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author | Matthias Schiffer <matthias@gamezock.de> | 2009-12-16 14:58:56 +0100 |
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committer | Matthias Schiffer <matthias@gamezock.de> | 2009-12-16 14:58:56 +0100 |
commit | ea08fea654b4702a77f623b74137fabc7d6800d8 (patch) | |
tree | 7550e20704ee9a93e6b1ea95d72563250956ac17 /src/MathUtil.cpp | |
parent | a407f8b9edbc7a6e865b2daf65b2a6cd10edd2d7 (diff) | |
download | zoom++-ea08fea654b4702a77f623b74137fabc7d6800d8.tar zoom++-ea08fea654b4702a77f623b74137fabc7d6800d8.zip |
Use perspective projection matrix without far clipping plane.
Diffstat (limited to 'src/MathUtil.cpp')
-rw-r--r-- | src/MathUtil.cpp | 38 |
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 @@ -0,0 +1,38 @@ +/* + * 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; +} + +} |