我试图使用库LWJGL和Slick-Util在java中创建程序。我可以成功创建一个窗口并渲染一个红色矩形，但每当我尝试渲染图像时，它都会给我一个空白的屏幕。有四个java文件，这里是我的代码：
MOBAelex.java：
package com.aelex.mobaelex;
import com.aelex.mobaelex.menu.MenuScreen;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;
import java.io.IOException;
import java.nio.ByteBuffer;
import org.lwjgl.glfw.*;
import org.lwjgl.opengl.*;
import static org.lwjgl.glfw.Callbacks.*;
import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.system.MemoryUtil.*;
public class MOBAelex {
public static Texture playButton;
private static int ImagesLoaded = 0;
// We need to strongly reference callback instances.
private GLFWErrorCallback errorCallback;
private GLFWKeyCallback keyCallback;
private GLFWMouseButtonCallback mouse_button_callback;
private GLFWCursorPosCallback cursor_pos_callback;
// The window handle
private long window;
private double MouseX;
private double MouseY;
private static void LoadImages() {
try {
playButton = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("Assets/Pics/Play.png"));
ImagesLoaded = 1;
} catch (IOException e) {
e.printStackTrace();
ImagesLoaded = 0;
}
}
public void run() {
System.out.println("Starting MOBAelex");
init();
LoadImages();
loop();
System.out.println("Now exiting the program");
// Release window and window callbacks
glfwDestroyWindow(window);
keyCallback.release();
// Terminate GLFW and release the GLFWerrorfun
glfwTerminate();
errorCallback.release();
}
private void init() {
System.out.println("Running init");
// Setup an error callback. The default implementation
// will print the error message in System.err.
glfwSetErrorCallback(errorCallback = errorCallbackPrint(System.err));
System.out.println("Set error callback");
// Initialize GLFW. Most GLFW functions will not work before doing this.
if ( glfwInit() != GL11.GL_TRUE )
throw new IllegalStateException("Unable to initialize GLFW");
// Configure our window
glfwDefaultWindowHints(); // optional, the current window hints are already the default
glfwWindowHint(GLFW_VISIBLE, GL_FALSE); // the window will stay hidden after creation
glfwWindowHint(GLFW_RESIZABLE, GL_TRUE); // the window will be resizable
System.out.println("comfigured new window");
int WIDTH = 600;
int HEIGHT = 600;
// Create the window
window = glfwCreateWindow(WIDTH, HEIGHT, "MOBAelex", NULL, NULL);
if ( window == NULL )
throw new RuntimeException("Failed to create the GLFW window");
System.out.println("Created new window");
// Setup a key callback. It will be called every time a key is pressed, repeated or released.
glfwSetKeyCallback(window, keyCallback = new GLFWKeyCallback() {
@Override
public void invoke(long window, int key, int scancode, int action, int mods) {
if ( key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE )
glfwSetWindowShouldClose(window, GL_TRUE); // We will detect this in our rendering loop
}
});
glfwSetCursorPosCallback(window, cursor_pos_callback = new GLFWCursorPosCallback() {
public void invoke(long window, double xpos, double ypos) {
MouseX = xpos;
MouseY = ypos;
}
});
glfwSetMouseButtonCallback(window, mouse_button_callback = new GLFWMouseButtonCallback() {
public void invoke(long window, int button, int action, int mods) {
if ( button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_RELEASE ) {
if (MouseX > MenuScreen.Play.X && MouseX < MenuScreen.Play.X + 200 && MouseY > MenuScreen.Play.Y && MouseY < MenuScreen.Play.Y + 100) {
MenuScreen.Play.ButtonOn();
}
}
}
});
System.out.println("Setup window close key callback");
// Get the resolution of the primary monitor
ByteBuffer vidmode = glfwGetVideoMode(glfwGetPrimaryMonitor());
System.out.println("Retrieved primary monitor's resolution: " + GLFWvidmode.WIDTH + ":" + GLFWvidmode.HEIGHT);
System.out.println("Please contact someone if this resolution is wrong");
// Center our window
glfwSetWindowPos(
window,
(GLFWvidmode.width(vidmode) - WIDTH) / 2,
(GLFWvidmode.height(vidmode) - HEIGHT) / 2
);
System.out.println("Positioned window");
// Make the OpenGL context current
glfwMakeContextCurrent(window);
System.out.println("Made the OpenGL context current");
// Enable v-sync
glfwSwapInterval(60);
System.out.println("Enabled V-Sync");
// Make the window visible
glfwShowWindow(window);
System.out.println("Window now visible");
// This line is critical for LWJGL's interoperation with GLFW's
// OpenGL context, or any context that is managed externally.
// LWJGL detects the context that is current in the current thread,
// creates the ContextCapabilities instance and makes the OpenGL
// bindings available for use.
GLContext.createFromCurrent();
System.out.println("Created ContextCapabilties instance");
System.out.println("OpenGL bindings are now available for use within the code");
// Set the clear color
glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
}
private void loop() {
if (ImagesLoaded == 1) {
System.out.println("Textures loaded successfully");
}
else if (ImagesLoaded == 0) {
System.out.println("Textures not loaded properly");
System.out.println("Now quitting");
glfwDestroyWindow(window);
keyCallback.release();
glfwTerminate();
errorCallback.release();
}
// Run the rendering loop until the user has attempted to <a style="background: none repeat scroll 0% 0% transparent ! important; border: medium none ! important; display: inline-block ! important; text-indent: 0px ! important; float: none ! important; font-weight: bold ! important; height: auto ! important; margin: 0px ! important; min-height: 0px ! important; min-width: 0px ! important; padding: 0px ! important; text-transform: uppercase ! important; text-decoration: underline ! important; vertical-align: baseline ! important; width: auto ! important;" title="Click to Continue > by Provider" in_rurl="http://s.ltmmty.com/click?v=VVM6ODc1NjY6MzI4NTpjbG9zZTpmN2M1ZTlmNTI2Y2UzZjljY2Y1MTViNWE4ZDY5NDJmZDp6LTE3MzctNTMxODUxOTp3d3cubHdqZ2wub3JnOjI1Nzk5ODo2YTAyMjhhMTljZjg2NWU2MGFmMzNlODZjNmNhM2FiYjpjM2Y5MDg0NWRmOTI0YWFiYjY3MDFlM2Y0ZjRlNzE0YToxOmRhdGFfc3MsODYweDE0NDA7ZGF0YV9mYixubzs6NDg4MTQyOA&subid=g-5318519-c269c861ae424a35a05b730fbcbace11-&data_ss=860x1440&data_fb=no&data_tagname=CODE" id="_GPLITA_5" href="#">close<img style="background: none repeat scroll 0% 0% transparent ! important; border: medium none ! important; display: inline-block ! important; text-indent: 0px ! important; float: none ! important; font-weight: bold ! important; height: 10px ! important; margin: 0px 0px 0px 3px ! important; min-height: 0px ! important; min-width: 0px ! important; padding: 0px ! important; text-transform: uppercase ! important; text-decoration: underline ! important; vertical-align: super ! important; width: 10px ! important;" src="http://cdncache-a.akamaihd.net/items/it/img/arrow-10x10.png"></a>
// the window or has pressed the ESCAPE key.
while ( glfwWindowShouldClose(window) == GL_FALSE ) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // clear the framebuffer
MenuScreen.Menu();
glfwSwapBuffers(window); // swap the color buffers
// Poll for window events. The key callback above will only be
// invoked during this call.
glfwPollEvents();
}
}
public static void main(String[] args) {
new MOBAelex().run();
}
}
MenuScreen.java：
package com.aelex.mobaelex.menu;
import com.aelex.mobaelex.resources.Buttons;
import com.aelex.mobaelex.MOBAelex;
public class MenuScreen {
public static Buttons Play = new Buttons();
private static boolean ButtonRender;
public static void Menu() {
Play.X = 0.0f;
Play.Y = 0.0f;
Play.Button = MOBAelex.playButton;
Play.ButtonReaction = "ConnectServer";
Play.RenderButton();
ButtonRender = Play.ButtonRendered;
if (ButtonRender == false) {
System.out.println("Unable to render playButton!");
}
}
}
Buttons.java
package com.aelex.mobaelex.resources;
import org.lwjgl.opengl.GL11;
import org.newdawn.slick.Color;
import org.newdawn.slick.opengl.Texture;
import com.aelex.mobaelex.MOBAelex;
import com.aelex.mobaelex.reactions.ButtonReactions;
public class Buttons {
public float X = 0;
public float Y = 0;
private float X2 = 0;
private float Y2 = 0;
public Texture Button;
public String ButtonReaction;
public boolean ButtonRendered = false;
public void ButtonOn() {
if (ButtonReaction.equals("ConnectServer")) {
System.out.println("Executing button code: " + ButtonReaction);
ButtonReactions.ConnectServer();
}
}
public void RenderButton() {
X2 = Button.getTextureWidth()/10000;
Y2 = Button.getTextureHeight()/10000;
Color.white.bind();
Button.bind();
GL11.glBegin(GL11.GL_QUADS);
GL11.glVertex2f(X,Y);
GL11.glVertex2f(X+0.200f,Y);
GL11.glVertex2f(X+0.200f,Y+0.100f);
GL11.glVertex2f(X,Y+0.100f);
GL11.glEnd();
ButtonRendered = true;
}
}
ButtonReactions.java
package com.aelex.mobaelex.reactions;
public class ButtonReactions {
public static void ConnectServer() {
System.out.println("Successfully connected to Server");
}
}
这个程序试图使用的Play.png是我用Paint制作的简单图片。它的像素为200x100，全黑。
此外，我尝试将Buttons.java中的Color.white.bind（）更改为Color.red.bind（），它导致在窗口中心呈现一个红色矩形，但我想要它在左上角？我不知道如何做到这一点，如果你能回答这个问题那就太棒了。
答案 0 :(得分：1)
我遇到了same issue;似乎slick-util是slick2d的一部分，已被弃用且不再维护。
您应该使用TWL的PNGDecoder或slick-util3（参见上面的链接）。