What am I doing wrong here, I can't get the result of this division:

aspectRatio = backingWidth / backingHeight;

I've thought I might try casting to (GLfloat) but that didn't do anything. As I step through the code I see that aspectRatio is 0 after the operation, while backingWidth is clearly 768 and backingHeight is 1029.

Here are the types:

GLfloat aspectRatio;

and

// The pixel dimensions of the CAEAGLLayer
GLint backingWidth;
GLint backingHeight;

It must be something basic I'm doing wrong here..