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Name
ANGLE_memory_size
Name Strings
GL_ANGLE_memory_size
Contributors
Geoff Lang
Contact
Geoff Lang (geofflang 'at' google.com)
Notice
Copyright (c) 2018 The Khronos Group Inc. Copyright terms at
http://www.khronos.org/registry/speccopyright.html
Status
Draft
Version
Version 1, November 1, 2018
Number
OpenGL ES Extension #??
Dependencies
Requires OpenGL ES 2.0
Written against the OpenGL ES 3.1 specification.
Overview
This extension allows the user to query the estimated memory internally
allocated for an OpenGL resource. This information can be useful for
determining which resources should be deleted under memory pressure.
New Procedures and Functions
None
New Tokens
Accepted by the <name> parameter of GetTexParameter*,
GetTexLevelParameter*, GetBufferParameter* and GetRenderbufferParameter*
functions:
GL_MEMORY_SIZE_ANGLE 0x93AD
Additions to the OpenGL ES 3.1 Specification
Add an entry to Table 6.2, Buffer object parameters and their values:
Name Type Initial Value Legal Values
----------------- ----- ------------- ------------------------
MEMORY_SIZE_ANGLE int64 0 any non-negative integer
Change the last sentence of the first paragraph of section 8.10.2,
Texture Parameter Queries:
- pname must be IMAGE_FORMAT_COMPATIBILITY_TYPE, TEXTURE_-
- IMMUTABLE_FORMAT, TEXTURE_IMMUTABLE_LEVELS, or one of the symbolic
- values in table 8.20.
+ pname must be IMAGE_FORMAT_COMPATIBILITY_TYPE, TEXTURE_-
+ IMMUTABLE_FORMAT, TEXTURE_IMMUTABLE_LEVELS, MEMORY_SIZE_ANGLE,
+ or one of the symbolic values in table 8.20.
Add to the end of the fifth paragraph of section 8.10.3, Texture Level
Parameter Queries:
+ queries of pname MEMORY_SIZE_ANGLE return the estimated number of bytes
+ allocated for level of the texture bound to target.
Add a new paragraph after paragraph 3 in section 9.2.6, Renderbuffer
Object Queries:
If pname is MEMORY_SIZE_ANGLE, then params will contain the esimated
number of bytes allocated for the renderbuffer bound to target.
New State
Add to Table 20.4: Buffer Object State
Get value Type Get Cmd Min Value Description Sec.
------------------- ---- --------------------- --------- ------------------------- ----
MEMORY_SIZE_ANGLE Z+ GetBufferParameter64v - Estimated bytes allocated 6
Add to Table 20.9: Textures (state per texture object)
Get value Type Get Cmd Min Value Description Sec.
------------------- ---- -------------------- --------- ------------------------- -----
MEMORY_SIZE_ANGLE Z+ GetTexParameter - Estimated bytes allocated 6.1.3
GetTexLevelParameter
Add to Table 20.16: Renderbuffer (state per renderbuffer object)
Get value Type Get Cmd Min Value Description Sec.
------------------- ---- -------------------------- --------- ------------------------- -----
MEMORY_SIZE_ANGLE Z+ GetRenderbufferParameteriv - Estimated bytes allocated 9.2.6
Interactions with the OpenGL ES 2.0 and 3.0 specifications:
Remove all references to GetTexLevelParameter and replace references to
GetBufferParameter64v with GetBufferParameteriv.
Issues
(1) Could the estimated number of bytes be specified more tightly to an
upper or lower bound?
RESOLVED: Implementations should attempt to return the lower bound on
the allocated memory if exact numbers are not known. The lower bound is
the most actionable value for making decisions when caching.
Revision History
Rev. Date Author Changes
---- ------------- --------- ----------------------------------------
1 Nov 1, 2018 geofflang Initial version
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