Implement a post-processing Gaussian blur render pass. More...

#include <vtkGaussianBlurPass.h>

Inheritance diagram for vtkGaussianBlurPass:

Collaboration diagram for vtkGaussianBlurPass:

Public Types
typedef vtkImageProcessingPass	Superclass
Public Member Functions
virtual int	IsA (const char *type)
vtkGaussianBlurPass *	NewInstance () const
void	PrintSelf (ostream &os, vtkIndent indent)
void	ReleaseGraphicsResources (vtkWindow *w)

virtual void	Render (const vtkRenderState *s)
Static Public Member Functions
static vtkGaussianBlurPass *	New ()
static int	IsTypeOf (const char *type)
static vtkGaussianBlurPass *	SafeDownCast (vtkObjectBase *o)
Protected Member Functions
virtual vtkObjectBase *	NewInstanceInternal () const
	vtkGaussianBlurPass ()
virtual	~vtkGaussianBlurPass ()
Protected Attributes
bool	Supported
bool	SupportProbed

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

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 64 of file vtkGaussianBlurPass.h.

Member Typedef Documentation

typedef vtkImageProcessingPass vtkGaussianBlurPass::Superclass

Reimplemented from vtkImageProcessingPass.

Definition at line 68 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.

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 vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkImageProcessingPass.

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 vtkTypeMacro found in vtkSetGet.h.

Reimplemented from vtkImageProcessingPass.

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

Reimplemented from vtkImageProcessingPass.

virtual vtkObjectBase* vtkGaussianBlurPass::NewInstanceInternal ( ) const [protected, virtual]

Reimplemented from vtkImageProcessingPass.

vtkGaussianBlurPass* vtkGaussianBlurPass::NewInstance ( ) const

Reimplemented from vtkImageProcessingPass.

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 vtkImageProcessingPass.

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

Perform rendering according to a render state s.