[Mesa-dev] Question regarding dri2_egl_display conversion

[Emil Velikov]

On 01/08/14 03:01, Jaeyong Yoo wrote:
> Hello Mesa :-)
> 
> I'm reading the source code and I've got a simple question.
> 
> In egl_dri2.c, I saw the following code:
> 
>     dri2_dpy = disp->DriverData;
> 
> 
> which is casting _EGLDisplay->DriverData to dri2_egl_display *.
> 
> Also, I saw the following code:
> 
>     struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
> 
> which is converting _EDLDisplay * to dri2_egl_display *.
> 
> Are those two things the same?
> 
> I'm trying to find the definition of "function" dri2_egl_display but failed.
> 
Hi Jaeyong,

The function is wrapped with a help of _EGL_DRIVER_STANDARD_TYPECASTS and
_EGL_DRIVER_TYPECAST macros as defined in src/egl/main/egldriver.h

I must admit that personally I find them quite confusing and I tend to check
the preprocessed code just in case :)

-Emil

> Best regards,
> 
> Jaeyong
> 
> 
> 
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