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fa8047fed3
This should replace all manual poking of the next chain. Prefer the macros over the functions since they'll do your casting for you.
95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
// Copyright 2019, Collabora, Ltd.
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// SPDX-License-Identifier: BSL-1.0
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/*!
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* @file
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* @brief Utilities for accessing members in an OpenXR structure chain.
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* @author Ryan Pavlik <ryan.pavlik@collabora.com>
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*/
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#pragma once
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#include <xrt/xrt_openxr_includes.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*!
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* @ingroup oxr_api
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* @{
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*/
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/*!
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* Finds an input struct of the given type in a next-chain.
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*
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* Returns NULL if nothing matching is found.
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*
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* Prefer using OXR_GET_INPUT_FROM_CHAIN() instead, since it includes the
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* casting.
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*/
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static inline XrBaseInStructure const*
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oxr_find_input_in_chain(const void* ptr, XrStructureType desired)
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{
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while (ptr != NULL) {
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XrBaseInStructure const* base = (XrBaseInStructure const*)ptr;
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if (base->type == desired) {
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return base;
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}
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ptr = base->next;
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}
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return NULL;
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}
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/*!
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* Finds an input struct of the given type in a next-chain and casts it as
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* desired.
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*
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* Returns NULL if nothing matching is found.
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*
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* Note: There is no protection here to ensure that STRUCTURE_TYPE_ENUM (an
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* XrStructureType value) and TYPE (a type name) actually match!
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*/
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#define OXR_GET_INPUT_FROM_CHAIN(PTR, STRUCTURE_TYPE_ENUM, TYPE) \
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((TYPE const*)oxr_find_input_in_chain(PTR, STRUCTURE_TYPE_ENUM))
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/*!
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* Finds an output struct of the given type in a next-chain.
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*
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* Returns NULL if nothing matching is found.
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*
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* Prefer using OXR_GET_OUTPUT_FROM_CHAIN() instead, since it includes the
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* casting.
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*/
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static inline XrBaseOutStructure*
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oxr_find_output_in_chain(void* ptr, XrStructureType desired)
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{
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while (ptr != NULL) {
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XrBaseOutStructure* base = (XrBaseOutStructure*)ptr;
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if (base->type == desired) {
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return base;
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}
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ptr = base->next;
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}
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return NULL;
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}
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/*!
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* Finds an output struct of the given type in a next-chain and casts it as
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* desired.
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*
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* Returns NULL if nothing matching is found.
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*
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* Note: There is no protection here to ensure that STRUCTURE_TYPE_ENUM (an
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* XrStructureType value) and TYPE (a type name) actually match!
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*/
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#define OXR_GET_OUTPUT_FROM_CHAIN(PTR, STRUCTURE_TYPE_ENUM, TYPE) \
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((TYPE*)oxr_find_output_in_chain(PTR, STRUCTURE_TYPE_ENUM))
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/*!
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif
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