mirror of
https://github.com/libretro/scummvm.git
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131 lines
3.3 KiB
C++
131 lines
3.3 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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namespace Kyra {
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struct ScriptState;
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struct Opcode {
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virtual ~Opcode() {}
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virtual operator bool() const = 0;
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virtual int operator()(ScriptState*) const = 0;
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};
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template<class T>
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struct OpcodeImpl : public Opcode {
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T *vm;
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typedef int (T::*Callback)(ScriptState*);
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Callback callback;
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OpcodeImpl(T *v, Callback c) : Opcode(), vm(v), callback(c) {}
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operator bool() const { return callback != 0; }
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int operator()(ScriptState *state) const {
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return (vm->*callback)(state);
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}
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};
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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 variables[30];
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int16 stack[61];
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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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uint32 getFORMBlockSize(const byte *&data) const;
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uint32 getIFFBlockSize(const byte *start, const byte *&data, uint32 maxSize, const uint32 chunk) const;
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bool loadIFFBlock(const byte *start, const byte *&data, uint32 maxSize, const uint32 chunk, void *loadTo, uint32 ptrSize) const;
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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 c1_jmpTo(ScriptState*);
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void c1_setRetValue(ScriptState*);
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void c1_pushRetOrPos(ScriptState*);
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void c1_push(ScriptState*);
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//void c1_push(); same as 03
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void c1_pushVar(ScriptState*);
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void c1_pushBPNeg(ScriptState*);
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void c1_pushBPAdd(ScriptState*);
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void c1_popRetOrPos(ScriptState*);
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void c1_popVar(ScriptState*);
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void c1_popBPNeg(ScriptState*);
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void c1_popBPAdd(ScriptState*);
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void c1_addSP(ScriptState*);
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void c1_subSP(ScriptState*);
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void c1_execOpcode(ScriptState*);
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void c1_ifNotJmp(ScriptState*);
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void c1_negate(ScriptState*);
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void c1_eval(ScriptState*);
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void c1_setRetAndJmp(ScriptState*);
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};
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} // end of namespace Kyra
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#endif
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