mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-19 18:45:43 +00:00
121 lines
3.0 KiB
C++
121 lines
3.0 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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//
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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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#include <vtkm/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 <vtkm/rendering/internal/OpenGLHeaders.h>
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#ifndef GLAPI
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#define GLAPI extern
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#endif
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#ifndef GLAPIENTRY
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#define GLAPIENTRY
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#endif
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#ifndef APIENTRY
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#define APIENTRY GLAPIENTRY
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#endif
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#include <GL/osmesa.h>
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namespace vtkm
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{
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namespace rendering
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{
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namespace detail
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{
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struct CanvasOSMesaInternals
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{
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OSMesaContext Context;
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};
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} // namespace detail
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CanvasOSMesa::CanvasOSMesa(vtkm::Id width, vtkm::Id height)
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: CanvasGL(width, height)
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, Internals(new detail::CanvasOSMesaInternals)
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{
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this->Internals->Context = nullptr;
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this->ResizeBuffers(width, height);
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}
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CanvasOSMesa::~CanvasOSMesa()
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{
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}
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void CanvasOSMesa::Initialize()
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{
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this->Internals->Context = OSMesaCreateContextExt(OSMESA_RGBA, 32, 0, 0, nullptr);
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if (!this->Internals->Context)
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{
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throw vtkm::cont::ErrorBadValue("OSMesa context creation failed.");
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}
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vtkm::Vec4f_32* colorBuffer = this->GetColorBuffer().GetStorage().GetArray();
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if (!OSMesaMakeCurrent(this->Internals->Context,
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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::ErrorBadValue("OSMesa context activation failed.");
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}
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}
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void CanvasOSMesa::RefreshColorBuffer() const
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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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void CanvasOSMesa::Activate()
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{
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glEnable(GL_DEPTH_TEST);
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}
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void CanvasOSMesa::Finish()
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{
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this->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(this->Internals->Context, &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::ErrorBadValue("Wrong width/height in ZBuffer");
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}
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vtkm::cont::ArrayHandle<vtkm::Float32>::WritePortalType depthPortal =
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this->GetDepthBuffer().WritePortal();
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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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vtkm::rendering::Canvas* CanvasOSMesa::NewCopy() const
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{
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return new vtkm::rendering::CanvasOSMesa(*this);
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}
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}
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} // namespace vtkm::rendering
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