BLADERUNNER: Add Vector and Matrix classes

1 files changed, 169 insertions, 0 deletions

diff --git a/engines/bladerunner/matrix.cpp b/engines/bladerunner/matrix.cpp
new file mode 100644
index 0000000000..a55271ed39
--- /dev/null
+++ b/engines/bladerunner/matrix.cpp
@@ -0,0 +1,169 @@
+/* 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/matrix.h"
+
+#include "common/scummsys.h"
+
+namespace BladeRunner {
+
+Matrix3x2::Matrix3x2()
+{
+	for (int r = 0; r != 2; ++r)
+		for (int c = 0; c != 3; ++c)
+			_m[r][c] = (r == c) ? 1.0f : 0.0f;
+}
+
+Matrix3x2::Matrix3x2(float d[6])
+{
+	for (int r = 0; r != 2; ++r)
+		for (int c = 0; c != 3; ++c)
+			_m[r][c] = d[r*3+c];
+}
+
+Matrix3x2::Matrix3x2(
+	float m00, float m01, float m02,
+	float m10, float m11, float m12)
+{
+	_m[0][0] = m00;
+	_m[0][1] = m01;
+	_m[0][2] = m02;
+	_m[1][0] = m10;
+	_m[1][1] = m11;
+	_m[1][2] = m12;
+}
+
+Matrix4x3::Matrix4x3()
+{
+	for (int r = 0; r != 3; ++r)
+		for (int c = 0; c != 4; ++c)
+			_m[r][c] = (r == c) ? 1.0f : 0.0f;
+}
+
+Matrix4x3::Matrix4x3(float d[12])
+{
+	for (int r = 0; r != 3; ++r)
+		for (int c = 0; c != 4; ++c)
+			_m[r][c] = d[r*4+c];
+}
+
+Matrix4x3::Matrix4x3(
+	float m00, float m01, float m02, float m03,
+	float m10, float m11, float m12, float m13,
+	float m20, float m21, float m22, float m23)
+{
+	_m[0][0] = m00;
+	_m[0][1] = m01;
+	_m[0][2] = m02;
+	_m[0][3] = m03;
+	_m[1][0] = m10;
+	_m[1][1] = m11;
+	_m[1][2] = m12;
+	_m[1][3] = m13;
+	_m[2][0] = m20;
+	_m[2][1] = m21;
+	_m[2][2] = m22;
+	_m[2][3] = m23;
+}
+
+Matrix4x3 rotationMatrixX(float angle)
+{
+	float ca = cos(angle);
+	float sa = sin(angle);
+
+	return Matrix4x3( 1.0f, 0.0f, 0.0f, 0.0f,
+	                  0.0f,   ca,   sa, 0.0f,
+	                  0.0f,  -sa,   ca, 0.0f );
+}
+
+static inline
+void swapRows(double *r1, double *r2)
+{
+	for (int c = 0; c != 8; ++c)
+	{
+		double t = r1[c];
+		r1[c] = r2[c];
+		r2[c] = t;
+	}
+}
+
+static inline
+void subtractRow(double *r1, double factor, double *r2)
+{
+	for (int c = 0; c != 8; ++c)
+		r1[c] -= factor * r2[c];
+}
+
+static inline
+void divideRow(double *r1, double d)
+{
+	for (int c = 0; c != 8; ++c)
+		r1[c] /= d;
+}
+
+Matrix4x3 invertMatrix(const Matrix4x3 &m)
+{
+	double w[3][8];
+
+	for (int r = 0; r != 3; ++r) {
+		for (int c = 0; c != 4; ++c) {
+			w[r][c] = m(r, c);
+			w[r][c+4] = (r == c) ? 1.0 : 0.0;
+		}
+	}
+
+	if (w[0][0] == 0.0) {
+		if (w[1][0] != 0.0)
+			swapRows(w[0], w[1]);
+		else
+			swapRows(w[0], w[2]);
+	}
+	divideRow(w[0], w[0][0]);
+	subtractRow(w[1], w[1][0], w[0]);
+	subtractRow(w[2], w[2][0], w[0]);
+
+	if (w[1][1] == 0.0)
+		swapRows(w[1], w[2]);
+
+	divideRow(w[1], w[1][1]);
+	subtractRow(w[0], w[0][1], w[1]);
+	subtractRow(w[2], w[2][1], w[1]);
+
+	divideRow(w[2], w[2][2]);
+	subtractRow(w[0], w[0][2], w[2]);
+	subtractRow(w[1], w[1][2], w[2]);
+
+	for (int r = 0; r != 3; ++r) {
+		w[r][7] = -w[r][3];
+		w[r][3] = 0.0;
+	}
+
+	Matrix4x3 result;
+
+	for (int r = 0; r != 3; ++r)
+		for (int c = 0; c != 4; ++c)
+			result(r, c) = float(w[r][c+4]);
+
+	return result;
+}
+
+} // End of namespace BladeRunner