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Setting Breakpoints on OpenGL Functions

You set breakpoints in the Breakpoints window. To open this window, choose Views > Breakpoints. As shown in Figure 2-1, the left side of the window lists the OpenGL functions that you can set breakpoints on. This list includes functions defined by the OpenGL specification and the CGL calls available in Mac OS X. Keep in mind that AGL functions and Cocoa OpenGL class methods call into the CGL framework, so AGL and Cocoa methods aren’t explicitly on the function list.

The right side of the window lets you view the call stack, as shown in Figure 2-1, or OpenGL state variables, as shown in Figure 2-2.

To set a breakpoint, choose the OpenGL function in the function list that you want to set a breakpoint on. Then click one of the following columns:

• Before pauses your application just before it executes the OpenGL function.

• After pauses your application just after it executes the OpenGL function.

A blue indicator appears wherever you set a breakpoint.

The checkboxes below the function list let you set breakpoint conditions. You can also turn the function list breakpoints on and off quickly by selecting “Ignore all breakpoints.”

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