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https://gitlab.kitware.com/vtk/vtk-m
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fa3e43fbaa
The word surface is more often used for something like a polygonal mesh, so this name is quite confusing. Canvas is consistent with a conventional name in GUI widget APIs.
117 lines
4.2 KiB
C++
117 lines
4.2 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//
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// Copyright 2015 Sandia Corporation.
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// Copyright 2015 UT-Battelle, LLC.
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// Copyright 2015 Los Alamos National Security.
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//
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// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
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// the U.S. Government retains certain rights in this software.
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//
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// Under the terms of Contract DE-AC52-06NA25396 with Los Alamos National
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// Laboratory (LANL), the U.S. Government retains certain rights in
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// this software.
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//============================================================================
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#ifndef vtk_m_rendering_CanvasRayTracer_h
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#define vtk_m_rendering_CanvasRayTracer_h
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#include <vtkm/Types.h>
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#include <vtkm/exec/ExecutionWholeArray.h>
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#include <vtkm/rendering/Canvas.h>
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#include <vtkm/rendering/Color.h>
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#include <vtkm/worklet/WorkletMapField.h>
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#include <vtkm/worklet/DispatcherMapField.h>
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#include <iostream>
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#include <fstream>
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namespace vtkm {
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namespace rendering {
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class CanvasRayTracer : public Canvas
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{
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public:
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VTKM_CONT_EXPORT
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CanvasRayTracer(std::size_t width=1024,
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std::size_t height=1024,
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const vtkm::rendering::Color &color =
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vtkm::rendering::Color(0.0f,0.0f,0.0f,1.0f))
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: Canvas(width,height,color)
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{
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this->ColorArray = vtkm::cont::make_ArrayHandle(this->ColorBuffer);
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this->DepthArray = vtkm::cont::make_ArrayHandle(this->DepthBuffer);
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}
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class ClearBuffers : public vtkm::worklet::WorkletMapField
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{
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vtkm::rendering::Color ClearColor;
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vtkm::Id NumPixels;
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public:
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VTKM_CONT_EXPORT
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ClearBuffers(const vtkm::rendering::Color &clearColor,
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vtkm::Id numPixels)
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: ClearColor(clearColor),
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NumPixels(numPixels)
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{}
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typedef void ControlSignature(FieldOut<>,
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ExecObject);
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typedef void ExecutionSignature(_1,
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_2,
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WorkIndex);
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VTKM_EXEC_EXPORT
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void operator()(vtkm::Float32 &depth,
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vtkm::exec::ExecutionWholeArray<vtkm::Float32> &colorBuffer,
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const vtkm::Id &index) const
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{
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if(index >= NumPixels) return;
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depth = 1.001f;
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vtkm::Id offset = index * 4;
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colorBuffer.Set(offset + 0, ClearColor.Components[0]);
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colorBuffer.Set(offset + 1, ClearColor.Components[1]);
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colorBuffer.Set(offset + 2, ClearColor.Components[2]);
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colorBuffer.Set(offset + 3, ClearColor.Components[3]);
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}
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}; //class ClearBuffers
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VTKM_CONT_EXPORT
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virtual void SaveAs(const std::string &fileName)
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{
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std::ofstream of(fileName.c_str());
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of<<"P6"<<std::endl<<this->Width<<" "<<this->Height<<std::endl<<255<<std::endl;
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int height = static_cast<int>(this->Height);
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for (int yIndex=height-1; yIndex>=0; yIndex--)
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for (std::size_t xIndex=0; xIndex < this->Width; xIndex++)
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{
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const vtkm::Float32 *tuple =
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&(this->ColorBuffer[static_cast<std::size_t>(yIndex)*this->Width*4 + xIndex*4]);
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of<<(unsigned char)(tuple[0]*255);
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of<<(unsigned char)(tuple[1]*255);
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of<<(unsigned char)(tuple[2]*255);
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}
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of.close();
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}
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VTKM_CONT_EXPORT
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virtual void Clear()
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{
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this->ColorArray = vtkm::cont::make_ArrayHandle(this->ColorBuffer);
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this->DepthArray = vtkm::cont::make_ArrayHandle(this->DepthBuffer);
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vtkm::worklet::DispatcherMapField< ClearBuffers >(
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ClearBuffers( this->BackgroundColor,
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static_cast<vtkm::Int32>(this->Width*this->Height) ) )
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.Invoke( this->DepthArray,
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vtkm::exec::ExecutionWholeArray<vtkm::Float32>(this->ColorArray) );
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}
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vtkm::cont::ArrayHandle<vtkm::Float32> ColorArray;
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vtkm::cont::ArrayHandle<vtkm::Float32> DepthArray;
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};
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}} //namespace vtkm::rendering
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#endif //vtk_m_rendering_CanvasRayTracer_h
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