KTX

KTX
Developer(s)	Khronos Group
Stable release	2.0.0 / April 18, 2021; 3 years ago
Repository	www.khronos.org/registry/KTX/
Engine
Operating system	Cross-platform
Platform	Cross-platform
Type	GPU Texture Fiel Format
License	Apache License 2.0
Website	www.khronos.org/ktx/

Script error: No such module "AfC submission catcheck". Script error: No such module "AfC submission catcheck".

Search KTX on Amazon.

KTX (Khronos TeXtures) is an open, royalty-free cross-platform container file format for distributing GPU textures. The contents of a KTX file can range from a simple base-level 2D texture to a cubemap array texture with mipmaps. KTX files hold all the parameters needed for efficient texture loading into 3D APIs such as OpenGL and Vulkan. It is developed by a working group managed by the Khronos Group consortium.

History[edit]

KTX 1.0 was released on 22nd December 2018. In April 2021 the KTX 2.0^[1] specification was released, adding support for Basis Universal supercompressed textures, plus set of open source tools for creating, validating and inspecting KTX files. Basis Universal is a codec that produces compact textures that can be efficiently transcoded to a variety of GPU compressed texture formats at run-time. basis_universal ^[2] was developed by Binomial and is hosted on gitHub under an Apache 2 license.

Uses[edit]

To be completed - reference to glTF and other use cases.

Syntax[edit]

Basic File Structure

Byte[12] identifier
UInt32 vkFormat
UInt32 typeSize
UInt32 pixelWidth
UInt32 pixelHeight
UInt32 pixelDepth
UInt32 layerCount
UInt32 faceCount
UInt32 levelCount
UInt32 supercompressionScheme

// Index 
UInt32 dfdByteOffset
UInt32 dfdByteLength
UInt32 kvdByteOffset
UInt32 kvdByteLength
UInt64 sgdByteOffset
UInt64 sgdByteLength
// Level Index 
struct {
    UInt64 byteOffset
    UInt64 byteLength
    UInt64 uncompressedByteLength
} levels[max(1, levelCount)]

// Data Format Descriptor 
UInt32 dfdTotalSize
continue
    dfDescriptorBlock dfdBlock
          ︙
until dfdByteLength read

// Key/Value Data 
continue
    UInt32   keyAndValueByteLength
    Byte     keyAndValue[keyAndValueByteLength]
    align(4) valuePadding 
                    ︙
until kvdByteLength read
if (sgdByteLength > 0)
    align(8) sgdPadding

// Supercompression Global Data 
Byte supercompressionGlobalData[sgdByteLength]

// Mip Level Array 
for each mip_level in levelCount 
    Byte     levelImages[bytesOfLevelImages] 
end

Motivation[edit]

To be completed

Comparison with other formats[edit]

To be completed

References[edit]

This article "KTX" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:KTX. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.

[1] "Khronos standardizes texture compression in KTX 2.0".

[2] "Basis Universal Supercompressed GPU Texture Codec".

[1]

[2]

KTX

Contents