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Name
NV_stream_fifo_next
Name Strings
EGL_NV_stream_fifo_next
Contributors
Daniel Kartch
Miguel A. Vico
Contacts
Daniel Kartch, NVIDIA (dkartch 'at' nvidia.com)
Status
Draft
Version
Version 3 - October 27, 2016
Number
EGL Extension #110
Extension Type
EGL display extension
Dependencies
Requires EGL_KHR_stream_fifo
Overview
When operating on a FIFO stream, a consumer may need to know the
timestamp associated with the next frame in the stream before
deciding whether to acquire it or reuse the previous frame. In the
case of a FIFO size of 1, the EGL_STREAM_TIME_PRODUCER_KHR attribute
is sufficient to determine this. However, when the size is greater
than 1, there may be frames available with earlier time stamps than
the one most recently inserted by the producer. This extension
enables querying of the next pending frame in a stream.
New Types
None
New Functions
None
New Tokens
Accepted as the <attribute> parameter of eglQueryStreamu64KHR
EGL_PENDING_FRAME_NV 0x3329
Accepted as the <attribute> parameter of eglQueryStreamTimeKHR
EGL_STREAM_TIME_PENDING_NV 0x332A
Add to "Table 3.10.4.4 EGLStream Attributes" in the EGL_KHR_stream
extension spec:
Attribute Read/Write Type Section
-------------------------- ---------- ------------ --------
EGL_PENDING_FRAME_NV ro EGLuint64KHR 3.10.4.x
EGL_STREAM_TIME_PENDING_NV ro EGLTimeKHR 3.10.4.y
Add new subsections to section "3.10.4 EGLStream Attributes" in the
EGL_KHR_stream extension spec
3.10.4.x EGL_PENDING_FRAME_NV Attribute
The EGL_PENDING_FRAME_NV attribute indicates the frame number of the
image frame that would be obtained if an acquire operation were
performed at the time of the query. This is the value that
EGL_PRODUCER_FRAME_KHR contained just after this image frame was
inserted into the stream.
3.10.4.y EGL_STREAM_TIME_PENDING_NV Attribute
The EGL_STREAM_TIME_PENDING_NV attribute indicates the timestamp of
the image frame that would be obtained if an acquire operation were
performed at the time of the query.
Issues
None
Revision History
#3 (October 27, 2016) Daniel Kartch
- Clean up for publication
#2 (April 2nd, 2015) Miguel A. Vico
- Assigned enumerated values for constants.
#1 (March 20th, 2015) Daniel Kartch
- Initial draft
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