OpenGL的如何单元测试？ [英] OpenGL How to unit test?

问题描述

有没有单元测试的好方法函数或使用OpenGL命令一类？

Is there a good way to unit test a function or a class using OpenGL commands?

对于C ++，我知道我可以做类的模板，并通过一类做直接的OpenGL调用：

For c++, I know I could make the class a template and pass a class doing direct opengl calls :

namespace myNamespace
{
struct RealOpenglCall
{
  static inline void glVertex2fv( const GLfloat * v)
  { ::glVertex2fv( v ); }
};

template< typename T >
class SomeRendering
{
  public:
    SomeRendering() : v()
    {
      // set v
    }
    void Draw()
    {
      T::glVertex2fv(v);
    }
    GLfloat v[4];
};

}

在C和C ++中，我可以通过函数指针调用函数OpenGL函数（当时为单位检测合格的指针模拟功能）。

In C and c++, I could pass function pointers to functions calling opengl functions (then for unit testing passing pointers to mock functions).

我也可以用不同的库（而不是OpenGL的）联系，但是这听起来像一个大的并发症。

I could also link with different library (instead of opengl), but that sounds like a big complication.

那么，什么是其他技术进行单元测试code调用OpenGL函数？

So, what are other techniques to unit test code calling opengl functions?

推荐答案

下面是一个不错的把戏我学到了一会儿回来。您可以使用普通的旧的#define s到让你模拟各种API函数：

Here is a nice trick i learned a while back. You can use regular old #defines to let you mock all kinds of API functions:

#ifdef _test_
#define glVertex3f(x,y,z)  (mockGlVertex3f((x),(y),(z)))
...
#endif

通过配置的preprocessor。有没有必要改变你的绘图功能都没有。另外：你可以实现 mockGlVertex3f 以这样一种方式，它如检查参数或计数调用它然后可以稍后进行检查的数目

With a configured preprocessor. There is no need to change your drawing-functions at all. Further: you can implement mockGlVertex3f in such a way that it e.g. checks the arguments or counts the number of calls to it which can then later be checked.

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