List of alternatives for functions missing in OpenGLES

Question

There are number of functions that exist in OpenGL but not in OpenGLES 1.1 (for iPhone).

Is there a list or resource that lists some alternative functions that can be used in OpenGLES 1.1?

For example:

• gluOrtho2D
• glPolygonMode
• glVertex3f
• etc

Answer 1

The "OpenGL ES 1.1.12 Difference Specification" (http://www.khronos.org/registry/gles/specs/1.1/es_cm_spec_1.1.12.pdf) lists the differences between OpenGL ES 1.X and OpenGL 1.5.

The iPhone uses OpenGL ES 1.1

I would also recommend you make a list of the OpenGL functions you call and check the ES documentation to see if they are wholly/partially supported.

Answer 2

from the man page for gluOrtho2D

DESCRIPTION

gluOrtho2D sets up a two-dimensional orthographic viewing
region. This is equivalent to calling glOrtho with near=-1
and far=1.

Instead of using glVertex3f you must use Vertex Arrays see link