1 files changed, 38 insertions, 0 deletions
diff --git a/src/MathUtil.cpp b/src/MathUtil.cpp
new file mode 100644
index 0000000..3905450
--- /dev/null
+++ b/src/MathUtil.cpp
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+/*
+ * MathUtil.cpp
+ *
+ * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program 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 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "MathUtil.h"
+#include <cmath>
+
+namespace Zoom {
+
+vmml::mat4f MathUtil::perspective(float fovy, float aspect, float zNear) {
+  float f = 1/std::tan(fovy*M_PI/360);
+
+  vmml::mat4f ret(vmml::mat4f::ZERO);
+  ret[0][0] = f/aspect;
+  ret[1][1] = f;
+  ret[2][2] = -1;
+  ret[2][3] = -2*zNear;
+  ret[3][2] = -1;
+
+  return ret;
+}
+
+}