ShadowSpot.cpp

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#include "ShadowSpot.h"
#include "ngl/ShaderManager.h"
#include "ngl/VBOPrimitives.h"
#include "NGLMath.h"
#include "ngl/Matrix.h"
#include "ngl/Util.h"

ShadowSpot::ShadowSpot(const ngl::Vector &_position,
                       const ngl::Vector &_target,
                       const float &_distance,
                       const float &_angle,
                       const ngl::Vector &_col,
                       const ngl::Vector &_up)
{
    //m_shadowMapId = 0;
    this->set(_position,_target,_distance,_angle,_col,_up);
    m_shadowView = m_matrixCam.getModelView();//Lookat(_position, _target, _up, true);
    m_angle = _angle;

    generateProjMatrices();
}


void ShadowSpot::generateProjMatrices()
{
    float aspectRatio = float(1024/768);

    float near = 0.1;
    float far = 300.0;

    // note 1/tan == cotangent
    float f= 1.0/tan(ngl::radians(m_angle)/2.0);

    m_proj.identity();

    m_proj.m_m[0][0]=f/aspectRatio;
    m_proj.m_m[1][1]=f;

    m_proj.m_m[2][2]=(far+near)/(near-far);
    m_proj.m_m[3][2]=(2*far*near)/(near-far);

    m_proj.m_m[2][3]=-1;

    m_projView = m_proj * m_lightView;
    m_frustum.generate(m_projView);
}