From eddcecbf74da26716509c047b95e85b00c12bab4 Mon Sep 17 00:00:00 2001 From: Benjamin Franzke <benjaminfranzke@googlemail.com> Date: Thu, 26 May 2011 15:09:39 +0200 Subject: Add gbm (generic/graphics buffer manager) --- src/gbm/main/backend.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 124 insertions(+) create mode 100644 src/gbm/main/backend.c (limited to 'src/gbm/main/backend.c') diff --git a/src/gbm/main/backend.c b/src/gbm/main/backend.c new file mode 100644 index 00000000000..2079bbb710d --- /dev/null +++ b/src/gbm/main/backend.c @@ -0,0 +1,124 @@ +/* + * Copyright © 2011 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT + * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, + * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + * + * Authors: + * Benjamin Franzke <benjaminfranzke@googlemail.com> + */ + +#include <stdio.h> +#include <stddef.h> +#include <stdlib.h> +#include <string.h> +#include <limits.h> +#include <dlfcn.h> + +#include "backend.h" + +#define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0])) + +struct backend_desc { + const char *name; + const struct gbm_backend *builtin; +}; + +static const struct backend_desc backends[] = { +}; + +static const void * +load_backend(const struct backend_desc *backend) +{ + char path[PATH_MAX]; + const void *init = NULL; + void *module; + const char *name; + const char *entrypoint = "gbm_backend"; + + if (backend == NULL) + return NULL; + + name = backend->name; + + if (backend->builtin) { + init = backend->builtin; + } else { + if (name[0] != '/') + snprintf(path, sizeof path, MODULEDIR "/%s", name); + else + snprintf(path, sizeof path, "%s", name); + + module = dlopen(path, RTLD_NOW | RTLD_GLOBAL); + if (!module) { + fprintf(stderr, + "failed to load module: %s\n", dlerror()); + return NULL; + } + + init = dlsym(module, entrypoint); + if (!init) + return NULL; + } + + return init; +} + +static const struct backend_desc * +find_backend(const char *name) +{ + const struct backend_desc *backend = NULL; + int i; + + for (i = 0; i < ARRAY_SIZE(backends); ++i) { + if (strcmp(backends[i].name, name) == 0) { + backend = &backends[i]; + break; + } + } + + return backend; +} + +struct gbm_device * +_gbm_create_device(int fd) +{ + const struct gbm_backend *backend = NULL; + struct gbm_device *dev = NULL; + int i; + const char *b; + + b = getenv("GBM_BACKEND"); + if (b) + backend = load_backend(find_backend(b)); + + if (backend) + dev = backend->create_device(fd); + + for (i = 0; i < ARRAY_SIZE(backends) && dev == NULL; ++i) { + backend = load_backend(&backends[i]); + if (backend == NULL) + continue; + + dev = backend->create_device(fd); + } + + return dev; +} -- cgit v1.2.3