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Coin / src / nodes / SoSpotLight.cpp

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/**************************************************************************\
 * Copyright (c) Kongsberg Oil & Gas Technologies AS
 * 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 copyright holder 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
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
\**************************************************************************/

/*!
  \class SoSpotLight SoSpotLight.h Inventor/nodes/SoSpotLight.h
  \brief The SoSpotLight class is a node type for light sources with a cone shaped lightvolume.
  \ingroup nodes

  Spotlights are light sources with a position and a direction. They
  can be thought of as a pointlight with a lampshade.

  See also documentation of parent class for important information
  regarding light sources in general.

  <b>FILE FORMAT/DEFAULTS:</b>
  \code
    SpotLight {
        on TRUE
        intensity 1
        color 1 1 1
        location 0 0 1
        direction 0 0 -1
        dropOffRate 0
        cutOffAngle 0.78539819
    }
  \endcode

  \sa SoSpotLight
*/

// *************************************************************************

#include <Inventor/nodes/SoSpotLight.h>

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif // HAVE_CONFIG_H

#include <Inventor/SbColor4f.h>
#include <Inventor/SbVec4f.h>
#include <Inventor/actions/SoGLRenderAction.h>
#include <Inventor/elements/SoEnvironmentElement.h>
#include <Inventor/elements/SoGLLightIdElement.h>
#include <Inventor/elements/SoModelMatrixElement.h>
#include <Inventor/elements/SoViewingMatrixElement.h>
#include <Inventor/elements/SoLightElement.h>
#include <Inventor/errors/SoDebugError.h>
#include <Inventor/system/gl.h>

#include "nodes/SoSubNodeP.h"

// *************************************************************************

/*!
  \var SoSFVec3f SoSpotLight::location

  3D position of light source. Default position is <0, 0, 1>.
*/
/*!
  \var SoSFVec3f SoSpotLight::direction

  Direction vector, where the light is pointing. Default is to point
  along the negative z-axis.
*/
/*!
  \var SoSFFloat SoSpotLight::dropOffRate

  The rate of intensity drop-off from the ray along the direction
  vector. Value must be between 0.0 (equal intensity for the whole
  cone of light), to 1.0 (a narrow intensity ray).

  Default value is 0.0.
*/
/*!
  \var SoSFFloat SoSpotLight::cutOffAngle

  The angle in radians from the direction vector where there will be
  no light outside (i.e. the angle of the "lampshade"). Default value
  is PI/4.0 (i.e. 45�). The value of this field will be clamped to
  [0.0, PI/2] before it is used.
*/


// *************************************************************************

SO_NODE_SOURCE(SoSpotLight);

// *************************************************************************

/*!
  Constructor.
*/
SoSpotLight::SoSpotLight(void)
{
  SO_NODE_INTERNAL_CONSTRUCTOR(SoSpotLight);

  SO_NODE_ADD_FIELD(location, (0.0f, 0.0f, 1.0f));
  SO_NODE_ADD_FIELD(direction, (0.0f, 0.0f, -1.0f));
  SO_NODE_ADD_FIELD(dropOffRate, (0.0f));
  SO_NODE_ADD_FIELD(cutOffAngle, (float(M_PI)/4.0f));
}

/*!
  Destructor.
*/
SoSpotLight::~SoSpotLight()
{
}

// Doc in superclass.
void
SoSpotLight::initClass(void)
{
  SO_NODE_INTERNAL_INIT_CLASS(SoSpotLight, SO_FROM_INVENTOR_1|SoNode::VRML1);
}

// Doc in superclass.
void
SoSpotLight::GLRender(SoGLRenderAction * action)
{
  if (!this->on.getValue()) return;

  SoState * state = action->getState();
  int idx = SoGLLightIdElement::increment(state);

  if (idx < 0) {
#if COIN_DEBUG
    SoDebugError::post("SoSpotLight::GLRender()",
                       "Max # lights exceeded :(\n");
#endif // COIN_DEBUG
    return;
  }

  SoLightElement::add(state, this, SoModelMatrixElement::get(state) *
                      SoViewingMatrixElement::get(state));

  GLenum light = (GLenum) (idx + GL_LIGHT0);

  SbVec3f attenuation = SoEnvironmentElement::getLightAttenuation(state);

  glLightf(light, GL_QUADRATIC_ATTENUATION, attenuation[0]);
  glLightf(light, GL_LINEAR_ATTENUATION, attenuation[1]);
  glLightf(light, GL_CONSTANT_ATTENUATION, attenuation[2]);

  SbColor4f lightcolor(0.0f, 0.0f, 0.0f, 1.0f);
  // disable ambient contribution from this light source
  glLightfv(light, GL_AMBIENT, lightcolor.getValue());
  lightcolor.setRGB(this->color.getValue());
  lightcolor *= this->intensity.getValue();

  glLightfv(light, GL_DIFFUSE, lightcolor.getValue());
  glLightfv(light, GL_SPECULAR, lightcolor.getValue());

  SbVec3f loc = this->location.getValue();

  // point (or spot) light when w = 1.0
  SbVec4f posvec(loc[0], loc[1], loc[2], 1.0f);
  glLightfv(light, GL_POSITION, posvec.getValue());
  glLightfv(light, GL_SPOT_DIRECTION, this->direction.getValue().getValue());

  float cutoff = this->cutOffAngle.getValue() * 180.0f / float(M_PI);
  float dropoff = SbClamp(this->dropOffRate.getValue(), 0.0f, 1.0f) * 128.0f;
  
#ifdef COIN_EXTRA_DEBUG // output a warning if the cutoff is invalid
                        // since we now clamp it (someone might have
                        // been setting it to 180.0, which would make
                        // this a PointLight)
  if (cutoff < 0.0f || cutoff > 90.0f) {
    SoDebugError::postWarning("SoSpotLight::GLRender",
                              "invalid cutOffAngle for SpotLight: %f, clamping to [0.0f, 90.0f]", cutoff);
  }
#endif // COIN_EXTRA_DEBUG

  cutoff = SbClamp(cutoff, 0.0f, 90.0f);

  glLightf(light, GL_SPOT_EXPONENT, dropoff);
  glLightf(light, GL_SPOT_CUTOFF, cutoff);
}