49e56c3c0d
This just makes it clearer the array isn't a global list of all backends in use. Signed-off-by: James Jones <jajones@nvidia.com> Reviewed-by: Michel Dänzer <mdaenzer@redhat.com> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9902>
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/*
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* Copyright © 2011 Intel 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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* Authors:
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* Benjamin Franzke <benjaminfranzke@googlemail.com>
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <limits.h>
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#include <assert.h>
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#include "backend.h"
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#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
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#define VER_MIN(a, b) ((a) < (b) ? (a) : (b))
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extern const struct gbm_backend gbm_dri_backend;
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struct gbm_backend_desc {
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const char *name;
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const struct gbm_backend *backend;
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};
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static const struct gbm_backend_desc builtin_backends[] = {
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{ "gbm_dri.so", &gbm_dri_backend },
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};
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static struct gbm_device *
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find_backend(const char *name, int fd)
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{
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struct gbm_device *dev = NULL;
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const struct gbm_backend_desc *bd;
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unsigned i;
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uint32_t abi_ver;
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for (i = 0; i < ARRAY_SIZE(builtin_backends); ++i) {
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bd = &builtin_backends[i];
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if (name && strcmp(bd->name, name))
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continue;
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abi_ver = VER_MIN(GBM_BACKEND_ABI_VERSION,
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bd->backend->v0.backend_version);
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dev = bd->backend->v0.create_device(fd, abi-ver);
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if (dev) {
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assert(abi_ver == dev->v0.backend_version);
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dev->v0.backend_desc = bd;
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break;
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}
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}
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return dev;
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}
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static struct gbm_device *
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override_backend(int fd)
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{
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struct gbm_device *dev = NULL;
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const char *b;
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b = getenv("GBM_BACKEND");
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if (b)
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dev = find_backend(b, fd);
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return dev;
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}
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struct gbm_device *
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_gbm_create_device(int fd)
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{
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struct gbm_device *dev;
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dev = override_backend(fd);
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if (!dev)
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dev = find_backend(NULL, fd);
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return dev;
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}
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void
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_gbm_device_destroy(struct gbm_device *gbm)
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{
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gbm->v0.destroy(gbm);
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}
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