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/*=========================================================================
Program: Visualization Toolkit
Module: vtkOSPRayPass.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 vtkOSPRayPass
* @brief a render pass that uses OSPRay instead of GL
*
* This is a render pass that can be put into a vtkRenderWindow which makes
* it use OSPRay instead of OpenGL to render. Adding/Removing the pass
* will swap back and forth between the two.
*
* OSPRay MPI - OSPRay can use its own internal MPI layer to replicate
* the scene data across mpi processes and composite the image.
* This results in linear performance scaling and supports secondary
* rays. To run in this mode, a special environment variable is supplied
* called VTKOSPRAY_ARGS where commandline flags can be inserted for
* OSPRay's init call. As an example of this, below is a commandline
* for running paraview on localhost, but having OSPRay's rendering
* occur on 2 remote nodes. ospray_mpi_worker is a separate application
* supplied with OSPRay binary packages or when built with MPI support
* from source.
* 'mpirun -ppn 1 -hosts localhost VTKOSPRAY_ARGS="-osp:mpi"
* ./paraview : -hosts n1, n2 ./ospray_mpi_worker -osp:mpi'
*/
#ifndef vtkOSPRayPass_h
#define vtkOSPRayPass_h
#include "vtkRenderPass.h"
#include "vtkRenderingRayTracingModule.h" // For export macro
#include <string> // for std::string
VTK_ABI_NAMESPACE_BEGIN
class vtkCameraPass;
class vtkLightsPass;
class vtkOSPRayPassInternals;
class vtkOSPRayRendererNode;
class vtkOverlayPass;
class vtkRenderPassCollection;
class vtkSequencePass;
class vtkVolumetricPass;
class VTKRENDERINGRAYTRACING_EXPORT vtkOSPRayPass : public vtkRenderPass
{
public:
static vtkOSPRayPass* New();
vtkTypeMacro(vtkOSPRayPass, vtkRenderPass);
void PrintSelf(ostream& os, vtkIndent indent) override;
/**
* Perform rendering according to a render state s.
*/
void Render(const vtkRenderState* s) override;
///@{
/**
* Tells the pass what it will render.
*/
void SetSceneGraph(vtkOSPRayRendererNode*);
vtkGetObjectMacro(SceneGraph, vtkOSPRayRendererNode);
///@}
/**
* Called by the internals of this class
*/
virtual void RenderInternal(const vtkRenderState* s);
///@{
/**
* Wrapper around ospray's init and shutdown that protect
* with a reference count.
*/
///@}
static void RTInit();
static void RTShutdown();
/**
* A run time query to see if OSPRay can possibly work.
*/
static bool IsSupported();
/**
* A run time query to see if a particular backend is available.
* Eg. "OSPRay raycaster", "OSPRay pathtracer" or "OptiX pathtracer".
*/
static bool IsBackendAvailable(const char* name);
protected:
/**
* Default constructor.
*/
vtkOSPRayPass();
/**
* Destructor.
*/
~vtkOSPRayPass() override;
vtkOSPRayRendererNode* SceneGraph;
vtkCameraPass* CameraPass;
vtkLightsPass* LightsPass;
vtkOverlayPass* OverlayPass;
vtkVolumetricPass* VolumetricPass;
vtkSequencePass* SequencePass;
vtkRenderPassCollection* RenderPassCollection;
private:
vtkOSPRayPass(const vtkOSPRayPass&) = delete;
void operator=(const vtkOSPRayPass&) = delete;
vtkOSPRayPassInternals* Internal;
std::string PreviousType;
static int RTDeviceRefCount;
};
VTK_ABI_NAMESPACE_END
#endif
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