如何在OpenGL ES 2.0着色器中处理NaN或inf [英] How to deal with NaN or inf in OpenGL ES 2.0 shaders

问题描述

这基于以下问题:检测NaN的最佳方法OpenGL着色器

标准GLSL定义了isnan()和isinf()函数以进行检测. OpenGL ES 2.0着色语言没有.尽管如此，我该如何处理NaN和Infs?

This is based on the question: Best way to detect NaN's in OpenGL shaders

Standard GLSL defines isnan() and isinf() functions for detection. OpenGL ES 2.0 shading language doesn't. How can I deal with NaNs and Infs nevertheless?

推荐答案

您可以通过仅适用于NaN的条件来检查NaN:

You can check for NaN via a condition that will only be true for NaN:

bool isNan(float val)
{
  return (val <= 0.0 || 0.0 <= val) ? false : true;
}

isinf有点困难.没有机制可以将浮点数转换为其整数表示形式并使用位.因此，您必须将它与一个适当的大数字进行比较.

isinf is a bit more difficult. There is no mechanism to convert the float into its integer representation and play with the bits. So you'll have to compare it against a suitably large number.

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