Add a button with a custom callback

Add a new group that may contain several sub-widgets

Add an arbitrary (optionally labeled) widget to the layout

Add a new top-level window

Actually do the allocation. Use the stack buffer if nobody has used it yet and the size requested fits. Otherwise, fall through to the standard alloca

Return the anchor height; this determines the vertical shift relative to the anchor position

Append a column of the given size (and stretch factor)

Set the push callback (for any type of button)

The callback to execute for this widget.

Set the change callback

Set the change callback

Set the change callback

Set the change callback (for toggle buttons)

Return the number of cols

Return a pointer to the cursor of the widget

Free: when trying to free the stack buffer, just mark it as free. For non-stack-buffer pointers, just fall though to the standard allocator.

Get the dot product of this vector with ano. \param o o vector to take dot product with. \return The dot product of the two vectors. */

Is this draggable?

Draw the window contents -- put your OpenGL draw calls here