Right Shift

Here's a function to pass a signed 32 bit integer along with a value indicating how far to shift the bits. This method is primarily needed to shift bits for negative integers, as the regular bit shift operators work just fine for positive values.

RightShift.lsl

<lsl> // right shift doesn't work well for signed integers. // we essentially perform the operation as if it was // an unsigned integer. integer rightShift(integer value, integer bits) {

   // positive numbers are fine
   if(value >= 0)
       return value >> bits;

   // remove bit sign
   value = value ^ 0x80000000;
   
   // move bits
   value = value >> bits;
   
   // inject signed bit to new location
   value = value | (integer)(llPow(2, 31 - bits));
   
   return value;

} default {

   state_entry()
   {

       // output should be 268435449
       llSay(DEBUG_CHANNEL, (string)rightShift(-99, 4));

       // before: 1111 1111 1111 1111 1111 1111 1001 1101
       // after:  0000 1111 1111 1111 1111 1111 1111 1001
   }

}</lsl>