While working on the Rhipmunk FFI, I ran into a definition called "NOT_GRABABLE_MASK", which as far as I can tell, is defined as: #define GRABABLE_MASK (1<<31) #define NOT_GRABABLE_MASK (~GRABABLE_MASK)
The problem with this, is that when I do the same operations: (define GRABABLE_MASK (int->uint (arithmetic-shift 1 31))) (define NOT_GRABABLE_MASK (bitwise-not GRABABLE_MASK)) I get an error thrown back at me when I use it in one of the Chipmunk functions: Scheme->C: expects argument of type <uint32>; given -2147483649 How can I coerce the definitions of those two masks so that they will be a uint32 that I can pass to the Chipmunk API?
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