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80 lines
2.1 KiB
80 lines
2.1 KiB
1 year ago
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/*
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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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