5dd346007b
clang-format BinPack settings have been disabled to make sure that the VTK-m style guideline is obeyed.
189 lines
4.8 KiB
C++
189 lines
4.8 KiB
C++
//=============================================================================
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//
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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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// 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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// 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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//=============================================================================
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#include <vtkm/rendering/TextureGL.h>
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#include <vtkm/rendering/internal/OpenGLHeaders.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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struct TextureGL::InternalsType
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{
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GLuint Id;
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int Dimension;
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bool MIPMap;
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bool Linear2D;
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bool LinearMIP;
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VTKM_CONT
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InternalsType()
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: Id(0)
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, Dimension(0)
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, MIPMap(false)
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, Linear2D(true)
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, LinearMIP(true)
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{
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}
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VTKM_CONT
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~InternalsType()
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{
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if (this->Id != 0)
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{
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glDeleteTextures(1, &this->Id);
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}
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}
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};
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TextureGL::TextureGL()
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: Internals(new InternalsType)
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{
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}
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TextureGL::~TextureGL()
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{
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}
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bool TextureGL::Valid() const
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{
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return (this->Internals->Id != 0);
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}
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void TextureGL::Enable() const
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{
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if (!this->Valid())
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{
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return;
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}
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if (this->Internals->Dimension == 1)
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{
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// no this->Internals->MIPMapping for 1D (at the moment)
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glBindTexture(GL_TEXTURE_1D, this->Internals->Id);
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glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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if (this->Internals->Linear2D)
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{
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glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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}
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else
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{
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glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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}
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glEnable(GL_TEXTURE_1D);
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}
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else if (this->Internals->Dimension == 2)
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{
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glBindTexture(GL_TEXTURE_2D, this->Internals->Id);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
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if (this->Internals->Linear2D)
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{
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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if (!this->Internals->MIPMap)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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else if (this->Internals->LinearMIP)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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else
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_NEAREST);
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}
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else
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{
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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if (!this->Internals->MIPMap)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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else if (this->Internals->LinearMIP)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
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else
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
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}
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glEnable(GL_TEXTURE_2D);
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}
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else
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{
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// Fail silently for invalid dimension.
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}
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}
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void TextureGL::Disable() const
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{
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if (this->Internals->Dimension == 1)
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{
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glDisable(GL_TEXTURE_1D);
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}
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else if (this->Internals->Dimension == 2)
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{
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glDisable(GL_TEXTURE_2D);
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}
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else
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{
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// Fail silently for invalid dimension
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}
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}
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void TextureGL::CreateAlphaFromRGBA(vtkm::Id width,
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vtkm::Id height,
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const std::vector<unsigned char>& rgba)
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{
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this->Internals->Dimension = 2;
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std::vector<unsigned char> alpha(rgba.size() / 4);
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VTKM_ASSERT(width * height == static_cast<vtkm::Id>(alpha.size()));
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for (std::size_t i = 0; i < alpha.size(); i++)
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{
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alpha[i] = rgba[i * 4 + 3];
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}
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if (this->Internals->Id == 0)
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{
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glGenTextures(1, &this->Internals->Id);
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}
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if (this->Internals->Dimension == 1)
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{
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glBindTexture(GL_TEXTURE_1D, this->Internals->Id);
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}
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else if (this->Internals->Dimension == 2)
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{
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glBindTexture(GL_TEXTURE_2D, this->Internals->Id);
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//#define HW_MIPMAPS
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#ifdef HW_MIPMAPS
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mpimap = true;
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glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
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#endif
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glTexImage2D(GL_TEXTURE_2D,
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0,
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GL_ALPHA,
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static_cast<GLsizei>(width),
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static_cast<GLsizei>(height),
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0,
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GL_ALPHA,
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GL_UNSIGNED_BYTE,
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(void*)(&(alpha[0])));
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}
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}
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}
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} // namespace vtkm::rendering
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