1 files changed, 110 insertions, 0 deletions
diff --git a/src/ksquirrelpart/sq_glu.cpp b/src/ksquirrelpart/sq_glu.cpp
new file mode 100644
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--- /dev/null
+++ b/src/ksquirrelpart/sq_glu.cpp
@@ -0,0 +1,110 @@
+/***************************************************************************
+                          sq_glu.cpp  -  description
+                             -------------------
+    begin                : ??? ??? 29 2004
+    copyright            : (C) 2004 by Baryshev Dmitry
+    email                : [email protected]
+ ***************************************************************************/
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.5
+ * Copyright (C) 1995-2001  Brian Paul
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the Free
+ * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "sq_glu.h"
+
+#include <cmath>
+
+/*
+ *  Replacement for gluLookAt().
+ */
+void SQ_GLU::gluLookAt(GLdouble eyex, GLdouble eyey, GLdouble eyez, GLdouble centerx, GLdouble centery, GLdouble centerz, GLdouble upx, GLdouble upy, GLdouble upz)
+{
+    GLdouble m[16];
+    GLdouble x[3], y[3], z[3];
+    GLdouble mag;
+
+    z[0] = eyex - centerx;
+    z[1] = eyey - centery;
+    z[2] = eyez - centerz;
+
+    mag = sqrt(z[0] * z[0] + z[1] * z[1] + z[2] * z[2]);
+
+    if(mag)
+    {
+        z[0] /= mag;
+        z[1] /= mag;
+        z[2] /= mag;
+    }
+
+    y[0] = upx;
+    y[1] = upy;
+    y[2] = upz;
+
+    x[0] = y[1] * z[2] - y[2] * z[1];
+    x[1] = -y[0] * z[2] + y[2] * z[0];
+    x[2] = y[0] * z[1] - y[1] * z[0];
+
+    y[0] = z[1] * x[2] - z[2] * x[1];
+    y[1] = -z[0] * x[2] + z[2] * x[0];
+    y[2] = z[0] * x[1] - z[1] * x[0];
+
+    mag = sqrt(x[0] * x[0] + x[1] * x[1] + x[2] * x[2]);
+
+    if(mag)
+    {
+        x[0] /= mag;
+        x[1] /= mag;
+        x[2] /= mag;
+    }
+
+    mag = sqrt(y[0] * y[0] + y[1] * y[1] + y[2] * y[2]);
+
+    if(mag)
+    {
+        y[0] /= mag;
+        y[1] /= mag;
+        y[2] /= mag;
+    }
+
+#define M(row,col)  m[col*4+row]
+    M(0, 0) = x[0];
+    M(0, 1) = x[1];
+    M(0, 2) = x[2];
+    M(0, 3) = 0.0;
+    M(1, 0) = y[0];
+    M(1, 1) = y[1];
+    M(1, 2) = y[2];
+    M(1, 3) = 0.0;
+    M(2, 0) = z[0];
+    M(2, 1) = z[1];
+    M(2, 2) = z[2];
+    M(2, 3) = 0.0;
+    M(3, 0) = 0.0;
+    M(3, 1) = 0.0;
+    M(3, 2) = 0.0;
+    M(3, 3) = 1.0;
+#undef M
+
+    glMultMatrixd(m);
+    glTranslated(-eyex, -eyey, -eyez);
+}