Adaptive scalable texture compression: Difference between revisions

Revision as of 19:30, 28 March 2015

Revision as of 14:11, 20 May 2015

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Despite this flexibility, ASTC achieves better peak signal-to-noise ratios than [[PVRTC]], [[S3TC]], and [[Ericsson Texture Compression|ETC2]] when measured at 2 and 3.56 bits per texel. For HDR textures, it produces results comparable to BC6H at 8 bits per texel.

== Supported Colorcolor Formatsformats ==

{| class="wikitable"

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Each of these may be encoded as low or high dynamic range. The encoder selects color formats independently for each block in the image.

== 2D Blockblock Footprintsfootprints and Bitbit Ratesrates ==

ASTC textures are compressed using a fixed block size of 128 bits, but with a variable block footprint ranging from 4x4 texels up to 12x12 texels. The available bit rates thus range from 8 bits per texel down to 0.89 bits per texel, with fine steps in between.

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In the above table, the "Increment" column shows the additional storage required to store a texture using this bit rate, as compared to the next smallest. Block footprints are presented as width x height.

== 3D Blockblock Footprintsfootprints and Bitbit Ratesrates ==

ASTC 3D textures are compressed using a fixed block size of 128 bits, as for 2D but with a variable block footprint ranging from 3x3x3 texels up to 6x6x6 texels. The available bit rates thus range from 4.74 bits per texel down to 0.59 bits per texel, with fine steps in between.

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Block footprints are presented as width x height x depth.

== See also ==

* [[3Dc]]

* [[Ericsson Texture Compression]] (ETC)

* [[PVRTC]]

* [[S3TC]]

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== External links ==

* [http://www.highperformancegraphics.org/ High Performance Graphics 2012]

* [http://community.arm.com/groups/arm-mali-graphics/blog/2011/12/13/astc-texture-compression-arm-pushes-the-envelope-in-graphics-technology/ ASTC Texture Compression: ARM Pushes the Envelope in Graphics Technology]

* [http://community.arm.com/groups/arm-mali-graphics/blog/2012/06/28/arm-unveils-details-of-astc-texture-compression-at-hpg-conference--part-1/ ARM Unveils Details of ASTC Texture Compression at HPG Conference]

* [http://malideveloper.arm.com/develop-for-mali/tools/astc-evaluation-codec/ ASTC Evaluation Codec from ARM]

* [http://www.khronos.org/registry/gles/extensions/OES/OES_texture_compression_astc.txt Khronos ASTC Full Profile Extension Specification]

[[Category:Lossy compression algorithms]]