GHOST_XrSession.h

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/*
 * 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.
 */
 
#pragma once
 
#include <map>
#include <memory>
 
#include "GHOST_Xr_intern.h"
 
class GHOST_XrContext;
class GHOST_XrSwapchain;
struct GHOST_XrDrawInfo;
struct OpenXRSessionData;
 
class GHOST_XrSession {
 public:
  enum LifeExpectancy {
    SESSION_KEEP_ALIVE,
    SESSION_DESTROY,
  };
 
  GHOST_XrSession(GHOST_XrContext &xr_context);
  ~GHOST_XrSession();
 
  void start(const GHOST_XrSessionBeginInfo *begin_info);
  void requestEnd();
 
  LifeExpectancy handleStateChangeEvent(const XrEventDataSessionStateChanged &lifecycle);
 
  bool isRunning() const;
  bool needsUpsideDownDrawing() const;
 
  void unbindGraphicsContext(); /* Public so context can ensure it's unbound as needed. */
 
  void draw(void *draw_customdata);
 
 private:
  class GHOST_XrContext *m_context;
 
  std::unique_ptr<OpenXRSessionData> m_oxr; /* Could use stack, but PImpl is preferable. */
 
  class GHOST_Context *m_gpu_ctx = nullptr;
  std::unique_ptr<class GHOST_IXrGraphicsBinding> m_gpu_binding;
 
  std::unique_ptr<GHOST_XrDrawInfo> m_draw_info;
 
  void initSystem();
  void beginSession();
  void endSession();
 
  void bindGraphicsContext();
 
  void prepareDrawing();
  XrCompositionLayerProjection drawLayer(
      std::vector<XrCompositionLayerProjectionView> &r_proj_layer_views, void *draw_customdata);
  void drawView(GHOST_XrSwapchain &swapchain,
                XrCompositionLayerProjectionView &r_proj_layer_view,
                XrSpaceLocation &view_location,
                XrView &view,
                void *draw_customdata);
  void beginFrameDrawing();
  void endFrameDrawing(std::vector<XrCompositionLayerBaseHeader *> &layers);
};