427 lines
18 KiB
C
427 lines
18 KiB
C
/*
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* Copyright © 2021 NVIDIA Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "gbm_backend_abi.h" /* Current GBM backend ABI implementation */
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#include <stddef.h> /* offsetof */
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#include <stdio.h> /* printf */
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/*
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* The following are previous implementations of the structures defined in
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* gbm_backend_abi.h, with their ABI version appended.
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*
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* DO NOT EVER CHANGE EXISTING DEFINITIONS HERE!
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*
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* Changing them implies breaking the GBM backend ABI. Instead, to extend the
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* ABI, in gbm_backend_abi.h:
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*
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* -Add a new versioned struct
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* -Append it to the associated top-level object's struct
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* -Increment GBM_BACKEND_ABI_VERSION
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*
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* Then, here:
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*
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* -Add a new block of definitions below for the new ABI content
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* -Add a new block of checks in main()
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*/
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/*
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* From: Simon Ser - "gbm: assume USE_SCANOUT in create_with_modifiers"
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*
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* Note: ABI 1 is identical to ABI 0, except gbm_device_v0.bo_create can
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* provide both modifiers and usage.
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*/
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#define GBM_BACKEND_ABI_VERSION_abi0 1
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struct gbm_device_v0_abi0 {
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const struct gbm_backend_desc *backend_desc;
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uint32_t backend_version;
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int fd;
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const char *name;
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void (*destroy)(struct gbm_device *gbm);
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int (*is_format_supported)(struct gbm_device *gbm,
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uint32_t format,
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uint32_t usage);
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int (*get_format_modifier_plane_count)(struct gbm_device *device,
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uint32_t format,
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uint64_t modifier);
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struct gbm_bo *(*bo_create)(struct gbm_device *gbm,
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uint32_t width, uint32_t height,
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uint32_t format,
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uint32_t usage,
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const uint64_t *modifiers,
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const unsigned int count);
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struct gbm_bo *(*bo_import)(struct gbm_device *gbm, uint32_t type,
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void *buffer, uint32_t usage);
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void *(*bo_map)(struct gbm_bo *bo,
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uint32_t x, uint32_t y,
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uint32_t width, uint32_t height,
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uint32_t flags, uint32_t *stride,
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void **map_data);
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void (*bo_unmap)(struct gbm_bo *bo, void *map_data);
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int (*bo_write)(struct gbm_bo *bo, const void *buf, size_t data);
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int (*bo_get_fd)(struct gbm_bo *bo);
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int (*bo_get_planes)(struct gbm_bo *bo);
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union gbm_bo_handle (*bo_get_handle)(struct gbm_bo *bo, int plane);
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int (*bo_get_plane_fd)(struct gbm_bo *bo, int plane);
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uint32_t (*bo_get_stride)(struct gbm_bo *bo, int plane);
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uint32_t (*bo_get_offset)(struct gbm_bo *bo, int plane);
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uint64_t (*bo_get_modifier)(struct gbm_bo *bo);
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void (*bo_destroy)(struct gbm_bo *bo);
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struct gbm_surface *(*surface_create)(struct gbm_device *gbm,
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uint32_t width, uint32_t height,
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uint32_t format, uint32_t flags,
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const uint64_t *modifiers,
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const unsigned count);
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struct gbm_bo *(*surface_lock_front_buffer)(struct gbm_surface *surface);
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void (*surface_release_buffer)(struct gbm_surface *surface,
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struct gbm_bo *bo);
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int (*surface_has_free_buffers)(struct gbm_surface *surface);
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void (*surface_destroy)(struct gbm_surface *surface);
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};
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struct gbm_device_abi0 {
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/* Hack to make a gbm_device detectable by its first element. */
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struct gbm_device *(*dummy)(int);
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struct gbm_device_v0_abi0 v0;
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};
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/**
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* GBM buffer object interface corresponding to GBM_BACKEND_ABI_VERSION = 0
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*
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* DO NOT MODIFY THIS STRUCT. Instead, introduce a gbm_bo_v1, increment
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* GBM_BACKEND_ABI_VERSION, and append gbm_bo_v1 to gbm_bo.
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*/
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struct gbm_bo_v0_abi0 {
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uint32_t width;
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uint32_t height;
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uint32_t stride;
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uint32_t format;
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union gbm_bo_handle handle;
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void *user_data;
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void (*destroy_user_data)(struct gbm_bo *, void *);
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};
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/**
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* The allocated buffer object.
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*
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* The members in this structure should not be accessed directly.
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*
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* To modify this structure, introduce a new gbm_bo_v<N> structure, add it to
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* the end of this structure, and increment GBM_BACKEND_ABI_VERSION.
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*/
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struct gbm_bo_abi0 {
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struct gbm_device *gbm;
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struct gbm_bo_v0_abi0 v0;
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};
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/**
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* GBM surface interface corresponding to GBM_BACKEND_ABI_VERSION = 0
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*
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* DO NOT MODIFY THIS STRUCT. Instead, introduce a gbm_surface_v1, increment
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* GBM_BACKEND_ABI_VERSION, and append gbm_surface_v1 to gbm_surface.
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*/
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struct gbm_surface_v0_abi0 {
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uint32_t width;
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uint32_t height;
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uint32_t format;
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uint32_t flags;
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struct {
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uint64_t *modifiers;
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unsigned count;
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};
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};
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/**
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* An allocated GBM surface.
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*
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* To modify this structure, introduce a new gbm_surface_v<N> structure, add it
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* to the end of this structure, and increment GBM_BACKEND_ABI_VERSION.
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*/
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struct gbm_surface_abi0 {
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struct gbm_device *gbm;
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struct gbm_surface_v0_abi0 v0;
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};
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/**
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* GBM backend interfaces corresponding to GBM_BACKEND_ABI_VERSION = 0
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*
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* DO NOT MODIFY THIS STRUCT. Instead, introduce a gbm_backend_v1, increment
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* GBM_BACKEND_ABI_VERSION, append gbm_backend_v1 to gbm_backend.
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*/
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struct gbm_backend_v0_abi0 {
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/**
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* The version of the GBM backend interface supported by this backend. This
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* is set by the backend itself, and may be greater or less than the version
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* supported by the loader. It is the responsibility of the GBM loader to
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* respect this version when accessing fields in this structure.
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*/
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uint32_t backend_version;
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const char *backend_name;
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struct gbm_device *(*create_device)(int fd, uint32_t gbm_backend_version);
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};
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/**
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* The interface exposed by an external GBM backend.
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*
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* To modify this structure, introduce a new gbm_backend_v<N> structure, add it
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* to the end of this structure, and increment GBM_BACKEND_ABI_VERSION.
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*/
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struct gbm_backend_abi0 {
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struct gbm_backend_v0_abi0 v0;
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};
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/**
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* GBM interfaces exposed to GBM backends at GBM_BACKEND_ABI_VERSION >= 0
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*
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* DO NOT MODIFY THIS STRUCT. Instead, introduce a gbm_core_v1, increment
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* GBM_BACKEND_ABI_VERSION, and append gbm_core_v1 to gbm_backend.
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*/
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struct gbm_core_v0_abi0 {
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/**
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* The version of the GBM backend interface supported by the GBM loader. This
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* is set by the loader, and may be greater or less than the version
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* supported by a given backend. It is the responsibility of the backend to
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* respect this version when accessing fields in this structure and other
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* structures allocated or modified by the loader.
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*/
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uint32_t core_version;
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uint32_t (*format_canonicalize)(uint32_t gbm_format);
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};
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/**
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* The interface exposed by the GBM core/loader code to GBM backends.
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*
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* To modify this structure, introduce a new gbm_core_v<N> structure, add it
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* to the end of this structure, and increment GBM_BACKEND_ABI_VERSION.
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*/
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struct gbm_core_abi0 {
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struct gbm_core_v0_abi0 v0;
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};
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typedef const struct gbm_backend *(*GBM_GET_BACKEND_PROC_PTR_abi0)(const struct gbm_core *gbm_core);
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/*
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* Structure/member ABI-checking helper macros
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*/
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#define MEMBER_SIZE(type, member) sizeof(((type *)0)->member)
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#define CHECK_RENAMED_MEMBER_BASE(type, a_ver, b_ver, a_member, b_member) \
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do { \
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if (offsetof(struct type ## a_ver, a_member) != \
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offsetof(struct type ## b_ver, b_member)) { \
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printf("Backards incompatible change detected!\n " \
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"offsetof(struct " #type #a_ver "::" #a_member ") != " \
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"offsetof(struct " #type #b_ver "::" #b_member ")\n"); \
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return 1; \
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} \
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\
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if (MEMBER_SIZE(struct type ## a_ver, a_member) != \
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MEMBER_SIZE(struct type ## b_ver, b_member)) { \
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printf("Backards incompatible change detected!\n " \
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"MEMBER_SIZE(struct " #type #a_ver "::" #a_member ") != " \
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"MEMBER_SIZE(struct " #type #b_ver "::" #b_member ")\n"); \
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return 1; \
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} \
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} while (0)
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#define CHECK_RENAMED_MEMBER_TYPE(type, a_ver, b_ver, a_member, b_member) \
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do { \
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/* Compile-time type compatibility check */ \
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struct type ## a_ver a; \
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struct type ## b_ver b = {0}; \
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a.a_member = b.b_member; \
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(void)a; \
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} while (0)
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#define CHECK_RENAMED_MEMBER(type, a_ver, b_ver, a_member, b_member) \
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do { \
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CHECK_RENAMED_MEMBER_BASE(type, a_ver, b_ver, a_member, b_member); \
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CHECK_RENAMED_MEMBER_TYPE(type, a_ver, b_ver, a_member, b_member); \
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} while (0)
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#define CHECK_RENAMED_MEMBER_NO_TYPE(type, a_ver, b_ver, a_member, b_member) \
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CHECK_RENAMED_MEMBER_BASE(type, a_ver, b_ver, a_member, b_member);
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#define CHECK_MEMBER(type, a_ver, b_ver, member) \
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CHECK_RENAMED_MEMBER(type, a_ver, b_ver, member, member)
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#define CHECK_MEMBER_NO_TYPE(type, a_ver, b_ver, member) \
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CHECK_RENAMED_MEMBER_NO_TYPE(type, a_ver, b_ver, member, member)
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#define CHECK_MEMBER_CURRENT(type, a_ver, member) \
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CHECK_MEMBER(type, a_ver,, member)
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#define CHECK_MEMBER_CURRENT_NO_TYPE(type, a_ver, member) \
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CHECK_MEMBER_NO_TYPE(type, a_ver,, member)
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#define CHECK_SIZE(type, a_ver, b_ver) \
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do { \
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if (sizeof(struct type ## a_ver) > \
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sizeof(struct type ## b_ver)) { \
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printf("Backards incompatible change detected!\n " \
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"sizeof(struct " #type #a_ver ") > " \
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"sizeof(struct " #type #b_ver ")\n"); \
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return 1; \
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} \
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} while (0)
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#define CHECK_SIZE_CURRENT(type, a_ver) \
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do { \
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if (sizeof(struct type ## a_ver) != \
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sizeof(struct type)) { \
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printf("Backards incompatible change detected!\n " \
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"sizeof(struct " #type #a_ver ") != " \
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"sizeof(struct " #type ")\n"); \
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return 1; \
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} \
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} while (0)
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#define CHECK_VERSION(a_ver, b_ver) \
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do { \
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if ((GBM_BACKEND_ABI_VERSION ## a_ver) >= \
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(GBM_BACKEND_ABI_VERSION ## b_ver)) { \
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printf("Backards incompatible change detected!\n " \
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"GBM_BACKEND_ABI_VERSION" #a_ver " >= " \
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"GBM_BACKEND_ABI_VERSION" #b_ver "\n"); \
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return 1; \
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} \
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} while (0)
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#define CHECK_VERSION_CURRENT(a_ver) \
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do { \
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if ((GBM_BACKEND_ABI_VERSION ## a_ver) != \
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(GBM_BACKEND_ABI_VERSION)) { \
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printf("Backards incompatible change detected!\n " \
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"GBM_BACKEND_ABI_VERSION" #a_ver " != " \
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"GBM_BACKEND_ABI_VERSION\n"); \
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return 1; \
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} \
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} while (0)
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#define CHECK_PROC(proc, a_ver, b_ver) \
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do { \
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proc ## a_ver a; \
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proc ## b_ver b = NULL; \
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a = b; \
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(void)a; \
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} while (0)
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#define CHECK_PROC_CURRENT(proc, a_ver) \
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CHECK_PROC(proc, a_ver,)
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int main(int argc, char **argv)
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{
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/********************************************/
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/*** Compare Current ABI to ABI version 0 ***/
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/********************************************/
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/* Check current gbm_device ABI against gbm_device_abi0*/
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CHECK_MEMBER_CURRENT(gbm_device, _abi0, dummy);
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CHECK_MEMBER_CURRENT_NO_TYPE(gbm_device, _abi0, v0);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, backend_desc);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, backend_version);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, fd);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, name);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, destroy);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, is_format_supported);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, get_format_modifier_plane_count);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_create);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_import);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_map);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_unmap);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_write);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_get_fd);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_get_planes);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_get_handle);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_get_plane_fd);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_get_stride);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_get_offset);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_get_modifier);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, bo_destroy);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, surface_create);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, surface_lock_front_buffer);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, surface_release_buffer);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, surface_has_free_buffers);
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CHECK_MEMBER_CURRENT(gbm_device_v0, _abi0, surface_destroy);
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/* Size of ABI-versioned substructures verified by above member checks */
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CHECK_SIZE_CURRENT (gbm_device, _abi0);
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/* Check current gbm_bo ABI against gbm_bo_abi0*/
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CHECK_MEMBER_CURRENT(gbm_bo, _abi0, gbm);
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CHECK_MEMBER_CURRENT_NO_TYPE(gbm_bo, _abi0, v0);
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CHECK_MEMBER_CURRENT(gbm_bo_v0, _abi0, width);
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CHECK_MEMBER_CURRENT(gbm_bo_v0, _abi0, height);
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CHECK_MEMBER_CURRENT(gbm_bo_v0, _abi0, stride);
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CHECK_MEMBER_CURRENT(gbm_bo_v0, _abi0, format);
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CHECK_MEMBER_CURRENT(gbm_bo_v0, _abi0, handle);
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CHECK_MEMBER_CURRENT(gbm_bo_v0, _abi0, user_data);
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CHECK_MEMBER_CURRENT(gbm_bo_v0, _abi0, destroy_user_data);
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/* Size of ABI-versioned substructures verified by above member checks */
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CHECK_SIZE_CURRENT (gbm_bo, _abi0);
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/* Check current gbm_surface ABI against gbm_surface_abi0 */
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CHECK_MEMBER_CURRENT(gbm_surface, _abi0, gbm);
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CHECK_MEMBER_CURRENT_NO_TYPE(gbm_surface, _abi0, v0);
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CHECK_MEMBER_CURRENT(gbm_surface_v0, _abi0, width);
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CHECK_MEMBER_CURRENT(gbm_surface_v0, _abi0, height);
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CHECK_MEMBER_CURRENT(gbm_surface_v0, _abi0, format);
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CHECK_MEMBER_CURRENT(gbm_surface_v0, _abi0, flags);
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CHECK_MEMBER_CURRENT(gbm_surface_v0, _abi0, modifiers);
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CHECK_MEMBER_CURRENT(gbm_surface_v0, _abi0, count);
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/* Size of ABI-versioned substructures verified by above member checks */
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CHECK_SIZE_CURRENT (gbm_surface, _abi0);
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/* Check current gbm_backend ABI against gbm_backend_abi0 */
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CHECK_MEMBER_CURRENT_NO_TYPE(gbm_backend, _abi0, v0);
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CHECK_MEMBER_CURRENT(gbm_backend_v0, _abi0, backend_version);
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CHECK_MEMBER_CURRENT(gbm_backend_v0, _abi0, backend_name);
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CHECK_MEMBER_CURRENT(gbm_backend_v0, _abi0, create_device);
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/* Size of ABI-versioned substructures verified by above member checks */
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CHECK_SIZE_CURRENT (gbm_backend, _abi0);
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/* Check current gbm_core ABI against gbm_core_abi0 */
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CHECK_MEMBER_CURRENT_NO_TYPE(gbm_core, _abi0, v0);
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CHECK_MEMBER_CURRENT(gbm_core_v0, _abi0, core_version);
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CHECK_MEMBER_CURRENT(gbm_core_v0, _abi0, format_canonicalize);
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/* Size of ABI-versioned substructures verified by above member checks */
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CHECK_SIZE_CURRENT (gbm_core, _abi0);
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CHECK_PROC_CURRENT (GBM_GET_BACKEND_PROC_PTR, _abi0);
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return 0;
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}
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