1 files changed, 84 insertions, 0 deletions

diff --git a/src/others/mimesh/libg3d-0.0.8/src/vector.c b/src/others/mimesh/libg3d-0.0.8/src/vector.c
new file mode 100644
index 0000000..97b3c26
--- /dev/null
+++ b/src/others/mimesh/libg3d-0.0.8/src/vector.c
@@ -0,0 +1,84 @@
+/* $Id$ */
+
+/*
+    libg3d - 3D object loading library
+
+    Copyright (C) 2005-2009  Markus Dahms <mad@automagically.de>
+
+    This library is free software; you can redistribute it and/or
+    modify it under the terms of the GNU Lesser General Public
+    License as published by the Free Software Foundation; either
+    version 2.1 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
+    Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public
+    License along with this library; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <math.h>
+#include <g3d/types.h>
+
+EAPI
+gboolean g3d_vector_normal(G3DVector ax, G3DVector ay, G3DVector az,
+        G3DVector bx, G3DVector by, G3DVector bz,
+        G3DVector *nx, G3DVector *ny, G3DVector *nz)
+{
+        *nx = ay * bz - az * by;
+        *ny = az * bx - ax * bz;
+        *nz = ax * by - ay * bx;
+
+        return TRUE;
+}
+
+EAPI
+gboolean g3d_vector_unify(G3DVector *nx, G3DVector *ny, G3DVector *nz)
+{
+        G3DFloat r;
+
+        r = sqrt(*nx * *nx + *ny * *ny + *nz * *nz);
+        if(r == 0.0F)
+                *nx = *ny = *nz = 0.0F;
+        else {
+                *nx /= r;
+                *ny /= r;
+                *nz /= r;
+        }
+
+        return TRUE;
+}
+
+EAPI
+gboolean g3d_vector_transform(G3DVector *x, G3DVector *y, G3DVector *z,
+        G3DMatrix *matrix)
+{
+        G3DVector vector[4], result[4];
+        guint32 i, k;
+
+        vector[0] = *x;
+        vector[1] = *y;
+        vector[2] = *z;
+        vector[3] = 1.0;
+
+        for(i = 0; i < 4; i ++) {
+                result[i] = 0.0;
+
+                for(k = 0; k < 4; k ++)
+#if 0
+                        result[i] += matrix[i * 4 + k] * vector[k];
+#else
+                        result[i] += matrix[k * 4 + i] * vector[k];
+#endif
+        }
+
+        *x = result[0];
+        *y = result[1];
+        *z = result[2];
+
+        return TRUE;
+}
+