143 lines
7.2 KiB
C++
143 lines
7.2 KiB
C++
// basis_file_headers.h
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// Copyright (C) 2019-2020 Binomial LLC. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#pragma once
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#include "basisu_transcoder_internal.h"
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namespace basist
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{
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// Slice desc header flags
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enum basis_slice_desc_flags
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{
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cSliceDescFlagsHasAlpha = 1,
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// Video only: Frame doesn't refer to previous frame (no usage of conditional replenishment pred symbols)
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// Currently the first frame is always an I-Frame, all subsequent frames are P-Frames. This will eventually be changed to periodic I-Frames.
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cSliceDescFlagsFrameIsIFrame = 2
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};
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#pragma pack(push)
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#pragma pack(1)
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struct basis_slice_desc
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{
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basisu::packed_uint<3> m_image_index; // The index of the source image provided to the encoder (will always appear in order from first to last, first image index is 0, no skipping allowed)
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basisu::packed_uint<1> m_level_index; // The mipmap level index (mipmaps will always appear from largest to smallest)
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basisu::packed_uint<1> m_flags; // enum basis_slice_desc_flags
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basisu::packed_uint<2> m_orig_width; // The original image width (may not be a multiple of 4 pixels)
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basisu::packed_uint<2> m_orig_height; // The original image height (may not be a multiple of 4 pixels)
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basisu::packed_uint<2> m_num_blocks_x; // The slice's block X dimensions. Each block is 4x4 pixels. The slice's pixel resolution may or may not be a power of 2.
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basisu::packed_uint<2> m_num_blocks_y; // The slice's block Y dimensions.
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basisu::packed_uint<4> m_file_ofs; // Offset from the start of the file to the start of the slice's data
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basisu::packed_uint<4> m_file_size; // The size of the compressed slice data in bytes
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basisu::packed_uint<2> m_slice_data_crc16; // The CRC16 of the compressed slice data, for extra-paranoid use cases
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};
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// File header files
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enum basis_header_flags
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{
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// Always set for ETC1S files. Not set for UASTC files.
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cBASISHeaderFlagETC1S = 1,
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// Set if the texture had to be Y flipped before encoding. The actual interpretation of this (is Y up or down?) is up to the user.
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cBASISHeaderFlagYFlipped = 2,
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// Set if any slices contain alpha (for ETC1S, if the odd slices contain alpha data)
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cBASISHeaderFlagHasAlphaSlices = 4,
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// For ETC1S files, this will be true if the file utilizes a codebook from another .basis file.
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cBASISHeaderFlagUsesGlobalCodebook = 8,
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// Set if the texture data is sRGB, otherwise it's linear.
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// In reality, we have no idea if the texture data is actually linear or sRGB. This is the m_perceptual parameter passed to the compressor.
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cBASISHeaderFlagSRGB = 16,
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};
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// The image type field attempts to describe how to interpret the image data in a Basis file.
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// The encoder library doesn't really do anything special or different with these texture types, this is mostly here for the benefit of the user.
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// We do make sure the various constraints are followed (2DArray/cubemap/videoframes/volume implies that each image has the same resolution and # of mipmap levels, etc., cubemap implies that the # of image slices is a multiple of 6)
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enum basis_texture_type
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{
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cBASISTexType2D = 0, // An arbitrary array of 2D RGB or RGBA images with optional mipmaps, array size = # images, each image may have a different resolution and # of mipmap levels
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cBASISTexType2DArray = 1, // An array of 2D RGB or RGBA images with optional mipmaps, array size = # images, each image has the same resolution and mipmap levels
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cBASISTexTypeCubemapArray = 2, // an array of cubemap levels, total # of images must be divisable by 6, in X+, X-, Y+, Y-, Z+, Z- order, with optional mipmaps
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cBASISTexTypeVideoFrames = 3, // An array of 2D video frames, with optional mipmaps, # frames = # images, each image has the same resolution and # of mipmap levels
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cBASISTexTypeVolume = 4, // A 3D texture with optional mipmaps, Z dimension = # images, each image has the same resolution and # of mipmap levels
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cBASISTexTypeTotal
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};
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enum
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{
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cBASISMaxUSPerFrame = 0xFFFFFF
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};
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enum class basis_tex_format
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{
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cETC1S = 0,
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cUASTC4x4 = 1
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};
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struct basis_file_header
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{
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enum
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{
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cBASISSigValue = ('B' << 8) | 's',
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cBASISFirstVersion = 0x10
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};
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basisu::packed_uint<2> m_sig; // 2 byte file signature
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basisu::packed_uint<2> m_ver; // Baseline file version
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basisu::packed_uint<2> m_header_size; // Header size in bytes, sizeof(basis_file_header)
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basisu::packed_uint<2> m_header_crc16; // CRC16 of the remaining header data
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basisu::packed_uint<4> m_data_size; // The total size of all data after the header
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basisu::packed_uint<2> m_data_crc16; // The CRC16 of all data after the header
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basisu::packed_uint<3> m_total_slices; // The total # of compressed slices (1 slice per image, or 2 for alpha .basis files)
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basisu::packed_uint<3> m_total_images; // The total # of images
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basisu::packed_uint<1> m_tex_format; // enum basis_tex_format
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basisu::packed_uint<2> m_flags; // enum basist::header_flags
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basisu::packed_uint<1> m_tex_type; // enum basist::basis_texture_type
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basisu::packed_uint<3> m_us_per_frame; // Framerate of video, in microseconds per frame
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basisu::packed_uint<4> m_reserved; // For future use
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basisu::packed_uint<4> m_userdata0; // For client use
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basisu::packed_uint<4> m_userdata1; // For client use
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basisu::packed_uint<2> m_total_endpoints; // The number of endpoints in the endpoint codebook
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basisu::packed_uint<4> m_endpoint_cb_file_ofs; // The compressed endpoint codebook's file offset relative to the start of the file
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basisu::packed_uint<3> m_endpoint_cb_file_size; // The compressed endpoint codebook's size in bytes
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basisu::packed_uint<2> m_total_selectors; // The number of selectors in the endpoint codebook
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basisu::packed_uint<4> m_selector_cb_file_ofs; // The compressed selectors codebook's file offset relative to the start of the file
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basisu::packed_uint<3> m_selector_cb_file_size; // The compressed selector codebook's size in bytes
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basisu::packed_uint<4> m_tables_file_ofs; // The file offset of the compressed Huffman codelength tables, for decompressing slices
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basisu::packed_uint<4> m_tables_file_size; // The file size in bytes of the compressed huffman codelength tables
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basisu::packed_uint<4> m_slice_desc_file_ofs; // The file offset to the slice description array, usually follows the header
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basisu::packed_uint<4> m_extended_file_ofs; // The file offset of the "extended" header and compressed data, for future use
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basisu::packed_uint<4> m_extended_file_size; // The file size in bytes of the "extended" header and compressed data, for future use
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};
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#pragma pack (pop)
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} // namespace basist
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