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Fix for bug #2669415 (FW: half walking speed in a screen).

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svn-id: r42439
This commit is contained in:
Kari Salminen 2009-07-13 16:52:09 +00:00
parent 4ea74d7e04
commit e5c2275e80
1 changed files with 32 additions and 0 deletions
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32
engines/cine/script_fw.cpp
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@ -1443,6 +1443,38 @@ int FWScript::o1_palRotate() {
int FWScript::o1_break() {
debugC(5, kCineDebugScript, "Line: %d: break", _line);
// WORKAROUND for bug #2669415 ("FW: half walking speed in a screen").
// The problem was that in Amiga/Atari ST versions of Future Wars the
// walking speed has halved in a forest scene where a monk's robe hangs
// on a tree branch (Up and to the left from the medieval castle's front).
//
// Initialization script for the scene is PART02.PRC's 26th script (011_INIT)
// and the background used in the scene is L11.PI1. The difference between
// the PC version and the Amiga/Atari ST version of the script is that the
// PC version calls scripts 37 and 36 for handling movement of the character
// when Amiga/Atari ST version calls scripts 22 and 21 for the same purpose
// (Scripts 37 and 22 handle vertical movement, 36 and 21 the horizontal).
//
// The called scripts only differ functionally so that all BREAK opcodes have been
// doubled in the Amiga/Atari ST versions (i.e. one BREAK has become two BREAKs)
// and in script 21 after LABEL_25 there's an extra opcode that isn't in script 36:
// SET globalvars[251], 0.
//
// As a BREAK opcode stops the execution of a script it causes a pause and
// with the BREAKs doubled the pause is twice as long in the Amiga/Atari ST versions.
// Thus the longer pause is eliminated by running only one BREAK when several
// are designated (i.e. ignoring a BREAK if there's another BREAK after it).
//
// TODO: Check whether the speed is halved in any other scenes in Amiga/Atari ST versions under ScummVM
// TODO: Check whether the speed is halved when running the original executable under an emulator
if (g_cine->getGameType() == Cine::GType_FW &&
(g_cine->getPlatform() == Common::kPlatformAmiga || g_cine->getPlatform() == Common::kPlatformAtariST) &&
_pos < _script._size && _script.getByte(_pos) == (0x4F + 1) && // Is the next opcode a BREAK too?
scumm_stricmp(currentPrcName, "PART02.PRC") == 0 &&
scumm_stricmp(renderer->getBgName(), "L11.PI1") == 0) {
return 0;
}
return 1;
}