[Scummvm-cvs-logs] SF.net SVN: scummvm:[47684] scummvm/trunk/engines/sci/engine/vm.cpp
lskovlun at users.sourceforge.net
lskovlun at users.sourceforge.net
Fri Jan 29 23:29:04 CET 2010
Revision: 47684
http://scummvm.svn.sourceforge.net/scummvm/?rev=47684&view=rev
Author: lskovlun
Date: 2010-01-29 22:29:03 +0000 (Fri, 29 Jan 2010)
Log Message:
-----------
Document my last change
Modified Paths:
--------------
scummvm/trunk/engines/sci/engine/vm.cpp
Modified: scummvm/trunk/engines/sci/engine/vm.cpp
===================================================================
--- scummvm/trunk/engines/sci/engine/vm.cpp 2010-01-29 22:17:27 UTC (rev 47683)
+++ scummvm/trunk/engines/sci/engine/vm.cpp 2010-01-29 22:29:03 UTC (rev 47684)
@@ -896,6 +896,17 @@
case op_uge_: // 0x14 (20)
s->r_prev = s->r_acc;
r_temp = POP32();
+
+ // SCI0/SCI1 scripts use this to check whether a
+ // parameter is a pointer or a far text
+ // reference. It is used e.g. by the standard library
+ // Print function to distinguish two ways of calling it:
+ //
+ // (Print "foo") // Pointer to a string
+ // (Print 420 5) // Reference to the fifth message in text resource 420
+
+ // It works because in those games, the maximum resource number is 999,
+ // so any parameter value above that threshold must be a pointer.
if (s->r_acc == make_reg(0, 0x3e8))
s->r_acc = make_reg(0, r_temp.segment);
else if (r_temp.segment && s->r_acc.segment)
@@ -907,6 +918,8 @@
case op_ult_: // 0x15 (21)
s->r_prev = s->r_acc;
r_temp = POP32();
+
+ // See above
if (s->r_acc == make_reg(0, 0x3e8))
s->r_acc = make_reg(0, !r_temp.segment);
else if (r_temp.segment && s->r_acc.segment)
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