STARTREK: Move space functions into separate file

1 files changed, 154 insertions, 0 deletions

diff --git a/engines/startrek/space.cpp b/engines/startrek/space.cpp
new file mode 100644
index 0000000000..1171952ed4
--- /dev/null
+++ b/engines/startrek/space.cpp
@@ -0,0 +1,154 @@
+/* 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;
+}
+
+}