Using hardware accelerated 2D on iPhone

Hi! In order to get better framerates for my game, I've decided to look into the OpenGL ES renderer. So far, I've #defined EGL_USEGL before including edgemain.h and make a call to ecd.dsp->Perspective2D(480, 320, true) following the instructions of the "Mix 2D and 3D rendering" sub-section from the "3D helper functions" section at the "Using 3D and OpenGL" tutorial. I placed the call at the very beginning of the ClassMain::OnNextFrame method (don't know if this is OK, though).
I must be doing something wrong, since all I'm getting is a black screen (the game is working, since I can hear the background music). What am I missing?
Thanks in advance for your replies,
--Nacho
I must be doing something wrong, since all I'm getting is a black screen (the game is working, since I can hear the background music). What am I missing?
Thanks in advance for your replies,
--Nacho