src/gbm/main/gbm.c

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  19  * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  20  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  26  */
  27
  28 #define _BSD_SOURCE
  29
  30 #include <stddef.h>
  31 #include <stdio.h>
  32 #include <stdlib.h>
  33 #include <string.h>
  34 #include <stdint.h>
  35
  36 #include <sys/types.h>
  37 #include <sys/stat.h>
  38 #include <unistd.h>
  39
  40 #include "gbm.h"
  41 #include "gbmint.h"
  42 #include "common.h"
  43 #include "backend.h"
  44
  45 #define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
  46
  47 struct gbm_device *devices[16];
  48
  49 static int device_num = 0;
  50
  51 GBM_EXPORT int
  52 gbm_device_get_fd(struct gbm_device *gbm)
  53 {
  54    return gbm->fd;
  55 }
  56
  57 /* FIXME: maybe superfluous, use udev subclass from the fd? */
  58 GBM_EXPORT const char *
  59 gbm_device_get_backend_name(struct gbm_device *gbm)
  60 {
  61    return gbm->name;
  62 }
  63
  64 int
  65 gbm_device_is_format_supported(struct gbm_device *gbm,
  66                                enum gbm_bo_format format,
  67                                uint32_t usage)
  68 {
  69    return gbm->is_format_supported(gbm, format, usage);
  70 }
  71
  72 GBM_EXPORT void
  73 gbm_device_destroy(struct gbm_device *gbm)
  74 {
  75    gbm->refcount--;
  76    if (gbm->refcount == 0)
  77       gbm->destroy(gbm);
  78 }
  79
  80 GBM_EXPORT struct gbm_device *
  81 _gbm_mesa_get_device(int fd)
  82 {
  83    struct gbm_device *gbm = NULL;
  84    struct stat buf;
  85    dev_t dev;
  86    int i;
  87
  88    if (fd < 0 || fstat(fd, &buf) < 0 || !S_ISCHR(buf.st_mode)) {
  89       fprintf(stderr, "_gbm_mesa_get_device: invalid fd: %d\n", fd);
  90       return NULL;
  91    }
  92
  93    for (i = 0; i < device_num; ++i) {
  94       dev = devices[i]->stat.st_rdev;
  95       if (major(dev) == major(buf.st_rdev) &&
  96           minor(dev) == minor(buf.st_rdev)) {
  97          gbm = devices[i];
  98          gbm->refcount++;
  99          break;
 100       }
 101    }
 102
 103    return gbm;
 104 }
 105
 106 GBM_EXPORT struct gbm_device *
 107 gbm_create_device(int fd)
 108 {
 109    struct gbm_device *gbm = NULL;
 110    struct stat buf;
 111
 112    if (fd < 0 || fstat(fd, &buf) < 0 || !S_ISCHR(buf.st_mode)) {
 113       fprintf(stderr, "gbm_create_device: invalid fd: %d\n", fd);
 114       return NULL;
 115    }
 116
 117    if (device_num == 0)
 118       memset(devices, 0, sizeof devices);
 119
 120    gbm = _gbm_create_device(fd);
 121    if (gbm == NULL)
 122       return NULL;
 123
 124    gbm->dummy = gbm_create_device;
 125    gbm->stat = buf;
 126    gbm->refcount = 1;
 127
 128    if (device_num < ARRAY_SIZE(devices)-1)
 129       devices[device_num++] = gbm;
 130
 131    return gbm;
 132 }
 133
 134 GBM_EXPORT unsigned int
 135 gbm_bo_get_width(struct gbm_bo *bo)
 136 {
 137    return bo->width;
 138 }
 139
 140 GBM_EXPORT unsigned int
 141 gbm_bo_get_height(struct gbm_bo *bo)
 142 {
 143    return bo->height;
 144 }
 145
 146 GBM_EXPORT uint32_t
 147 gbm_bo_get_pitch(struct gbm_bo *bo)
 148 {
 149    return bo->pitch;
 150 }
 151
 152 GBM_EXPORT union gbm_bo_handle
 153 gbm_bo_get_handle(struct gbm_bo *bo)
 154 {
 155    return bo->handle;
 156 }
 157
 158 GBM_EXPORT void
 159 gbm_bo_destroy(struct gbm_bo *bo)
 160 {
 161    bo->gbm->bo_destroy(bo);
 162 }
 163
 164 GBM_EXPORT struct gbm_bo *
 165 gbm_bo_create(struct gbm_device *gbm,
 166               uint32_t width, uint32_t height,
 167               enum gbm_bo_format format, uint32_t usage)
 168 {
 169    if (width == 0 || height == 0)
 170       return NULL;
 171
 172    if (usage & GBM_BO_USE_CURSOR_64X64 &&
 173        (width != 64 || height != 64))
 174       return NULL;
 175
 176    return gbm->bo_create(gbm, width, height, format, usage);
 177 }
 178
 179 GBM_EXPORT struct gbm_bo *
 180 gbm_bo_create_from_egl_image(struct gbm_device *gbm,
 181                              void *egl_dpy, void *egl_image,
 182                              uint32_t width, uint32_t height,
 183                              uint32_t usage)
 184 {
 185    if (width == 0 || height == 0)
 186       return NULL;
 187
 188    return gbm->bo_create_from_egl_image(gbm, egl_dpy, egl_image,
 189                                         width, height, usage);
 190 }