Initial commit

engines/ags/engine/ac/move_list.cpp

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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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ags/engine/ac/move_list.h"
+#include "ags/shared/ac/common.h"
+#include "ags/shared/util/bbop.h"
+#include "ags/shared/util/stream.h"
+
+namespace AGS3 {
+
+using namespace AGS::Shared;
+using namespace AGS::Engine;
+
+float MoveList::GetStepLength() const {
+	assert(numstage > 0);
+	float permove_x = fixtof(xpermove[onstage]);
+	float permove_y = fixtof(ypermove[onstage]);
+	return sqrt(permove_x * permove_x + permove_y * permove_y);
+}
+
+float MoveList::GetPixelUnitFraction() const {
+	assert(numstage > 0);
+	float distance = GetStepLength() * onpart;
+	return distance - floor(distance);
+}
+
+void MoveList::SetPixelUnitFraction(float frac) {
+	assert(numstage > 0);
+	float permove_dist = GetStepLength();
+	onpart = permove_dist > 0.f ? (1.f / permove_dist) * frac : 0.f;
+}
+
+void MoveList::ReadFromSavegame_Legacy(Stream *in) {
+	*this = MoveList(); // reset struct
+	for (int i = 0; i < MAXNEEDSTAGES_LEGACY; ++i) {
+		// X & Y was packed as high/low shorts, and hence reversed in lo-end
+		pos[i].Y = in->ReadInt16();
+		pos[i].X = in->ReadInt16();
+	}
+	numstage = in->ReadInt32();
+	in->ReadArrayOfInt32(xpermove, MAXNEEDSTAGES_LEGACY);
+	in->ReadArrayOfInt32(ypermove, MAXNEEDSTAGES_LEGACY);
+	from.X = in->ReadInt32();
+	from.Y = in->ReadInt32();
+	onstage = in->ReadInt32();
+	onpart = static_cast<float>(in->ReadInt32());
+	in->ReadInt32(); // UNUSED
+	in->ReadInt32(); // UNUSED
+	doneflag = in->ReadInt8();
+	direct = in->ReadInt8();
+	in->ReadInt16(); // alignment padding to int32 (finalize struct)
+}
+
+HSaveError MoveList::ReadFromSavegame(Stream *in, int32_t cmp_ver) {
+	if (cmp_ver < kMoveSvgVersion_350) {
+		return new SavegameError(kSvgErr_UnsupportedComponentVersion,
+								 String::FromFormat("Movelist format %d is no longer supported", cmp_ver));
+	}
+
+	*this = MoveList(); // reset struct
+	numstage = in->ReadInt32();
+	if ((numstage == 0) && cmp_ver >= kMoveSvgVersion_36109) {
+		return HSaveError::None();
+	}
+	// TODO: reimplement MoveList stages as vector to avoid these limits
+	if (numstage > MAXNEEDSTAGES) {
+		return new SavegameError(kSvgErr_IncompatibleEngine,
+		                         String::FromFormat("Incompatible number of movelist steps (count: %d, max : %d).", numstage, MAXNEEDSTAGES));
+	}
+
+	from.X = in->ReadInt32();
+	from.Y = in->ReadInt32();
+	onstage = in->ReadInt32();
+	BBOp::IntFloatSwap onpart_u(in->ReadInt32());
+	in->ReadInt32(); // UNUSED
+	in->ReadInt32(); // UNUSED
+	doneflag = in->ReadInt8();
+	direct = in->ReadInt8();
+
+	for (int i = 0; i < numstage; ++i) {
+		// X & Y was packed as high/low shorts, and hence reversed in lo-end
+		pos[i].Y = in->ReadInt16();
+		pos[i].X = in->ReadInt16();
+	}
+	in->ReadArrayOfInt32(xpermove, numstage);
+	in->ReadArrayOfInt32(ypermove, numstage);
+
+	// Some variables require conversion depending on a save version
+	if (cmp_ver < kMoveSvgVersion_36109)
+		onpart = static_cast<float>(onpart_u.val.i32);
+	else
+		onpart = onpart_u.val.f;
+
+	return HSaveError::None();
+}
+
+void MoveList::WriteToSavegame(Stream *out) const {
+	out->WriteInt32(numstage);
+	if (numstage == 0)
+		return;
+
+	out->WriteInt32(from.X);
+	out->WriteInt32(from.Y);
+	out->WriteInt32(onstage);
+	out->WriteInt32(BBOp::IntFloatSwap(onpart).val.i32);
+	out->WriteInt32(0); // UNUSED
+	out->WriteInt32(0); // UNUSED
+	out->WriteInt8(doneflag);
+	out->WriteInt8(direct);
+
+	for (int i = 0; i < numstage; ++i) {
+		// X & Y was packed as high/low shorts, and hence reversed in lo-end
+		out->WriteInt16(pos[i].Y);
+		out->WriteInt16(pos[i].X);
+	}
+	out->WriteArrayOfInt32(xpermove, numstage);
+	out->WriteArrayOfInt32(ypermove, numstage);
+}
+
+} // namespace AGS3