PointLight.cpp

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#include "PointLight.h"
#include "ngl/ShaderManager.h"
#include "ngl/Types.h"
#include "ngl/TransformStack.h"
#include "ngl/VBOPrimitives.h"
#include "ngl/Util.h"

PointLight::PointLight(){}
PointLight::PointLight(const ngl::Vector &_centre,const float &_radius, const ngl::Vector &_intensity)
{
    m_pos.set(_centre.m_x,_centre.m_y,_centre.m_z);
    m_radius = _radius;
    m_intensity = _intensity;
}
PointLight::~PointLight(){}

bool PointLight::collidesWithSphere(const ngl::Vector &_pos, const float &_radius)
{
    ngl::Vector length = m_pos-_pos;
    float lengthSq = length.lengthSquared();

    float radiiSq = (m_radius*m_radius) + (_radius*_radius);

    return lengthSq < radiiSq;
}

void PointLight::draw(unsigned int &_vao, const std::string &_shaderName)
{
    ngl::ShaderManager *shader = ngl::ShaderManager::instance();
    (*shader)[_shaderName]->use();

    shader->setShaderParam3f(_shaderName,
                             "u_RGBIntensity",
                             m_intensity.m_x,
                             m_intensity.m_y,
                             m_intensity.m_z);

    shader->setShaderParam4f(_shaderName,
                             "u_WSCentreRadius",
                             m_pos.m_x,
                             m_pos.m_y,
                             m_pos.m_z,
                             m_radius
                             );

    // now we bind back our vertex array object and draw
    glBindVertexArray(_vao);

    glDrawArrays(GL_QUADS, 0, 24);

     //go back to default just incase
    glEnableVertexAttribArray(0);
    glBindVertexArray(0);
}