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79 lines
2.1 KiB
79 lines
2.1 KiB
/* |
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img_ktx2.h - ktx2 format reference |
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Copyright (C) 2023 Provod |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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*/ |
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#ifndef IMG_KTX2_H |
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#define IMG_KTX2_H |
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#include <stdint.h> |
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#define KTX2_IDENTIFIER_SIZE 12 |
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#define KTX2_IDENTIFIER "\xABKTX 20\xBB\r\n\x1A\n" |
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/* |
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static const char k_ktx2_identifier[KTX2_IDENTIFIER_SIZE] = |
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{ |
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'\xAB', 'K', 'T', 'X', ' ', '2', '0', '\xBB', '\r', '\n', '\x1A', '\n' |
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}; |
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*/ |
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typedef struct |
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{ |
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uint32_t vkFormat; |
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uint32_t typeSize; |
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uint32_t pixelWidth; |
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uint32_t pixelHeight; |
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uint32_t pixelDepth; |
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uint32_t layerCount; |
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uint32_t faceCount; |
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uint32_t levelCount; |
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uint32_t supercompressionScheme; |
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} ktx2_header_t; |
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typedef struct |
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{ |
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uint32_t dfdByteOffset; |
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uint32_t dfdByteLength; |
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uint32_t kvdByteOffset; |
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uint32_t kvdByteLength; |
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uint64_t sgdByteOffset; |
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uint64_t sgdByteLength; |
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} ktx2_index_t; |
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typedef struct |
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{ |
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uint64_t byteOffset; |
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uint64_t byteLength; |
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uint64_t uncompressedByteLength; |
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} ktx2_level_t; |
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#define KTX2_LEVELS_OFFSET ( KTX2_IDENTIFIER_SIZE + sizeof( ktx2_header_t ) + sizeof( ktx2_index_t )) |
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#define KTX2_MINIMAL_HEADER_SIZE ( KTX2_LEVELS_OFFSET + sizeof( ktx2_level_t )) |
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// These have the same values as enum VkFormat in vulkan_core.h |
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// There are hundreds of formats which can be contained in KTX2. |
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// Below are listed the ones which are supported here. This list can be extended. |
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typedef enum |
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{ |
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KTX2_FORMAT_BC4_UNORM_BLOCK = 139, |
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KTX2_FORMAT_BC4_SNORM_BLOCK = 140, |
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KTX2_FORMAT_BC5_UNORM_BLOCK = 141, |
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KTX2_FORMAT_BC5_SNORM_BLOCK = 142, |
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KTX2_FORMAT_BC6H_UFLOAT_BLOCK = 143, |
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KTX2_FORMAT_BC6H_SFLOAT_BLOCK = 144, |
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KTX2_FORMAT_BC7_UNORM_BLOCK = 145, |
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KTX2_FORMAT_BC7_SRGB_BLOCK = 146, |
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} ktx2_format_t; |
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#endif // IMG_KTX2_H
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