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CreateProgram

Helper function to create and register in renderer custom shader programs.

To function properly ProgramClass should have method declared as static ProgramClass *Create(IReleasableListener*, NativeGraphicsClass*) and this function should be made a friend of ProgramClass.

The first argument should be set in ProgramClass constructor as release listener. It is recommended that ProgramClass be derived from IReleasable/CReleasable for this purpose.

The second argument will be the native graphics class used by renderer and thus should be named by NativeGraphicsClass.

If ProgramClass::Create() fails it should return nullptr.

CreateProgram() function return nullptr if "renderer" argument is missing, or renderer's native graphics isn't an instance of NativeGraphicsClass, or ProgramClass::Create() returns nullptr.

In case of using with custom renderers the function should be made a friend of that renderer in order to have access to its protected methods.

template<class ProgramClass, class RendererClass, class NativeGraphicsClass>
IProgram *CreateProgram(RendererClass *renderer);