好的，我在过去的4天里一直试图解决这个问题，而且我已经在谷歌搜索了几个小时的答案。
我知道由于某种原因，我的纹理不会被加载，纹理等于null， 好像它从未被宣布过。
错误
Exception in thread "main" java.lang.NullPointerException
at RetinaEngine.RetinaDraw.drawTexture(RetinaDraw.java:65)
at GameTest.Game.renderGame(Game.java:61)
at RetinaEngine.Main.renderGame(Main.java:97)
at RetinaEngine.Main.startGameLoop(Main.java:60)
at RetinaEngine.Main.main(Main.java:46)
Java Result: 1
所以我希望你们其中一个人看到问题。
我的主要课程
package RetinaEngine;
import GameTest.Game;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import static org.lwjgl.opengl.GL11.*;
/**
* @author ***** ********
*/
public class Main {
/*
* Declare variables
*/
private static int gameWindowWidth = 1280;
private static int gameWindowHeight = 720;
private static String gameWindowName = "IndieSpaceGame";
private static boolean fullScreen = false;
private static boolean startFullScreen = false;
private static DisplayMode displayModeFullScreen;
private static DisplayMode displayModeWindowed;
private static Game game;
/*
* The Main Methode
*/
public static void main(String[] args)
{
initializeDisplayModes();
initializeDisplay();
initializeOpenGL();
initializeGame();
startGameLoop();
destroyDisplay();
}
/*
* This starts the loop that runs this game
*/
private static void startGameLoop()
{
while(!Display.isCloseRequested())
{
getUserInput();
updateGame();
renderGame();
}
}
/*
* The Method that looks if the user had anny input
*/
private static void getUserInput()
{
if(Keyboard.isKeyDown(Keyboard.KEY_LCONTROL) & Keyboard.isKeyDown(Keyboard.KEY_LSHIFT) & !Keyboard.isRepeatEvent())
{
switchFullScreen();
}
game.getUserInput();
}
/*
* The Method that updates all the objects in the game
*/
private static void updateGame()
{
game.updateGame();
}
/*
* The method that starts rendereing the game
*/
private static void renderGame()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glColor3f(1,1,1);
game.renderGame();
Display.update();
Display.sync(60);
}
/*
* The Methode That sets up the Display
*/
private static void initializeDisplay()
{
try
{ if(startFullScreen)
{
Display.setDisplayMode(displayModeFullScreen);
}
else
{
Display.setDisplayMode(displayModeWindowed);
}
Display.setTitle(gameWindowName);
Display.setFullscreen(true);
Display.setResizable(false);
Display.create();
Display.setVSyncEnabled(true);
}
catch (LWJGLException ex)
{
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
/*
* The methode that initialize all the openGL code
*/
private static void initializeOpenGL()
{
//glViewport(0, gameWindowWidth, 0, gameWindowHeight);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-(gameWindowWidth / 2), (gameWindowWidth / 2), -(gameWindowHeight / 2), (gameWindowHeight / 2),-1,1);
glMatrixMode(GL_TEXTURE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glMatrixMode(GL_MODELVIEW);
glClearColor(0,0,0,0);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glDisable(GL_DEPTH_TEST);
glEnable(GL_TEXTURE_2D);
}
/*
* The methode that initializes the Game
*/
private static void initializeGame()
{
game = new Game();
}
/*
* initialize all the diffrent display modes
*/
private static void initializeDisplayModes()
{
try
{
DisplayMode[] modes = Display.getAvailableDisplayModes();
for (int i = 0; i < modes.length; i++)
{
if (modes[i].getWidth() == gameWindowWidth && modes[i].getHeight() == gameWindowHeight && modes[i].isFullscreenCapable())
{
displayModeFullScreen = modes[i];
}
}
displayModeWindowed = new DisplayMode(gameWindowWidth, gameWindowHeight);
}
catch (LWJGLException ex)
{
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
/*
* if the game ends destroy the display
*/
private static void destroyDisplay()
{
Display.destroy();
}
/*
* The methode that switches between the display modes
*/
private static void switchFullScreen()
{
try
{
if(!fullScreen)
{
Display.setDisplayMode(displayModeFullScreen);
fullScreen = true;
}
else
{
Display.setDisplayMode(displayModeWindowed);
fullScreen = false;
}
}
catch (LWJGLException ex)
{
Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
我的游戏课程
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package GameTest;
import org.newdawn.slick.opengl.Texture;
import static RetinaEngine.RetinaDraw.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import org.lwjgl.opengl.Display;
import org.newdawn.slick.opengl.TextureLoader;
/**
*
* @author Jesse
*/
public class Game {
private Texture terror;
public void Game() {
try {
terror = TextureLoader.getTexture("PNG", new FileInputStream(new File("res/terror.png")));
// Replace PNG with your file extension
} catch (FileNotFoundException e) {
e.printStackTrace();
Display.destroy();
System.exit(1);
} catch (IOException e) {
e.printStackTrace();
Display.destroy();
System.exit(1);
}
}
/*
* Get user input in our Game
*/
public void getUserInput()
{
}
/*
* Update all the game objects
*/
public void updateGame()
{
}
/*
* Render the game
*/
public void renderGame()
{
drawTexture(0, 0, 128, 128, 0, terror);
}
}
绘图功能
public static void drawTexture(float x, float y, float width, float height, float rotation, Texture texture)
{
Texture tex = texture;
glPushMatrix();
{
glTranslatef(x, y, 0);
glRotatef(rotation, 0, 0, 1);
Color.white.bind();
tex.bind();
//glBindTexture(GL_TEXTURE_2D, tex.getTextureID());
glBegin(GL_QUADS);
glTexCoord2f(0,0);
glVertex2f(-width / 2, -height / 2);
glTexCoord2f(0,1);
glVertex2f(-width / 2, height / 2);
glTexCoord2f(1,1);
glVertex2f( width / 2, height / 2);
glTexCoord2f(1,0);
glVertex2f( width / 2, -height / 2);
glEnd();
}
glPopMatrix();
}