iPhone native application to iPad

i would like to port my application (pure OpenGL ES based) on the iPad

currently it runs in ipad on some kind of compatibility mode, where i can scale it to 2x

however i want to have it native, not launching in 1 / 2 resolution (btw iam getting the screen size from the renderbuffer)

gl开发者_如何学编程GetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_WIDTH_OES, &backingWidth);
glGetRenderbufferParameterivOES(GL_RENDERBUFFER_OES, GL_RENDERBUFFER_HEIGHT_OES, &backingHeight); 

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Just in project properties, set the key Target device family to iPhone/iPad