Spotlight for deferred lighting. More...

#include <SpotLight.h>

Inheritance diagram for SpotLight:

Public Member Functions
	SpotLight ()
	SpotLight (const ngl::Vector &_position, const ngl::Vector &_target, const float &_distance, const float &_angle, const ngl::Vector &_col, const ngl::Vector &_up)
	ctor
	~SpotLight ()
void	set (const ngl::Vector &_position, const ngl::Vector &_target, const float &_distance, const float &_angle, const ngl::Vector &_col, const ngl::Vector &_up)
	set method for the lights values
bool	collidesWithSphere (const ngl::Vector &_pos, const float &_rad)
	check for collision with sphere
void	draw (const std::string &_vaoName, const std::string &_shader)
	method for drawing the spotlight
ngl::Matrix	getView ()
	access the light view matrix
ngl::Matrix	getWorld ()
	acces the light world matrix
Protected Attributes
ngl::Camera	m_matrixCam
	a temporary use of ngl camera for shadow matrices
ngl::Matrix	m_lightView
	the lights view matrix
Private Attributes
float	m_radius
	radius of spotlight for near plane clipping
ngl::Matrix	m_world
	world matrix of spotlight
ngl::Vector	m_positionAngle
	the position [xyz] and angle [w] of light
ngl::Vector	m_directionDistance
	the direction [xyz] and distance [w] of light
ngl::Vector	m_colour
	the light colour

Detailed Description

Spotlight for deferred lighting.

Definition at line 15 of file SpotLight.h.

Constructor & Destructor Documentation

SpotLight::SpotLight ( ) [inline]

Definition at line 19 of file SpotLight.h.

{}

SpotLight::SpotLight	(	const ngl::Vector &	_position,
		const ngl::Vector &	_target,
		const float &	_distance,
		const float &	_angle,
		const ngl::Vector &	_col,
		const ngl::Vector &	_up
	)

ctor

Parameters:

[in]	_position	the light pos
[in]	_target	the light lookat pos
[in]	_distance	the reach of the light
[in]	_angle	the cone angle
[in]	_col	the light colour
[in]	_up	the apporximated up vector

Definition at line 13 of file SpotLight.cpp.

{
    this->set(_position,_target,_distance,_angle,_col,_up);
}

SpotLight::~SpotLight ( )

Definition at line 18 of file SpotLight.cpp.

{}

Member Function Documentation

bool SpotLight::collidesWithSphere	(	const ngl::Vector &	_pos,
		const float &	_rad
	)

check for collision with sphere

Parameters:

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

Definition at line 20 of file SpotLight.cpp.

References m_directionDistance.

{
    float radius = m_directionDistance.m_w * 0.5;

    ngl::Vector centre = ngl::Vector(m_directionDistance.m_x, m_directionDistance.m_y, m_directionDistance.m_z) * (m_directionDistance.m_w * 0.5);

    ngl::Vector length = centre-_pos;
    float lengthSq = length.lengthSquared();

    float radiiSq = (radius*radius)*1.5 /*scale up to avoid nasty culling */ + (_rad*_rad);

    return lengthSq < radiiSq;
}

void SpotLight::draw	(	const std::string &	_vaoName,
		const std::string &	_shader
	)

method for drawing the spotlight

Parameters:

[in]	_vaoName	the ngl vboPrimitive of spotlight geometry
[in]	_shaderName	the name of the shader to draw with

Definition at line 34 of file SpotLight.cpp.

References m_colour, m_directionDistance, m_positionAngle, and m_world.

{
    ngl::ShaderManager *shader = ngl::ShaderManager::instance();

    (*shader)[_shader]->use();

    shader->setShaderParamFromMatrix(_shader, "u_ModelMatrix", m_world);
    shader->setShaderParamFromVector(_shader, "a_PositionAngle", m_positionAngle);
    shader->setShaderParamFromVector(_shader, "a_DirectionDistance", m_directionDistance);
    shader->setShaderParamFromVector(_shader, "a_Colour", m_colour);

    ngl::VBOPrimitives *prim = ngl::VBOPrimitives::instance();
    prim->draw(_vaoName);
}

ngl::Matrix SpotLight::getView ( ) [inline]

access the light view matrix

Definition at line 53 of file SpotLight.h.

References m_lightView.

{return m_lightView;}

ngl::Matrix SpotLight::getWorld ( ) [inline]

acces the light world matrix

Definition at line 56 of file SpotLight.h.

References m_world.

{return m_world;}

void SpotLight::set	(	const ngl::Vector &	_position,
		const ngl::Vector &	_target,
		const float &	_distance,
		const float &	_angle,
		const ngl::Vector &	_col,
		const ngl::Vector &	_up
	)

set method for the lights values

Parameters:

[in]	_position	the light pos
[in]	_target	the light lookat pos
[in]	_distance	the reach of the light
[in]	_angle	the cone angle
[in]	_col	the light colour
[in]	_up	the apporximated up vector

Definition at line 49 of file SpotLight.cpp.

References Inverse(), Lookat(), m_colour, m_directionDistance, m_lightView, m_matrixCam, m_positionAngle, and m_world.

{
    const float xyscale = _distance*sinf( ( _angle*.5)*ngl::PI/180 ) * 1.1f; // Scaling up to avoid hard edges eating the light

    ngl::Matrix scale, invView, trans;

    scale.scale(xyscale,xyscale,_distance);

    m_matrixCam = ngl::Camera(_position, _target, _up, ngl::PERSPECTIVE);

    m_lightView = Lookat(_position,_target,_up);
    invView = Inverse(m_lightView);
    
    //magic number to get ngl cone into position
    trans.translate(0,0,-1);

    m_world =  invView * scale * trans;

    ngl::Vector direction = _target-_position;
    direction.normalize();

    m_positionAngle = _position;
    m_positionAngle.m_w=cos( ( _angle*.5)*ngl::PI/180 );
    m_directionDistance = direction;
    m_directionDistance.m_w=_distance;
    m_colour = _col;
}

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Member Data Documentation

ngl::Vector SpotLight::m_colour [private]

the light colour

Definition at line 81 of file SpotLight.h.

ngl::Vector SpotLight::m_directionDistance [private]

the direction [xyz] and distance [w] of light

Definition at line 78 of file SpotLight.h.

ngl::Matrix SpotLight::m_lightView [protected]

the lights view matrix

Definition at line 64 of file SpotLight.h.

ngl::Camera SpotLight::m_matrixCam [protected]

a temporary use of ngl camera for shadow matrices

Definition at line 61 of file SpotLight.h.

ngl::Vector SpotLight::m_positionAngle [private]

the position [xyz] and angle [w] of light

Definition at line 75 of file SpotLight.h.

float SpotLight::m_radius [private]

radius of spotlight for near plane clipping

Definition at line 69 of file SpotLight.h.

ngl::Matrix SpotLight::m_world [private]

world matrix of spotlight

Definition at line 72 of file SpotLight.h.

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

SpotLight Class Reference

Public Member Functions

Protected Attributes

Private Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation