quaternion conjugate support (engine side)

include/QF/pr_comp.h

@@ -294,6 +294,7 @@ typedef enum {
 	OP_MUL_Q,
 	OP_MUL_QF,
 	OP_MUL_FQ,
+	OP_CONJ_Q,
 	OP_NOT_Q,
 	OP_EQ_Q,
 	OP_NE_Q,

libs/gamecode/engine/pr_exec.c

@@ -347,6 +347,9 @@ PR_ExecuteProgram (progs_t * pr, func_t fnum)
 			case OP_MUL_QF:
 				QuatScale (OPA.quat_var, OPB.float_var, OPC.quat_var);
 				break;
+			case OP_CONJ_Q:
+				QuatConj (OPA.quat_var, OPC.quat_var);
+				break;
 			case OP_DIV_F:
 				OPC.float_var = OPA.float_var / OPB.float_var;
 				break;

libs/gamecode/engine/pr_opcode.c

@@ -134,6 +134,11 @@ opcode_t pr_opcodes[] = {
 	 PROG_ID_VERSION,
 	},
 
+	{"~", "conj.q", OP_CONJ_Q, false,
+	 ev_quat, ev_void, ev_quat,
+	 PROG_ID_VERSION,
+	},
+
 	{"/", "div.f", OP_DIV_F, false,
 	 ev_float, ev_float, ev_float,
 	 PROG_ID_VERSION,