Subtle OpenGL Projection Matrix Difference Between iPhone Simulator and Device

Anthony Caliendo, Tuesday, December 2, 2008 @ 6:27 pm

If you are deploying to the iPhone simulator instead of to a device, you can get away with not loading the identity matrix for the projection matrix so long as you do not want to draw over any bound textures which are drawn.  However, on an iPhone device, you will notice some serious artifacting if you attempt this.  The artifacts will be related to the last drawn textures, even if they were drawn from a different application (except if the phone was turned off in the interim, in which case you will get a black strobe effect).

This implies that the simulator loads the identity matrix automatically for GL_PROJECTION when loading your application, where as the iPhone itself will maintain the matrix's state between applications.

Related Services: iPhone Application Development, Custom Software Development

Related posts:

1. iPhone: Using Pre-processor Directives for Device Testing
2. TankEngine: New plugin for Rails iPhone Development
3. “Developing iPhone applications using Ruby on Rails and Eclipse, Part 2: Displaying iPhone content to the client” Also up on IBM Developerworks
4. “Developing iPhone applications using Ruby on Rails and Eclipse, Part 3: Developing advanced views for iPhone” now available on IBM Developerworks
5. iPhone SDK: Testing with TextMate & GTM

Comments (0)

Software Development

Comments

• Leave a comment
• Comment feed for this post
• TrackBack URL

None so far.

Leave a comment