text: /*********************************************************************************
   *
   * Inviwo - Interactive Visualization Workshop
   *
   * Copyright (c) 2013-2018 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_TEXTUREUNIT_H
  #define IVW_TEXTUREUNIT_H
  
  #include <modules/opengl/openglmoduledefine.h>
  #include <modules/opengl/inviwoopengl.h>
  
  #include <vector>
  
  namespace inviwo {
  
  class IVW_MODULE_OPENGL_API TextureUnit {
  public:
      TextureUnit();
      ~TextureUnit();
      
      TextureUnit(TextureUnit& rhs) = delete;
      TextureUnit& operator=(const TextureUnit& that) = delete;
      
      TextureUnit(TextureUnit&& rhs);
      TextureUnit& operator=(TextureUnit&& that);
      
      // These are called from OpenGLCapabilities retrieveStaticInfo/destructor.
      static void initialize(int numUnits);
      static void deinitialize();
  
      inline GLint getEnum() const { return unitEnum_; }
      inline GLint getUnitNumber() const { return unitNumber_; }
  
      inline void activate() const { glActiveTexture(unitEnum_); }
      inline static void setZeroUnit() { glActiveTexture(GL_TEXTURE0); }
  
  private:
      static std::vector<bool> textureUnits_;
  
      GLint unitEnum_;
      GLint unitNumber_;
  };
  
  class IVW_MODULE_OPENGL_API TextureUnitContainer {
  public:
      TextureUnitContainer(size_t i = 0);
      TextureUnitContainer(const TextureUnitContainer&) = delete;
      TextureUnitContainer& operator=(const TextureUnitContainer&) = delete;
      TextureUnitContainer(TextureUnitContainer&& rhs);
      TextureUnitContainer& operator=(TextureUnitContainer&& that);
      ~TextureUnitContainer() = default;
      
      void push_back(TextureUnit&& unit);
      
      TextureUnit& operator[](size_t i);
      size_t size() const;
      
  private:
      std::vector<TextureUnit> units_;
  };
  
  
  } // namespace
  
  #endif // IVW_TEXTUREUNIT_H
  