text: /*
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * 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 General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   */
  
  /** \file
   * \ingroup GHOST
   */
  
  #ifndef __GHOST_IXRGRAPHICSBINDING_H__
  #define __GHOST_IXRGRAPHICSBINDING_H__
  
  #include <memory>
  #include <string>
  #include <vector>
  
  #include "GHOST_Xr_openxr_includes.h"
  
  class GHOST_IXrGraphicsBinding {
    friend std::unique_ptr<GHOST_IXrGraphicsBinding> GHOST_XrGraphicsBindingCreateFromType(
        GHOST_TXrGraphicsBinding type);
  
   public:
    union {
  #if defined(WITH_X11)
      XrGraphicsBindingOpenGLXlibKHR glx;
  #elif defined(WIN32)
      XrGraphicsBindingOpenGLWin32KHR wgl;
      XrGraphicsBindingD3D11KHR d3d11;
  #endif
    } oxr_binding;
  
    virtual ~GHOST_IXrGraphicsBinding() = default;
  
    /**
     * Does __not__ require this object is initialized (can be called prior to
     * #initFromGhostContext). It's actually meant to be called first.
     *
     * \param r_requirement_info Return argument to retrieve an informal string on the requirements
     *                           to be met. Useful for error/debug messages.
     */
    virtual bool checkVersionRequirements(class GHOST_Context *ghost_ctx,
                                          XrInstance instance,
                                          XrSystemId system_id,
                                          std::string *r_requirement_info) const = 0;
    virtual void initFromGhostContext(class GHOST_Context *ghost_ctx) = 0;
    virtual bool chooseSwapchainFormat(const std::vector<int64_t> &runtime_formats,
                                       int64_t *r_result) const = 0;
    virtual std::vector<XrSwapchainImageBaseHeader *> createSwapchainImages(
        uint32_t image_count) = 0;
    virtual void submitToSwapchainImage(XrSwapchainImageBaseHeader *swapchain_image,
                                        const GHOST_XrDrawViewInfo *draw_info) = 0;
    virtual bool needsUpsideDownDrawing(GHOST_Context &ghost_ctx) const = 0;
  
   protected:
    /* Use GHOST_XrGraphicsBindingCreateFromType! */
    GHOST_IXrGraphicsBinding() = default;
  };
  
  std::unique_ptr<GHOST_IXrGraphicsBinding> GHOST_XrGraphicsBindingCreateFromType(
      GHOST_TXrGraphicsBinding type, GHOST_Context *ghost_ctx);
  
  #endif /* __GHOST_IXRGRAPHICSBINDING_H__ */
  