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annotate OrthancStone/Sources/OpenGL/OpenGLTexture.cpp @ 1870:3889ae96d2e9

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added copyright UCLouvain
author Sebastien Jodogne <s.jodogne@gmail.com>
date Tue, 11 Jan 2022 11:04:09 +0100
parents 9ac2a65d4172
children 7053b8a0aaec
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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) 2017-2021 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2021 Sebastien Jodogne, ICTEAM UCLouvain, Belgium
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7 *
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8 * This program is free software: you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public License
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10 * as published by the Free Software Foundation, either version 3 of
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11 * the License, or (at your option) any later version.
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12 *
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13 * This program is distributed in the hope that it will be useful, but
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14 * WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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16 * Lesser General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU Lesser General Public
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19 * License along with this program. If not, see
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20 * <http://www.gnu.org/licenses/>.
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21 **/
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22
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23
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24 #include "OpenGLTexture.h"
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25 #include "IOpenGLContext.h"
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26
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27 #include <Logging.h>
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28 #include <OrthancException.h>
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29
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30 namespace OrthancStone
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31 {
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32 namespace OpenGL
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33 {
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34 OpenGLTexture::OpenGLTexture(OpenGL::IOpenGLContext& context)
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35 : width_(0)
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36 , height_(0)
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37 , context_(context)
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38 {
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39 if (!context_.IsContextLost())
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40 {
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41 // Generate a texture object
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42 glGenTextures(1, &texture_);
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43 if (texture_ == 0)
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44 {
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45 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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46 "Cannot create an OpenGL program");
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47 }
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48 }
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49 }
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50
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51 OpenGLTexture::~OpenGLTexture()
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52 {
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53 try
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54 {
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55 if (!context_.IsContextLost())
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56 {
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57 assert(texture_ != 0);
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58 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("About to call glDeleteTextures");
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59 glDeleteTextures(1, &texture_);
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60 }
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61 }
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62 catch (const Orthanc::OrthancException& e)
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63 {
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64 if (e.HasDetails())
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65 {
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66 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What() << " Details: " << e.GetDetails();
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67 }
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68 else
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69 {
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70 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What();
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71 }
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72 }
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73 catch (const std::exception& e)
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74 {
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75 LOG(ERROR) << "std::exception in ~OpenGLTexture: " << e.what();
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76 }
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77 catch (...)
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78 {
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79 LOG(ERROR) << "Unknown exception in ~OpenGLTexture";
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80 }
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81 }
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82
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83 void OpenGLTexture::Load(const Orthanc::ImageAccessor& image,
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84 bool isLinearInterpolation)
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85 {
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86 if (!context_.IsContextLost())
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87 {
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88 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Disable byte-alignment restriction
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89
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90 if (image.GetPitch() != image.GetBytesPerPixel() * image.GetWidth())
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91 {
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92 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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93 "Unsupported non-zero padding");
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94 }
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95
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96 // Bind it
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97 glActiveTexture(GL_TEXTURE0);
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98 glBindTexture(GL_TEXTURE_2D, texture_);
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99
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100 GLenum sourceFormat, internalFormat;
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101
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102 switch (image.GetFormat())
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103 {
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104 case Orthanc::PixelFormat_Grayscale8:
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105 sourceFormat = GL_RED;
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106 internalFormat = GL_RED;
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107 break;
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108
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109 case Orthanc::PixelFormat_RGB24:
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110 sourceFormat = GL_RGB;
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111 internalFormat = GL_RGB;
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112 break;
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113
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114 case Orthanc::PixelFormat_RGBA32:
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115 sourceFormat = GL_RGBA;
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116 internalFormat = GL_RGBA;
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117 break;
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118
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119 default:
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120 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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121 "No support for this format in OpenGL textures: " +
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122 std::string(EnumerationToString(image.GetFormat())));
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123 }
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124
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125 width_ = image.GetWidth();
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126 height_ = image.GetHeight();
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127
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128 GLint interpolation = (isLinearInterpolation ? GL_LINEAR : GL_NEAREST);
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129
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130 // Load the texture from the image buffer
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131 glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, image.GetWidth(), image.GetHeight(),
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132 0, sourceFormat, GL_UNSIGNED_BYTE, image.GetConstBuffer());
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133 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, interpolation);
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134 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, interpolation);
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135 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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136 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
1091b2adeb5a Fixed animation frame stopping when returning false + big work on the OpenGL
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137 }
579
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138 }
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139
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140
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141 void OpenGLTexture::Bind(GLint location)
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142 {
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143 glActiveTexture(GL_TEXTURE0);
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144 glBindTexture(GL_TEXTURE_2D, texture_);
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145 glUniform1i(location, 0 /* texture unit */);
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146 }
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147 }
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148 }