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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOpenGLRenderPass.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 vtkOpenGLRenderPass
* @brief Abstract render pass with shader modifications.
*
*
* Allows a render pass to update shader code using a new virtual API.
*/
#ifndef vtkOpenGLRenderPass_h
#define vtkOpenGLRenderPass_h
#include "vtkRenderingOpenGL2Module.h" // For export macro
#include "vtkRenderPass.h"
#include <string> // For std::string
class vtkAbstractMapper;
class vtkInformationObjectBaseVectorKey;
class vtkProp;
class vtkShaderProgram;
class VTKRENDERINGOPENGL2_EXPORT vtkOpenGLRenderPass: public vtkRenderPass
{
public:
vtkTypeMacro(vtkOpenGLRenderPass, vtkRenderPass)
virtual void PrintSelf(ostream &os, vtkIndent indent);
/**
* Use vtkShaderProgram::Substitute to replace //VTK::XXX:YYY declarations in
* the shader sources.
* Return false on error.
*/
virtual bool ReplaceShaderValues(std::string &vertexShader,
std::string &geometryShader,
std::string &fragmentShader,
vtkAbstractMapper *mapper, vtkProp *prop);
/**
* Update the uniforms of the shader program.
* Return false on error.
*/
virtual bool SetShaderParameters(vtkShaderProgram *program,
vtkAbstractMapper *mapper, vtkProp *prop);
/**
* For multi-stage render passes that need to change shader code during a
* single pass, use this method to notify a mapper that the shader needs to be
* rebuilt (rather than reuse the last cached shader. This method should
* return the last time that the shader stage changed, or 0 if the shader
* is single-stage.
*/
virtual vtkMTimeType GetShaderStageMTime();
/**
* Key containing information about the current pass.
*/
static vtkInformationObjectBaseVectorKey *RenderPasses();
protected:
vtkOpenGLRenderPass();
~vtkOpenGLRenderPass();
/**
* Call before rendering to update the actors' information keys.
*/
void PreRender(const vtkRenderState *s);
/**
* Call after rendering to clean up the actors' information keys.
*/
void PostRender(const vtkRenderState *s);
private:
vtkOpenGLRenderPass(const vtkOpenGLRenderPass&) VTK_DELETE_FUNCTION;
void operator=(const vtkOpenGLRenderPass&) VTK_DELETE_FUNCTION;
};
#endif // vtkOpenGLRenderPass_h
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