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rockbox/apps/plugins/xworld/vm.c
Franklin Wei 33cb13dee5 Xworld - Another World interpreter for Rockbox 
Co-conspirators: Franklin Wei, Benjamin Brown

--------------------------------------------------------------------
This work is based on:
- Fabien Sanglard's "Fabother World" based on
- Piotr Padkowski's newRaw interpreter which was based on
- Gregory Montoir's reverse engineering of
- Eric Chahi's assembly code

--------------------------------------------------------------------
Progress:

* The plugin runs pretty nicely (with sound!) on most color targets
* Keymaps for color LCD targets are complete
* The manual entry is finished
* Grayscale/monochrome support is NOT PLANNED
  - the game looks horrible in grayscale! :p

--------------------------------------------------------------------
Notes:

* The original game strings were built-in to the executable, and
  were copyrighted and could not be used.
* This port ships with an alternate set of strings by default, but
  can load the "official" strings from a file at runtime.

--------------------------------------------------------------------
To be done (in descending order of importance):

* vertical stride compatibility                          <30% done>
* optimization                                           <10% done>

Change-Id: I3155b0d97c2ac470cb8a2040f40d4139ddcebfa5
Reviewed-on: http://gerrit.rockbox.org/1077
Reviewed-by: Michael Giacomelli <giac2000@hotmail.com>
2014-12-23 23:48:12 +01:00

763 lines
24 KiB
C
Raw Blame History

/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2014 Franklin Wei, Benjamin Brown
* Copyright (C) 2004 Gregory Montoir
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
#include "plugin.h"
#include "vm.h"
#include "mixer.h"
#include "resource.h"
#include "video.h"
#include "serializer.h"
#include "sfxplayer.h"
#include "sys.h"
#include "parts.h"
#include "file.h"
static const uint16_t vm_frequenceTable[] = {
0x0CFF, 0x0DC3, 0x0E91, 0x0F6F, 0x1056, 0x114E, 0x1259, 0x136C,
0x149F, 0x15D9, 0x1726, 0x1888, 0x19FD, 0x1B86, 0x1D21, 0x1EDE,
0x20AB, 0x229C, 0x24B3, 0x26D7, 0x293F, 0x2BB2, 0x2E4C, 0x3110,
0x33FB, 0x370D, 0x3A43, 0x3DDF, 0x4157, 0x4538, 0x4998, 0x4DAE,
0x5240, 0x5764, 0x5C9A, 0x61C8, 0x6793, 0x6E19, 0x7485, 0x7BBD
};
void vm_create(struct VirtualMachine* m, struct Mixer *mix, struct Resource* res, struct SfxPlayer *ply, struct Video *vid, struct System *stub)
{
m->res = res;
m->video = vid;
m->sys = stub;
m->mixer = mix;
m->player = ply;
}
void vm_init(struct VirtualMachine* m) {
rb->memset(m->vmVariables, 0, sizeof(m->vmVariables));
m->vmVariables[0x54] = 0x81;
m->vmVariables[VM_VARIABLE_RANDOM_SEED] = *rb->current_tick;
m->_fastMode = false;
m->player->_markVar = &m->vmVariables[VM_VARIABLE_MUS_MARK];
}
void vm_op_movConst(struct VirtualMachine* m) {
uint8_t variableId = scriptPtr_fetchByte(&m->_scriptPtr);
int16_t value = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_movConst(0x%02X, %d)", variableId, value);
m->vmVariables[variableId] = value;
}
void vm_op_mov(struct VirtualMachine* m) {
uint8_t dstVariableId = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t srcVariableId = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_mov(0x%02X, 0x%02X)", dstVariableId, srcVariableId);
m->vmVariables[dstVariableId] = m->vmVariables[srcVariableId];
}
void vm_op_add(struct VirtualMachine* m) {
uint8_t dstVariableId = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t srcVariableId = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_add(0x%02X, 0x%02X)", dstVariableId, srcVariableId);
m->vmVariables[dstVariableId] += m->vmVariables[srcVariableId];
}
void vm_op_addConst(struct VirtualMachine* m) {
if (m->res->currentPartId == 0x3E86 && m->_scriptPtr.pc == m->res->segBytecode + 0x6D48) {
warning("vm_op_addConst() hack for non-stop looping gun sound bug");
// the script 0x27 slot 0x17 doesn't stop the gun sound from looping, I
// don't really know why ; for now, let's play the 'stopping sound' like
// the other scripts do
// (0x6D43) jmp(0x6CE5)
// (0x6D46) break
// (0x6D47) VAR(6) += -50
vm_snd_playSound(m, 0x5B, 1, 64, 1);
}
uint8_t variableId = scriptPtr_fetchByte(&m->_scriptPtr);
int16_t value = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_addConst(0x%02X, %d)", variableId, value);
m->vmVariables[variableId] += value;
}
void vm_op_call(struct VirtualMachine* m) {
uint16_t offset = scriptPtr_fetchWord(&m->_scriptPtr);
uint8_t sp = m->_stackPtr;
debug(DBG_VM, "vm_op_call(0x%X)", offset);
m->_scriptStackCalls[sp] = m->_scriptPtr.pc - m->res->segBytecode;
if (m->_stackPtr == 0xFF) {
error("vm_op_call() ec=0x%X stack overflow", 0x8F);
}
++m->_stackPtr;
m->_scriptPtr.pc = m->res->segBytecode + offset ;
}
void vm_op_ret(struct VirtualMachine* m) {
debug(DBG_VM, "vm_op_ret()");
if (m->_stackPtr == 0) {
error("vm_op_ret() ec=0x%X stack underflow", 0x8F);
}
--m->_stackPtr;
uint8_t sp = m->_stackPtr;
m->_scriptPtr.pc = m->res->segBytecode + m->_scriptStackCalls[sp];
}
void vm_op_pauseThread(struct VirtualMachine* m) {
debug(DBG_VM, "vm_op_pauseThread()");
m->gotoNextThread = true;
}
void vm_op_jmp(struct VirtualMachine* m) {
uint16_t pcOffset = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_jmp(0x%02X)", pcOffset);
m->_scriptPtr.pc = m->res->segBytecode + pcOffset;
}
void vm_op_setSetVect(struct VirtualMachine* m) {
uint8_t threadId = scriptPtr_fetchByte(&m->_scriptPtr);
uint16_t pcOffsetRequested = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_setSetVect(0x%X, 0x%X)", threadId, pcOffsetRequested);
m->threadsData[REQUESTED_PC_OFFSET][threadId] = pcOffsetRequested;
}
void vm_op_jnz(struct VirtualMachine* m) {
uint8_t i = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_jnz(0x%02X)", i);
--m->vmVariables[i];
if (m->vmVariables[i] != 0) {
vm_op_jmp(m);
} else {
scriptPtr_fetchWord(&m->_scriptPtr);
}
}
#define BYPASS_PROTECTION
void vm_op_condJmp(struct VirtualMachine* m) {
//printf("Jump : %X \n",m->_scriptPtr.pc-m->res->segBytecode);
//FCS Whoever wrote this is patching the bytecode on the fly. This is ballzy !!
#ifdef BYPASS_PROTECTION
if (m->res->currentPartId == GAME_PART_FIRST && m->_scriptPtr.pc == m->res->segBytecode + 0xCB9) {
// (0x0CB8) condJmp(0x80, VAR(41), VAR(30), 0xCD3)
*(m->_scriptPtr.pc + 0x00) = 0x81;
*(m->_scriptPtr.pc + 0x03) = 0x0D;
*(m->_scriptPtr.pc + 0x04) = 0x24;
// (0x0D4E) condJmp(0x4, VAR(50), 6, 0xDBC)
*(m->_scriptPtr.pc + 0x99) = 0x0D;
*(m->_scriptPtr.pc + 0x9A) = 0x5A;
debug(DBG_VM, "vm_op_condJmp() bypassing protection");
debug(DBG_VM, "bytecode has been patched");
//vm_bypassProtection(m);
}
#endif
uint8_t opcode = scriptPtr_fetchByte(&m->_scriptPtr);
int16_t b = m->vmVariables[scriptPtr_fetchByte(&m->_scriptPtr)];
uint8_t c = scriptPtr_fetchByte(&m->_scriptPtr);
int16_t a;
if (opcode & 0x80) {
a = m->vmVariables[c];
} else if (opcode & 0x40) {
a = c * 256 + scriptPtr_fetchByte(&m->_scriptPtr);
} else {
a = c;
}
debug(DBG_VM, "vm_op_condJmp(%d, 0x%02X, 0x%02X)", opcode, b, a);
// Check if the conditional value is met.
bool expr = false;
switch (opcode & 7) {
case 0: // jz
expr = (b == a);
break;
case 1: // jnz
expr = (b != a);
break;
case 2: // jg
expr = (b > a);
break;
case 3: // jge
expr = (b >= a);
break;
case 4: // jl
expr = (b < a);
break;
case 5: // jle
expr = (b <= a);
break;
default:
warning("vm_op_condJmp() invalid condition %d", (opcode & 7));
break;
}
if (expr) {
vm_op_jmp(m);
} else {
scriptPtr_fetchWord(&m->_scriptPtr);
}
}
void vm_op_setPalette(struct VirtualMachine* m) {
uint16_t paletteId = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_changePalette(%d)", paletteId);
m->video->paletteIdRequested = paletteId >> 8;
}
void vm_op_resetThread(struct VirtualMachine* m) {
uint8_t threadId = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t i = scriptPtr_fetchByte(&m->_scriptPtr);
// FCS: WTF, this is cryptic as hell !!
// int8_t n = (i & 0x3F) - threadId; //0x3F = 0011 1111
// The following is so much clearer
//Make sure i is within [0-VM_NUM_THREADS-1]
i = i & (VM_NUM_THREADS - 1) ;
int8_t n = i - threadId;
if (n < 0) {
warning("vm_op_m->resetThread() ec=0x%X (n < 0)", 0x880);
return;
}
++n;
uint8_t a = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_m->resetThread(%d, %d, %d)", threadId, i, a);
if (a == 2) {
uint16_t *p = &m->threadsData[REQUESTED_PC_OFFSET][threadId];
while (n--) {
*p++ = 0xFFFE;
}
} else if (a < 2) {
uint8_t *p = &m->vmIsChannelActive[REQUESTED_STATE][threadId];
while (n--) {
*p++ = a;
}
}
}
void vm_op_selectVideoPage(struct VirtualMachine* m) {
uint8_t frameBufferId = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_selectVideoPage(%d)", frameBufferId);
video_changePagePtr1(m->video, frameBufferId);
}
void vm_op_fillVideoPage(struct VirtualMachine* m) {
uint8_t pageId = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t color = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_fillVideoPage(%d, %d)", pageId, color);
video_fillPage(m->video, pageId, color);
}
void vm_op_copyVideoPage(struct VirtualMachine* m) {
uint8_t srcPageId = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t dstPageId = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_copyVideoPage(%d, %d)", srcPageId, dstPageId);
video_copyPage(m->video, srcPageId, dstPageId, m->vmVariables[VM_VARIABLE_SCROLL_Y]);
}
static uint32_t lastTimeStamp = 0;
void vm_op_blitFramebuffer(struct VirtualMachine* m) {
uint8_t pageId = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_blitFramebuffer(%d)", pageId);
vm_inp_handleSpecialKeys(m);
/* Nasty hack....was this present in the original assembly ??!! */
if (m->res->currentPartId == GAME_PART_FIRST && m->vmVariables[0x67] == 1)
m->vmVariables[0xDC] = 0x21;
if (!m->_fastMode) {
int32_t delay = sys_getTimeStamp(m->sys) - lastTimeStamp;
int32_t timeToSleep = m->vmVariables[VM_VARIABLE_PAUSE_SLICES] * 20 - delay;
/* The bytecode will set m->vmVariables[VM_VARIABLE_PAUSE_SLICES] from 1 to 5 */
/* The virtual machine hence indicates how long the image should be displayed. */
if (timeToSleep > 0)
{
sys_sleep(m->sys, timeToSleep);
}
lastTimeStamp = sys_getTimeStamp(m->sys);
}
/* WTF ? */
m->vmVariables[0xF7] = 0;
video_updateDisplay(m->video, pageId);
}
void vm_op_killThread(struct VirtualMachine* m) {
debug(DBG_VM, "vm_op_killThread()");
m->_scriptPtr.pc = m->res->segBytecode + 0xFFFF;
m->gotoNextThread = true;
}
void vm_op_drawString(struct VirtualMachine* m) {
uint16_t stringId = scriptPtr_fetchWord(&m->_scriptPtr);
uint16_t x = scriptPtr_fetchByte(&m->_scriptPtr);
uint16_t y = scriptPtr_fetchByte(&m->_scriptPtr);
uint16_t color = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_drawString(0x%03X, %d, %d, %d)", stringId, x, y, color);
video_drawString(m->video, color, x, y, stringId);
}
void vm_op_sub(struct VirtualMachine* m) {
uint8_t i = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t j = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_sub(0x%02X, 0x%02X)", i, j);
m->vmVariables[i] -= m->vmVariables[j];
}
void vm_op_and(struct VirtualMachine* m) {
uint8_t variableId = scriptPtr_fetchByte(&m->_scriptPtr);
uint16_t n = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_and(0x%02X, %d)", variableId, n);
m->vmVariables[variableId] = (uint16_t)m->vmVariables[variableId] & n;
}
void vm_op_or(struct VirtualMachine* m) {
uint8_t variableId = scriptPtr_fetchByte(&m->_scriptPtr);
uint16_t value = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_or(0x%02X, %d)", variableId, value);
m->vmVariables[variableId] = (uint16_t)m->vmVariables[variableId] | value;
}
void vm_op_shl(struct VirtualMachine* m) {
uint8_t variableId = scriptPtr_fetchByte(&m->_scriptPtr);
uint16_t leftShiftValue = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_shl(0x%02X, %d)", variableId, leftShiftValue);
m->vmVariables[variableId] = (uint16_t)m->vmVariables[variableId] << leftShiftValue;
}
void vm_op_shr(struct VirtualMachine* m) {
uint8_t variableId = scriptPtr_fetchByte(&m->_scriptPtr);
uint16_t rightShiftValue = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_shr(0x%02X, %d)", variableId, rightShiftValue);
m->vmVariables[variableId] = (uint16_t)m->vmVariables[variableId] >> rightShiftValue;
}
void vm_op_playSound(struct VirtualMachine* m) {
uint16_t resourceId = scriptPtr_fetchWord(&m->_scriptPtr);
uint8_t freq = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t vol = scriptPtr_fetchByte(&m->_scriptPtr);
uint8_t channel = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_playSound(0x%X, %d, %d, %d)", resourceId, freq, vol, channel);
vm_snd_playSound(m, resourceId, freq, vol, channel);
}
void vm_op_updateMemList(struct VirtualMachine* m) {
uint16_t resourceId = scriptPtr_fetchWord(&m->_scriptPtr);
debug(DBG_VM, "vm_op_updateMemList(%d)", resourceId);
if (resourceId == 0) {
player_stop(m->player);
mixer_stopAll(m->mixer);
res_invalidateRes(m->res);
} else {
res_loadPartsOrMemoryEntry(m->res, resourceId);
}
}
void vm_op_playMusic(struct VirtualMachine* m) {
uint16_t resNum = scriptPtr_fetchWord(&m->_scriptPtr);
uint16_t delay = scriptPtr_fetchWord(&m->_scriptPtr);
uint8_t pos = scriptPtr_fetchByte(&m->_scriptPtr);
debug(DBG_VM, "vm_op_playMusic(0x%X, %d, %d)", resNum, delay, pos);
vm_snd_playMusic(m, resNum, delay, pos);
}
void vm_initForPart(struct VirtualMachine* m, uint16_t partId) {
player_stop(m->player);
mixer_stopAll(m->mixer);
/* WTF is that ? */
m->vmVariables[0xE4] = 0x14;
res_setupPart(m->res, partId);
/* Set all thread to inactive (pc at 0xFFFF or 0xFFFE ) */
rb->memset((uint8_t *)m->threadsData, 0xFF, sizeof(m->threadsData));
rb->memset((uint8_t *)m->vmIsChannelActive, 0, sizeof(m->vmIsChannelActive));
int firstThreadId = 0;
m->threadsData[PC_OFFSET][firstThreadId] = 0;
}
/*
This is called every frames in the infinite loop.
*/
void vm_checkThreadRequests(struct VirtualMachine* m) {
/* Check if a part switch has been requested. */
if (m->res->requestedNextPart != 0) {
vm_initForPart(m, m->res->requestedNextPart);
m->res->requestedNextPart = 0;
}
/* Check if a state update has been requested for any thread during the previous VM execution: */
/* - Pause */
/* - Jump */
/* JUMP: */
/* Note: If a jump has been requested, the jump destination is stored */
/* in m->threadsData[REQUESTED_PC_OFFSET]. Otherwise m->threadsData[REQUESTED_PC_OFFSET] == 0xFFFF */
/* PAUSE: */
/* Note: If a pause has been requested it is stored in m->vmIsChannelActive[REQUESTED_STATE][i] */
for (int threadId = 0; threadId < VM_NUM_THREADS; threadId++) {
m->vmIsChannelActive[CURR_STATE][threadId] = m->vmIsChannelActive[REQUESTED_STATE][threadId];
uint16_t n = m->threadsData[REQUESTED_PC_OFFSET][threadId];
if (n != VM_NO_SETVEC_REQUESTED) {
m->threadsData[PC_OFFSET][threadId] = (n == 0xFFFE) ? VM_INACTIVE_THREAD : n;
m->threadsData[REQUESTED_PC_OFFSET][threadId] = VM_NO_SETVEC_REQUESTED;
}
}
}
void vm_hostFrame(struct VirtualMachine* m) {
/* Run the Virtual Machine for every active threads (one vm frame). */
/* Inactive threads are marked with a thread instruction pointer set to 0xFFFF (VM_INACTIVE_THREAD). */
/* A thread must feature a break opcode so the interpreter can move to the next thread. */
for (int threadId = 0; threadId < VM_NUM_THREADS; threadId++) {
if (m->vmIsChannelActive[CURR_STATE][threadId])
continue;
uint16_t n = m->threadsData[PC_OFFSET][threadId];
if (n != VM_INACTIVE_THREAD) {
/* Set the script pointer to the right location. */
/* script pc is used in executeThread in order */
/* to get the next opcode. */
m->_scriptPtr.pc = m->res->segBytecode + n;
m->_stackPtr = 0;
m->gotoNextThread = false;
debug(DBG_VM, "vm_hostFrame() i=0x%02X n=0x%02X *p=0x%02X", threadId, n, *m->_scriptPtr.pc);
vm_executeThread(m);
/* Since .pc is going to be modified by this next loop iteration, we need to save it. */
m->threadsData[PC_OFFSET][threadId] = m->_scriptPtr.pc - m->res->segBytecode;
debug(DBG_VM, "vm_hostFrame() i=0x%02X pos=0x%X", threadId, m->threadsData[PC_OFFSET][threadId]);
if (m->sys->input.quit) {
break;
}
}
}
}
#define COLOR_BLACK 0xFF
#define DEFAULT_ZOOM 0x40
void vm_executeThread(struct VirtualMachine* m) {
while (!m->gotoNextThread) {
uint8_t opcode = scriptPtr_fetchByte(&m->_scriptPtr);
/* 1000 0000 is set */
if (opcode & 0x80)
{
uint16_t off = ((opcode << 8) | scriptPtr_fetchByte(&m->_scriptPtr)) * 2;
m->res->_useSegVideo2 = false;
int16_t x = scriptPtr_fetchByte(&m->_scriptPtr);
int16_t y = scriptPtr_fetchByte(&m->_scriptPtr);
int16_t h = y - 199;
if (h > 0) {
y = 199;
x += h;
}
debug(DBG_VIDEO, "vid_opcd_0x80 : opcode=0x%X off=0x%X x=%d y=%d", opcode, off, x, y);
/* This switch the polygon database to "cinematic" and probably draws a black polygon */
/* over all the screen. */
video_setDataBuffer(m->video, m->res->segCinematic, off);
struct Point temp;
temp.x = x;
temp.y = y;
video_readAndDrawPolygon(m->video, COLOR_BLACK, DEFAULT_ZOOM, &temp);
continue;
}
/* 0100 0000 is set */
if (opcode & 0x40)
{
int16_t x, y;
uint16_t off = scriptPtr_fetchWord(&m->_scriptPtr) * 2;
x = scriptPtr_fetchByte(&m->_scriptPtr);
m->res->_useSegVideo2 = false;
if (!(opcode & 0x20))
{
if (!(opcode & 0x10)) /* 0001 0000 is set */
{
x = (x << 8) | scriptPtr_fetchByte(&m->_scriptPtr);
} else {
x = m->vmVariables[x];
}
}
else
{
if (opcode & 0x10) { /* 0001 0000 is set */
x += 0x100;
}
}
y = scriptPtr_fetchByte(&m->_scriptPtr);
if (!(opcode & 8)) /* 0000 1000 is set */
{
if (!(opcode & 4)) { /* 0000 0100 is set */
y = (y << 8) | scriptPtr_fetchByte(&m->_scriptPtr);
} else {
y = m->vmVariables[y];
}
}
uint16_t zoom = scriptPtr_fetchByte(&m->_scriptPtr);
if (!(opcode & 2)) /* 0000 0010 is set */
{
if (!(opcode & 1)) /* 0000 0001 is set */
{
--m->_scriptPtr.pc;
zoom = 0x40;
}
else
{
zoom = m->vmVariables[zoom];
}
}
else
{
if (opcode & 1) { /* 0000 0001 is set */
m->res->_useSegVideo2 = true;
--m->_scriptPtr.pc;
zoom = 0x40;
}
}
debug(DBG_VIDEO, "vid_opcd_0x40 : off=0x%X x=%d y=%d", off, x, y);
video_setDataBuffer(m->video, m->res->_useSegVideo2 ? m->res->_segVideo2 : m->res->segCinematic, off);
struct Point temp;
temp.x = x;
temp.y = y;
video_readAndDrawPolygon(m->video, 0xFF, zoom, &temp);
continue;
}
if (opcode > 0x1A)
{
error("vm_executeThread() ec=0x%X invalid opcode=0x%X", 0xFFF, opcode);
}
else
{
(vm_opcodeTable[opcode])(m);
}
rb->yield();
}
}
void vm_inp_updatePlayer(struct VirtualMachine* m) {
sys_processEvents(m->sys);
if (m->res->currentPartId == 0x3E89) {
char c = m->sys->input.lastChar;
if (c == 8 || /*c == 0xD |*/ c == 0 || (c >= 'a' && c <= 'z')) {
m->vmVariables[VM_VARIABLE_LAST_KEYCHAR] = c & ~0x20;
m->sys->input.lastChar = 0;
}
}
int16_t lr = 0;
int16_t mask = 0;
int16_t ud = 0;
if (m->sys->input.dirMask & DIR_RIGHT) {
lr = 1;
mask |= 1;
}
if (m->sys->input.dirMask & DIR_LEFT) {
lr = -1;
mask |= 2;
}
if (m->sys->input.dirMask & DIR_DOWN) {
ud = 1;
mask |= 4;
}
m->vmVariables[VM_VARIABLE_HERO_POS_UP_DOWN] = ud;
if (m->sys->input.dirMask & DIR_UP) {
m->vmVariables[VM_VARIABLE_HERO_POS_UP_DOWN] = -1;
}
if (m->sys->input.dirMask & DIR_UP) { /* inpJump */
ud = -1;
mask |= 8;
}
m->vmVariables[VM_VARIABLE_HERO_POS_JUMP_DOWN] = ud;
m->vmVariables[VM_VARIABLE_HERO_POS_LEFT_RIGHT] = lr;
m->vmVariables[VM_VARIABLE_HERO_POS_MASK] = mask;
int16_t button = 0;
if (m->sys->input.button) {
button = 1;
mask |= 0x80;
}
m->vmVariables[VM_VARIABLE_HERO_ACTION] = button;
m->vmVariables[VM_VARIABLE_HERO_ACTION_POS_MASK] = mask;
}
void vm_inp_handleSpecialKeys(struct VirtualMachine* m) {
if (m->sys->input.pause) {
if (m->res->currentPartId != GAME_PART1 && m->res->currentPartId != GAME_PART2) {
m->sys->input.pause = false;
while (!m->sys->input.pause) {
sys_processEvents(m->sys);
sys_sleep(m->sys, 200);
}
}
m->sys->input.pause = false;
}
if (m->sys->input.code) {
m->sys->input.code = false;
if (m->res->currentPartId != GAME_PART_LAST && m->res->currentPartId != GAME_PART_FIRST) {
m->res->requestedNextPart = GAME_PART_LAST;
}
}
/* User has inputted a bad code, the "ERROR" screen is showing */
if (m->vmVariables[0xC9] == 1) {
debug(DBG_VM, "vm_inp_handleSpecialKeys() unhandled case (m->vmVariables[0xC9] == 1)");
}
}
void vm_snd_playSound(struct VirtualMachine* m, uint16_t resNum, uint8_t freq, uint8_t vol, uint8_t channel) {
debug(DBG_SND, "snd_playSound(0x%X, %d, %d, %d)", resNum, freq, vol, channel);
struct MemEntry *me = &m->res->_memList[resNum];
if (me->state != MEMENTRY_STATE_LOADED)
return;
if (vol == 0) {
mixer_stopChannel(m->mixer, channel);
} else {
struct MixerChunk mc;
rb->memset(&mc, 0, sizeof(mc));
mc.data = me->bufPtr + 8; /* skip header */
mc.len = READ_BE_UINT16(me->bufPtr) * 2;
mc.loopLen = READ_BE_UINT16(me->bufPtr + 2) * 2;
if (mc.loopLen != 0) {
mc.loopPos = mc.len;
}
assert(freq < 40);
mixer_playChannel(m->mixer, channel & 3, &mc, vm_frequenceTable[freq], MIN(vol, 0x3F));
}
}
void vm_snd_playMusic(struct VirtualMachine* m, uint16_t resNum, uint16_t delay, uint8_t pos) {
debug(DBG_SND, "snd_playMusic(0x%X, %d, %d)", resNum, delay, pos);
if (resNum != 0) {
player_loadSfxModule(m->player, resNum, delay, pos);
player_start(m->player);
} else if (delay != 0) {
player_setEventsDelay(m->player, delay);
} else {
player_stop(m->player);
}
}
void vm_saveOrLoad(struct VirtualMachine* m, struct Serializer *ser) {
struct Entry entries[] = {
SE_ARRAY(m->vmVariables, 0x100, SES_INT16, VER(1)),
SE_ARRAY(m->_scriptStackCalls, 0x100, SES_INT16, VER(1)),
SE_ARRAY(m->threadsData, 0x40 * 2, SES_INT16, VER(1)),
SE_ARRAY(m->vmIsChannelActive, 0x40 * 2, SES_INT8, VER(1)),
SE_END()
};
ser_saveOrLoadEntries(ser, entries);
}
void vm_bypassProtection(struct VirtualMachine* m)
{
File f;
file_create(&f, true);
if (!file_open(&f, "bank0e", res_getDataDir(m->res), "rb")) {
warning("Unable to bypass protection: add bank0e file to datadir");
} else {
struct Serializer s;
ser_create(&s, &f, SM_LOAD, m->res->_memPtrStart, 2);
vm_saveOrLoad(m, &s);
res_saveOrLoad(m->res, &s);
video_saveOrLoad(m->video, &s);
player_saveOrLoad(m->player, &s);
mixer_saveOrLoad(m->mixer, &s);
}
file_close(&f);
}
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