extensions/TIZEN/EGL_TIZEN_image_native_surface.txt

Name

    TIZEN_image_native_surface

Name Strings

    EGL_TIZEN_image_native_surface

Contributors

    Dongyeon Kim
    Zeeshan Anwar
    Minsu Han
    Inpyo Kang

Contact

    Dongyeon Kim, Samsung Electronics (dy5.kim 'at' samsung.com)
    Zeeshan Anwar, Samsung Electronics (z.anwar 'at' samsung.com)

Status

    Complete

Version

    Version 3, August 13, 2014

Number

    EGL Extension #77

Dependencies

    EGL 1.2 is required.

    EGL_KHR_image_base is required.

    This extension is written against the wording of the EGL 1.2
    Specification.

Overview

    Tizen Buffer Manager (TBM) is a user space, generic memory 
    management  framework to create and share memory buffers between 
    different system components. This extension enables using a Tizen 
    Buffer Manager (TBM) surface object (struct tbm_surface_h) as an 
    EGLImage source.

New Types

    None.

New Procedures and Functions

    None.

New Tokens

    Accepted by the <target> parameter of eglCreateImageKHR:

    EGL_NATIVE_SURFACE_TIZEN            0x32A1

Changes to Chapter 3 of the EGL 1.2 Specification (EGL Functions and Errors)

    Add to section 2.5.1 "EGLImage Specification" (as defined by the
    EGL_KHR_image_base specification), in the description of
    eglCreateImageKHR:

   "Values accepted for <target> are listed in Table aaa, below.

      +---------------------------+------------------------------------+
      |  <target>                 | Notes                              |
      +---------------------------+------------------------------------+
      |  EGL_NATIVE_SURFACE_TIZEN | Used for Tizen tbm_surface_h objects |
      +---------------------------+------------------------------------+
       Table aaa.  Legal values for eglCreateImageKHR <target> parameter

    ...

    If <target> is EGL_NATIVE_SURFACE_TIZEN, <dpy> must be a valid 
    display, <ctx> must be EGL_NO_CONTEXT, <buffer> must be a pointer 
    to a valid tbm_surface_h object (cast into the type EGLClientBuffer), 
    and attributes other than EGL_IMAGE_PRESERVED_KHR are ignored."

    Add to the list of error conditions for eglCreateImageKHR:

      "* If <target> is EGL_NATIVE_SURFACE_TIZEN and <buffer> is not 
         a pointer to a valid tbm_surface_h, the error EGL_BAD_PARAMETER
         is generated.

       * If <target> is EGL_NATIVE_SURFACE_TIZEN and <ctx> is not
         EGL_NO_CONTEXT, the error EGL_BAD_CONTEXT is generated.

       * If <target> is EGL_NATIVE_SURFACE_TIZEN and <buffer> was 
         created with properties (format, usage, dimensions, etc.) not 
         supported by the EGL implementation, the error 
         EGL_BAD_PARAMETER is generated."

Issues

    1. Should this extension define what combinations of tbm_surface_h
    properties implementations are required to support?

    RESOLVED: No.

    The requirements have evolved over time and will continue to change 
    with future Tizen releases. The minimum requirements for a given 
    Tizen version should be documented by that version.


Revision History
#3 (Zeeshan Anwar, August 13, 2014)
   - Changed tbm_surface to tbm_surface_h
   
#2 (Zeeshan Anwar, July 23, 2014)
   - Changed extension name and target name
   - Assigned value to EGL_NATIVE_SURFACE_TIZEN
   
#1 (Zeeshan Anwar, July 18, 2014)
   - Initial draft.