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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 "startrek/startrek.h"
namespace StarTrek {
void StarTrekEngine::initStarfieldPosition() {
memset(&_starfieldPosition, 0, sizeof(_starfieldPosition));
// TODO: matrix initialization
}
void StarTrekEngine::initStarfield(int16 x, int16 y, int16 width, int16 height, int16 arg8) {
_starfieldXVar1 = (x + width) / 2;
_starfieldYVar1 = (y + height) / 2;
_starfieldXVar2 = (width - x + 1) / 2;
_starfieldYVar2 = (height - y + 1) / 2;
_starfieldRect.left = _starfieldXVar1 - _starfieldXVar2;
_starfieldRect.right = _starfieldXVar1 + _starfieldXVar2;
_starfieldRect.top = _starfieldYVar1 - _starfieldYVar2;
_starfieldRect.bottom = _starfieldYVar1 + _starfieldYVar2;
memset(_starList, 0, sizeof(_starList));
_starfieldPointDivisor = 150;
}
void StarTrekEngine::clearStarfieldPixels() {
_gfx->fillBackgroundRect(_starfieldRect, 0);
}
void StarTrekEngine::drawStarfield() {
// TODO: make these class variables
Point3W starPositionWeightings[] = {{0x4000, 0, 0}, {0, 0x4000, 0}, {0, 0, 0x4000}};
float flt_50898 = 50.0; // ?
int16 var28 = ((_starfieldXVar2 * 3) >> 1);
int16 xvar = var28 / 2;
int16 var2a = ((_starfieldYVar2 * 3) >> 1);
int16 yvar = var2a / 2;
int16 var8 = _starfieldPointDivisor << 3;
SharedPtr<FileStream> file = loadFile("stars.shp");
for (int i = 0; i < NUM_STARS; i++) {
Star *star = &_starList[i];
if ((i & 0xf) == 0) {
file->seek(0, SEEK_SET);
}
if (!star->active) {
int16 var4 = getRandomWord() / var28 - xvar;
int16 var6 = getRandomWord() / var2a - yvar;
Point3 point = constructPoint3ForStarfield(var4, var6, var8);
star->pos = applyPointWeightings(starPositionWeightings, point) + _starfieldPosition;
star->active = true;
}
Point3 p = star->pos - _starfieldPosition;
Point3 point2 = applyPointWeightings2(p, starPositionWeightings);
if (point2.z > flt_50898 && point2.z < 0x3fff
&& abs(point2.x) < point2.z && abs(point2.y) < point2.z) {
int16 x = _starfieldXVar1 + (point2.x * _starfieldPointDivisor / point2.z);
int16 y = _starfieldYVar1 - (point2.y * _starfieldPointDivisor / point2.z);
int fileOffset = file->pos();
file->readUint32();
int16 width = file->readUint16();
int16 height = file->readUint16();
Common::Rect starRect(x, y, x + width, y + height);
Common::Rect drawRect = _starfieldRect.findIntersectingRect(starRect);
file->seek(fileOffset, SEEK_SET);
SharedPtr<Bitmap> bitmap = SharedPtr<Bitmap>(new Bitmap(file));
if (!drawRect.isEmpty())
_gfx->drawBitmapToBackground(starRect, drawRect, bitmap);
bitmap.reset();
} else {
star->active = false;
file->readUint32();
int16 offset2 = file->readUint16() * file->readUint16();
file->seek(file->pos() + offset2, SEEK_SET);
}
}
}
void StarTrekEngine::updateStarfieldAndShips(bool arg0) {
_starfieldSprite.bitmapChanged = true;
// sub_24b74(...);
clearStarfieldPixels();
drawStarfield();
// TODO
}
Point3 StarTrekEngine::constructPoint3ForStarfield(int16 x, int16 y, int16 z) {
Point3 point;
point.z = z;
point.y = y * z / _starfieldPointDivisor;
point.x = x * z / _starfieldPointDivisor;
return point;
}
Point3 StarTrekEngine::applyPointWeightings(Point3W *weight, const Point3 &point) {
int32 ret[3];
for (int i = 0; i < 3; i++) {
ret[i] = weight[i].x * (point.x & 0xffff) + weight[i].y * (point.y & 0xffff) + weight[i].z * (point.z & 0xffff);
ret[i] <<= 2;
}
Point3 p;
p.x = ret[0] >> 16;
p.y = ret[1] >> 16;
p.z = ret[2] >> 16;
return p;
}
Point3 StarTrekEngine::applyPointWeightings2(const Point3 &point, Point3W *weight) {
Point3 p = Point3();
p.x = (weight[0].x * (point.x & 0xffff) + weight[1].x * (point.y & 0xffff) + weight[2].x * (point.z & 0xffff)) << 2;
p.y = (weight[0].y * (point.x & 0xffff) + weight[1].y * (point.y & 0xffff) + weight[2].y * (point.z & 0xffff)) << 2;
p.z = (weight[0].z * (point.x & 0xffff) + weight[1].z * (point.y & 0xffff) + weight[2].z * (point.z & 0xffff)) << 2;
p.x >>= 16;
p.y >>= 16;
p.z >>= 16;
return p;
}
}
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