AbstractParticleSystem Class Reference

Abstract additive point‑sprite particle system with a ready‑made GL path. More...

#include <AbstractParticleSystem.h>

Public Member Functions
	AbstractParticleSystem (float pointSize, float refDepth=1.0f)
	Construct the renderer state.
virtual	~AbstractParticleSystem ()
	Virtual destructor.
virtual void	update (float t)=0
	Advance simulation by t seconds (override in derived classes).
void	setPointSize (float pointSize, float refDepth=1.0f)
	Set the base point size and reference depth used by the shader.
float	getPointSize () const
	Current point size at the configured reference depth.
float	getRefDepth () const
	Current reference depth for size computation.
virtual void	setColor (const Vec3 &color)=0
	Set a global color used by the emitter (override in derived classes).
void	render (const Mat4 &v, const Mat4 &p)
	Render all particles using the internal program and point sprite.
Data interface (to implement in subclasses)
virtual std::vector< float >	getData () const =0
	Return interleaved particle attributes.
virtual size_t	getParticleCount () const =0
	Number of particles to draw.

Static Public Member Functions
static Vec3	computeColor (const Vec3 &c)
	Interpret special color sentinel values.

Detailed Description

Abstract additive point‑sprite particle system with a ready‑made GL path.

The class owns a small shader program, a point‑sprite texture, and a dynamic VBO/VAO pair. Derived classes only need to supply the particle data packed as (x,y,z,r,g,b,a) and report the particle count. Colors are multiplied in the fragment stage and blended additively (ONE, ONE).

Constructor & Destructor Documentation

AbstractParticleSystem()

AbstractParticleSystem::AbstractParticleSystem	(	float	pointSize,
		float	refDepth = 1.0f )

Construct the renderer state.

Parameters

pointSize	Desired point size at refDepth (in pixels).
refDepth	Reference eye‑space depth at which pointSize applies.

~AbstractParticleSystem()

virtual AbstractParticleSystem::~AbstractParticleSystem ( )

inlinevirtual

Virtual destructor.

Member Function Documentation

computeColor()

Vec3 AbstractParticleSystem::computeColor ( const Vec3 & c )

static

Interpret special color sentinel values.

Parameters

c	Input color; if equal to RANDOM_COLOR a random color is returned; otherwise the input is forwarded unchanged.

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getData()

virtual std::vector< float > AbstractParticleSystem::getData ( ) const

pure virtual

Return interleaved particle attributes.

The vector must contain 7 floats per particle in the order (x,y,z,r,g,b,a).

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getParticleCount()

virtual size_t AbstractParticleSystem::getParticleCount ( ) const

pure virtual

Number of particles to draw.

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getPointSize()

float AbstractParticleSystem::getPointSize ( ) const

inline

Current point size at the configured reference depth.

getRefDepth()

float AbstractParticleSystem::getRefDepth ( ) const

inline

Current reference depth for size computation.

render()

void AbstractParticleSystem::render	(	const Mat4 &	v,
		const Mat4 &	p )

Render all particles using the internal program and point sprite.

Parameters

v	View matrix.
p	Projection matrix.

Uploads current particle data (via getData()) to a dynamic VBO, sets uniforms, and draws a GL_POINTS array with additive blending. Returns immediately if getParticleCount() is zero.

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setColor()

virtual void AbstractParticleSystem::setColor ( const Vec3 & color )

pure virtual

Set a global color used by the emitter (override in derived classes).

Implementations may treat RANDOM_COLOR and RAINBOW_COLOR as special cases. See also computeColor().

setPointSize()

void AbstractParticleSystem::setPointSize ( float pointSize, float refDepth = 1.0f )

inline

Set the base point size and reference depth used by the shader.

Parameters

pointSize	Desired apparent size in pixels at refDepth.
refDepth	Eye‑space depth at which pointSize holds (z of clip‑space before division).

update()

virtual void AbstractParticleSystem::update ( float t )

pure virtual

Advance simulation by t seconds (override in derived classes).

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

• AbstractParticleSystem.h
• AbstractParticleSystem.cpp