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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.
*/
/** \file
* \ingroup GHOST
*/
#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:
/** Pointer back to context managing this session. Would be nice to avoid, but needed to access
* custom callbacks set before session start. */
class GHOST_XrContext *m_context;
std::unique_ptr<OpenXRSessionData> m_oxr; /* Could use stack, but PImpl is preferable. */
/** Active Ghost graphic context. Owned by Blender, not GHOST. */
class GHOST_Context *m_gpu_ctx = nullptr;
std::unique_ptr<class GHOST_IXrGraphicsBinding> m_gpu_binding;
/** Rendering information. Set when drawing starts. */
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);
};
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