orthographic.cpp

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/*
 * Copyright (c) 2012, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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 */
 
#include "orthographic.h"
 
#include <OgreMatrix4.h>
 
namespace rviz
{
void buildScaledOrthoMatrix(Ogre::Matrix4& proj,
                            float left,
                            float right,
                            float bottom,
                            float top,
                            float near,
                            float far)
{
  float invw = 1 / (right - left);
  float invh = 1 / (top - bottom);
  float invd = 1 / (far - near);
 
  proj = Ogre::Matrix4::ZERO;
  proj[0][0] = 2 * invw;
  proj[0][3] = -(right + left) * invw;
  proj[1][1] = 2 * invh;
  proj[1][3] = -(top + bottom) * invh;
  proj[2][2] = -2 * invd;
  proj[2][3] = -(far + near) * invd;
  proj[3][3] = 1;
}
 
} // namespace rviz