ios - GLKView : Trouble with offscreen RenderBuffer with Core Animation Layer -


i trying attach renderbuffer following apples guide here.

my problem if try create fbo way, 2 scenarios happen :

a) if draw thing or call self.binddrawable() prior renderbufferstorage(_:_:), renderbufferstorage return false, whole thing fails

b) if run 2 functions below before call binddrawable or draw anything, renderbuffer created, error when try draw :

failed bind eagldrawable: gl_renderbuffer 2 failed make complete framebuffer object 8cd6

private func initframebuffer() -> gluint {     var framebuffer_id: gluint = 0     glgenframebuffers(1, &framebuffer_id)     glbindframebuffer(glenum(gl_framebuffer), framebuffer_id)     return framebuffer_id }  private func initrenderbuffer() -> gluint {     var renderbuffer_id: gluint = 0     glgenrenderbuffers(1, &renderbuffer_id);     glbindrenderbuffer(glenum(gl_renderbuffer), renderbuffer_id);     let status = context.renderbufferstorage(int(gl_renderbuffer), from: layer as! caeagllayer)     glframebufferrenderbuffer(glenum(gl_framebuffer), glenum(gl_color_attachment0), glenum(gl_renderbuffer), renderbuffer_id)     return renderbuffer_id }

i sat glkview such :

    context               = eaglcontext(api: .opengles3)     drawablecolorformat   = .rgba8888


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