b_app_policy.h

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// Copyright 2026, Beyley Cardellio.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Helper to implement @ref xrt_app_instance and @ref xrt_app_system.
 * @author Beyley Cardellio <ep1cm1n10n123@gmail.com>
 * @ingroup base
 */
 
#pragma once
 
#include "xrt/xrt_app_policy.h"
#include "xrt/xrt_compositor.h"
 
#include "os/os_threading.h"
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
/*!
 * @implements xrt_app_instance
 */
struct b_app_instance
{
        struct xrt_app_instance base;
 
        //! Data for stored app systems
        struct
        {
                struct os_mutex mutex;
 
                //! Number of application systems stored
                uint32_t count;
                //! Capacity of the storage pointer
                uint32_t capacity;
                //! The storage pointer for all the application systems
                struct xrt_app_system **storage;
        } app_systems;
};
 
/*!
 * @implements xrt_app_system
 */
struct b_app_system
{
        struct xrt_app_system base;
 
        //! The parent @ref xrt_app_instance
        struct xrt_app_instance *xainst;
 
        //! The @ref xrt_system this is wrapping
        struct xrt_system *xsys;
 
        struct os_mutex view_config_mutex;
        struct xrt_recommended_view_config view_configs[XRT_VIEW_TYPE_MAX];
};
 
 
/*!
 * Create a @ref b_app_instance, a fully working @ref xrt_app_instance. Objects wishing to
 * use @ref b_app_instance as a parent class should use @ref b_app_instance_init.
 *
 * @public @memberof b_app_instance
 * @ingroup base
 * @see b_app_instance_init
 */
struct b_app_instance *
b_app_instance_create(void);
 
/*!
 * Inits a @ref b_app_instance struct when used as a parent class, only to be used externally by the derived class.
 * Not needed to be called if created by @ref b_app_instance_create.
 *
 * @protected @memberof b_app_instance
 * @ingroup base
 */
bool
b_app_instance_init(struct b_app_instance *bainst, void (*destroy_fn)(struct xrt_app_instance *));
 
/*!
 * Finalizes a @ref b_app_instance struct when used as a parent class, only to be used
 * by the derived class. This will not free the @ref b_app_instance pointer itself but will
 * free any resources created by the default implementation functions. Not
 * needed to be called if created by @ref b_app_instance_create, instead use
 * xrt_app_instance::destroy.
 *
 * @protected @memberof b_app_instance
 * @ingroup base
 */
void
b_app_instance_fini(struct b_app_instance *bainst);
 
 
/*!
 * Inits a @ref b_app_system struct when used as a parent class, only to be used
 * by the derived class. Not needed to be called if created by @ref b_app_instance_create_app_system.
 *
 * @protected @memberof b_app_system
 * @ingroup base
 */
bool
b_app_system_init(struct xrt_app_instance *xainst,
                  struct b_app_system *basys,
                  struct xrt_system *xsys,
                  void (*destroy_fn)(struct xrt_app_system *));
 
/*!
 * Finalizes a @ref b_app_system struct when used as a parent class, only to be used
 * by the derived class. This will not free the @ref b_app_system pointer itself but will
 * free any resources created by the default implementation functions. Not
 * needed to be called if created by @ref b_app_instance_create_app_system, instead use
 * xrt_app_system::destroy.
 *
 * @protected @memberof b_app_system
 * @ingroup base
 */
void
b_app_system_fini(struct b_app_system *basys);
 
 
#ifdef __cplusplus
}
#endif