text: #ifndef Magnum_GL_Implementation_FramebufferState_h
  #define Magnum_GL_Implementation_FramebufferState_h
  /*
      This file is part of Magnum.
  
      Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018
                Vladimír Vondruš <mosra@centrum.cz>
  
      Permission is hereby granted, free of charge, to any person obtaining a
      copy of this software and associated documentation files (the "Software"),
      to deal in the Software without restriction, including without limitation
      the rights to use, copy, modify, merge, publish, distribute, sublicense,
      and/or sell copies of the Software, and to permit persons to whom the
      Software is furnished to do so, subject to the following conditions:
  
      The above copyright notice and this permission notice shall be included
      in all copies or substantial portions of the Software.
  
      THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      DEALINGS IN THE SOFTWARE.
  */
  
  #include <string>
  #include <vector>
  
  #include "Magnum/GL/Framebuffer.h"
  
  #ifdef _MSC_VER
  /* Otherwise the member function pointers will have different size based on
     whether the header was included or not. CAUSES SERIOUS MEMORY CORRUPTION AND
     IS NOT CAUGHT BY ANY WARNING WHATSOEVER! AARGH! */
  #include "Magnum/GL/Renderbuffer.h"
  #endif
  
  namespace Magnum { namespace GL { namespace Implementation {
  
  struct FramebufferState {
      constexpr static const Range2Di DisengagedViewport{{}, {-1, -1}};
  
      explicit FramebufferState(Context& context, std::vector<std::string>& extensions);
  
      void reset();
  
      #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
      void(*blitImplementation)(AbstractFramebuffer&, AbstractFramebuffer&, const Range2Di&, const Range2Di&, FramebufferBlitMask, FramebufferBlitFilter);
      #endif
      GLenum(AbstractFramebuffer::*checkStatusImplementation)(FramebufferTarget);
  
      #ifndef MAGNUM_TARGET_GLES2
      void(AbstractFramebuffer::*clearIImplementation)(GLenum, GLint, const GLint*);
      void(AbstractFramebuffer::*clearUIImplementation)(GLenum, GLint, const GLuint*);
      void(AbstractFramebuffer::*clearFImplementation)(GLenum, GLint, const GLfloat*);
      void(AbstractFramebuffer::*clearFIImplementation)(GLenum, GLfloat, GLint);
      #endif
  
      void(AbstractFramebuffer::*drawBuffersImplementation)(GLsizei, const GLenum*);
      #ifndef MAGNUM_TARGET_GLES
      void(AbstractFramebuffer::*drawBufferImplementation)(GLenum);
      #endif
      #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
      void(AbstractFramebuffer::*readBufferImplementation)(GLenum);
      #endif
      #ifndef MAGNUM_TARGET_GLES
      void(*copySub1DImplementation)(const Range2Di&, AbstractTexture&, Int, Int);
      #endif
      void(*copySub2DImplementation)(const Range2Di&, AbstractTexture&, GLenum, Int, const Vector2i&);
      void(*copySubCubeMapImplementation)(const Range2Di&, AbstractTexture&, GLenum, Int, const Vector2i&);
      #if !(defined(MAGNUM_TARGET_GLES2) && defined(MAGNUM_TARGET_WEBGL))
      void(*copySub3DImplementation)(const Range2Di&, AbstractTexture&, Int, const Vector3i&);
      #endif
      #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
      void(AbstractFramebuffer::*invalidateImplementation)(GLsizei, const GLenum*);
      #endif
      #ifndef MAGNUM_TARGET_GLES2
      void(AbstractFramebuffer::*invalidateSubImplementation)(GLsizei, const GLenum*, const Range2Di&);
      #endif
      #if defined(MAGNUM_TARGET_GLES2) && !defined(MAGNUM_TARGET_WEBGL)
      void(AbstractFramebuffer::*bindImplementation)(FramebufferTarget);
      FramebufferTarget(AbstractFramebuffer::*bindInternalImplementation)();
      #endif
  
      void(Framebuffer::*createImplementation)();
      void(Framebuffer::*renderbufferImplementation)(Framebuffer::BufferAttachment, GLuint);
      #ifndef MAGNUM_TARGET_GLES
      void(Framebuffer::*texture1DImplementation)(Framebuffer::BufferAttachment, GLuint, GLint);
      #endif
      void(Framebuffer::*texture2DImplementation)(Framebuffer::BufferAttachment, GLenum, GLuint, GLint);
      void(Framebuffer::*textureCubeMapImplementation)(Framebuffer::BufferAttachment, GLenum, GLuint, GLint);
      #if !defined(MAGNUM_TARGET_WEBGL) && !defined(MAGNUM_TARGET_GLES2)
      void(Framebuffer::*textureImplementation)(Framebuffer::BufferAttachment, GLuint, GLint);
      #endif
      #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
      void(Framebuffer::*textureLayerImplementation)(Framebuffer::BufferAttachment, GLuint, GLint, GLint);
      #endif
  
      void(Renderbuffer::*createRenderbufferImplementation)();
      void(Renderbuffer::*renderbufferStorageImplementation)(RenderbufferFormat, const Vector2i&);
      #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
      void(Renderbuffer::*renderbufferStorageMultisampleImplementation)(GLsizei, RenderbufferFormat, const Vector2i&);
      #endif
  
      void(*readImplementation)(const Range2Di&, PixelFormat, PixelType, std::size_t, GLvoid*);
  
      GLuint readBinding, drawBinding, renderbufferBinding;
      GLint maxDrawBuffers, maxColorAttachments, maxRenderbufferSize;
      #if !(defined(MAGNUM_TARGET_WEBGL) && defined(MAGNUM_TARGET_GLES2))
      GLint maxSamples;
      #endif
      #ifndef MAGNUM_TARGET_GLES
      GLint maxDualSourceDrawBuffers;
      #endif
      Range2Di viewport;
      Vector2i maxViewportSize;
  };
  
  }}}
  
  #endif
  