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/* ScummVM - Kyrandia Interpreter
* Copyright (C) 2003-2005 The ScummVM project
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* $Header$
*
*/
#ifndef VM_H
#define VM_H
namespace Kyra {
// TODO:
// find out more script functions
enum ScriptFunc {
kSetupScene = 0,
kClickEvent = 1, // _registers[1] and _registers[2] are mouse x, y _registers[4] is action
kActorEvent = 2,
kEnterEvent = 4,
kExitEvent = 5,
kLoadResources = 7
};
enum ScriptState {
kScriptStopped = 0,
kScriptRunning = 1,
kScriptWaiting = 2,
kScriptError = 3
};
class VMContext {
public:
VMContext(KyraEngine* engine);
~VMContext() { delete [] _scriptFile; }
void loadScript(const char* file);
const char* stringAtIndex(int32 index);
// TODO: check for 'over'flow
void pushStack(int32 value) { _stack[_stackPos++] = value; }
void registerValue(int32 reg, int32 value) { _registers[reg] = value; }
int32 checkReg(int32 reg) { return _registers[reg]; }
uint32 state(void) { return _scriptState; }
bool startScript(int32 func);
uint32 contScript(void);
protected:
KyraEngine* _engine;
uint8* _scriptFile;
uint32 _scriptFileSize;
uint32 _scriptState;
uint32 _delay;
int32 _registers[32]; // registers of the interpreter
int32 _stack[64]; // our stack
// TODO: check for 'under'flow
int32 popStack(void) { return _stack[--_stackPos]; }
int32& topStack(void) { return _stack[_stackPos]; }
uint32 _returnValue;
int32 _nextScriptPos;
int32 _instructionPos;
int32 _stackPos;
int32 _tempPos;
// used by command & opcode procs
uint16 _argument;
uint8 _currentCommand;
uint32 _currentOpcode;
int32 param(int32 index);
const char* paramString(int32 index) { return stringAtIndex(param(index)); }
bool _error; // used by all command- and opcodefuncs
enum ScriptChunkTypes {
kForm = 0,
kEmc2Ordr = 1,
kText = 2,
kData = 3,
kCountChunkTypes
};
struct ScriptChunk {
uint32 _size;
uint8* _data; // by TEXT used for count of texts, by EMC2ODRD it is used for a count of somewhat
uint8* _additional; // currently only used for TEXT
};
ScriptChunk _chunks[kCountChunkTypes];
typedef void (VMContext::*CommandProc)();
struct CommandEntry {
CommandProc proc;
const char* desc;
};
typedef void (VMContext::*OpcodeProc)();
struct OpcodeEntry {
OpcodeProc proc;
const char* desc;
};
uint16 _numCommands;
const CommandEntry* _commands;
uint16 _numOpcodes;
const OpcodeEntry* _opcodes;
protected:
// the command procs
void c1_goToLine(void); // 0x00
void c1_setReturn(void); // 0x01
void c1_pushRetRec(void); // 0x02
void c1_push(void); // 0x03 & 0x04
void c1_pushVar(void); // 0x05
void c1_pushFrameNeg(void); // 0x06
void c1_pushFramePos(void); // 0x07
void c1_popRetRec(void); // 0x08
void c1_popVar(void); // 0x09
void c1_popFrameNeg(void); // 0x0A
void c1_popFramePos(void); // 0x0B
void c1_addToSP(void); // 0x0C
void c1_subFromSP(void); // 0x0D
void c1_execOpcode(void); // 0x0E
void c1_ifNotGoTo(void); // 0x0F
void c1_negate(void); // 0x10
void c1_evaluate(void); // 0x11
void c1_unknownCommand(void);
// the opcode procs
void o1_0x68(void); // 0x68
void o1_unknownOpcode(void);
};
} // end of namespace Kyra
#endif
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