72b43d7151
Before this commit, there were three separate classes (Mapper, Canvas, and View) that were all managing their own version of the background color. As you can imagine, this could easily become out of sync, and in fact if the user code did not specify the same background at least twice, it would not work. Fix this by consolidating the background color management to the Canvas. This is the class most responsible for maintaining the background. All other classes get or set the background from the Canvas. That said, I also removed setting the background color from the constructor in the Canvas. This background color is overridden by the View anyway, so having it there was only confusing.
128 lines
3.7 KiB
C++
128 lines
3.7 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/cont/ArrayPortalToIterators.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(vtkm::Id width=1024,
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vtkm::Id height=1024)
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: CanvasGL()
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{
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ctx = NULL;
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this->ResizeBuffers(width, height);
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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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{
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throw vtkm::cont::ErrorControlBadValue("OSMesa context creation failed.");
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}
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vtkm::Vec<vtkm::Float32,4> *colorBuffer =
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vtkm::cont::ArrayPortalToIteratorBegin(
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this->GetColorBuffer().GetPortalControl());
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if (!OSMesaMakeCurrent(ctx,
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reinterpret_cast<vtkm::Float32*>(colorBuffer),
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GL_FLOAT,
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static_cast<GLsizei>(this->GetWidth()),
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static_cast<GLsizei>(this->GetHeight())))
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{
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throw vtkm::cont::ErrorControlBadValue("OSMesa context activation failed.");
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}
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}
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VTKM_CONT_EXPORT
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virtual void RefreshColorBuffer()
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{
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// Override superclass because our OSMesa implementation renders right
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// to the color buffer.
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}
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VTKM_CONT_EXPORT
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virtual void Activate()
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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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vtkm::rendering::Color backgroundColor = this->GetBackgroundColor();
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glClearColor(backgroundColor.Components[0],
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backgroundColor.Components[1],
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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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// This is disabled because it is handled in RefreshDepthBuffer
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#if 0
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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<vtkm::Id>(w)!=this->GetWidth() ||
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static_cast<vtkm::Id>(h)!=this->GetHeight())
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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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vtkm::cont::ArrayHandle<vtkm::Float32>::PortalControl depthPortal =
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this->GetDepthBuffer().GetPortalControl();
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vtkm::Id npixels = this->GetWidth()*this->GetHeight();
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for (vtkm::Id i=0; i<npixels; i++)
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for (std::size_t i=0; i<npixels; i++)
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{
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depthPortal.Set(i, float(raw_zbuff[i]) / float(UINT_MAX));
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}
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#endif
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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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