266 lines
7.1 KiB
C++
266 lines
7.1 KiB
C++
/* -*- tab-width: 4; -*- */
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/* vi: set sw=2 ts=4 expandtab: */
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/* $Id: e36ad79b5eac8ea237d6a05602c71aadab575519 $ */
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/*
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* Copyright 2010-2020 The Khronos Group Inc.
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* SPDX-License-Identifier: Apache-2.0
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*/
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/*
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* Author: Mark Callow from original code by Georg Kolling
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*/
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#ifndef KTXINT_H
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#define KTXINT_H
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#include <math.h>
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/* Define this to include the ETC unpack software in the library. */
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#ifndef SUPPORT_SOFTWARE_ETC_UNPACK
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/* Include for all GL versions because have seen OpenGL ES 3
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* implementaions that do not support ETC1 (ARM Mali emulator v1.0)!
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*/
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#define SUPPORT_SOFTWARE_ETC_UNPACK 1
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#endif
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#ifndef MAX
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#define MAX(x, y) (((x) > (y)) ? (x) : (y))
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#endif
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#define QUOTE(x) #x
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#define STR(x) QUOTE(x)
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#define KTX2_IDENTIFIER_REF { 0xAB, 0x4B, 0x54, 0x58, 0x20, 0x32, 0x30, 0xBB, 0x0D, 0x0A, 0x1A, 0x0A }
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#define KTX2_HEADER_SIZE (80)
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @internal
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* @brief used to pass GL context capabilites to subroutines.
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*/
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#define _KTX_NO_R16_FORMATS 0x0
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#define _KTX_R16_FORMATS_NORM 0x1
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#define _KTX_R16_FORMATS_SNORM 0x2
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#define _KTX_ALL_R16_FORMATS (_KTX_R16_FORMATS_NORM | _KTX_R16_FORMATS_SNORM)
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extern GLint _ktxR16Formats;
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extern GLboolean _ktxSupportsSRGB;
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/**
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* @internal
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* @~English
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* @brief KTX file header.
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*
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* See the KTX specification for descriptions.
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*/
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typedef struct KTX_header {
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ktx_uint8_t identifier[12];
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ktx_uint32_t endianness;
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ktx_uint32_t glType;
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ktx_uint32_t glTypeSize;
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ktx_uint32_t glFormat;
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ktx_uint32_t glInternalformat;
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ktx_uint32_t glBaseInternalformat;
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ktx_uint32_t pixelWidth;
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ktx_uint32_t pixelHeight;
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ktx_uint32_t pixelDepth;
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ktx_uint32_t numberOfArrayElements;
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ktx_uint32_t numberOfFaces;
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ktx_uint32_t numberOfMipLevels;
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ktx_uint32_t bytesOfKeyValueData;
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} KTX_header;
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/* This will cause compilation to fail if the struct size doesn't match */
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typedef int KTX_header_SIZE_ASSERT [sizeof(KTX_header) == KTX_HEADER_SIZE];
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/**
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* @internal
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* @~English
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* @brief 32-bit KTX 2 index entry.
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*/
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typedef struct ktxIndexEntry32 {
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ktx_uint32_t byteOffset; /*!< Offset of item from start of file. */
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ktx_uint32_t byteLength; /*!< Number of bytes of data in the item. */
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} ktxIndexEntry32;
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/**
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* @internal
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* @~English
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* @brief 64-bit KTX 2 index entry.
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*/
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typedef struct ktxIndexEntry64 {
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ktx_uint64_t byteOffset; /*!< Offset of item from start of file. */
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ktx_uint64_t byteLength; /*!< Number of bytes of data in the item. */
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} ktxIndexEntry64;
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/**
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* @internal
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* @~English
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* @brief KTX 2 file header.
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*
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* See the KTX 2 specification for descriptions.
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*/
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typedef struct KTX_header2 {
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ktx_uint8_t identifier[12];
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ktx_uint32_t vkFormat;
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ktx_uint32_t typeSize;
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ktx_uint32_t pixelWidth;
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ktx_uint32_t pixelHeight;
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ktx_uint32_t pixelDepth;
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ktx_uint32_t layerCount;
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ktx_uint32_t faceCount;
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ktx_uint32_t levelCount;
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ktx_uint32_t supercompressionScheme;
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ktxIndexEntry32 dataFormatDescriptor;
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ktxIndexEntry32 keyValueData;
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ktxIndexEntry64 supercompressionGlobalData;
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} KTX_header2;
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/* This will cause compilation to fail if the struct size doesn't match */
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typedef int KTX_header2_SIZE_ASSERT [sizeof(KTX_header2) == KTX2_HEADER_SIZE];
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/**
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* @internal
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* @~English
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* @brief KTX 2 level index entry.
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*/
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typedef struct ktxLevelIndexEntry {
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ktx_uint64_t byteOffset; /*!< Offset of level from start of file. */
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ktx_uint64_t byteLength;
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/*!< Number of bytes of compressed image data in the level. */
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ktx_uint64_t uncompressedByteLength;
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/*!< Number of bytes of uncompressed image data in the level. */
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} ktxLevelIndexEntry;
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/**
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* @internal
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* @~English
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* @brief Structure for supplemental information about the texture.
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*
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* _ktxCheckHeader returns supplemental information about the texture in this
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* structure that is derived during checking of the file header.
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*/
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typedef struct KTX_supplemental_info
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{
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ktx_uint8_t compressed;
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ktx_uint8_t generateMipmaps;
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ktx_uint16_t textureDimension;
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} KTX_supplemental_info;
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/**
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* @internal
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* @var ktx_uint8_t KTX_supplemental_info::compressed
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* @~English
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* @brief KTX_TRUE, if this a compressed texture, KTX_FALSE otherwise?
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*/
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/**
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* @internal
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* @var ktx_uint8_t KTX_supplemental_info::generateMipmaps
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* @~English
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* @brief KTX_TRUE, if mipmap generation is required, KTX_FALSE otherwise.
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*/
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/**
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* @internal
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* @var ktx_uint16_t KTX_supplemental_info::textureDimension
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* @~English
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* @brief The number of dimensions, 1, 2 or 3, of data in the texture image.
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*/
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/*
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* @internal
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* CheckHeader1
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*
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* Reads the KTX file header and performs some sanity checking on the values
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*/
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KTX_error_code ktxCheckHeader1_(KTX_header* pHeader,
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KTX_supplemental_info* pSuppInfo);
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/*
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* @internal
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* CheckHeader2
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*
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* Reads the KTX 2 file header and performs some sanity checking on the values
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*/
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KTX_error_code ktxCheckHeader2_(KTX_header2* pHeader,
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KTX_supplemental_info* pSuppInfo);
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/*
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* SwapEndian16: Swaps endianness in an array of 16-bit values
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*/
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void _ktxSwapEndian16(ktx_uint16_t* pData16, ktx_size_t count);
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/*
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* SwapEndian32: Swaps endianness in an array of 32-bit values
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*/
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void _ktxSwapEndian32(ktx_uint32_t* pData32, ktx_size_t count);
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/*
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* SwapEndian32: Swaps endianness in an array of 64-bit values
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*/
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void _ktxSwapEndian64(ktx_uint64_t* pData64, ktx_size_t count);
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/*
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* UnpackETC: uncompresses an ETC compressed texture image
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*/
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KTX_error_code _ktxUnpackETC(const GLubyte* srcETC, const GLenum srcFormat,
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ktx_uint32_t active_width, ktx_uint32_t active_height,
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GLubyte** dstImage,
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GLenum* format, GLenum* internalFormat, GLenum* type,
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GLint R16Formats, GLboolean supportsSRGB);
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/*
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* Pad nbytes to next multiple of n
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*/
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#define _KTX_PADN(n, nbytes) (ktx_uint32_t)(n * ceilf((float)(nbytes) / n))
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/*
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* Calculate bytes of of padding needed to reach next multiple of n.
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*/
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/* Equivalent to (n * ceil(nbytes / n)) - nbytes */
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#define _KTX_PADN_LEN(n, nbytes) \
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(ktx_uint32_t)((n * ceilf((float)(nbytes) / n)) - (nbytes))
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/*
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* Pad nbytes to next multiple of 4
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*/
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#define _KTX_PAD4(nbytes) _KTX_PADN(4, nbytes)
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/*
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* Calculate bytes of of padding needed to reach next multiple of 4.
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*/
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#define _KTX_PAD4_LEN(nbytes) _KTX_PADN_LEN(4, nbytes)
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/*
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* Pad nbytes to next multiple of 8
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*/
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#define _KTX_PAD8(nbytes) _KTX_PADN(8, nbytes)
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/*
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* Calculate bytes of of padding needed to reach next multiple of 8.
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*/
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#define _KTX_PAD8_LEN(nbytes) _KTX_PADN_LEN(8, nbytes)
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/*
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* Pad nbytes to KTX_GL_UNPACK_ALIGNMENT
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*/
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#define _KTX_PAD_UNPACK_ALIGN(nbytes) \
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_KTX_PADN(KTX_GL_UNPACK_ALIGNMENT, nbytes)
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/*
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* Calculate bytes of of padding needed to reach KTX_GL_UNPACK_ALIGNMENT.
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*/
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#define _KTX_PAD_UNPACK_ALIGN_LEN(nbytes) \
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_KTX_PADN_LEN(KTX_GL_UNPACK_ALIGNMENT, nbytes)
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/*
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======================================
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Internal utility functions
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======================================
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*/
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void printKTX2Info2(ktxStream* src, KTX_header2* header);
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#ifdef __cplusplus
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}
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#endif
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#endif /* KTXINT_H */
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