vtkGaussianBlurPass Class Reference

#include <vtkGaussianBlurPass.h>

Inheritance diagram for vtkGaussianBlurPass:

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Collaboration diagram for vtkGaussianBlurPass:

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List of all members.

Detailed Description

Implement a post-processing Gaussian blur render pass.

Blur the image renderered by its delegate. Blurring uses a Gaussian low-pass filter with a 5x5 kernel.

This pass expects an initialized depth buffer and color buffer. Initialized buffers means they have been cleared with farest z-value and background color/gradient/transparent color. An opaque pass may have been performed right after the initialization.

The delegate is used once.

Its delegate is usually set to a vtkCameraPass or to a post-processing pass.

This pass requires a OpenGL context that supports texture objects (TO), framebuffer objects (FBO) and GLSL. If not, it will emit an error message and will render its delegate and return.

Implementation:: As the filter is separable, it first blurs the image horizontally and then vertically. This reduces the number of texture sampling to 5 per pass. In addition, as texture sampling can already blend texel values in linear mode, by adjusting the texture coordinate accordingly, only 3 texture sampling are actually necessary. Reference: OpenGL Bloom Toturial by Philip Rideout, section Exploit Hardware Filtering http://prideout.net/bloom/index.php#Sneaky

See also:: vtkRenderPass

Tests:: vtkGaussianBlurPass (Tests)

Definition at line 63 of file vtkGaussianBlurPass.h.


Public Types
typedef vtkRenderPass	Superclass
Public Member Functions
virtual const char *	GetClassName ()
virtual int	IsA (const char *type)
void	PrintSelf (ostream &os, vtkIndent indent)
virtual void	Render (const vtkRenderState *s)
void	ReleaseGraphicsResources (vtkWindow *w)

virtual vtkRenderPass *	GetDelegatePass ()
virtual void	SetDelegatePass (vtkRenderPass *delegatePass)
Static Public Member Functions
static vtkGaussianBlurPass *	New ()
static int	IsTypeOf (const char *type)
static vtkGaussianBlurPass *	SafeDownCast (vtkObject *o)
Protected Member Functions
	vtkGaussianBlurPass ()
virtual	~vtkGaussianBlurPass ()
Protected Attributes
vtkRenderPass *	DelegatePass

vtkFrameBufferObject *	FrameBufferObject
vtkTextureObject *	Pass1
vtkTextureObject *	Pass2
vtkShaderProgram2 *	BlurProgram

Member Typedef Documentation

typedef vtkRenderPass vtkGaussianBlurPass::Superclass

Reimplemented from vtkRenderPass.

Definition at line 67 of file vtkGaussianBlurPass.h.

Constructor & Destructor Documentation

vtkGaussianBlurPass::vtkGaussianBlurPass ( ) [protected]

Default constructor. DelegatePass is set to NULL.

virtual vtkGaussianBlurPass::~vtkGaussianBlurPass ( ) [protected, virtual]

Destructor.

Member Function Documentation

static vtkGaussianBlurPass* vtkGaussianBlurPass::New ( ) [static]

Create an object with Debug turned off, modified time initialized to zero, and reference counting on.

Reimplemented from vtkObject.

virtual const char* vtkGaussianBlurPass::GetClassName ( ) [virtual]

Reimplemented from vtkRenderPass.

static int vtkGaussianBlurPass::IsTypeOf ( const char * name ) [static]

Return 1 if this class type is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkRenderPass.

virtual int vtkGaussianBlurPass::IsA ( const char * name ) [virtual]

Return 1 if this class is the same type of (or a subclass of) the named class. Returns 0 otherwise. This method works in combination with vtkTypeRevisionMacro found in vtkSetGet.h.

Reimplemented from vtkRenderPass.

static vtkGaussianBlurPass* vtkGaussianBlurPass::SafeDownCast ( vtkObject * o ) [static]

Reimplemented from vtkRenderPass.

void vtkGaussianBlurPass::PrintSelf	(	ostream &	os,
		vtkIndent	indent
	)			`[virtual]`

Methods invoked by print to print information about the object including superclasses. Typically not called by the user (use Print() instead) but used in the hierarchical print process to combine the output of several classes.

Reimplemented from vtkRenderPass.

virtual void vtkGaussianBlurPass::Render ( const vtkRenderState * s ) [virtual]

Perform rendering according to a render state s.

Precondition:: s_exists: s!=0

Implements vtkRenderPass.

void vtkGaussianBlurPass::ReleaseGraphicsResources ( vtkWindow * w ) [virtual]

Release graphics resources and ask components to release their own resources.

Precondition:: w_exists: w!=0

Reimplemented from vtkRenderPass.

virtual vtkRenderPass* vtkGaussianBlurPass::GetDelegatePass ( ) [virtual]

Delegate for rendering the image to be blurred. If it is NULL, nothing will be rendered and a warning will be emitted. It is usually set to a vtkCameraPass or to a post-processing pass. Initial value is a NULL pointer.

virtual void vtkGaussianBlurPass::SetDelegatePass ( vtkRenderPass * delegatePass ) [virtual]

Delegate for rendering the image to be blurred. If it is NULL, nothing will be rendered and a warning will be emitted. It is usually set to a vtkCameraPass or to a post-processing pass. Initial value is a NULL pointer.