问题描述
我看过使用这些类型的不同代码片段，但我还没有看到他们是否在一些<标准头文件>或者只是在本地头文件或甚至在文件级别定义。
I've seen different code snippets using these types, but I haven't seen if they are defined in some <standard header file> or just defined in a "local header file" or even at file level.
所以，我想知道是否有定义这些类型的标准头文件？
So what Im wondering is: Is there any standard header file that defines these types? Or is there some standard definitions that everyone uses that I should copy?
我想这些类型的一个可能和常见的用法是代表坐标，我错了吗？
I guess that a possible and common use to these types are representing coordinates, am I wrong?
如果我想用这些来表示网格中的位置，还有什么我应该考虑的吗？为什么或为什么不使用它们的原因？
Is there anything else I should think about if I want to use these to represent positions in a grid? Any reasons why or why not to use them?
编辑：
澄清：int2表示一对int ，float3表示浮点数的三元组。
Clarification: int2 means a pair of ints, float3 means a triplet of floats.
如果这些类型是预定义的，那么使用它们将是很好的，而不必从头开始写，包括标准代数函数操作符+，操作符等）。
If these types were predefined somewhere it would be nice to use them instead of having to write it from scratch including the standard algebraic functions (operator+, operator-, etc.).
推荐答案
这些类型不是标准C ++的一部分。
These types aren't a part of standard C++. They might either be defined in some third-party library, or you're looking at some other dialect or language.
GPU代码（着色器语言，如GLSL，Cg或其他语言） HLSL或GPGPU的东西，如CUDA或OpenCL）通常定义类似这样的类型，作为相应SIMD数据类型的名称。
GPU code (Shader languages such as GLSL, Cg or HLSL, or GPGPU stuff like CUDA or OpenCL) typically defines types like these though, as names for the corresponding SIMD datatypes.
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