/* -*- tab-width: 4; -*- */ /* vi: set sw=2 ts=4 expandtab textwidth=70: */ /* * Copyright 2019-2020 The Khronos Group Inc. * SPDX-License-Identifier: Apache-2.0 */ /** * @internal * @file basisu_sgd.h * @~English * * @brief Declare global data for Basis LZ supercompression with ETC1S. * * These functions are private and should not be used outside the library. */ #ifndef _BASIS_SGD_H_ #define _BASIS_SGD_H_ #include <stdint.h> #ifdef __cplusplus extern "C" { #endif // This must be the same value as cSliceDescFlagsFrameIsIFrame so we can just // invert the bit when passing back & forth. As FrameIsIFrame is within // a C namespace it can't easily be accessed from a c header. enum bu_image_flags__bits_e { … }; buFlags; ktxBasisLzGlobalHeader; // This header is followed by imageCount "slice" descriptions. // 1, or 2 slices per image (i.e. layer, face & slice). // These offsets are relative to start of a mip level as given by the // main levelIndex. ktxBasisLzEtc1sImageDesc; #define BGD_ETC1S_IMAGE_DESCS(bgd) … // The are followed in the global data by these ... // uint8_t[endpointsByteLength] endpointsData; // uint8_t[selectorsByteLength] selectorsData; // uint8_t[tablesByteLength] tablesData; #define BGD_ENDPOINTS_ADDR(bgd, imageCount) … #define BGD_SELECTORS_ADDR(bgd, bgdh, imageCount) … #define BGD_TABLES_ADDR(bgd, bgdh, imageCount) … #define BGD_EXTENDED_ADDR(bgd, bgdh, imageCount) … // Just because this is a convenient place to put it for basis_{en,trans}code. enum alpha_content_e { … }; #ifdef __cplusplus } #endif #endif /* _BASIS_SGD_H_ */
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