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annotate Framework/OpenGL/OpenGLShader.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
parents 21fd70df3fc9
children 434ceeb0bcab
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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 "OpenGLShader.h"
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23
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24 #include <Core/OrthancException.h>
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25
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26 namespace OrthancStone
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27 {
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28 namespace OpenGL
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29 {
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30 static GLuint CompileShader(GLenum type,
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31 const std::string& source)
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32 {
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33 // Create shader object
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34 const GLchar* sourceString[1];
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35 GLint sourceStringLengths[1];
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36
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37 sourceString[0] = source.c_str();
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38 sourceStringLengths[0] = source.length();
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39 GLuint shader = glCreateShader(type);
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40
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41 if (shader == 0)
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42 {
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43 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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44 "Cannot create an OpenGL shader");
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45 }
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46 else
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47 {
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48 // Assign and compile the source to the shader object
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49 glShaderSource(shader, 1, sourceString, sourceStringLengths);
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50 glCompileShader(shader);
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51
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52 // Check if there were errors
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53 int infoLen = 0;
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54 glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
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55
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56 if (infoLen > 1)
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57 {
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58 char infoLog[infoLen + 1];
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59 glGetShaderInfoLog(shader, infoLen, NULL, infoLog);
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60 glDeleteShader(shader);
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61
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62 throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
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63 "Error while creating an OpenGL shader: " + std::string(infoLog));
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64 }
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65 else
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66 {
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67 return shader;
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68 }
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69 }
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70 }
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71
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72
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73 OpenGLShader::OpenGLShader(GLenum type,
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74 const std::string& source)
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75 {
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76 shader_ = CompileShader(type, source);
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77 isValid_ = true;
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78 }
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79
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80
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81 OpenGLShader::~OpenGLShader()
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82 {
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83 if (isValid_)
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84 {
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85 glDeleteShader(shader_);
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86 }
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87 }
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88
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89
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90 GLuint OpenGLShader::Release()
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91 {
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92 if (isValid_)
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93 {
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94 isValid_ = false;
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95 return shader_;
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96 }
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97 else
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98 {
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99 throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
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100 }
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101 }
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102 }
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103 }