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Name
MESA_texture_const_bandwidth
Name Strings
GL_MESA_texture_const_bandwidth
Contact
Rob Clark <robdclark@chromium.org>
Contributors
Rob Clark, Google
Lina Versace, Google
Tapani Pälli, Intel
Status
Proposal
Version
Version 1, September, 2023
Number
tbd
Dependencies
Requires EXT_memory_object.
Overview
The use of data dependent bandwidth compressed formats (UBWC, AFBC, etc)
can introduce a form of side-channel, in that the bandwidth used for
texture access is dependent on the texture's contents. In some cases
an application may want to disable the use of data dependent formats on
specific textures.
For that purpose, this extension extends EXT_memory_object to introduce
a new <param> CONST_BW_TILING_MESA.
IP Status
None
Issues
None
New Procedures and Functions
None
New Types
None
New Tokens
Returned in the <params> parameter of GetInternalFormativ or
GetInternalFormati64v when the <pname> parameter is TILING_TYPES_EXT,
returned in the <params> parameter of GetTexParameter{if}v,
GetTexParameterI{i ui}v, GetTextureParameter{if}v, and
GetTextureParameterI{i ui}v when the <pname> parameter is
TEXTURE_TILING_EXT, and accepted by the <params> parameter of
TexParameter{ifx}{v}, TexParameterI{i ui}v, TextureParameter{if}{v},
TextureParameterI{i ui}v when the <pname> parameter is
TEXTURE_TILING_EXT:
CONST_BW_TILING_MESA 0x8BBE
Errors
None
Revision History
Version 1, 2023-9-28 (Rob Clark)
Initial draft.
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