mirror of
https://github.com/libretro/scummvm.git
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135 lines
3.6 KiB
C++
135 lines
3.6 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#ifndef KYRA_SCRIPT_H
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#define KYRA_SCRIPT_H
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#include "kyra/kyra.h"
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#include "kyra/util.h"
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#include "common/stream.h"
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namespace Kyra {
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struct ScriptData {
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byte *text;
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uint16 *data;
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uint16 *ordr;
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uint16 dataSize;
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const Common::Array<const Opcode*> *opcodes;
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};
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struct ScriptState {
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uint16 *ip;
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const ScriptData *dataPtr;
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int16 retValue;
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uint16 bp;
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uint16 sp;
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int16 regs[30]; // VM registers
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int16 stack[61]; // VM stack
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};
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#define stackPos(x) (script->stack[script->sp+x])
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#define stackPosString(x) ((const char*)&script->dataPtr->text[READ_BE_UINT16(&script->dataPtr->text[stackPos(x)<<1])])
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#define FORM_CHUNK 0x4D524F46
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#define TEXT_CHUNK 0x54584554
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#define DATA_CHUNK 0x41544144
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#define ORDR_CHUNK 0x5244524F
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#define AVTL_CHUNK 0x4C545641
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class ScriptFileParser {
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public:
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ScriptFileParser() : _stream(0), _startOffset(0), _endOffset(0) {}
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ScriptFileParser(const char *filename, Resource *res) : _stream(0), _startOffset(0), _endOffset(0) { setFile(filename, res); }
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~ScriptFileParser() { destroy(); }
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// 'script' must be allocated with new!
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void setFile(const char *filename, Resource *res);
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operator bool() const { return (_startOffset != _endOffset) && _stream; }
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uint32 getFORMBlockSize();
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uint32 getIFFBlockSize(const uint32 chunk);
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bool loadIFFBlock(const uint32 chunk, void *loadTo, uint32 ptrSize);
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private:
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void destroy();
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Common::SeekableReadStream *_stream;
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uint32 _startOffset;
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uint32 _endOffset;
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};
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class ScriptHelper {
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public:
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ScriptHelper(KyraEngine *vm);
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bool loadScript(const char *filename, ScriptData *data, const Common::Array<const Opcode*> *opcodes);
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void unloadScript(ScriptData *data);
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void initScript(ScriptState *scriptState, const ScriptData *data);
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bool startScript(ScriptState *script, int function);
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bool validScript(ScriptState *script);
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bool runScript(ScriptState *script);
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protected:
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KyraEngine *_vm;
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int16 _parameter;
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bool _continue;
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typedef void (ScriptHelper::*CommandProc)(ScriptState*);
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struct CommandEntry {
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CommandProc proc;
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const char *desc;
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};
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const CommandEntry *_commands;
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private:
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void cmd_jmpTo(ScriptState*);
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void cmd_setRetValue(ScriptState*);
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void cmd_pushRetOrPos(ScriptState*);
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void cmd_push(ScriptState*);
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void cmd_pushReg(ScriptState*);
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void cmd_pushBPNeg(ScriptState*);
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void cmd_pushBPAdd(ScriptState*);
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void cmd_popRetOrPos(ScriptState*);
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void cmd_popReg(ScriptState*);
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void cmd_popBPNeg(ScriptState*);
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void cmd_popBPAdd(ScriptState*);
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void cmd_addSP(ScriptState*);
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void cmd_subSP(ScriptState*);
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void cmd_execOpcode(ScriptState*);
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void cmd_ifNotJmp(ScriptState*);
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void cmd_negate(ScriptState*);
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void cmd_eval(ScriptState*);
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void cmd_setRetAndJmp(ScriptState*);
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};
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} // end of namespace Kyra
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#endif
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