1 files changed, 82 insertions, 0 deletions
diff --git a/engines/bladerunner/view.cpp b/engines/bladerunner/view.cpp
new file mode 100644
index 0000000000..b3b6ad8ad2
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+++ b/engines/bladerunner/view.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 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 "bladerunner/view.h"
+
+#include "common/debug.h"
+#include "common/stream.h"
+
+namespace BladeRunner {
+
+bool View::read(Common::ReadStream *stream) {
+	uint32 frame;
+	frame = stream->readUint32LE();
+
+	float d[12];
+	for (int i = 0; i != 12; ++i)
+		d[i] = stream->readFloatLE();
+
+	_frameViewMatrix = Matrix4x3(d);
+
+	float fovX = stream->readFloatLE();
+
+	setFovX(fovX);
+	calculateSliceViewMatrix();
+	calculateCameraPosition();
+
+	return true;
+}
+
+void View::setFovX(float fovX) {
+	_fovX = fovX;
+
+	_viewportHalfWidth  = 320.0f;
+	_viewportHalfHeight = 240.0f;
+
+	_viewportDistance = 320.0f / tanf(_fovX / 2.0f);
+}
+
+void View::calculateSliceViewMatrix() {
+	Matrix4x3 m = _frameViewMatrix;
+
+	m = m * rotationMatrixX(float(M_PI) / 2.0f);
+
+	Matrix4x3 a( -1.0f,  0.0f,  0.0f,  0.0f,
+	              0.0f, -1.0f,  0.0f,  0.0f,
+	              0.0f,  0.0f,  1.0f,  0.0f);
+
+	m = a * m;
+
+	_sliceViewMatrix = m;
+}
+
+void View::calculateCameraPosition()
+{
+	Matrix4x3 invertedMatrix = invertMatrix(_sliceViewMatrix);
+
+	_cameraPosition.x = invertedMatrix(0, 3);
+	_cameraPosition.y = invertedMatrix(1, 3);
+	_cameraPosition.z = invertedMatrix(2, 3);
+}
+
+
+} // End of namespace BladeRunner