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annotate Framework/OpenGL/OpenGLTexture.cpp @ 579:fadacfbf5538

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OpenGL programs and textures
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 19 Apr 2019 16:06:45 +0200
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children 97926984d5d0
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2019 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #include "OpenGLTexture.h"
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23
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24 #include <Core/OrthancException.h>
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25
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26 namespace OrthancStone
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27 {
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28 namespace OpenGL
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29 {
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30 OpenGLTexture::OpenGLTexture() :
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31 width_(0),
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32 height_(0)
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33 {
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34 // Generate a texture object
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35 glGenTextures(1, &texture_);
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36 if (texture_ == 0)
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37 {
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38 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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39 "Cannot create an OpenGL program");
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40 }
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41 }
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42
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43
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44 OpenGLTexture::~OpenGLTexture()
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45 {
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46 assert(texture_ != 0);
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47 glDeleteTextures(1, &texture_);
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48 }
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49
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50
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51 void OpenGLTexture::Load(const Orthanc::ImageAccessor& image,
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52 bool isLinearInterpolation)
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53 {
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54 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Disable byte-alignment restriction
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55
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56 if (image.GetPitch() != image.GetBytesPerPixel() * image.GetWidth())
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57 {
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58 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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59 "Unsupported non-zero padding");
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60 }
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61
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62 // Bind it
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63 glActiveTexture(GL_TEXTURE0);
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64 glBindTexture(GL_TEXTURE_2D, texture_);
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65
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66 GLenum sourceFormat, internalFormat;
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67
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68 switch (image.GetFormat())
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69 {
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70 case Orthanc::PixelFormat_Grayscale8:
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71 sourceFormat = GL_RED;
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72 internalFormat = GL_RED;
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73 break;
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74
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75 case Orthanc::PixelFormat_RGB24:
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76 sourceFormat = GL_RGB;
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77 internalFormat = GL_RGBA;
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78 break;
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79
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80 case Orthanc::PixelFormat_RGBA32:
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81 sourceFormat = GL_RGBA;
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82 internalFormat = GL_RGBA;
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83 break;
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84
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85 default:
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86 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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87 "No support for this format in OpenGL textures: " +
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88 std::string(EnumerationToString(image.GetFormat())));
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89 }
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90
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91 width_ = image.GetWidth();
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92 height_ = image.GetHeight();
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93
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94 GLint interpolation = (isLinearInterpolation ? GL_LINEAR : GL_NEAREST);
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95
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96 // Load the texture from the image buffer
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97 glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, image.GetWidth(), image.GetHeight(),
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98 0, sourceFormat, GL_UNSIGNED_BYTE, image.GetBuffer());
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99 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, interpolation);
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100 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, interpolation);
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101 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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102 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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103 }
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104
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105
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106 void OpenGLTexture::Bind(GLint location)
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107 {
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108 glActiveTexture(GL_TEXTURE0);
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109 glBindTexture(GL_TEXTURE_2D, texture_);
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110 glUniform1i(location, 0 /* texture unit */);
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111 }
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112 }
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113 }