[Mesa-dev] [v2] EXT_image_dma_buf_import for intel

[Topi Pohjolainen]

The set introduces new target for 'eglCreateImageKHR()' allowing one
to create EGL images out of externally allocated buffers. Especially
one can combine up to three separate buffers into one single logical
entity. Low level native buffers may not support planar formats and
hence EGL layer will instead combine native buffers each representing
a single plane into one planar image.

Until now an image in intel dri backend consisted of a single region.
Here this is extended to accomodate YUV formats having each component
in its own plane, but intended only for images that are to be bound
as textures later on.

As such the images are not much of use, but combined with the logic
(OES_external_image) allowing one to create textures out of these
images, one can start directly sampling the underlying buffers.


Extra attention should be paid to the native buffer referencing -
I chose to follow the current way where the egl driver simply tells
the native buffer management that there is another user of the
buffer. The extension itself says that:

   "3. Does ownership of the file descriptor pass to the EGL library?

    ANSWER: If eglCreateImageKHR is successful, EGL assumes ownership
    of the file descriptors and is responsible for closing them."

In case of gem originated buffers the native reference counting
already takes care of the lifecycle of the buffer objects. I wonder
if the intention here is to have something more specific.

And unfortunately I didn't dare touching gallium side of things.


v2:
   - added support for treating buffers having packed format
     separately from the planar (that require special care)
       intel: allow packed prime buffers to be treated normally

   - tried to address all Eric's comments:  
       intel: refactor planar format lookup
       intel: prepare for dri images having more than plane

   - added missing check for explicit "no context"
       egl: definitions for EXT_image_dma_buf_import

Topi Pohjolainen (10):
  intel: allow packed prime buffers to be treated normally
  intel: do not create renderbuffers out of planar images
  intel: replace single region with a vector of regions
  intel: refactor planar format lookup
  intel: set dri image dimensions even when creating out of primes
  intel: prepare for dri images having more than plane
  dri: propagate extra dma_buf import attributes to the drivers
  egl: definitions for EXT_image_dma_buf_import
  egl: dri2: support for creating images out of dma buffers
  intel: enable EXT_image_dma_buf_import

 include/EGL/eglext.h                          |  33 ++++
 include/GL/internal/dri_interface.h           |  23 +++
 src/egl/drivers/dri2/egl_dri2.c               | 239 ++++++++++++++++++++++++++
 src/egl/main/eglapi.c                         |   7 +-
 src/egl/main/egldisplay.h                     |   1 +
 src/egl/main/eglimage.c                       |  76 ++++++++
 src/egl/main/eglimage.h                       |  15 ++
 src/mesa/drivers/dri/intel/intel_extensions.c |   1 +
 src/mesa/drivers/dri/intel/intel_fbo.c        |  10 +-
 src/mesa/drivers/dri/intel/intel_regions.h    |  14 +-
 src/mesa/drivers/dri/intel/intel_screen.c     | 192 ++++++++++++++-------
 src/mesa/drivers/dri/intel/intel_tex_image.c  |   2 +-
 src/mesa/main/extensions.c                    |   1 +
 src/mesa/main/mtypes.h                        |   1 +
 14 files changed, 544 insertions(+), 71 deletions(-)

-- 
1.8.1.2