OpenGL纹理倾斜 [英] OpenGL texture tilted

问题描述

当我在OpenGL中加载纹理并且每个像素有一个(GL_ALPHA)或三个分量(GL_RGB)时，该纹理看起来是倾斜的.是什么使这种情况发生的?

When I load a texture in OpenGL and this has one (GL_ALPHA) or three components per pixel (GL_RGB), the texture appears tilted. What makes this happen?

作为其他细节，关系的宽度/高度似乎会受到影响.例如，正确映射1920x1080(16/9)的图像时，1366x768(683/384)的图像会出现倾斜.

As additional detail, the relation width/height seems to affect. For example, an image of 1366x768(683/384) appears tilted while an image of 1920x1080(16/9) is mapped correctly.

推荐答案

这可能是填充/对齐问题.

This is probably a padding/alignment issue.

GL默认情况下期望将像素行填充为4字节的倍数.具有1字节或3字节宽像素的1366宽纹理自然不会对齐4字节.

GL, by default, expects rows of pixels to be padded to a multiple of 4 bytes. A 1366 wide texture with 1 byte or 3 byte wide pixels, will not be naturally 4 byte aligned.

可能的解决方法是:

• 使用(例如)glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
告诉GL如何包装纹理
• 更改纹理的尺寸，以使填充区域匹配而不更改任何内容
• 更改纹理的加载，以使填充与GL期望的一致

• Tell GL how your texture is packed, using (for example) glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
• Change the dimensions of your texture, such that the padding matches without changing anything
• Change the loading of your texture, such that the padding is consistent with what GL expects

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