mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-21 01:08:25 +00:00
446 lines
10 KiB
C++
446 lines
10 KiB
C++
/* ScummVM - Graphic Adventure Engine
|
|
*
|
|
* ScummVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the COPYRIGHT
|
|
* file distributed with this source distribution.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
#include "kyra/script.h"
|
|
#include "kyra/kyra_v1.h"
|
|
#include "kyra/resource.h"
|
|
|
|
#include "common/endian.h"
|
|
|
|
namespace Kyra {
|
|
EMCInterpreter::EMCInterpreter(KyraEngine_v1 *vm) : _vm(vm), _scriptData(0), _filename(0) {
|
|
#define OPCODE(x) { &EMCInterpreter::x, #x }
|
|
static const OpcodeEntry opcodes[] = {
|
|
// 0x00
|
|
OPCODE(op_jmp),
|
|
OPCODE(op_setRetValue),
|
|
OPCODE(op_pushRetOrPos),
|
|
OPCODE(op_push),
|
|
// 0x04
|
|
OPCODE(op_push),
|
|
OPCODE(op_pushReg),
|
|
OPCODE(op_pushBPNeg),
|
|
OPCODE(op_pushBPAdd),
|
|
// 0x08
|
|
OPCODE(op_popRetOrPos),
|
|
OPCODE(op_popReg),
|
|
OPCODE(op_popBPNeg),
|
|
OPCODE(op_popBPAdd),
|
|
// 0x0C
|
|
OPCODE(op_addSP),
|
|
OPCODE(op_subSP),
|
|
OPCODE(op_sysCall),
|
|
OPCODE(op_ifNotJmp),
|
|
// 0x10
|
|
OPCODE(op_negate),
|
|
OPCODE(op_eval),
|
|
OPCODE(op_setRetAndJmp)
|
|
};
|
|
_opcodes = opcodes;
|
|
#undef OPCODE
|
|
}
|
|
|
|
bool EMCInterpreter::callback(Common::IFFChunk &chunk) {
|
|
switch (chunk._type) {
|
|
case MKTAG('T','E','X','T'):
|
|
_scriptData->text = new byte[chunk._size];
|
|
assert(_scriptData->text);
|
|
if (chunk._stream->read(_scriptData->text, chunk._size) != chunk._size)
|
|
error("Couldn't read TEXT chunk from file '%s'", _filename);
|
|
break;
|
|
|
|
case MKTAG('O','R','D','R'):
|
|
_scriptData->ordr = new uint16[chunk._size >> 1];
|
|
assert(_scriptData->ordr);
|
|
if (chunk._stream->read(_scriptData->ordr, chunk._size) != chunk._size)
|
|
error("Couldn't read ORDR chunk from file '%s'", _filename);
|
|
|
|
for (int i = (chunk._size >> 1) - 1; i >= 0; --i)
|
|
_scriptData->ordr[i] = READ_BE_UINT16(&_scriptData->ordr[i]);
|
|
break;
|
|
|
|
case MKTAG('D','A','T','A'):
|
|
_scriptData->data = new uint16[chunk._size >> 1];
|
|
assert(_scriptData->data);
|
|
if (chunk._stream->read(_scriptData->data, chunk._size) != chunk._size)
|
|
error("Couldn't read DATA chunk from file '%s'", _filename);
|
|
|
|
for (int i = (chunk._size >> 1) - 1; i >= 0; --i)
|
|
_scriptData->data[i] = READ_BE_UINT16(&_scriptData->data[i]);
|
|
break;
|
|
|
|
default:
|
|
warning("Unexpected chunk '%s' of size %d found in file '%s'", tag2str(chunk._type), chunk._size, _filename);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool EMCInterpreter::load(const char *filename, EMCData *scriptData, const Common::Array<const Opcode *> *opcodes) {
|
|
Common::SeekableReadStream *stream = _vm->resource()->createReadStream(filename);
|
|
if (!stream) {
|
|
error("Couldn't open script file '%s'", filename);
|
|
return false; // for compilers that don't support NORETURN
|
|
}
|
|
|
|
memset(scriptData, 0, sizeof(EMCData));
|
|
|
|
_scriptData = scriptData;
|
|
_filename = filename;
|
|
|
|
IFFParser iff(*stream);
|
|
Common::Functor1Mem< Common::IFFChunk &, bool, EMCInterpreter > c(this, &EMCInterpreter::callback);
|
|
iff.parse(c);
|
|
|
|
if (!_scriptData->ordr)
|
|
error("No ORDR chunk found in file: '%s'", filename);
|
|
|
|
if (!_scriptData->data)
|
|
error("No DATA chunk found in file: '%s'", filename);
|
|
|
|
if (stream->err())
|
|
error("Read error while parsing file '%s'", filename);
|
|
|
|
delete stream;
|
|
|
|
_scriptData->sysFuncs = opcodes;
|
|
|
|
Common::strlcpy(_scriptData->filename, filename, 13);
|
|
|
|
_scriptData = 0;
|
|
_filename = 0;
|
|
|
|
return true;
|
|
}
|
|
|
|
void EMCInterpreter::unload(EMCData *data) {
|
|
if (!data)
|
|
return;
|
|
|
|
delete[] data->text;
|
|
delete[] data->ordr;
|
|
delete[] data->data;
|
|
|
|
data->text = 0;
|
|
data->ordr = data->data = 0;
|
|
}
|
|
|
|
void EMCInterpreter::init(EMCState *scriptStat, const EMCData *data) {
|
|
scriptStat->dataPtr = data;
|
|
scriptStat->ip = 0;
|
|
scriptStat->stack[EMCState::kStackLastEntry] = 0;
|
|
scriptStat->bp = EMCState::kStackSize+1;
|
|
scriptStat->sp = EMCState::kStackLastEntry;
|
|
}
|
|
|
|
bool EMCInterpreter::start(EMCState *script, int function) {
|
|
if (!script->dataPtr)
|
|
return false;
|
|
|
|
uint16 functionOffset = script->dataPtr->ordr[function];
|
|
if (functionOffset == 0xFFFF)
|
|
return false;
|
|
|
|
if (_vm->game() == GI_KYRA1) {
|
|
if (_vm->gameFlags().platform == Common::kPlatformFMTowns || _vm->gameFlags().platform == Common::kPlatformPC98)
|
|
script->ip = &script->dataPtr->data[functionOffset+1];
|
|
else
|
|
script->ip = &script->dataPtr->data[functionOffset];
|
|
} else {
|
|
script->ip = &script->dataPtr->data[functionOffset+1];
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool EMCInterpreter::isValid(EMCState *script) {
|
|
if (!script->ip || !script->dataPtr || _vm->shouldQuit())
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
bool EMCInterpreter::run(EMCState *script) {
|
|
_parameter = 0;
|
|
|
|
if (!script->ip)
|
|
return false;
|
|
|
|
// Should be no Problem at all to cast to uint32 here, since that's the biggest ptrdiff the original
|
|
// would allow, of course that's not realistic to happen to be somewhere near the limit of uint32 anyway.
|
|
const uint32 instOffset = (uint32)((const byte *)script->ip - (const byte *)script->dataPtr->data);
|
|
int16 code = *script->ip++;
|
|
int16 opcode = (code >> 8) & 0x1F;
|
|
|
|
if (code & 0x8000) {
|
|
opcode = 0;
|
|
_parameter = code & 0x7FFF;
|
|
} else if (code & 0x4000) {
|
|
_parameter = (int8)(code);
|
|
} else if (code & 0x2000) {
|
|
_parameter = *script->ip++;
|
|
} else {
|
|
_parameter = 0;
|
|
}
|
|
|
|
if (opcode > 18) {
|
|
error("Unknown script opcode: %d in file '%s' at offset 0x%.08X", opcode, script->dataPtr->filename, instOffset);
|
|
} else {
|
|
debugC(5, kDebugLevelScript, "[0x%.08X] EMCInterpreter::%s([%d/%u])", instOffset, _opcodes[opcode].desc, _parameter, (uint)_parameter);
|
|
(this->*(_opcodes[opcode].proc))(script);
|
|
}
|
|
|
|
return (script->ip != 0);
|
|
}
|
|
|
|
#pragma mark -
|
|
#pragma mark - Command implementations
|
|
#pragma mark -
|
|
|
|
void EMCInterpreter::op_jmp(EMCState *script) {
|
|
script->ip = script->dataPtr->data + _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::op_setRetValue(EMCState *script) {
|
|
script->retValue = _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::op_pushRetOrPos(EMCState *script) {
|
|
switch (_parameter) {
|
|
case 0:
|
|
script->stack[--script->sp] = script->retValue;
|
|
break;
|
|
|
|
case 1:
|
|
script->stack[--script->sp] = script->ip - script->dataPtr->data + 1;
|
|
script->stack[--script->sp] = script->bp;
|
|
script->bp = script->sp + 2;
|
|
break;
|
|
|
|
default:
|
|
script->ip = 0;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::op_push(EMCState *script) {
|
|
script->stack[--script->sp] = _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::op_pushReg(EMCState *script) {
|
|
script->stack[--script->sp] = script->regs[_parameter];
|
|
}
|
|
|
|
void EMCInterpreter::op_pushBPNeg(EMCState *script) {
|
|
script->stack[--script->sp] = script->stack[(-(int32)(_parameter + 2)) + script->bp];
|
|
}
|
|
|
|
void EMCInterpreter::op_pushBPAdd(EMCState *script) {
|
|
script->stack[--script->sp] = script->stack[(_parameter - 1) + script->bp];
|
|
}
|
|
|
|
void EMCInterpreter::op_popRetOrPos(EMCState *script) {
|
|
switch (_parameter) {
|
|
case 0:
|
|
script->retValue = script->stack[script->sp++];
|
|
break;
|
|
|
|
case 1:
|
|
if (script->sp >= EMCState::kStackLastEntry) {
|
|
script->ip = 0;
|
|
} else {
|
|
script->bp = script->stack[script->sp++];
|
|
script->ip = script->dataPtr->data + script->stack[script->sp++];
|
|
}
|
|
break;
|
|
|
|
default:
|
|
script->ip = 0;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::op_popReg(EMCState *script) {
|
|
script->regs[_parameter] = script->stack[script->sp++];
|
|
}
|
|
|
|
void EMCInterpreter::op_popBPNeg(EMCState *script) {
|
|
script->stack[(-(int32)(_parameter + 2)) + script->bp] = script->stack[script->sp++];
|
|
}
|
|
|
|
void EMCInterpreter::op_popBPAdd(EMCState *script) {
|
|
script->stack[(_parameter - 1) + script->bp] = script->stack[script->sp++];
|
|
}
|
|
|
|
void EMCInterpreter::op_addSP(EMCState *script) {
|
|
script->sp += _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::op_subSP(EMCState *script) {
|
|
script->sp -= _parameter;
|
|
}
|
|
|
|
void EMCInterpreter::op_sysCall(EMCState *script) {
|
|
const uint8 id = _parameter;
|
|
|
|
assert(script->dataPtr->sysFuncs);
|
|
assert(id < script->dataPtr->sysFuncs->size());
|
|
|
|
if ((*script->dataPtr->sysFuncs)[id] && ((*script->dataPtr->sysFuncs)[id])->isValid()) {
|
|
script->retValue = (*(*script->dataPtr->sysFuncs)[id])(script);
|
|
} else {
|
|
script->retValue = 0;
|
|
warning("Unimplemented system call 0x%.02X/%d used in file '%s'", id, id, script->dataPtr->filename);
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::op_ifNotJmp(EMCState *script) {
|
|
if (!script->stack[script->sp++]) {
|
|
_parameter &= 0x7FFF;
|
|
script->ip = script->dataPtr->data + _parameter;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::op_negate(EMCState *script) {
|
|
int16 value = script->stack[script->sp];
|
|
switch (_parameter) {
|
|
case 0:
|
|
if (!value)
|
|
script->stack[script->sp] = 1;
|
|
else
|
|
script->stack[script->sp] = 0;
|
|
break;
|
|
|
|
case 1:
|
|
script->stack[script->sp] = -value;
|
|
break;
|
|
|
|
case 2:
|
|
script->stack[script->sp] = ~value;
|
|
break;
|
|
|
|
default:
|
|
warning("Unknown negation func: %d", _parameter);
|
|
script->ip = 0;
|
|
}
|
|
}
|
|
|
|
void EMCInterpreter::op_eval(EMCState *script) {
|
|
int16 ret = 0;
|
|
bool error = false;
|
|
|
|
int16 val1 = script->stack[script->sp++];
|
|
int16 val2 = script->stack[script->sp++];
|
|
|
|
switch (_parameter) {
|
|
case 0:
|
|
ret = (val2 && val1) ? 1 : 0;
|
|
break;
|
|
|
|
case 1:
|
|
ret = (val2 || val1) ? 1 : 0;
|
|
break;
|
|
|
|
case 2:
|
|
ret = (val1 == val2) ? 1 : 0;
|
|
break;
|
|
|
|
case 3:
|
|
ret = (val1 != val2) ? 1 : 0;
|
|
break;
|
|
|
|
case 4:
|
|
ret = (val1 > val2) ? 1 : 0;
|
|
break;
|
|
|
|
case 5:
|
|
ret = (val1 >= val2) ? 1 : 0;
|
|
break;
|
|
|
|
case 6:
|
|
ret = (val1 < val2) ? 1 : 0;
|
|
break;
|
|
|
|
case 7:
|
|
ret = (val1 <= val2) ? 1 : 0;
|
|
break;
|
|
|
|
case 8:
|
|
ret = val1 + val2;
|
|
break;
|
|
|
|
case 9:
|
|
ret = val2 - val1;
|
|
break;
|
|
|
|
case 10:
|
|
ret = val1 * val2;
|
|
break;
|
|
|
|
case 11:
|
|
ret = val2 / val1;
|
|
break;
|
|
|
|
case 12:
|
|
ret = val2 >> val1;
|
|
break;
|
|
|
|
case 13:
|
|
ret = val2 << val1;
|
|
break;
|
|
|
|
case 14:
|
|
ret = val1 & val2;
|
|
break;
|
|
|
|
case 15:
|
|
ret = val1 | val2;
|
|
break;
|
|
|
|
case 16:
|
|
ret = val2 % val1;
|
|
break;
|
|
|
|
case 17:
|
|
ret = val1 ^ val2;
|
|
break;
|
|
|
|
default:
|
|
warning("Unknown evaluate func: %d", _parameter);
|
|
error = true;
|
|
}
|
|
|
|
if (error)
|
|
script->ip = 0;
|
|
else
|
|
script->stack[--script->sp] = ret;
|
|
}
|
|
|
|
void EMCInterpreter::op_setRetAndJmp(EMCState *script) {
|
|
if (script->sp >= EMCState::kStackLastEntry) {
|
|
script->ip = 0;
|
|
} else {
|
|
script->retValue = script->stack[script->sp++];
|
|
uint16 temp = script->stack[script->sp++];
|
|
script->stack[EMCState::kStackLastEntry] = 0;
|
|
script->ip = &script->dataPtr->data[temp];
|
|
}
|
|
}
|
|
} // End of namespace Kyra
|