There are two paths into OpenGL ES on the iPhone.
You can bite the bullet and create an Xcode project by selecting the template
“OpenGL ES Application”
rather than
“Window-based Application”.
This will create the app with the bouncing square.
Here
is a
.zip
file of this project and a commentary on its major files:
the application delegate, the view controller, the eagle view,
and the two little shader programs.
Or you could download two
.zip
files containing two dozen files from the
home page
of the
OpenGL SuperBible.
Use them to make a simple program that
runs on a Mac.
Then
port the program
to the iPhone.
It draws a stationary red triangle on a blue background.
The advantage of using the SuperBible is that you only have to
concern yourself with one file,
Triangle.cpp.
The other files—the view controller and the eagle view—require
only trivial modifications to accomodate
Triangle.cpp.
The disadvantage of the SuperBible is that you have to add many
.cpp and .h
files to your project, and even one
lib.a
file.
But I have already created a project for you
here
containing all of these files, plus
Triangle.cpp.
You can help yourself to the
.zip
file of this project,
modify
Triangle.cpp,
and leave the other files untouched.