iPhone GLES 2 Orthogonal frame

Posts: 9
Joined: 2010.04
Post: #1
Hey there is there a way to forze the othogonal frame to more easily to manage coordinates?

right now i have it (more like opengl has it) default as 2d rendering at -1 1 and -1 1 in xy how can I change it to more 2d friend 0 1 - 0 1 xy?

I remember doing that using glotho back in the day but how does it work now that glortho does not exist? Blink

Thanks In Advance!
Quote this message in a reply
Posts: 9
Joined: 2010.04
Post: #2

I got it

I had to multiply by a matrix inside the shader in order to get the correct coordinates Rasp

in this case

Quote this message in a reply
Posts: 19
Joined: 2010.03
Post: #3
hi, this page[1] describes the glOrtho function and the matrix it generates. You are better off loading that matrix into your shader (once per frame) rather then offsetting the default for every vertex that comes through the shader (if I understand your post correctly).

hope that helps.

[1] - http://www.cs.utk.edu/~vose/c-stuff/opengl/glOrtho.html
Quote this message in a reply
Post Reply 

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Texturing using gles 2 jeckil 4 5,629 Apr 20, 2010 03:42 PM
Last Post: jeckil
  Setting A Non-Rectangular Clip Area In GLES muleskinner 5 3,778 Oct 20, 2009 01:03 AM
Last Post: muleskinner
  [Problem] Loading image with OpenGL orthogonal view pixel-to-pixel Lexis 2 3,685 Aug 21, 2009 01:35 AM
Last Post: Lexis