从也是渲染目标的纹理中采样
我知道这在技术上不受支持（据我所知，这是未定义的行为），但是从也被写入的纹理中采样真的是一件非常可怕的事情吗？
我问这个问题是因为我需要从深度纹理中读取数据，我也需要写入该深度纹理，如果我不能这样做，这意味着我将不得不复制深度纹理，如果这没什么大不了的，我就不会这样做。没有看到简单复制它的危害吗？
感谢您的帮助！
I know this technically isn't supported (and as far as I can tell it's undefined behavior) but is it really a fatally horrible thing to sample from a texture which is also being written to?
I ask because I need to read from a depth texture which I also need to write to, if I can't do this it means I will have to copy the depth texture and if it isn't that big of a deal I don't see the harm in simply copying it?
Thanks for any help!
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是的，它是致命的并会引发未定义的行为。只需制作一份副本并从副本中读取即可。
解释很简单。由于片段以未指定的顺序并行处理，因此您可能正在从已写入的纹素或原始值纹素中读取，并且无法知道您正在读取的内容。制作副本并从中读取可确保您读取到正确的值。
Yes, it's fatal and triggers undefined behaviour. Just make a copy and read from the copy.
The explanation is simple. Since fragments are processed in parallel in a unspecified order, you might be reading from already written texels or original value texels, and there is no way of knowing what you are reading. Making a copy and reading from it ensures that you will read the correct values.
马蒂亚斯和戈兹涵盖了最重要的部分。让我添加几个有趣的事实：
Matias and Goz covered the most important bits. Let me add a couple interesting facts: