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/* ScummVM - Scumm Interpreter
* Copyright (C) 2003 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.
*
* $Header$
*
*/
#include "grid.h"
#include "compact.h"
#define GRID_FILE_START 60000
int8 SkyGrid::_gridConvertTable[] = {
0, //0
1, //1
2, //2
3, //3
4, //4
5, //5
6, //6
7, //7
8, //8
9, //9
10, //10
11, //11
12, //12
13, //13
14, //14
15, //15
16, //16
17, //17
18, //18
19, //19
20, //20
21, //21
22, //22
23, //23
24, //24
25, //25
26, //26
27, //27
28, //28
29, //29
30, //30
31, //31
32, //32
33, //33
34, //34
-1, //35
35, //36
36, //37
37, //38
38, //39
39, //40
40, //41
41, //42
-1, //43
42, //44
43, //45
44, //46
45, //47
46, //48
-1, //49
-1, //50
-1, //51
-1, //52
-1, //53
-1, //54
-1, //55
-1, //56
-1, //57
-1, //58
-1, //59
-1, //60
-1, //61
-1, //62
-1, //63
-1, //64
47, //65
TOT_NO_GRIDS, //66
48, //67
49, //68
50, //69
51, //70
52, //71
53, //72
54, //73
55, //74
56, //75
57, //76
58, //77
59, //78
60, //79
-1, //80
61, //81
62, //82
-1, //83
-1, //84
-1, //85
-1, //86
-1, //87
-1, //88
TOT_NO_GRIDS, //89
63, //90
64, //91
65, //92
66, //93
67, //94
68, //95
69, //96
};
SkyGrid::SkyGrid(SkyDisk *pDisk) {
_gameGrids = (uint8 *)malloc(TOT_NO_GRIDS * GRID_SIZE);
_skyDisk = pDisk;
}
SkyGrid::~SkyGrid(void) {
free(_gameGrids);
}
void SkyGrid::loadGrids(void) {
// no endian conversion necessary as I'm using uint8* instead of uint32*
for (uint8 cnt = 0; cnt < TOT_NO_GRIDS; cnt++)
_skyDisk->loadFile(GRID_FILE_START + cnt, _gameGrids + (cnt * GRID_SIZE));
if (!SkyState::isDemo()) { // single disk demos never get that far
// Reloading the grids can sometimes cause problems eg when reichs door is
// open the door grid bit gets replaced so you can't get back in (or out)
if (SkyLogic::_scriptVariables[REICH_DOOR_FLAG])
removeGrid(256, 280, 1, &SkyCompact::reich_door_20);
}
}
bool SkyGrid::getGridValues(Compact *cpt, uint32 *resBitNum, uint32 *resWidth) {
uint16 width = SkyCompact::getMegaSet(cpt, cpt->extCompact->megaSet)->gridWidth;
return getGridValues(cpt->xcood, cpt->ycood, width, cpt, resBitNum, resWidth);
}
bool SkyGrid::getGridValues(uint32 x, uint32 y, uint32 width, Compact *cpt, uint32 *resBitNum, uint32 *resWidth) {
uint32 bitPos;
if (y < TOP_LEFT_Y) return false; // off screen
y -= TOP_LEFT_Y;
y >>= 3; // convert to blocks
if (y >= GRID_Y) return false; // off screen
bitPos = y * 40;
width++;
x >>= 3; // convert to blocks
int32 x_signed = (x - (TOP_LEFT_X >> 3));
if (x_signed < 0) { // at least partially off screen
if (x_signed + width <= 0) return false; // completely off screen
else width += x_signed; // adjust width to visible part and continue
// x_signed is negative, so it's +=
}
if ((GAME_SCREEN_WIDTH >> 3) <= x_signed) return false; // off screen
if ((GAME_SCREEN_WIDTH >> 3) < x_signed + width) { // at least partially of screen
if ((uint32)((GAME_SCREEN_WIDTH >> 3) - x_signed) >= width) return false; // off screen
else width -= (GAME_SCREEN_WIDTH >> 3) - x_signed; // adjust width
}
bitPos += x_signed;
int32 screenGridOfs = _gridConvertTable[cpt->screen] * GRID_SIZE;
bitPos += (screenGridOfs << 3); // convert to bits
uint32 tmpBits = 0x1F - (bitPos&0x1F);
bitPos &= ~0x1F; // divide into dword address and bit number
bitPos += tmpBits;
*resBitNum = bitPos;
*resWidth = width;
return true;
}
void SkyGrid::removeObjectFromWalk(Compact *cpt) {
uint32 bitNum, width;
if (getGridValues(cpt, &bitNum, &width))
removeObjectFromWalk(bitNum, width);
}
void SkyGrid::removeObjectFromWalk(uint32 bitNum, uint32 width) {
for (uint32 cnt = 0; cnt < width; cnt++) {
_gameGrids[bitNum >> 3] &= ~(1 << (bitNum & 0x7));
if ((bitNum & 0x1F) == 0)
bitNum += 0x3F;
else bitNum--;
}
}
void SkyGrid::objectToWalk(Compact *cpt) {
uint32 bitNum, width;
if (getGridValues(cpt, &bitNum, &width))
objectToWalk(bitNum, width);
}
void SkyGrid::objectToWalk(uint32 bitNum, uint32 width) {
for (uint32 cnt = 0; cnt < width; cnt++) {
_gameGrids[bitNum >> 3] |= (1 << (bitNum & 0x7));
if ((bitNum & 0x1F) == 0)
bitNum += 0x3F;
else bitNum--;
}
}
void SkyGrid::plotGrid(uint32 x, uint32 y, uint32 width, Compact *cpt) {
uint32 resBitPos, resWidth;
if (getGridValues(x, y, width-1, cpt, &resBitPos, &resWidth))
objectToWalk(resBitPos, resWidth);
}
void SkyGrid::removeGrid(uint32 x, uint32 y, uint32 width, Compact *cpt) {
uint32 resBitPos, resWidth;
if (getGridValues(x, y, width, cpt, &resBitPos, &resWidth))
removeObjectFromWalk(resBitPos, resWidth);
}
uint8 *SkyGrid::giveGrid(uint32 pScreen)
{
return _gameGrids + GRID_SIZE * _gridConvertTable[pScreen];
}
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