net.betabears.the2dlibrary.graphics.DisplayHandler.java Source code

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Here is the source code for net.betabears.the2dlibrary.graphics.DisplayHandler.java

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package net.betabears.the2dlibrary.graphics;

import net.betabears.the2dlibrary.event.EventBus;
import net.betabears.the2dlibrary.event.ExitEvent;
import net.betabears.the2dlibrary.event.KeyEvent;
import net.betabears.the2dlibrary.settings.DisplaySettings;
import org.lwjgl.glfw.GLFWErrorCallback;
import org.lwjgl.glfw.GLFWFramebufferSizeCallback;
import org.lwjgl.glfw.GLFWKeyCallback;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GLContext;

import java.util.logging.Level;
import java.util.logging.Logger;

import static org.lwjgl.glfw.GLFW.*;

public class DisplayHandler {

    private final EventBus ev = EventBus.getInstance();
    private static final Logger LOGGER = Logger.getLogger(DisplayHandler.class.getName());
    private long window;
    private DisplaySettings ds;

    public void init(final DisplaySettings ds) {
        this.ds = ds;

        glfwSetErrorCallback(new GLFWErrorCallback() {
            @Override
            public void invoke(int error, long description) {
                LOGGER.log(Level.SEVERE, "GLFW error occurred. Error code: {0}. Description {1}",
                        new Object[] { error, description });
                ev.post(new ExitEvent());
            }
        });

        if (glfwInit() != GL11.GL_TRUE) {
            LOGGER.log(Level.SEVERE, "Unable to initialize ");
            ev.post(new ExitEvent());
        }

        window = glfwCreateWindow(ds.getWidth(), ds.getHeight(), "A game", 0L, 0L);

        if (window == 0) {
            LOGGER.log(Level.SEVERE, "Unable to create window.");
            ev.post(new ExitEvent());
        }

        glfwSetFramebufferSizeCallback(window, new GLFWFramebufferSizeCallback() {
            @Override
            public void invoke(long window, int width, int height) {
                ds.setWidth(width);
                ds.setHeight(height);
                GL11.glViewport(0, 0, width, height);
            }
        });

        glfwSetKeyCallback(window, new GLFWKeyCallback() {
            @Override
            public void invoke(long window, int key, int scancode, int action, int mods) {
                ev.post(new KeyEvent(window, key, scancode, action, mods));
            }
        });

        glfwMakeContextCurrent(window);
        GLContext.createFromCurrent();
    }

    public void swapBuffers() {
        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    public void destroy() {
        glfwDestroyWindow(window);
        glfwTerminate();
        LOGGER.log(Level.INFO, "GLFW terminated.");
    }
}