You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
108 lines
3.3 KiB
C++
108 lines
3.3 KiB
C++
/*=========================================================================
|
|
|
|
Program: Visualization Toolkit
|
|
Module: vtkGaussianBlurPass.h
|
|
|
|
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
|
|
All rights reserved.
|
|
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
|
|
|
|
This software is distributed WITHOUT ANY WARRANTY; without even
|
|
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
PURPOSE. See the above copyright notice for more information.
|
|
|
|
=========================================================================*/
|
|
/**
|
|
* @class vtkGaussianBlurPass
|
|
* @brief 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.
|
|
*
|
|
* @par 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
|
|
*
|
|
* @sa
|
|
* vtkRenderPass
|
|
*/
|
|
|
|
#ifndef vtkGaussianBlurPass_h
|
|
#define vtkGaussianBlurPass_h
|
|
|
|
#include "vtkImageProcessingPass.h"
|
|
#include "vtkRenderingOpenGL2Module.h" // For export macro
|
|
|
|
class vtkDepthPeelingPassLayerList; // Pimpl
|
|
class vtkOpenGLFramebufferObject;
|
|
class vtkOpenGLHelper;
|
|
class vtkOpenGLRenderWindow;
|
|
class vtkTextureObject;
|
|
|
|
class VTKRENDERINGOPENGL2_EXPORT vtkGaussianBlurPass : public vtkImageProcessingPass
|
|
{
|
|
public:
|
|
static vtkGaussianBlurPass* New();
|
|
vtkTypeMacro(vtkGaussianBlurPass, vtkImageProcessingPass);
|
|
void PrintSelf(ostream& os, vtkIndent indent) override;
|
|
|
|
/**
|
|
* Perform rendering according to a render state \p s.
|
|
* \pre s_exists: s!=0
|
|
*/
|
|
void Render(const vtkRenderState* s) override;
|
|
|
|
/**
|
|
* Release graphics resources and ask components to release their own
|
|
* resources.
|
|
* \pre w_exists: w!=0
|
|
*/
|
|
void ReleaseGraphicsResources(vtkWindow* w) override;
|
|
|
|
protected:
|
|
/**
|
|
* Default constructor. DelegatePass is set to NULL.
|
|
*/
|
|
vtkGaussianBlurPass();
|
|
|
|
/**
|
|
* Destructor.
|
|
*/
|
|
~vtkGaussianBlurPass() override;
|
|
|
|
/**
|
|
* Graphics resources.
|
|
*/
|
|
vtkOpenGLFramebufferObject* FrameBufferObject;
|
|
vtkTextureObject* Pass1; // render target for the scene
|
|
vtkTextureObject* Pass2; // render target for the horizontal pass
|
|
|
|
// Structures for the various cell types we render.
|
|
vtkOpenGLHelper* BlurProgram;
|
|
|
|
private:
|
|
vtkGaussianBlurPass(const vtkGaussianBlurPass&) = delete;
|
|
void operator=(const vtkGaussianBlurPass&) = delete;
|
|
};
|
|
|
|
#endif
|