void SelectOffScreenDevice()
Select off-screen device for rendering.
void SwapBuffers()
Swap front/back buffers.
void ReadGLBuffer()
Read gl buffer into x-pixmap.
void MarkForDirectCopy(Bool_t isDirect)
Mark gl-device for later copying into x-pixmap.
Allow plot-painters to be used for gl-inpad and gl-viewer.
void ExtractViewport(Int_t *vp) const
Extract viewport from gl.
Bool_t MakeCurrent()
Set as current GL context.