se.angergard.engine.display.Display.java Source code

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Here is the source code for se.angergard.engine.display.Display.java

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/********************************************************************************
 *
 *   Copyright 2014 Theodor Angergard
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *   limitations under the License.
 *
 *******************************************************************************/

package se.angergard.engine.display;

import static org.lwjgl.glfw.Callbacks.*;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryUtil.*;

import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;

import se.angergard.engine.graphics.*;
import se.angergard.engine.util.*;

/** @author Theodor Angergrd
 *
 *         Handles the LWJGL display. */
public class Display {

    private Display() {

    }

    private static GLFWErrorCallback errorCallback;
    private static GLFWKeyCallback keyCallback;

    private static long window;
    private static int width, height;

    public static void create(DisplayDef def) {

        glfwSetErrorCallback(errorCallback = errorCallbackPrint(System.err));

        if (glfwInit() != GL_TRUE) {
            throw new IllegalStateException("Unable to initialize GLFW");
        }

        glfwDefaultWindowHints();
        glfwWindowHint(GLFW_VISIBLE, GL_FALSE);
        glfwWindowHint(GLFW_RESIZABLE, GL_TRUE);
        glfwWindowHint(GLFW_DECORATED, GL_TRUE);
        // TODO: Fix this, important to MAC OS
        // glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);

        window = glfwCreateWindow(def.width, def.height, def.title, NULL, NULL);

        if (window == NULL) {
            throw new RuntimeException("Failed to create the GLFW window");
        }

        GLFW.glfwSetWindowSizeCallback(window, new GLFWWindowSizeCallback() {
            @Override
            public void invoke(long window, int width, int height) {
                System.out.println("Hej " + width + ", " + height);
                Display.width = width;
                Display.height = height;
            }
        });

        GLFW.glfwSetWindowCloseCallback(window, new GLFWWindowCloseCallback() {

            @Override
            public void invoke(long window) {
                RenderingEngine.dispose();
                glfwSetWindowShouldClose(window, GL11.GL_TRUE);
            }

        });

        glfwSetWindowPos(window, def.xPosition, def.yPosition);

        glfwMakeContextCurrent(window);
        glfwSwapInterval(1);

        glfwShowWindow(window);

        GLContext.createFromCurrent();

        // Only enable depth test if using 3d.

        glEnable(GL_TEXTURE_2D);

        glEnable(GL_BLEND);
        glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
        GL14.glBlendEquation(GL14.GL_FUNC_ADD); // Not really neccessary

        RenderUtil.setClearColor(0.0f, 0.0f, 0.0f, 1.0f);

        Logger.log(Values.VERSION);
        Logger.log("Your OpenGL version is " + glGetString(GL_VERSION));
        Logger.log("Created Display with the following settings : " + def.toString());

    }

    /** Updates the display
     *
     * Also checks for any errors */
    public static void update() {
        // Checks for any errors
        int errorFlag = glGetError();
        if (errorFlag != GL_NO_ERROR) {
            System.err.println(errorFlag);
        }

        // Updates the display

        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    public static int getWidth() {
        return width;
    }

    public static int getHeight() {
        return height;
    }

    public static long getWindow() {
        return window;
    }

}