--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Framework/OpenGL/OpenGLShader.cpp	Fri Apr 19 15:57:46 2019 +0200
@@ -0,0 +1,114 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2019 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Affero General Public License
+ * as published by the Free Software Foundation, either version 3 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Affero General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+
+#include "OpenGLShader.h"
+
+#include <Core/OrthancException.h>
+
+namespace OrthancStone
+{
+  namespace OpenGL
+  {
+    static GLuint CompileShader(GLenum type,
+                                const std::string& source) 
+    {
+      // Create shader object
+      const GLchar* sourceString[1];
+      GLint sourceStringLengths[1];
+
+      sourceString[0] = source.c_str();
+      sourceStringLengths[0] = source.length();
+      GLuint shader = glCreateShader(type);
+
+      if (shader == 0)
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+                                        "Cannot create an OpenGL shader");
+      }
+      else
+      {
+        // Assign and compile the source to the shader object
+        glShaderSource(shader, 1, sourceString, sourceStringLengths);
+        glCompileShader(shader);
+
+        // Check if there were errors
+        int infoLen = 0;
+        glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &infoLen);
+
+        if (infoLen > 1) 
+        {
+          char infoLog[infoLen + 1];
+          glGetShaderInfoLog(shader, infoLen, NULL, infoLog);
+          glDeleteShader(shader);
+
+          throw Orthanc::OrthancException(Orthanc::ErrorCode_InternalError,
+                                          "Error while creating an OpenGL shader: " + std::string(infoLog));
+        }
+        else
+        {
+          return shader;
+        }
+      }
+    }
+
+
+    OpenGLShader::OpenGLShader(GLenum type,
+                               const std::string& source)
+    {
+      shader_ = CompileShader(type, source);
+      isValid_ = true;
+    }
+
+    
+    OpenGLShader::OpenGLShader(GLenum type,
+                               Orthanc::EmbeddedResources::FileResourceId resource)
+    {
+      std::string content;
+      Orthanc::EmbeddedResources::GetFileResource(content, resource);
+
+      shader_ = CompileShader(type, content);
+      isValid_ = true;
+    }
+
+    
+    OpenGLShader::~OpenGLShader()
+    {
+      if (isValid_)
+      {
+        glDeleteShader(shader_);
+      }
+    }
+
+
+    GLuint OpenGLShader::Release()
+    {
+      if (isValid_)
+      {
+        isValid_ = false;
+        return shader_;
+      }
+      else
+      {
+        throw Orthanc::OrthancException(Orthanc::ErrorCode_BadSequenceOfCalls);
+      }
+    }
+  }
+}