着色器代码中的 for 循环使用硬编码数字但不使用

本文介绍了着色器代码中的 for 循环使用硬编码数字但不使用统一变量的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我在中寻求有关 OpenGL ES 2.0 问题的帮助这个问题.似乎答案对我来说很奇怪.因此，我决定提出这个问题，希望能够了解发生了什么.

I asked for help about an OpenGL ES 2.0 Problem in this question. What seems to be the answer is very odd to me. Therefore I decided to ask this question in hope of being able to understand what is going on.

这是一段错误的顶点着色器代码:

Here is the piece of faulty vertex-shader code:

// a bunch of uniforms and stuff...
uniform int u_lights_active;

void main()
{
    // some code...

    for ( int i = 0; i < u_lights_active; ++i )
    {
        // do some stuff using u_lights_active
    }

    // some other code...
}

我知道这看起来很奇怪，但这实际上是解释问题/错误行为所需的所有代码.

I know this looks odd but this is really all code that is needed to explain the problem / faulty behavior.

我的问题是:为什么当我为 u_lights_active 传入一些大于 0 的值时，循环没有被执行?当我硬编码一些整数时，例如4、不用统一的u_lights_active，它工作得很好.

My question is: Why is the loop not getting executed when I pass in some value greater 0 for u_lights_active? When I hardcode some integer e.g. 4, instead of using the uniform u_lights_active, it is working just fine.

还有一点，它只出现在 Android 上，而不出现在桌面上.我使用 LibGDX 在两个平台上运行相同的代码.

One more thing, this only appears on Android but not on the Desktop. I use LibGDX to run the same code on both platforms.

如果需要更多信息，您可以查看 original问题，但我不想在这里复制和粘贴所有内容.我希望这种保持简短的方法受到赞赏，否则我将复制所有内容.

If more information is needed you can look at the original question but I didn't want to copy and paste all the stuff here. I hope that this approach of keeping it short is appreciated, otherwise I will copy all the stuff over.

我期待一个解释:)

谢谢！

着色器代码中的 for 循环使用硬编码数字但不使用

问题描述

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