c046b1ad7c8a28fd564b635ebfe01a8adeaecb6d
2 * Copyright © 2011 Intel Corporation
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:
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
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.
25 * Benjamin Franzke <benjaminfranzke@googlemail.com>
29 #define _DEFAULT_SOURCE
37 #include <sys/types.h>
46 #define ARRAY_SIZE(a) (sizeof(a)/sizeof((a)[0]))
48 static struct gbm_device
*devices
[16];
50 static int device_num
= 0;
52 /** Returns the file description for the gbm device
54 * \return The fd that the struct gbm_device was created with
57 gbm_device_get_fd(struct gbm_device
*gbm
)
62 /* FIXME: maybe superfluous, use udev subclass from the fd? */
63 /** Get the backend name for the given gbm device
65 * \return The backend name string - this belongs to the device and must not
68 GBM_EXPORT
const char *
69 gbm_device_get_backend_name(struct gbm_device
*gbm
)
74 /** Test if a format is supported for a given set of usage flags.
76 * \param gbm The created buffer manager
77 * \param format The format to test
78 * \param usage A bitmask of the usages to test the format against
79 * \return 1 if the format is supported otherwise 0
81 * \sa enum gbm_bo_flags for the list of flags that the format can be
84 * \sa enum gbm_bo_format for the list of formats
87 gbm_device_is_format_supported(struct gbm_device
*gbm
,
88 uint32_t format
, uint32_t usage
)
90 return gbm
->is_format_supported(gbm
, format
, usage
);
93 /** Destroy the gbm device and free all resources associated with it.
95 * \param gbm The device created using gbm_create_device()
98 gbm_device_destroy(struct gbm_device
*gbm
)
101 if (gbm
->refcount
== 0)
106 _gbm_mesa_get_device(int fd
)
108 struct gbm_device
*gbm
= NULL
;
113 if (fd
< 0 || fstat(fd
, &buf
) < 0 || !S_ISCHR(buf
.st_mode
)) {
118 for (i
= 0; i
< device_num
; ++i
) {
119 dev
= devices
[i
]->stat
.st_rdev
;
120 if (major(dev
) == major(buf
.st_rdev
) &&
121 minor(dev
) == minor(buf
.st_rdev
)) {
131 /** Create a gbm device for allocating buffers
133 * The file descriptor passed in is used by the backend to communicate with
134 * platform for allocating the memory. For allocations using DRI this would be
135 * the file descriptor returned when opening a device such as \c
138 * \param fd The file descriptor for an backend specific device
139 * \return The newly created struct gbm_device. The resources associated with
140 * the device should be freed with gbm_device_destroy() when it is no longer
141 * needed. If the creation of the device failed NULL will be returned.
143 GBM_EXPORT
struct gbm_device
*
144 gbm_create_device(int fd
)
146 struct gbm_device
*gbm
= NULL
;
149 if (fd
< 0 || fstat(fd
, &buf
) < 0 || !S_ISCHR(buf
.st_mode
)) {
155 memset(devices
, 0, sizeof devices
);
157 gbm
= _gbm_create_device(fd
);
161 gbm
->dummy
= gbm_create_device
;
165 if (device_num
< ARRAY_SIZE(devices
)-1)
166 devices
[device_num
++] = gbm
;
171 /** Get the width of the buffer object
173 * \param bo The buffer object
174 * \return The width of the allocated buffer object
177 GBM_EXPORT
unsigned int
178 gbm_bo_get_width(struct gbm_bo
*bo
)
183 /** Get the height of the buffer object
185 * \param bo The buffer object
186 * \return The height of the allocated buffer object
188 GBM_EXPORT
unsigned int
189 gbm_bo_get_height(struct gbm_bo
*bo
)
194 /** Get the stride of the buffer object
196 * This is calculated by the backend when it does the allocation in
199 * \param bo The buffer object
200 * \return The stride of the allocated buffer object in bytes
203 gbm_bo_get_stride(struct gbm_bo
*bo
)
208 /** Get the format of the buffer object
210 * The format of the pixels in the buffer.
212 * \param bo The buffer object
213 * \return The format of buffer object, on of the GBM_FORMAT_* codes
216 gbm_bo_get_format(struct gbm_bo
*bo
)
221 /** Get the handle of the buffer object
223 * This is stored in the platform generic union gbm_bo_handle type. However
224 * the format of this handle is platform specific.
226 * \param bo The buffer object
227 * \return Returns the handle of the allocated buffer object
229 GBM_EXPORT
union gbm_bo_handle
230 gbm_bo_get_handle(struct gbm_bo
*bo
)
235 /** Get a DMA-BUF file descriptor for the buffer object
237 * This function creates a DMA-BUF (also known as PRIME) file descriptor
238 * handle for the buffer object. Eeach call to gbm_bo_get_fd() returns a new
239 * file descriptor and the caller is responsible for closing the file
242 * \param bo The buffer object
243 * \return Returns a file descriptor referring to the underlying buffer
246 gbm_bo_get_fd(struct gbm_bo
*bo
)
248 return bo
->gbm
->bo_get_fd(bo
);
252 /** Write data into the buffer object
254 * If the buffer object was created with the GBM_BO_USE_WRITE flag,
255 * this function can used to write data into the buffer object. The
256 * data is copied directly into the object and it's the responsiblity
257 * of the caller to make sure the data represents valid pixel data,
258 * according to the width, height, stride and format of the buffer object.
260 * \param bo The buffer object
261 * \param buf The data to write
262 * \param count The number of bytes to write
263 * \return Returns 0 on success, otherwise -1 is returned an errno set
266 gbm_bo_write(struct gbm_bo
*bo
, const void *buf
, size_t count
)
268 return bo
->gbm
->bo_write(bo
, buf
, count
);
271 /** Get the gbm device used to create the buffer object
273 * \param bo The buffer object
274 * \return Returns the gbm device with which the buffer object was created
276 GBM_EXPORT
struct gbm_device
*
277 gbm_bo_get_device(struct gbm_bo
*bo
)
282 /** Set the user data associated with a buffer object
284 * \param bo The buffer object
285 * \param data The data to associate to the buffer object
286 * \param destroy_user_data A callback (which may be %NULL) that will be
287 * called prior to the buffer destruction
290 gbm_bo_set_user_data(struct gbm_bo
*bo
, void *data
,
291 void (*destroy_user_data
)(struct gbm_bo
*, void *))
293 bo
->user_data
= data
;
294 bo
->destroy_user_data
= destroy_user_data
;
297 /** Get the user data associated with a buffer object
299 * \param bo The buffer object
300 * \return Returns the user data associated with the buffer object or %NULL
301 * if no data was associated with it
303 * \sa gbm_bo_set_user_data()
306 gbm_bo_get_user_data(struct gbm_bo
*bo
)
308 return bo
->user_data
;
312 * Destroys the given buffer object and frees all resources associated with
315 * \param bo The buffer object
318 gbm_bo_destroy(struct gbm_bo
*bo
)
320 if (bo
->destroy_user_data
)
321 bo
->destroy_user_data(bo
, bo
->user_data
);
323 bo
->gbm
->bo_destroy(bo
);
327 * Allocate a buffer object for the given dimensions
329 * \param gbm The gbm device returned from gbm_create_device()
330 * \param width The width for the buffer
331 * \param height The height for the buffer
332 * \param format The format to use for the buffer
333 * \param usage The union of the usage flags for this buffer
335 * \return A newly allocated buffer that should be freed with gbm_bo_destroy()
336 * when no longer needed. If an error occurs during allocation %NULL will be
337 * returned and errno set.
339 * \sa enum gbm_bo_format for the list of formats
340 * \sa enum gbm_bo_flags for the list of usage flags
342 GBM_EXPORT
struct gbm_bo
*
343 gbm_bo_create(struct gbm_device
*gbm
,
344 uint32_t width
, uint32_t height
,
345 uint32_t format
, uint32_t usage
)
347 if (width
== 0 || height
== 0) {
352 return gbm
->bo_create(gbm
, width
, height
, format
, usage
);
356 * Create a gbm buffer object from an foreign object
358 * This function imports a foreign object and creates a new gbm bo for it.
359 * This enabled using the foreign object with a display API such as KMS.
360 * Currently two types of foreign objects are supported, indicated by the type
363 * GBM_BO_IMPORT_WL_BUFFER
364 * GBM_BO_IMPORT_EGL_IMAGE
367 * The the gbm bo shares the underlying pixels but its life-time is
368 * independent of the foreign object.
370 * \param gbm The gbm device returned from gbm_create_device()
371 * \param gbm The type of object we're importing
372 * \param gbm Pointer to the external object
373 * \param usage The union of the usage flags for this buffer
375 * \return A newly allocated buffer object that should be freed with
376 * gbm_bo_destroy() when no longer needed. On error, %NULL is returned
379 * \sa enum gbm_bo_flags for the list of usage flags
381 GBM_EXPORT
struct gbm_bo
*
382 gbm_bo_import(struct gbm_device
*gbm
,
383 uint32_t type
, void *buffer
, uint32_t usage
)
385 return gbm
->bo_import(gbm
, type
, buffer
, usage
);
389 * Allocate a surface object
391 * \param gbm The gbm device returned from gbm_create_device()
392 * \param width The width for the surface
393 * \param height The height for the surface
394 * \param format The format to use for the surface
396 * \return A newly allocated surface that should be freed with
397 * gbm_surface_destroy() when no longer needed. If an error occurs
398 * during allocation %NULL will be returned.
400 * \sa enum gbm_bo_format for the list of formats
402 GBM_EXPORT
struct gbm_surface
*
403 gbm_surface_create(struct gbm_device
*gbm
,
404 uint32_t width
, uint32_t height
,
405 uint32_t format
, uint32_t flags
)
407 return gbm
->surface_create(gbm
, width
, height
, format
, flags
);
411 * Destroys the given surface and frees all resources associated with
414 * All buffers locked with gbm_surface_lock_front_buffer() should be
415 * released prior to calling this function.
417 * \param surf The surface
420 gbm_surface_destroy(struct gbm_surface
*surf
)
422 surf
->gbm
->surface_destroy(surf
);
426 * Lock the surface's current front buffer
428 * Lock rendering to the surface's current front buffer until it is
429 * released with gbm_surface_release_buffer().
431 * This function must be called exactly once after calling
432 * eglSwapBuffers. Calling it before any eglSwapBuffer has happened
433 * on the surface or two or more times after eglSwapBuffers is an
434 * error. A new bo representing the new front buffer is returned. On
435 * multiple invocations, all the returned bos must be released in
436 * order to release the actual surface buffer.
438 * \param surf The surface
440 * \return A buffer object that should be released with
441 * gbm_surface_release_buffer() when no longer needed. The implementation
442 * is free to reuse buffers released with gbm_surface_release_buffer() so
443 * this bo should not be destroyed using gbm_bo_destroy(). If an error
444 * occurs this function returns %NULL.
446 GBM_EXPORT
struct gbm_bo
*
447 gbm_surface_lock_front_buffer(struct gbm_surface
*surf
)
449 return surf
->gbm
->surface_lock_front_buffer(surf
);
453 * Release a locked buffer obtained with gbm_surface_lock_front_buffer()
455 * Returns the underlying buffer to the gbm surface. Releasing a bo
456 * will typically make gbm_surface_has_free_buffer() return 1 and thus
457 * allow rendering the next frame, but not always. The implementation
458 * may choose to destroy the bo immediately or reuse it, in which case
459 * the user data associated with it is unchanged.
461 * \param surf The surface
462 * \param bo The buffer object
465 gbm_surface_release_buffer(struct gbm_surface
*surf
, struct gbm_bo
*bo
)
467 surf
->gbm
->surface_release_buffer(surf
, bo
);
471 * Return whether or not a surface has free (non-locked) buffers
473 * Before starting a new frame, the surface must have a buffer
474 * available for rendering. Initially, a gbm surface will have a free
475 * buffer, but after one of more buffers have been locked (\sa
476 * gbm_surface_lock_front_buffer()), the application must check for a
477 * free buffer before rendering.
479 * If a surface doesn't have a free buffer, the application must
480 * return a buffer to the surface using gbm_surface_release_buffer()
481 * and after that, the application can query for free buffers again.
483 * \param surf The surface
484 * \return 1 if the surface has free buffers, 0 otherwise
487 gbm_surface_has_free_buffers(struct gbm_surface
*surf
)
489 return surf
->gbm
->surface_has_free_buffers(surf
);