callback for attributes to pass to eglGetPlatformDisplay. May be NULL.
callback for attributes to pass to eglCreateSurface. May be NULL.
callback for attributes to pass to eglCreateContext. May be NULL.
a pointer that is passed to the callbacks.
Threadsafety: This function should only be called on the main thread.
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Sets the callbacks for defining custom EGLAttrib arrays for EGL initialization.
Callbacks that aren't needed can be set to NULL.
NOTE: These callback pointers will be reset after SDL_GL_ResetAttributes.