text: /*********************************************************************************
   *
   * Inviwo - Interactive Visualization Workshop
   *
   * Copyright (c) 2016-2019 Inviwo Foundation
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice, this
   * list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   * this list of conditions and the following disclaimer in the documentation
   * and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   *
   *********************************************************************************/
  
  #ifndef IVW_SHAREDOPENGLRESOURCES_H
  #define IVW_SHAREDOPENGLRESOURCES_H
  
  #include <modules/opengl/openglmoduledefine.h>
  #include <inviwo/core/common/inviwo.h>
  #include <inviwo/core/util/singleton.h>
  #include <inviwo/core/datastructures/geometry/mesh.h>
  
  namespace inviwo {
  
  class Mesh;
  class MeshGL;
  class Shader;
  
  /**
   * \class SharedOpenGLResources
   */
  class IVW_MODULE_OPENGL_API SharedOpenGLResources : public Singleton<SharedOpenGLResources> {
  public:
      SharedOpenGLResources() = default;
      virtual ~SharedOpenGLResources() = default;
  
      const MeshGL* imagePlaneRect();
  
      Shader* getTextureShader();
      Shader* getNoiseShader();
      Shader* getImageCopyShader(size_t colorLayers);
  
      void reset();
  
  private:
      std::unique_ptr<Mesh> planeRectMesh_;
      const MeshGL* planeRectMeshGl_ = nullptr;
  
      std::unique_ptr<Shader> textureShader_;
      std::unique_ptr<Shader> noiseShader_;
      std::unordered_map<std::size_t, std::unique_ptr<Shader>> imgCopyShaders_;
  
      friend Singleton<SharedOpenGLResources>;
      static SharedOpenGLResources* instance_;
  };
  
  }  // namespace inviwo
  
  #endif  // IVW_SHAREDOPENGLRESOURCES_H
  