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annotate OrthancStone/Sources/OpenGL/OpenGLProgram.cpp @ 1574:fb5e620430ae

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author Sebastien Jodogne <s.jodogne@gmail.com>
date Mon, 21 Sep 2020 18:29:53 +0200
parents 85e117739eca
children 4fb8fdf03314
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rev   line source
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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 "OpenGLProgram.h"
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23
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24 #include "OpenGLShader.h"
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25 #include "IOpenGLContext.h"
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26
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27 #include <OrthancException.h>
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28
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29 namespace OrthancStone
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30 {
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31 namespace OpenGL
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32 {
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33 OpenGLProgram::OpenGLProgram(OpenGL::IOpenGLContext& context) :
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34 context_(context)
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35 {
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36 program_ = glCreateProgram();
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37 ORTHANC_OPENGL_CHECK("glCreateProgram");
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38
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39 if (program_ == 0)
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40 {
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41 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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42 "Cannot create an OpenGL program");
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43 }
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44 }
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46
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47 OpenGLProgram::~OpenGLProgram()
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48 {
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49 try
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50 {
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51 if (!context_.IsContextLost())
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52 {
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53 ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("About to call glDeleteProgram");
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54 assert(program_ != 0);
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55 glDeleteProgram(program_);
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56 ORTHANC_OPENGL_CHECK("glDeleteProgram");
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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 ~OpenGLProgram: " << 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 ~OpenGLProgram: " << 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 ~OpenGLProgram: " << 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 ~OpenGLProgram";
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77 }
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78 }
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79
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80 void OpenGLProgram::Use()
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81 {
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82 //ORTHANC_OPENGL_TRACE_CURRENT_CONTEXT("About to call glUseProgram");
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83 glUseProgram(program_);
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84 ORTHANC_OPENGL_CHECK("glUseProgram");
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85 }
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86
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87 void OpenGLProgram::CompileShaders(const std::string& vertexCode,
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88 const std::string& fragmentCode)
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89 {
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90 assert(program_ != 0);
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91
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92 OpenGLShader vertexShader(GL_VERTEX_SHADER, vertexCode);
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93 OpenGLShader fragmentShader(GL_FRAGMENT_SHADER, fragmentCode);
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94
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95 glAttachShader(program_, vertexShader.Release());
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96 ORTHANC_OPENGL_CHECK("glAttachShader");
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97 glAttachShader(program_, fragmentShader.Release());
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98 ORTHANC_OPENGL_CHECK("glAttachShader");
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99 glLinkProgram(program_);
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100 ORTHANC_OPENGL_CHECK("glLinkProgram");
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101 glValidateProgram(program_);
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102 ORTHANC_OPENGL_CHECK("glValidateProgram");
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103 }
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104
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105 GLint OpenGLProgram::GetUniformLocation(const std::string& name)
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106 {
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107 GLint location = glGetUniformLocation(program_, name.c_str());
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108 ORTHANC_OPENGL_CHECK("glGetUniformLocation");
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109
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110 if (location == -1)
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111 {
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112 throw Orthanc::OrthancException(Orthanc::ErrorCode_InexistentItem,
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113 "Inexistent uniform variable in shader: " + name);
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114 }
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115 else
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116 {
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117 return location;
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118 }
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119 }
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120
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121
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122 GLint OpenGLProgram::GetAttributeLocation(const std::string& name)
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123 {
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124 GLint location = glGetAttribLocation(program_, name.c_str());
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125 ORTHANC_OPENGL_CHECK("glGetAttribLocation");
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126
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127 if (location == -1)
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128 {
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129 throw Orthanc::OrthancException(Orthanc::ErrorCode_InexistentItem,
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130 "Inexistent attribute in shader: " + name);
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131 }
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132 else
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133 {
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134 return location;
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135 }
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136 }
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137 }
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138 }