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Name
ANDROID_image_native_buffer
Name Strings
EGL_ANDROID_image_native_buffer
Contributors
Mathias Agopian
Jamie Gennis
Jesse Hall
Contact
Jesse Hall, Google Inc. (jessehall 'at' google.com)
Status
Complete
Version
Version 1, November 28, 2012
Number
EGL Extension #49
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
This extension enables using an Android window buffer (struct
ANativeWindowBuffer) as an EGLImage source.
New Types
None.
New Procedures and Functions
None.
New Tokens
Accepted by the <target> parameter of eglCreateImageKHR:
EGL_NATIVE_BUFFER_ANDROID 0x3140
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_BUFFER_ANDROID | Used for ANativeWindowBuffer objects |
+----------------------------+-----------------------------------------+
Table aaa. Legal values for eglCreateImageKHR <target> parameter
...
If <target> is EGL_NATIVE_BUFFER_ANDROID, <dpy> must be a valid display,
<ctx> must be EGL_NO_CONTEXT, <buffer> must be a pointer to a valid
ANativeWindowBuffer 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_BUFFER_ANDROID and <buffer> is not a
pointer to a valid ANativeWindowBuffer, the error EGL_BAD_PARAMETER
is generated.
* If <target> is EGL_NATIVE_BUFFER_ANDROID and <ctx> is not
EGL_NO_CONTEXT, the error EGL_BAD_CONTEXT is generated.
* If <target> is EGL_NATIVE_BUFFER_ANDROID 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 ANativeWindowBuffer
properties implementations are required to support?
RESOLVED: No.
The requirements have evolved over time and will continue to change with
future Android releases. The minimum requirements for a given Android
version should be documented by that version.
Revision History
#1 (Jesse Hall, November 28, 2012)
- Initial draft.
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