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Elite on the BBC Micro

Maths (Geometry): FAROF2 [Master version]

Name: FAROF2 [Show more] Type: Subroutine Category: Maths (Geometry) Summary: Compare x_hi, y_hi and z_hi with A
Context: See this subroutine in context in the source code Variations: See code variations for this subroutine in the different versions References: This subroutine is called as follows: * Main flight loop (Part 14 of 16) calls FAROF2

Compare x_hi, y_hi and z_hi with A, and set the C flag if all three <= A, otherwise clear the C flag. Returns: C flag Set if x_hi <= A and y_hi <= A and z_hi <= A Clear otherwise (i.e. if any one of them are bigger than A)
.FAROF2 CMP INWK+1 \ If A < x_hi, C will be clear so jump to FA1 to BCC FA1 \ return from the subroutine with C clear, otherwise \ C will be set so move on to the next one CMP INWK+4 \ If A < y_hi, C will be clear so jump to FA1 to BCC FA1 \ return from the subroutine with C clear, otherwise \ C will be set so move on to the next one CMP INWK+7 \ If A < z_hi, C will be clear, otherwise C will be set .FA1 RTS \ Return from the subroutine