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annotate OrthancStone/Sources/OpenGL/OpenGLTexture.cpp @ 1534:0443d04416d9

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don't discard the windowing altered by mouse
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 07 Aug 2020 21:48:43 +0200
parents 244ad1e4e76a
children e731e62692a9
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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) 2017-2020 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 #include "IOpenGLContext.h"
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24
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25 #include <OrthancException.h>
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26
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27 namespace OrthancStone
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28 {
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29 namespace OpenGL
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30 {
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31 OpenGLTexture::OpenGLTexture(OpenGL::IOpenGLContext& context)
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32 : width_(0)
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33 , height_(0)
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34 , context_(context)
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35 {
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36 if (!context_.IsContextLost())
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37 {
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38 // Generate a texture object
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39 glGenTextures(1, &texture_);
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40 if (texture_ == 0)
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41 {
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42 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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43 "Cannot create an OpenGL program");
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44 }
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45 }
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46 }
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47
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48 OpenGLTexture::~OpenGLTexture()
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49 {
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50 try
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51 {
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52 if (!context_.IsContextLost())
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53 {
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54 assert(texture_ != 0);
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55 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("About to call glDeleteTextures");
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56 glDeleteTextures(1, &texture_);
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57 }
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58 }
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59 catch (const Orthanc::OrthancException& e)
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60 {
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61 if (e.HasDetails())
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62 {
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63 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What() << " Details: " << e.GetDetails();
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64 }
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65 else
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66 {
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67 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What();
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68 }
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69 }
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70 catch (const std::exception& e)
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71 {
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72 LOG(ERROR) << "std::exception in ~OpenGLTexture: " << e.what();
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73 }
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74 catch (...)
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75 {
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76 LOG(ERROR) << "Unknown exception in ~OpenGLTexture";
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77 }
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78 }
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79
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80 void OpenGLTexture::Load(const Orthanc::ImageAccessor& image,
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81 bool isLinearInterpolation)
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82 {
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83 if (!context_.IsContextLost())
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84 {
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85 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Disable byte-alignment restriction
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86
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87 if (image.GetPitch() != image.GetBytesPerPixel() * image.GetWidth())
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88 {
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89 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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90 "Unsupported non-zero padding");
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91 }
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92
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93 // Bind it
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94 glActiveTexture(GL_TEXTURE0);
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95 glBindTexture(GL_TEXTURE_2D, texture_);
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96
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97 GLenum sourceFormat, internalFormat;
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98
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99 switch (image.GetFormat())
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100 {
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101 case Orthanc::PixelFormat_Grayscale8:
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102 sourceFormat = GL_RED;
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103 internalFormat = GL_RED;
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104 break;
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105
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106 case Orthanc::PixelFormat_RGB24:
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107 sourceFormat = GL_RGB;
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108 internalFormat = GL_RGB;
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109 break;
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110
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111 case Orthanc::PixelFormat_RGBA32:
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112 sourceFormat = GL_RGBA;
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113 internalFormat = GL_RGBA;
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114 break;
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115
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116 default:
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117 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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118 "No support for this format in OpenGL textures: " +
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119 std::string(EnumerationToString(image.GetFormat())));
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120 }
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121
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122 width_ = image.GetWidth();
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123 height_ = image.GetHeight();
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124
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125 GLint interpolation = (isLinearInterpolation ? GL_LINEAR : GL_NEAREST);
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126
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127 // Load the texture from the image buffer
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128 glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, image.GetWidth(), image.GetHeight(),
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129 0, sourceFormat, GL_UNSIGNED_BYTE, image.GetBuffer());
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130 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, interpolation);
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131 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, interpolation);
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132 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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133 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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134 }
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135 }
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136
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137
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138 void OpenGLTexture::Bind(GLint location)
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139 {
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140 glActiveTexture(GL_TEXTURE0);
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141 glBindTexture(GL_TEXTURE_2D, texture_);
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142 glUniform1i(location, 0 /* texture unit */);
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143 }
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144 }
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145 }