119 lines
5.9 KiB
Plaintext
119 lines
5.9 KiB
Plaintext
// Copyright (c) 2015-2016 The Khronos Group Inc.
|
|
// Copyright notice at https://www.khronos.org/registry/speccopyright.html
|
|
|
|
[appendix]
|
|
= Compressed Image Formats
|
|
|
|
The compressed texture formats used by Vulkan are described in the
|
|
specifically identified sections of the <<Khronos Data Format
|
|
Specification>>, version 1.1.
|
|
|
|
Unless otherwise described, the quantities encoded in these compressed
|
|
formats are treated as normalized, unsigned values.
|
|
|
|
Those formats listed as sRGB-encoded have in-memory representations of
|
|
_R_, _G_ and _B_ components which are nonlinearly-encoded as
|
|
latexmath:[$R'$], latexmath:[$G'$], and latexmath:[$B'$]; any alpha
|
|
component is unchanged. As part of filtering, the nonlinear
|
|
latexmath:[$R'$], latexmath:[$G'$], and latexmath:[$B'$] values are
|
|
converted to linear _R_, _G_, and _B_ components; any alpha component is
|
|
unchanged. The conversion between linear and nonlinear encoding is performed
|
|
as described in the ``KHR_DF_TRANSFER_SRGB'' section of the Khronos Data
|
|
Format Specification.
|
|
|
|
<<<
|
|
|
|
[[appendix-compressedtex-bc]]
|
|
== Block-Compressed Image Formats
|
|
|
|
.Mapping of Vulkan BC formats to descriptions
|
|
[width="90%",options="header",cols="5,4"]
|
|
|==============================
|
|
| VkFormat | Data Format Specification description
|
|
2+^| Formats described in the ``S3TC Compressed Texture Image Formats'' chapter
|
|
| ename:VK_FORMAT_BC1_RGB_UNORM_BLOCK |BC1 with no alpha
|
|
| ename:VK_FORMAT_BC1_RGB_SRGB_BLOCK |BC1 with no alpha, sRGB-encoded
|
|
| ename:VK_FORMAT_BC1_RGBA_UNORM_BLOCK|BC1 with alpha
|
|
| ename:VK_FORMAT_BC1_RGBA_SRGB_BLOCK |BC1 with alpha, sRGB-encoded
|
|
| ename:VK_FORMAT_BC2_UNORM_BLOCK |BC2
|
|
| ename:VK_FORMAT_BC2_SRGB_BLOCK |BC2, sRGB-encoded
|
|
| ename:VK_FORMAT_BC3_UNORM_BLOCK |BC3
|
|
| ename:VK_FORMAT_BC3_SRGB_BLOCK |BC3, sRGB-encoded
|
|
2+^| Formats described in the ``RGTC Compressed Texture Image Formats'' chapter
|
|
| ename:VK_FORMAT_BC4_UNORM_BLOCK |BC4 unsigned
|
|
| ename:VK_FORMAT_BC4_SNORM_BLOCK |BC4 signed
|
|
| ename:VK_FORMAT_BC5_UNORM_BLOCK |BC5 unsigned
|
|
| ename:VK_FORMAT_BC5_SNORM_BLOCK |BC5 signed
|
|
2+^| Formats described in the ``BPTC Compressed Texture Image Formats'' chapter
|
|
| ename:VK_FORMAT_BC6H_UFLOAT_BLOCK |BC6H (unsigned version)
|
|
| ename:VK_FORMAT_BC6H_SFLOAT_BLOCK |BC6H (signed version)
|
|
| ename:VK_FORMAT_BC7_UNORM_BLOCK |BC7
|
|
| ename:VK_FORMAT_BC7_SRGB_BLOCK |BC7, sRGB-encoded
|
|
|=============================
|
|
|
|
<<<
|
|
|
|
[[appendix-compressedtex-etc2]]
|
|
== ETC Compressed Image Formats
|
|
|
|
The following formats are described in the ``ETC2 Compressed Texture Image
|
|
Formats'' chapter of the Khronos Data Format Specification.
|
|
|
|
.Mapping of Vulkan ETC formats to descriptions
|
|
[options="header",cols="1,1"]
|
|
|==============================
|
|
| VkFormat | Data Format Specification description
|
|
| ename:VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK |RGB ETC2
|
|
| ename:VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK |RGB ETC2 with sRGB encoding
|
|
| ename:VK_FORMAT_ETC2_R8G8B8A1_UNORM_BLOCK |RGB ETC2 with punchthrough alpha
|
|
| ename:VK_FORMAT_ETC2_R8G8B8A1_SRGB_BLOCK |RGB ETC2 with punchthrough alpha and sRGB
|
|
| ename:VK_FORMAT_ETC2_R8G8B8A8_UNORM_BLOCK |RGBA ETC2
|
|
| ename:VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK |RGBA ETC2 with sRGB encoding
|
|
| ename:VK_FORMAT_EAC_R11_UNORM_BLOCK |Unsigned R11 EAC
|
|
| ename:VK_FORMAT_EAC_R11_SNORM_BLOCK |Signed R11 EAC
|
|
| ename:VK_FORMAT_EAC_R11G11_UNORM_BLOCK |Unsigned RG11 EAC
|
|
| ename:VK_FORMAT_EAC_R11G11_SNORM_BLOCK |Signed RG11 EAC
|
|
|=============================
|
|
|
|
<<<
|
|
|
|
[[appendix-compressedtex-astc]]
|
|
== ASTC Compressed Image Formats
|
|
|
|
ASTC formats are described in the ``ASTC Compressed Texture Image Formats''
|
|
chapter of the Khronos Data Format Specification.
|
|
|
|
.Mapping of Vulkan ASTC formats to descriptions
|
|
[width="75%",options="header",cols="63%,15%,22%"]
|
|
|==============================
|
|
| VkFormat ^| Compressed texel block dimensions ^| sRGB-encoded
|
|
| ename:VK_FORMAT_ASTC_4x4_UNORM_BLOCK ^|latexmath:[$4\times 4$] ^|No
|
|
| ename:VK_FORMAT_ASTC_4x4_SRGB_BLOCK ^|latexmath:[$4\times 4$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_5x4_UNORM_BLOCK ^|latexmath:[$5\times 4$] ^|No
|
|
| ename:VK_FORMAT_ASTC_5x4_SRGB_BLOCK ^|latexmath:[$5\times 4$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_5x5_UNORM_BLOCK ^|latexmath:[$5\times 5$] ^|No
|
|
| ename:VK_FORMAT_ASTC_5x5_SRGB_BLOCK ^|latexmath:[$5\times 5$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_6x5_UNORM_BLOCK ^|latexmath:[$6\times 5$] ^|No
|
|
| ename:VK_FORMAT_ASTC_6x5_SRGB_BLOCK ^|latexmath:[$6\times 5$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_6x6_UNORM_BLOCK ^|latexmath:[$6\times 6$] ^|No
|
|
| ename:VK_FORMAT_ASTC_6x6_SRGB_BLOCK ^|latexmath:[$6\times 6$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_8x5_UNORM_BLOCK ^|latexmath:[$8\times 5$] ^|No
|
|
| ename:VK_FORMAT_ASTC_8x5_SRGB_BLOCK ^|latexmath:[$8\times 5$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_8x6_UNORM_BLOCK ^|latexmath:[$8\times 6$] ^|No
|
|
| ename:VK_FORMAT_ASTC_8x6_SRGB_BLOCK ^|latexmath:[$8\times 6$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_8x8_UNORM_BLOCK ^|latexmath:[$8\times 8$] ^|No
|
|
| ename:VK_FORMAT_ASTC_8x8_SRGB_BLOCK ^|latexmath:[$8\times 8$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_10x5_UNORM_BLOCK ^|latexmath:[$10\times 5$] ^|No
|
|
| ename:VK_FORMAT_ASTC_10x5_SRGB_BLOCK ^|latexmath:[$10\times 5$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_10x6_UNORM_BLOCK ^|latexmath:[$10\times 6$] ^|No
|
|
| ename:VK_FORMAT_ASTC_10x6_SRGB_BLOCK ^|latexmath:[$10\times 6$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_10x8_UNORM_BLOCK ^|latexmath:[$10\times 8$] ^|No
|
|
| ename:VK_FORMAT_ASTC_10x8_SRGB_BLOCK ^|latexmath:[$10\times 8$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_10x10_UNORM_BLOCK ^|latexmath:[$10\times 10$] ^|No
|
|
| ename:VK_FORMAT_ASTC_10x10_SRGB_BLOCK ^|latexmath:[$10\times 10$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_12x10_UNORM_BLOCK ^|latexmath:[$12\times 10$] ^|No
|
|
| ename:VK_FORMAT_ASTC_12x10_SRGB_BLOCK ^|latexmath:[$12\times 10$] ^|Yes
|
|
| ename:VK_FORMAT_ASTC_12x12_UNORM_BLOCK ^|latexmath:[$12\times 12$] ^|No
|
|
| ename:VK_FORMAT_ASTC_12x12_SRGB_BLOCK ^|latexmath:[$12\times 12$] ^|Yes
|
|
|==============================
|