u_native_images_debug.h

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// Copyright 2023-2024, Collabora, Ltd.
// Copyright 2026, NVIDIA CORPORATION.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Special code for managing a variable tracked swapchain.
 * @author Jakob Bornecrantz <jakob@collabora.com>
 * @ingroup aux_util
 */
 
#pragma once
 
#include "os/os_threading.h"
#include "xrt/xrt_compositor.h"
 
 
#ifdef __cplusplus
extern "C" {
#endif
 
 
/*!
 * A struct for debugging one or more native images.
 *
 * @ingroup aux_util
 */
struct u_native_images_debug
{
        //! Is initialised/destroyed when added or root is removed.
        struct os_mutex mutex;
 
        /*!
         * Process unique id for the set of images, protected by @p mutex,
         * allows caching of imports. Created by @ref u_limited_unique_id_get.
         */
        xrt_limited_unique_id_t limited_unique_id;
 
        //! List to current set of native images, protected by @p mutex.
        struct xrt_image_native *native_images;
 
        //! Count of @p native_images, protected by @p mutex.
        uint32_t native_image_count;
 
        /*!
         * Information needed to import the native images, information in the
         * struct is immutable, the pointer is protected by @p mutex.
         */
        const struct xrt_swapchain_create_info *xscci;
 
        /*!
         * The native image that was last filled in by the source, only
         * valid if @p native_images is non-null, protected by @p mutex.
         */
        uint32_t active_index;
 
        //! Should the image be flipped in y direction.
        bool flip_y;
};
 
/*!
 * Must be called before variable is tracked.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_init(struct u_native_images_debug *unid)
{
        os_mutex_init(&unid->mutex);
}
 
/*!
 * Must not be called while variable longer tracked, after @p u_var_remove_root.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_destroy(struct u_native_images_debug *unid)
{
        os_mutex_destroy(&unid->mutex);
        unid->native_images = NULL;
        unid->native_image_count = 0;
        unid->xscci = NULL;
        unid->active_index = 0;
        unid->flip_y = false;
}
 
/*!
 * Simple lock helper.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_lock(struct u_native_images_debug *unid)
{
        os_mutex_lock(&unid->mutex);
}
 
/*!
 * Simple lock helper.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_unlock(struct u_native_images_debug *unid)
{
        os_mutex_unlock(&unid->mutex);
}
 
/*!
 * Helper function to update all variables, must be called with the lock held.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_set_locked(struct u_native_images_debug *unid,
                                 xrt_limited_unique_id_t limited_unique_id,
                                 struct xrt_image_native *native_images,
                                 uint32_t native_image_count,
                                 const struct xrt_swapchain_create_info *xscci,
                                 uint32_t active_index,
                                 bool flip_y)
{
        unid->limited_unique_id = limited_unique_id;
        unid->native_images = native_images;
        unid->native_image_count = native_image_count;
        unid->active_index = active_index;
        unid->xscci = xscci;
        unid->flip_y = flip_y;
}
 
/*!
 * Updates all variables atomically by holding the lock.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_set(struct u_native_images_debug *unid,
                          xrt_limited_unique_id_t limited_unique_id,
                          struct xrt_image_native *native_images,
                          uint32_t native_image_count,
                          const struct xrt_swapchain_create_info *xscci,
                          uint32_t active_index,
                          bool flip_y)
{
        u_native_images_debug_lock(unid);
        u_native_images_debug_set_locked( //
            unid,                         //
            limited_unique_id,            //
            native_images,                //
            native_image_count,           //
            xscci,                        //
            active_index,                 //
            flip_y);                      //
        u_native_images_debug_unlock(unid);
}
 
/*!
 * Clear all variables, must be called with the lock held.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_clear_locked(struct u_native_images_debug *unid)
{
        unid->limited_unique_id.data = 0;
        unid->xscci = NULL;
        unid->active_index = 0;
        unid->native_images = NULL;
        unid->native_image_count = 0;
}
 
/*!
 * Clear all variables atomically by holding the lock, still valid to use.
 *
 * @ingroup aux_util
 */
static inline void
u_native_images_debug_clear(struct u_native_images_debug *unid)
{
        u_native_images_debug_lock(unid);
        u_native_images_debug_clear_locked(unid);
        u_native_images_debug_unlock(unid);
}
 
 
#ifdef __cplusplus
}
#endif