package com.daniel.tests;

import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import static org.lwjgl.opengl.GL11.*;

/**
 *
 * @author daniel_j
 *
 */

public class Main { // class

    public static void main(String[] args) { // main function
        CreateDisplay(); // run our function to create a display
        InitializeOpenGL();
        WindowLoop(); // run our window loop function
        CleanWindowPresence();
    } // main function



    private static void CreateDisplay() { // this function will create our display
        try { // used to catch any errors
            Display.setDisplayMode(new DisplayMode(800, 500)); // set our display resolution
            Display.setTitle("OpenGL Tests"); // set the window title
            Display.create(); // create our display
        } catch (LWJGLException e) { // catch any errors
            e.printStackTrace(); // print the errors
        } // catch
    } // create display function


    private static void WindowLoop() { // this function will run our windows loop
        while(!Display.isCloseRequested()) { // main loop for our window
            glClear(GL_COLOR_BUFFER_BIT); // clear our canvas/frame
            glLoadIdentity(); // clear the matrix
            glColor3f(1.00f, 0.00f, 0.00f); // set our color
            DrawRect(56, 56, 128, 256, 45, 1.00f, 0.00f, 0.00f); // draw a rectangle
            DrawRect(200, 200, 128, 256, 60, 0.00f, 1.00f, 0.00f); // draw a rectangle
            DrawRect(300, 300, 128, 256, 60, 0.00f, 0.00f, 1.00f); // draw a rectangle
            Display.update(); // update our display
        } // end main loop
    } // window loop


    private static void DrawRect(float x, float y, float Width, float Height, float Rotation, float Color_R, float Color_G, float Color_B) { // this function will draw a rectangle
        // now we draw a square
        glPushMatrix(); {// create a new matrix
            glColor3f(Color_R, Color_G, Color_B); // set our color
            glTranslatef(x, y, 0); // where we draw our shape
            glRotatef(Rotation, 0, 0, 1); // rotate our shape around the z axis - angle, x, y, z

            glBegin(GL_QUADS); {// drawing a square
                glVertex2f(0, 0); // point 1
                glVertex2f(0, Height); // point 2
                glVertex2f(Width, Height); // point 3
                glVertex2f(Width, 0); // point 4
            } // drawing a square
            glEnd(); // end
        }
        glPopMatrix(); // finish our matrix

    } // draw rect


    private static void InitializeOpenGL() { // this function will initialize OpenGL stuff
        glMatrixMode(GL_PROJECTION); // select our projection matrix
        glLoadIdentity(); // clear our matrix
        glOrtho(0, Display.getWidth(), 0, Display.getHeight(), -1, 1); // create our display port
        glMatrixMode(GL_MODELVIEW); // select our model view matrix
        glClearColor(0, 0, 0, 1); // set our display clear color - RGBA
        glDisable(GL_DEPTH_TEST); // disable depth test for 2d drawing
    } // Initialize OpenGL



    private static void CleanWindowPresence() { // this function will clean our project out of memory upon closing
        Display.destroy(); // clean up our display

    } // clean project presence
} // class