纹理不能正确拉伸。这是为什么发生？ [英] Texture doesn't stretch properly. Why is this happening?

问题描述

我使用LWJGL和Slick框架将纹理加载到我的OpenGL应用程序中。我使用此映像：

此代码导入并使用纹理：

  flagTexture = TextureLoader.getTexture（PNG，ResourceLoader.getResourceAsStream（japan.png））; 
  

......

  flagTexture.bind（）; 
 
 GL11.glColor3f（1.0f，1.0f，1.0f）; 
 GL11.glPushMatrix（）; 
 
 GL11.glTranslatef（0.0f，0.0f，-10.0f）; 
 
 GL11.glBegin（GL11.GL_QUADS）; 
 GL11.glTexCoord2f（0.0f，0.0f）; 
 GL11.glVertex2f（0.0f，0.0f）; 
 GL11.glTexCoord2f（1.0f，0.0f）; 
 GL11.glVertex2f（2.5f，0.0f）; 
 GL11.glTexCoord2f（1.0f，1.0f）; 
 GL11.glVertex2f（2.5f，2.5f）; 
 GL11.glTexCoord2f（0.0f，1.0f）; 
 GL11.glVertex2f（0.0f，2.5f）; 
 GL11.glEnd（）; 
 
 GL11.glPopMatrix（）; 
  

但最终结果变成这样：

我没有使用任何特殊设置，例如GL_REPEAT或类似的东西。这是怎么回事？如何让纹理填充给定的顶点？

二。这里有两种解决方案：

1. 将纹理拉伸至最接近的两个幂。


2. 计算纹理的大小和最接近的两个幂之间的差异，并将纹理坐标从 1.0f 更改为 textureWidth / nearestPowerOfTwoWidth 和 textureHeight / nearestPowerOfTwoHeight 。

也可能有一些特定的LWJGL方法以允许两个非功率的纹理，看看。

I'm using LWJGL and Slick framework to load Textures to my OpenGL-application.

I'm using this image:

And this code to import and utilize the texture:

    flagTexture = TextureLoader.getTexture("PNG", ResourceLoader.getResourceAsStream("japan.png"));

......

    flagTexture.bind();

    GL11.glColor3f(1.0f, 1.0f, 1.0f);
    GL11.glPushMatrix();

    GL11.glTranslatef(0.0f, 0.0f, -10.0f);

    GL11.glBegin(GL11.GL_QUADS);
    GL11.glTexCoord2f(0.0f, 0.0f);
    GL11.glVertex2f(0.0f, 0.0f);
    GL11.glTexCoord2f(1.0f, 0.0f);
    GL11.glVertex2f(2.5f, 0.0f);
    GL11.glTexCoord2f(1.0f, 1.0f);
    GL11.glVertex2f(2.5f, 2.5f);
    GL11.glTexCoord2f(0.0f, 1.0f);
    GL11.glVertex2f(0.0f, 2.5f);
    GL11.glEnd();

    GL11.glPopMatrix();

But the end-result becomes this:

I'm not using any special settings like GL_REPEAT or anything like that. Whats going on? How can I make the texture fill the given vertices?

解决方案

It looks like the texture is getting padded out to the nearest power of two. There are two solutions here:

1. Stretch the texture out to the nearest power of two.
2. Calculate the difference between your texture's size and the nearest power of two and change the texture coordinates from 1.0f to textureWidth/nearestPowerOfTwoWidth and textureHeight/nearestPowerOfTwoHeight.

There might also be some specific LWJGL method to allow for non-power-of-two textures, look into that.

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