SSAO Class Reference

Computes screen space ambient occlusion from a depth and view-space normal buffer (brought to [0,1]). More...

#include <SSAO.hpp>

Public Types
enum class	Quality : int { LOW = 0 , MEDIUM = 1 , HIGH = 2 }

Public Member Functions
	SSAO (uint width, uint height, uint downscale, float radius, const std::string &name)
void	process (const glm::mat4 &projection, const Texture &depthTex, const Texture &normalTex)
void	resize (uint width, uint height)
void	clear () const
const Texture *	texture () const
float &	radius ()
Quality &	quality ()

Private Attributes
Texture	_ssaoTexture
	SSAO texture.
Texture	_finalTexture
	SSAO texture.
BilateralBlur	_highBlur
	High quality blur.
BoxBlur	_mediumBlur
	Medium quality blur.
Program *	_programSSAO
	The SSAO program.
UniformBuffer< glm::vec4 >	_samples
	The 3D directional samples.
Texture	_noisetexture = Texture("SSAO noise")
	Random noise texture.
float	_radius = 0.5f
	SSAO intersection test radius.
uint	_downscale = 1
	SSAO internal resolution downscaling.
Quality	_quality = Quality::MEDIUM
	Quality of the upscaling/blurring.

Detailed Description

Computes screen space ambient occlusion from a depth and view-space normal buffer (brought to [0,1]).

See also

GPU::Frag::SSAO

Member Enumeration Documentation

Quality

enum class SSAO::Quality : int

strong

SSAO upscaling/blurring algorithm.

Enumerator
LOW	Bilinear upscaling.
MEDIUM	Approximate box blur and bilinear upscaling.
HIGH	Bilateral blur.

Constructor & Destructor Documentation

SSAO()

SSAO::SSAO	(	uint	width,
		uint	height,
		uint	downscale,
		float	radius,
		const std::string &	name
	)

Constructor.

Parameters

width	the internal resolution width
height	the internal resolution height
downscale	the downscaling factor for the resolution when computing AO
radius	the SSAO intersection test radius
name	the debug name for internal buffers

Member Function Documentation

clear()

void SSAO::clear

(

)

const

Clear the final texture.

process()

void SSAO::process	(	const glm::mat4 &	projection,
		const Texture &	depthTex,
		const Texture &	normalTex
	)

Compute SSAO using the input depth and normal buffers.

Parameters

projection	the camera projection matrix
depthTex	the depth texture
normalTex	the view-space normal texture

quality()

SSAO::Quality & SSAO::quality

(

)

Quality of the blur applied to the SSAO result.

Returns

a reference to the option

radius()

float & SSAO::radius

(

)

Query the SSAO radius (should be larger for larger scene with large planar surfaces).

Returns

a reference to the radius parameter

resize()

void SSAO::resize	(	uint	width,
		uint	height
	)

Resize the internal buffers.

Parameters

width	the new width
height	the new height

texture()

const Texture * SSAO::texture

(

)

const

Query the texture containing the result of the SSAO+blur pass.

Returns

the texture

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

• src/engine/processing/SSAO.hpp
• src/engine/processing/SSAO.cpp