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annotate OrthancStone/Sources/OpenGL/OpenGLTexture.cpp @ 2033:23b0a42eea85 deep-learning

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added support for floating-point images in OpenGLTexture
author Sebastien Jodogne <s.jodogne@gmail.com>
date Sun, 22 Jan 2023 10:48:22 +0100
parents d10bab7cc396
children 4b24b7533346
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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) 2017-2022 Osimis S.A., Belgium
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6 * Copyright (C) 2021-2022 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 <Images/Image.h>
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28 #include <Logging.h>
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29 #include <OrthancException.h>
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30
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31 namespace OrthancStone
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32 {
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33 namespace OpenGL
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34 {
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35 OpenGLTexture::OpenGLTexture(OpenGL::IOpenGLContext& context) :
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36 texture_(0),
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37 width_(0),
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38 height_(0),
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39 context_(context)
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40 {
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41 if (!context_.IsContextLost())
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42 {
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43 // Generate a texture object
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44 glGenTextures(1, &texture_);
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45 if (texture_ == 0)
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46 {
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47 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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48 "Cannot create an OpenGL texture");
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49 }
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50 }
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51 }
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52
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53 OpenGLTexture::~OpenGLTexture()
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54 {
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55 try
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56 {
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57 if (!context_.IsContextLost())
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58 {
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59 assert(texture_ != 0);
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60 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("About to call glDeleteTextures");
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61 glDeleteTextures(1, &texture_);
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62 }
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63 }
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64 catch (const Orthanc::OrthancException& e)
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65 {
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66 if (e.HasDetails())
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67 {
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68 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What() << " Details: " << e.GetDetails();
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69 }
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70 else
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71 {
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72 LOG(ERROR) << "OrthancException in ~OpenGLTexture: " << e.What();
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73 }
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74 }
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75 catch (const std::exception& e)
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76 {
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77 LOG(ERROR) << "std::exception in ~OpenGLTexture: " << e.what();
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78 }
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79 catch (...)
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80 {
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81 LOG(ERROR) << "Unknown exception in ~OpenGLTexture";
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82 }
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83 }
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84
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85 void OpenGLTexture::Load(const Orthanc::ImageAccessor& image,
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86 bool isLinearInterpolation)
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87 {
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88 if (!context_.IsContextLost())
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89 {
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90 glPixelStorei(GL_UNPACK_ALIGNMENT, 1); // Disable byte-alignment restriction
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91
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92 if (image.GetPitch() != image.GetBytesPerPixel() * image.GetWidth())
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93 {
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94 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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95 "Pitch is not the same as the row size");
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96 }
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97
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98 // Bind it
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99 glActiveTexture(GL_TEXTURE0);
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100 glBindTexture(GL_TEXTURE_2D, texture_);
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101
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102 GLenum sourceFormat, internalFormat, pixelType;
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103
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104 switch (image.GetFormat())
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105 {
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106 case Orthanc::PixelFormat_Grayscale8:
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107 sourceFormat = GL_RED;
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108 internalFormat = GL_RED;
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109 pixelType = GL_UNSIGNED_BYTE;
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110 break;
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111
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112 case Orthanc::PixelFormat_RGB24:
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113 sourceFormat = GL_RGB;
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114 internalFormat = GL_RGB;
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115 pixelType = GL_UNSIGNED_BYTE;
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116 break;
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117
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118 case Orthanc::PixelFormat_RGBA32:
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119 sourceFormat = GL_RGBA;
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120 internalFormat = GL_RGBA;
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121 pixelType = GL_UNSIGNED_BYTE;
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122 break;
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123
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124 case Orthanc::PixelFormat_Float32:
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125 sourceFormat = GL_RED;
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126 internalFormat = GL_R32F; // Don't use "GL_RED" here, as it clamps to [0,1]
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127 pixelType = GL_FLOAT;
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128 break;
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129
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130 default:
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131 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented,
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132 "No support for this format in OpenGL textures: " +
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133 std::string(EnumerationToString(image.GetFormat())));
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134 }
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135
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136 width_ = image.GetWidth();
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137 height_ = image.GetHeight();
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138
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139 GLint interpolation = (isLinearInterpolation ? GL_LINEAR : GL_NEAREST);
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140
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141 // Load the texture from the image buffer
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142 glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, image.GetWidth(), image.GetHeight(),
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143 0, sourceFormat, pixelType, image.GetConstBuffer());
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144 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, interpolation);
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145 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, interpolation);
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146 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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147 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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148 }
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149 }
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150
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151
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152 void OpenGLTexture::Bind(GLint location)
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153 {
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154 glActiveTexture(GL_TEXTURE0);
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155 glBindTexture(GL_TEXTURE_2D, texture_);
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156 glUniform1i(location, 0 /* texture unit */);
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157 }
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158
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159
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160 Orthanc::ImageAccessor* OpenGLTexture::Download(Orthanc::PixelFormat format)
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161 {
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162 if (context_.IsContextLost())
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163 {
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164 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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165 "OpenGL context is lost");
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166 }
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167
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168 std::unique_ptr<Orthanc::ImageAccessor> target(new Orthanc::Image(format, width_, height_, true));
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169 assert(target->GetPitch() == width_ * Orthanc::GetBytesPerPixel(format));
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170
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171 glBindTexture(GL_TEXTURE_2D, texture_);
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172
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173 switch (format)
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174 {
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175 case Orthanc::PixelFormat_Grayscale8:
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176 glGetTexImage(GL_TEXTURE_2D, 0 /* base level */, GL_RED, GL_UNSIGNED_BYTE, target->GetBuffer());
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177 break;
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178
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179 case Orthanc::PixelFormat_RGB24:
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180 glGetTexImage(GL_TEXTURE_2D, 0 /* base level */, GL_RGB, GL_UNSIGNED_BYTE, target->GetBuffer());
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181 break;
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182
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183 case Orthanc::PixelFormat_RGBA32:
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184 glGetTexImage(GL_TEXTURE_2D, 0 /* base level */, GL_RGBA, GL_UNSIGNED_BYTE, target->GetBuffer());
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185 break;
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186
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187 case Orthanc::PixelFormat_Float32:
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188 glGetTexImage(GL_TEXTURE_2D, 0 /* base level */, GL_RED, GL_FLOAT, target->GetBuffer());
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189 break;
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190
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191 default:
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192 throw Orthanc::OrthancException(Orthanc::ErrorCode_NotImplemented);
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193 }
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194
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195 return target.release();
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196 }
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197 }
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198 }