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annotate OrthancStone/Sources/OpenGL/ImageProcessingProgram.cpp @ 2064:4e31d76c7ecd deep-learning

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making ImageProcessingProgram compatible with 3D volumes
author Sebastien Jodogne <s.jodogne@gmail.com>
date Thu, 04 May 2023 11:06:19 +0200
parents 6ea5f40ea0e9
children cf3d85eb291c
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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 "ImageProcessingProgram.h"
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25
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26 #include "OpenGLFramebuffer.h"
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27
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28 #include <OrthancException.h>
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30
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31 static const unsigned int DIMENSIONS = 2; // Number of dimensions (we draw in 2D)
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32 static const unsigned int VERTICES = 6; // 2 triangles in 2D (each triangle has 3 vertices)
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33
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34
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35 static const float TRIANGLES[DIMENSIONS * VERTICES] = {
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36 // First triangle
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37 -1.0f, -1.0f,
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38 1.0f, -1.0f,
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39 -1.0f, 1.0f,
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40 // Second triangle
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41 -1.0f, 1.0f,
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42 1.0f, -1.0f,
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43 1.0f, 1.0f
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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 * "varying" indicates variables that are shader by the vertex shader
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49 * and the fragment shader. The reason for "v_position" is that
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50 * "a_position" (position in the target frame buffer) ranges from -1
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51 * to 1, whereas texture samplers range from 0 to 1.
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52 **/
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53 static const char* VERTEX_SHADER_2D =
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54 "in vec2 a_position; \n"
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55 "out vec2 v_position; \n"
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56 "void main() { \n"
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57 " v_position = (a_position + 1.0) / 2.0; \n"
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58 " gl_Position = vec4(a_position, 0, 1.0); \n"
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59 "} \n";
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60
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61
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62 /**
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63 * VERTEX_SHADER_3D allows to sample a 3D texture by introducing the
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64 * "u_z" uniform whose range is in [0,1] and that allows to scan a 3D
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65 * texture along its Z axis.
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66 **/
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67 static const char* VERTEX_SHADER_3D =
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68 "in vec2 a_position; \n"
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69 "out vec3 v_position; \n"
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70 "uniform float u_z; \n"
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71 "void main() { \n"
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72 " v_position = vec3((a_position + 1.0) / 2.0, u_z); \n"
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73 " gl_Position = vec4(a_position, u_z, 1.0); \n"
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74 "} \n";
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75
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76
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77 namespace OrthancStone
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78 {
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79 namespace OpenGL
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80 {
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81 void ImageProcessingProgram::SetupPosition()
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82 {
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83 glBindBuffer(GL_ARRAY_BUFFER, quad_vertexbuffer);
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84 glBufferData(GL_ARRAY_BUFFER, sizeof(float) * DIMENSIONS * VERTICES, TRIANGLES, GL_STATIC_DRAW);
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85 GLint positionLocation = program_.GetAttributeLocation("a_position");
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86 glVertexAttribPointer(positionLocation, 2, GL_FLOAT, GL_FALSE, 0, 0);
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87 glEnableVertexAttribArray(positionLocation);
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88 }
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89
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90
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91 ImageProcessingProgram::ImageProcessingProgram(IOpenGLContext& context,
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92 const std::string& fragmentShader,
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93 bool addUniformZ) :
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94 program_(context),
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95 quad_vertexbuffer(0)
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96 {
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97 if (context.IsContextLost())
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98 {
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99 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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100 "OpenGL context has been lost");
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101 }
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102
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103 context.MakeCurrent();
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104
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105 std::string version;
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106
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107 #if ORTHANC_ENABLE_WASM == 1
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108 /**
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109 * "#version 300 es" corresponds to:
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110 * - OpenGL ES version 3.0: https://registry.khronos.org/OpenGL-Refpages/es3.0/
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111 * - WebGL version 2.0
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112 * - GLSL ES version 3.00.6
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113 * - Based on version GLSL version 3.0
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114 *
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115 * Explanation for "highp":
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116 * https://emscripetn.org/docs/optimizing/Optimizing-WebGL.html
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117 * https://webglfundamentals.org/webgl/lessons/webgl-qna-when-to-choose-highp--mediump--lowp-in-shaders.html
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118 **/
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119 version = ("#version 300 es\n"
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120 "precision highp float;\n"
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121 "precision highp sampler2D;\n"
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122 "precision highp sampler2DArray;\n"
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123 "precision highp sampler3D;\n");
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124 #else
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125 /**
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126 * "#version 130" corresponds to:
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127 * - OpenGL version 3.0
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128 * - GLSL version 1.30.10
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129 **/
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130 version = "#version 130\n";
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131 #endif
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132
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133 std::string vertexShader;
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134
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135 if (addUniformZ)
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136 {
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137 vertexShader = version + VERTEX_SHADER_3D;
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138 }
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139 else
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140 {
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141 vertexShader = version + VERTEX_SHADER_2D;
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142 }
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143
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144 program_.CompileShaders(vertexShader, version + fragmentShader);
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145
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146 glGenBuffers(1, &quad_vertexbuffer);
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147 if (quad_vertexbuffer == 0)
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148 {
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149 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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150 "Cannot create OpenGL buffer");
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151 }
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152 }
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153
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154
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155 ImageProcessingProgram::~ImageProcessingProgram()
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156 {
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157 glDeleteBuffers(1, &quad_vertexbuffer);
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158 }
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159
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160
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161 void ImageProcessingProgram::Use(OpenGLTexture& target,
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162 OpenGLFramebuffer& framebuffer,
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163 bool checkStatus)
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164 {
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165 program_.Use(checkStatus);
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166 framebuffer.SetTarget(target);
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167 SetupPosition();
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168 }
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169
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170
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171 void ImageProcessingProgram::Use(OpenGLTextureArray& target,
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172 unsigned int targetLayer,
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173 OpenGLFramebuffer& framebuffer,
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174 bool checkStatus)
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175 {
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176 program_.Use(checkStatus);
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177 framebuffer.SetTarget(target, targetLayer);
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178 SetupPosition();
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179 }
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180
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181
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182 void ImageProcessingProgram::Render()
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183 {
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184 glClearColor(0.0, 0.0, 0.0, 1.0);
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185 glClear(GL_COLOR_BUFFER_BIT);
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186
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187 #if 1
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188 glDrawArrays(GL_TRIANGLES, 0, VERTICES);
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189 #else
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190 // Simpler, but not available in WebGL
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191 glBegin(GL_QUADS);
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192 glVertex2f(-1, 1); // vertex 1
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193 glVertex2f(-1, -1); // vertex 2
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194 glVertex2f( 1, -1); // vertex 3
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195 glVertex2f( 1, 1); // vertex 4
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196 glEnd();
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197 #endif
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198
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199 ORTHANC_OPENGL_CHECK("glDrawArrays()");
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200 }
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201 }
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202 }