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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/system.h"
#include "common/debug.h"
#include "common/error.h"
#include "common/file.h"
#include "common/stream.h"
#include "adl/hires4.h"
#include "adl/detection.h"
#include "adl/display.h"
#include "adl/graphics.h"
#include "adl/disk.h"
namespace Adl {
HiRes4Engine::~HiRes4Engine() {
delete _disk2;
delete _disk3;
}
void HiRes4Engine::init() {
_graphics = new Graphics_v2(*_display);
const char *const *names = getDiskImageNames();
_disk = new DiskImage();
if (!_disk->open(names[0]))
error("Failed to open disk image '%s'", names[0]);
_disk2 = new DiskImage();
if (!_disk2->open(names[1]))
error("Failed to open disk image '%s'", names[1]);
_disk3 = new DiskImage();
if (!_disk3->open(names[2]))
error("Failed to open disk image '%s'", names[2]);
StreamPtr stream(createReadStream(_disk, 0x06, 0xd, 0x12, 2));
loadItemDescriptions(*stream, IDI_HR4_NUM_ITEM_DESCS);
stream.reset(createReadStream(_disk, 0x05, 0x4, 0x00, 3));
loadWords(*stream, _verbs, _priVerbs);
stream.reset(createReadStream(_disk, 0x03, 0xb, 0x00, 6));
loadWords(*stream, _nouns, _priNouns);
}
void HiRes4Engine::initGameState() {
StreamPtr stream(createReadStream(_disk, 0x02, 0xc, 0x00, 12));
loadItems(*stream);
}
Common::SeekableReadStream *HiRes4Engine::createReadStream(DiskImage *disk, byte track, byte sector, byte offset, byte size) const {
adjustDataBlockPtr(track, sector, offset, size);
return disk->createReadStream(track, sector, offset, size);
}
void HiRes4Engine_Atari::adjustDataBlockPtr(byte &track, byte §or, byte &offset, byte &size) const {
// Convert the Apple II disk offsets in the game, to Atari disk offsets
uint sectorIndex = (track * 16 + sector + 1) << 1;
// Atari uses 128 bytes per sector vs. 256 on the Apple II
// Note that size indicates *additional* sectors to read after reading one sector
size *= 2;
if (offset >= 128) {
// Offset in the second half of an Apple II sector, skip one sector and adjust offset
++sectorIndex;
offset -= 128;
} else {
// Offset in the first half of an Apple II sector, we need to read one additional sector
++size;
}
// Compute track/sector for Atari's 18 sectors per track (sectorIndex is 1-based)
track = (sectorIndex - 1) / 18;
sector = (sectorIndex - 1) % 18;
}
const char *const *HiRes4Engine_Atari::getDiskImageNames() const {
static const char *const disks[] = { "ULYS1A.XFD", "ULYS1B.XFD", "ULYS2C.XFD" };
return disks;
}
Engine *HiRes4Engine_create(OSystem *syst, const AdlGameDescription *gd) {
switch (gd->desc.platform) {
case Common::kPlatformAtariST:
return new HiRes4Engine_Atari(syst, gd);
default:
error("Unsupported platform");
}
}
} // End of namespace Adl
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