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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 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 "bladerunner/view.h"
+
+#include "common/debug.h"
+#include "common/stream.h"
+#include "common/util.h"
+
+namespace BladeRunner {
+
+bool View::readVqa(Common::ReadStream *stream) {
+	_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;
+
+	_viewportPosition.x = 320.0f;
+	_viewportPosition.y = 240.0f;
+	_viewportPosition.z = 320.0f / tan(_fovX / 2.0f);
+}
+
+void View::calculateSliceViewMatrix() {
+	Matrix4x3 mRotation = rotationMatrixX(float(M_PI) / 2.0f);
+	Matrix4x3 mInvert(-1.0f,  0.0f, 0.0f, 0.0f,
+	                   0.0f, -1.0f, 0.0f, 0.0f,
+	                   0.0f,  0.0f, 1.0f, 0.0f);
+	_sliceViewMatrix = mInvert * (_frameViewMatrix * mRotation);
+}
+
+void View::calculateCameraPosition() {
+	Matrix4x3 invertedMatrix = invertMatrix(_sliceViewMatrix);
+
+	_cameraPosition.x = invertedMatrix(0, 3);
+	_cameraPosition.y = invertedMatrix(1, 3);
+	_cameraPosition.z = invertedMatrix(2, 3);
+}
+
+Vector3 View::calculateScreenPosition(Vector3 worldPosition) {
+	Vector3 viewPosition = _frameViewMatrix * worldPosition;
+	return Vector3(
+		_viewportPosition.x - ((viewPosition.x / ABS(viewPosition.z)) * ABS(_viewportPosition.z)),
+		_viewportPosition.y - ((viewPosition.y / ABS(viewPosition.z)) * ABS(_viewportPosition.z)),
+		viewPosition.z
+	);
+}
+
+} // End of namespace BladeRunner