xrt_visibility_mask.h

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// Copyright 2023, Collabora, Ltd.
// SPDX-License-Identifier: BSL-1.0
/*!
 * @file
 * @brief  Header defining visibility mask helper struct.
 * @author Jakob Bornecrantz <jakob@collabora.com>
 * @ingroup xrt_iface
 */
 
#pragma once
 
#include "xrt/xrt_defines.h"
 
#ifdef __cplusplus
extern "C" {
#endif
 
/*!
 * Visibility mask helper, the indices and vertices are tightly packed after
 * this struct.
 *
 * @ingroup xrt_iface
 */
struct xrt_visibility_mask
{
        enum xrt_visibility_mask_type type;
        uint32_t index_count;
        uint32_t vertex_count;
};
 
/*!
 * Visibility mask helper function to get the indices.
 *
 * @ingroup xrt_iface
 */
static inline uint32_t *
xrt_visibility_mask_get_indices(const struct xrt_visibility_mask *mask)
{
        return (uint32_t *)&mask[1];
}
 
/*!
 * Visibility mask helper function to get the vertices.
 *
 * @ingroup xrt_iface
 */
static inline struct xrt_vec2 *
xrt_visibility_mask_get_vertices(const struct xrt_visibility_mask *mask)
{
        const uint32_t *indices = xrt_visibility_mask_get_indices(mask);
        return (struct xrt_vec2 *)&indices[mask->index_count];
}
 
/*!
 * Visibility mask helper function to get the total size of the struct.
 *
 * @ingroup xrt_iface
 */
static inline size_t
xrt_visibility_mask_get_size(const struct xrt_visibility_mask *mask)
{
        return sizeof(*mask) +                               //
               sizeof(uint32_t) * mask->index_count +        //
               sizeof(struct xrt_vec2) * mask->vertex_count; //
}
 
#ifdef __cplusplus
}
#endif