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d0c81e12f3
A simple extension that builds on EXT_memory_object to allow the application to request that constant bandwidth (non-data-dependent) tiling layouts be used for a specified texture. Signed-off-by: Rob Clark <robdclark@chromium.org> Reviewed-by: Marek Olšák <marek.olsak@amd.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25464>
83 lines
1.6 KiB
Python
83 lines
1.6 KiB
Python
Name
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MESA_texture_const_bandwidth
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Name Strings
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GL_MESA_texture_const_bandwidth
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Contact
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Rob Clark <robdclark@chromium.org>
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Contributors
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Rob Clark, Google
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Lina Versace, Google
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Tapani Pälli, Intel
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Status
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Proposal
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Version
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Version 1, September, 2023
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Number
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tbd
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Dependencies
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Requires EXT_memory_object.
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Overview
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The use of data dependent bandwidth compressed formats (UBWC, AFBC, etc)
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can introduce a form of side-channel, in that the bandwidth used for
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texture access is dependent on the texture's contents. In some cases
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an application may want to disable the use of data dependent formats on
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specific textures.
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For that purpose, this extension extends EXT_memory_object to introduce
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a new <param> CONST_BW_TILING_MESA.
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IP Status
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None
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Issues
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None
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New Procedures and Functions
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None
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New Types
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None
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New Tokens
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Returned in the <params> parameter of GetInternalFormativ or
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GetInternalFormati64v when the <pname> parameter is TILING_TYPES_EXT,
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returned in the <params> parameter of GetTexParameter{if}v,
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GetTexParameterI{i ui}v, GetTextureParameter{if}v, and
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GetTextureParameterI{i ui}v when the <pname> parameter is
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TEXTURE_TILING_EXT, and accepted by the <params> parameter of
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TexParameter{ifx}{v}, TexParameterI{i ui}v, TextureParameter{if}{v},
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TextureParameterI{i ui}v when the <pname> parameter is
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TEXTURE_TILING_EXT:
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CONST_BW_TILING_MESA 0x8BBE
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Errors
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None
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Revision History
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Version 1, 2023-9-28 (Rob Clark)
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Initial draft.
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