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annotate Framework/OpenGL/OpenGLProgram.cpp @ 579:fadacfbf5538

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OpenGL programs and textures
author Sebastien Jodogne <s.jodogne@gmail.com>
date Fri, 19 Apr 2019 16:06:45 +0200
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children 1091b2adeb5a
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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) 2017-2019 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
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26 #include <Core/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()
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34 {
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35 program_ = glCreateProgram();
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36 if (program_ == 0)
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37 {
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38 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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39 "Cannot create an OpenGL program");
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40 }
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41 }
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42
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43
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44 OpenGLProgram::~OpenGLProgram()
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45 {
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46 assert(program_ != 0);
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47 glDeleteProgram(program_);
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48 }
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49
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50
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51 void OpenGLProgram::Use()
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52 {
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53 glUseProgram(program_);
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54 }
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56
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57 void OpenGLProgram::CompileShaders(const std::string& vertexCode,
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58 const std::string& fragmentCode)
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59 {
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60 assert(program_ != 0);
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61
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62 OpenGLShader vertexShader(GL_VERTEX_SHADER, vertexCode);
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63 OpenGLShader fragmentShader(GL_FRAGMENT_SHADER, fragmentCode);
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64
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65 glAttachShader(program_, vertexShader.Release());
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66 glAttachShader(program_, fragmentShader.Release());
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67 glLinkProgram(program_);
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68 glValidateProgram(program_);
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69 }
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70
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71
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72 GLint OpenGLProgram::GetUniformLocation(const std::string& name)
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73 {
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74 GLint location = glGetUniformLocation(program_, name.c_str());
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75
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76 if (location == -1)
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77 {
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78 throw Orthanc::OrthancException(Orthanc::ErrorCode_InexistentItem,
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79 "Inexistent uniform variable in shader: " + name);
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80 }
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81 else
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82 {
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83 return location;
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84 }
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85 }
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86
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87
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88 GLint OpenGLProgram::GetAttributeLocation(const std::string& name)
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89 {
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90 GLint location = glGetAttribLocation(program_, name.c_str());
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91
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92 if (location == -1)
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93 {
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94 throw Orthanc::OrthancException(Orthanc::ErrorCode_InexistentItem,
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95 "Inexistent attribute in shader: " + name);
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96 }
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97 else
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98 {
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99 return location;
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100 }
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101 }
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102 }
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103 }