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.
106 lines
3.1 KiB
C++
106 lines
3.1 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_CanvasOSMesa_h
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#define vtk_m_rendering_CanvasOSMesa_h
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#include <vtkm/Types.h>
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#include <vtkm/rendering/CanvasGL.h>
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#include <vtkm/rendering/Color.h>
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#include <GL/osmesa.h>
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#include <GL/gl.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 CanvasOSMesa : public CanvasGL
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{
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public:
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VTKM_CONT_EXPORT
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CanvasOSMesa(std::size_t w=1024,
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std::size_t h=1024,
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const vtkm::rendering::Color &c =
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vtkm::rendering::Color(0.0f,0.0f,0.0f,1.0f))
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: CanvasGL(w,h,c)
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{
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ctx = NULL;
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}
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VTKM_CONT_EXPORT
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virtual void Initialize()
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{
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ctx = OSMesaCreateContextExt(OSMESA_RGBA, 32, 0, 0, NULL);
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if (!ctx)
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throw vtkm::cont::ErrorControlBadValue("OSMesa context creation failed.");
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this->ColorBuffer.resize(this->Width*this->Height*4);
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if (!OSMesaMakeCurrent(ctx,
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&this->ColorBuffer[0],
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GL_FLOAT,
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static_cast<GLsizei>(this->Width),
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static_cast<GLsizei>(this->Height)))
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{
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throw vtkm::cont::ErrorControlBadValue("OSMesa context activation failed.");
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}
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glEnable(GL_DEPTH_TEST);
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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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glClearColor(this->BackgroundColor.Components[0],
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this->BackgroundColor.Components[1],
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this->BackgroundColor.Components[2],
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1.0f);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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VTKM_CONT_EXPORT
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virtual void Finish()
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{
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CanvasGL::Finish();
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//Copy zbuff into floating point array.
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unsigned int *raw_zbuff;
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int zbytes, w, h;
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GLboolean ret;
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ret = OSMesaGetDepthBuffer(ctx, &w, &h, &zbytes, (void**)&raw_zbuff);
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if (!ret ||
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static_cast<std::size_t>(w)!=this->Width ||
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static_cast<std::size_t>(h)!=this->Height)
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{
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throw vtkm::cont::ErrorControlBadValue("Wrong width/height in ZBuffer");
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}
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std::size_t npixels = this->Width*this->Height;
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for (std::size_t i=0; i<npixels; i++)
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{
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this->DepthBuffer[i] = float(raw_zbuff[i]) / float(UINT_MAX);
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}
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}
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private:
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OSMesaContext ctx;
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};
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}} //namespace vtkm::rendering
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#endif //vtk_m_rendering_CanvasOSMesa_h
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