PointLight Class Reference

Deferred PointLight class using simple geometry to send to the GPU for per-pixel lighting. More...

#include <PointLight.h>

List of all members.

Public Member Functions
	PointLight ()
	ctor
	PointLight (const ngl::Vector &_centre, const float &_radius, const ngl::Vector &_intensity)
	ctor taking the radius, centre and intensity colour of light
	~PointLight ()
	dtor
void	draw (unsigned int &_vao, const std::string &_shaderName)
	method for drawing the pointlight
bool	collidesWithSphere (const ngl::Vector &_pos, const float &_radius)
	check for collision with sphere
Public Attributes
ngl::Vector	m_pos
	the light position, public for easier access
Private Attributes
float	m_radius
	the light radius
ngl::Vector	m_intensity
	the light colour intensity

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Detailed Description

Deferred PointLight class using simple geometry to send to the GPU for per-pixel lighting.

Definition at line 13 of file PointLight.h.

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Constructor & Destructor Documentation

PointLight::PointLight

(

)

ctor

Definition at line 8 of file PointLight.cpp.

{}

PointLight::PointLight	(	const ngl::Vector &	_centre,
		const float &	_radius,
		const ngl::Vector &	_intensity
	)

ctor taking the radius, centre and intensity colour of light

Parameters:

[in]	_centre	the world space position of light
[in]	_radius	the extent of lights influence
[in]	_intensity	the colour value of the light

Definition at line 9 of file PointLight.cpp.

References m_intensity, m_pos, and m_radius.

{
    m_pos.set(_centre.m_x,_centre.m_y,_centre.m_z);
    m_radius = _radius;
    m_intensity = _intensity;
}

PointLight::~PointLight

(

)

dtor

Definition at line 15 of file PointLight.cpp.

{}

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Member Function Documentation

bool PointLight::collidesWithSphere	(	const ngl::Vector &	_pos,
		const float &	_radius
	)

check for collision with sphere

Parameters:

[in]	_pos	sphere position
[in]	_radius	sphere radius

Definition at line 17 of file PointLight.cpp.

References m_pos, and m_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
	)

method for drawing the pointlight

Parameters:

[in]	_vao	the vao id of pointlight geometry
[in]	_shaderName	the name of the shader to draw with

Definition at line 27 of file PointLight.cpp.

References m_intensity, m_pos, and m_radius.

{
    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);
}

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Member Data Documentation

ngl::Vector PointLight::m_intensity [private]

the light colour intensity

Definition at line 45 of file PointLight.h.

ngl::Vector PointLight::m_pos

the light position, public for easier access

Definition at line 39 of file PointLight.h.

float PointLight::m_radius [private]

the light radius

Definition at line 42 of file PointLight.h.

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The documentation for this class was generated from the following files:

• PointLight.h
• PointLight.cpp