Question

我有一个问题，似乎是将纹理绑定到一个形状。当我这样做时，我会得到正确尺寸的白色形状，Color.white.bind()给出的颜色。

GraphicsManager.java

package com.jackwilsdon.spectrun;

import java.io.IOException;

import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.vector.Vector2f;
import org.newdawn.slick.Color;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;

public class GraphicsManager {

    final static int WIDTH = 800;
    final static int HEIGHT = 600;

    private static Texture cloudTexture = null;

    public static void initDisplay() throws LWJGLException
    {
        Display.setDisplayMode(new DisplayMode(WIDTH, HEIGHT));
        Display.create();
    }

    public static void initOpenGL()
    {     
        GL11.glMatrixMode(GL11.GL_PROJECTION);
        GL11.glLoadIdentity();
        GL11.glOrtho(0, WIDTH, 0, HEIGHT, 1, -1);
        GL11.glMatrixMode(GL11.GL_MODELVIEW);
    }

    public static void loadTextures()
    {
        Texture currentObject = null;
        try {
            currentObject = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("./resources/cloud.png"));
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("Texture loaded: "+currentObject);
        System.out.println(">> Image width: "+currentObject.getImageWidth());
        System.out.println(">> Image height: "+currentObject.getImageHeight());
        System.out.println(">> Texture width: "+currentObject.getTextureWidth());
        System.out.println(">> Texture height: "+currentObject.getTextureHeight());
        System.out.println(">> Texture ID: "+currentObject.getTextureID());
        cloudTexture = currentObject;
    }

    public static void DrawRectangle(int x, int y, int width, int height)
    {
        GL11.glBegin(GL11.GL_QUADS);
            GL11.glVertex2f(x,y);
            GL11.glVertex2f(x+width,y);
            GL11.glVertex2f(x+width,y+height);
            GL11.glVertex2f(x,y+height);
        GL11.glEnd();
    }

    public static void DrawRectangle(int x, int y, int width, int height, int red, int green, int blue)
    {
        GL11.glColor3ub((byte)red, (byte)green, (byte)blue);
        DrawRectangle(x, y, width, height);
    }

    public static Vector2f DrawCloud(int x, int y)
    {
        cloudTexture.bind();
        int width = cloudTexture.getImageWidth();
        int height = cloudTexture.getImageHeight();
        GL11.glBegin(GL11.GL_QUADS);
            GL11.glVertex2f(x,y);
            GL11.glVertex2f(x+width,y);
            GL11.glVertex2f(x+width,y+height);
            GL11.glVertex2f(x,y+height);
        GL11.glEnd();
        return new Vector2f(cloudTexture.getImageWidth(), cloudTexture.getImageHeight());
    }
}

我怀疑它与我的initOpenGL()方法有关，就像我看过的一个例子（http://ninjacave.com/slickutil1），他们的情况非常不同。只是将他们复制到我的手中会产生意想不到的结果（黑屏）。我的initOpenGL()方法缺少某些内容吗？

编辑：loadTextures()方法输出正确的图像尺寸，但纹理的尺寸不同，这是什么意思？

编辑2：PNG不是问题，我已经尝试了其他2个人来找到相同的结果。

修复代码后，通过设置纹理坐标，出现了一个新问题。我现在得到一个奇怪的效果，像这样; i.imgur.com/5lr79.png。图像不再是全尺寸，并且左下角有一个黑框。

GraphicsManager.java

package com.jackwilsdon.spectrun;

import java.io.IOException;

import org.lwjgl.LWJGLException;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.vector.Vector2f;
import org.newdawn.slick.Color;
import org.newdawn.slick.opengl.Texture;
import org.newdawn.slick.opengl.TextureLoader;
import org.newdawn.slick.util.ResourceLoader;

public class GraphicsManager {

    final static int WIDTH = 800;
    final static int HEIGHT = 600;

    private static Texture cloudTexture = null;

    public static void initDisplay() throws LWJGLException
    {
        Display.setDisplayMode(new DisplayMode(WIDTH, HEIGHT));
        Display.create();
    }

    public static void initOpenGL()
    {    
        GL11.glEnable(GL11.GL_TEXTURE);  
        GL11.glMatrixMode(GL11.GL_PROJECTION);
        GL11.glLoadIdentity();
        GL11.glOrtho(0, WIDTH, 0, HEIGHT, 1, -1);
        GL11.glMatrixMode(GL11.GL_MODELVIEW);
    }

    public static void loadTextures()
    {
        Texture currentObject = null;
        try {
            currentObject = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("./resources/cloud.png"));
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("Texture loaded: "+currentObject);
        System.out.println(">> Image width: "+currentObject.getImageWidth());
        System.out.println(">> Image height: "+currentObject.getImageHeight());
        System.out.println(">> Texture width: "+currentObject.getTextureWidth());
        System.out.println(">> Texture height: "+currentObject.getTextureHeight());
        System.out.println(">> Texture ID: "+currentObject.getTextureID());
        cloudTexture = currentObject;
    }

    public static void DrawRectangle(int x, int y, int width, int height)
    {
        GL11.glBegin(GL11.GL_QUADS);
            GL11.glVertex2f(x,y);
            GL11.glVertex2f(x+width,y);
            GL11.glVertex2f(x+width,y+height);
            GL11.glVertex2f(x,y+height);
        GL11.glEnd();
    }

    public static void DrawRectangle(int x, int y, int width, int height, int red, int green, int blue)
    {
        GL11.glColor3ub((byte)red, (byte)green, (byte)blue);
        DrawRectangle(x, y, width, height);
    }

    public static Vector2f DrawCloud(int x, int y)
    {
        cloudTexture.bind();
        int width = cloudTexture.getImageWidth();
        int height = cloudTexture.getImageHeight();
        GL11.glBegin(GL11.GL_QUADS);
            GL11.glTexCoord2f(1,1);
            GL11.glVertex2f(x,y);
            GL11.glTexCoord2f(0,1);
            GL11.glVertex2f(x+width,y);
            GL11.glTexCoord2f(0,0);
            GL11.glVertex2f(x+width,y+height);
            GL11.glTexCoord2f(1,0);
            GL11.glVertex2f(x,y+height);
        GL11.glEnd();
        return new Vector2f(cloudTexture.getImageWidth(), cloudTexture.getImageHeight());
    }
}

Answer 1

您没有调用GL11.glEnable（GL11.GL_TEXTURE）并且您也没有设置任何纹理坐标也没有用。

这两个都会让你在四边形上看到纹理的能力变得更糟......

Answer 2

我确实认为对bind（）的调用需要在你的glBegin（）和glEnd（）之间调用才能使它坚持下去。尺寸问题有点奇怪 - 也许你的纹理尺寸不是2的幂，它是由驾驶员翻译的？

Answer 3

你首先没有启用gl_TEXTURE_2D。其次，你需要在glBegin（）和你的glEnd（）中调用.bind（）。第三，你需要纹理坐标。因此，对于左上边缘，它将是'glTexCoord（0,0）'，下一个将是'（1,0）'然后'（1,1）'和最后'（0,1）'

Answer 4

不要忘记在需要时调用TextureImpl.unbind。

纹理在OpenGL中没有绑定（LWJGL / Slick-util）

4 个答案: