+            final OBJModel 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) {
+            e.printStackTrace();
+            System.exit(1);
+        }
+    }
+
+    private void loop()
+    {
+        GL.createCapabilities();
+
+        glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
+
+        while ( !glfwWindowShouldClose(window) )
+        {
+            glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+            glfwSwapBuffers(window);
+
+            glfwPollEvents();
+        }
+    }
+
+    public static void main(String[] args)
+    {
+        new Game().run();
+    }
+
+
+}

src/main/java/org/example/ShaderProgram.java

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+package org.example;
+
+import static org.lwjgl.opengl.GL20.*;
+
+public class ShaderProgram {
+
+    private final int programId;
+
+    private int vertexShaderId;
+
+    private int fragmentShaderId;
+
+    public ShaderProgram() throws Exception {
+        programId = glCreateProgram();
+        if (programId == 0) {
+            throw new Exception("Could not create Shader");
+        }
+    }
+
+    public void createVertexShader(String shaderCode) throws Exception {
+        vertexShaderId = createShader(shaderCode, GL_VERTEX_SHADER);
+    }
+
+    public void createFragmentShader(String shaderCode) throws Exception {
+        fragmentShaderId = createShader(shaderCode, GL_FRAGMENT_SHADER);
+    }
+
+    protected int createShader(String shaderCode, int shaderType) throws Exception {
+        int shaderId = glCreateShader(shaderType);
+        if (shaderId == 0) {
+            throw new Exception("Error creating shader. Type: " + shaderType);
+        }
+
+        glShaderSource(shaderId, shaderCode);
+        glCompileShader(shaderId);
+
+        if (glGetShaderi(shaderId, GL_COMPILE_STATUS) == 0) {
+            throw new Exception("Error compiling Shader code: " + glGetShaderInfoLog(shaderId, 1024));
+        }
+
+        glAttachShader(programId, shaderId);
+
+        return shaderId;
+    }
+
+    public void link() throws Exception {
+        glLinkProgram(programId);
+        if (glGetProgrami(programId, GL_LINK_STATUS) == 0) {
+            throw new Exception("Error linking Shader code: " + glGetProgramInfoLog(programId, 1024));
+        }
+
+        if (vertexShaderId != 0) {
+            glDetachShader(programId, vertexShaderId);
+        }
+        if (fragmentShaderId != 0) {
+            glDetachShader(programId, fragmentShaderId);
+        }
+
+        glValidateProgram(programId);
+        if (glGetProgrami(programId, GL_VALIDATE_STATUS) == 0) {
+            System.err.println("Warning validating Shader code: " + glGetProgramInfoLog(programId, 1024));
+        }
+
+    }
+
+    public void bind() {
+        glUseProgram(programId);
+    }
+
+    public void unbind() {
+        glUseProgram(0);
+    }
+
+    public void cleanup() {
+        unbind();
+        if (programId != 0) {
+            glDeleteProgram(programId);
+        }
+    }
+}