I want to know when the scene drawing is completed.

OpenGL OpenGL: Basic Coding
1

I must know when the scene drawing is completed.

Because after the drawing is completed,

I want to run glReadPixels.

Does it exist the flag that can check

whether the scene is completed ?

Plz Help me~~~~-

2

I must know when the scene drawing is completed.
Because after the drawing is completed,

I want to run glReadPixels, rotate the model

and redraw…Do you understand my situation?

Does it exist the flag that can check

whether the scene is completed ?

Plz Help me~~~~-

3

call glFinish()
this guarantees (I am pretty sure)
that all gl calls have finished

no flag (to my knowledge)

4

glFinish() blocks until it’s complete. hence, no need for a flag.

cheers,
John