mirror of
https://github.com/godotengine/godot.git
synced 2025-11-04 07:31:16 +00:00
143 lines
7.2 KiB
C++
143 lines
7.2 KiB
C++
// basis_file_headers.h
|
|
// Copyright (C) 2019-2024 Binomial LLC. All Rights Reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
#pragma once
|
|
#include "basisu_transcoder_internal.h"
|
|
|
|
namespace basist
|
|
{
|
|
// Slice desc header flags
|
|
enum basis_slice_desc_flags
|
|
{
|
|
cSliceDescFlagsHasAlpha = 1,
|
|
|
|
// Video only: Frame doesn't refer to previous frame (no usage of conditional replenishment pred symbols)
|
|
// Currently the first frame is always an I-Frame, all subsequent frames are P-Frames. This will eventually be changed to periodic I-Frames.
|
|
cSliceDescFlagsFrameIsIFrame = 2
|
|
};
|
|
|
|
#pragma pack(push)
|
|
#pragma pack(1)
|
|
struct basis_slice_desc
|
|
{
|
|
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)
|
|
basisu::packed_uint<1> m_level_index; // The mipmap level index (mipmaps will always appear from largest to smallest)
|
|
basisu::packed_uint<1> m_flags; // enum basis_slice_desc_flags
|
|
|
|
basisu::packed_uint<2> m_orig_width; // The original image width (may not be a multiple of 4 pixels)
|
|
basisu::packed_uint<2> m_orig_height; // The original image height (may not be a multiple of 4 pixels)
|
|
|
|
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.
|
|
basisu::packed_uint<2> m_num_blocks_y; // The slice's block Y dimensions.
|
|
|
|
basisu::packed_uint<4> m_file_ofs; // Offset from the start of the file to the start of the slice's data
|
|
basisu::packed_uint<4> m_file_size; // The size of the compressed slice data in bytes
|
|
|
|
basisu::packed_uint<2> m_slice_data_crc16; // The CRC16 of the compressed slice data, for extra-paranoid use cases
|
|
};
|
|
|
|
// File header files
|
|
enum basis_header_flags
|
|
{
|
|
// Always set for ETC1S files. Not set for UASTC files.
|
|
cBASISHeaderFlagETC1S = 1,
|
|
|
|
// 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.
|
|
cBASISHeaderFlagYFlipped = 2,
|
|
|
|
// Set if any slices contain alpha (for ETC1S, if the odd slices contain alpha data)
|
|
cBASISHeaderFlagHasAlphaSlices = 4,
|
|
|
|
// For ETC1S files, this will be true if the file utilizes a codebook from another .basis file.
|
|
cBASISHeaderFlagUsesGlobalCodebook = 8,
|
|
|
|
// Set if the texture data is sRGB, otherwise it's linear.
|
|
// 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.
|
|
cBASISHeaderFlagSRGB = 16,
|
|
};
|
|
|
|
// The image type field attempts to describe how to interpret the image data in a Basis file.
|
|
// 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.
|
|
// 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)
|
|
enum basis_texture_type
|
|
{
|
|
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
|
|
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
|
|
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
|
|
cBASISTexTypeVideoFrames = 3, // An array of 2D video frames, with optional mipmaps, # frames = # images, each image has the same resolution and # of mipmap levels
|
|
cBASISTexTypeVolume = 4, // A 3D texture with optional mipmaps, Z dimension = # images, each image has the same resolution and # of mipmap levels
|
|
|
|
cBASISTexTypeTotal
|
|
};
|
|
|
|
enum
|
|
{
|
|
cBASISMaxUSPerFrame = 0xFFFFFF
|
|
};
|
|
|
|
enum class basis_tex_format
|
|
{
|
|
cETC1S = 0,
|
|
cUASTC4x4 = 1,
|
|
cUASTC_HDR_4x4 = 2
|
|
};
|
|
|
|
struct basis_file_header
|
|
{
|
|
enum
|
|
{
|
|
cBASISSigValue = ('B' << 8) | 's',
|
|
cBASISFirstVersion = 0x10
|
|
};
|
|
|
|
basisu::packed_uint<2> m_sig; // 2 byte file signature
|
|
basisu::packed_uint<2> m_ver; // Baseline file version
|
|
basisu::packed_uint<2> m_header_size; // Header size in bytes, sizeof(basis_file_header)
|
|
basisu::packed_uint<2> m_header_crc16; // CRC16 of the remaining header data
|
|
|
|
basisu::packed_uint<4> m_data_size; // The total size of all data after the header
|
|
basisu::packed_uint<2> m_data_crc16; // The CRC16 of all data after the header
|
|
|
|
basisu::packed_uint<3> m_total_slices; // The total # of compressed slices (1 slice per image, or 2 for alpha .basis files)
|
|
|
|
basisu::packed_uint<3> m_total_images; // The total # of images
|
|
|
|
basisu::packed_uint<1> m_tex_format; // enum basis_tex_format
|
|
basisu::packed_uint<2> m_flags; // enum basist::header_flags
|
|
basisu::packed_uint<1> m_tex_type; // enum basist::basis_texture_type
|
|
basisu::packed_uint<3> m_us_per_frame; // Framerate of video, in microseconds per frame
|
|
|
|
basisu::packed_uint<4> m_reserved; // For future use
|
|
basisu::packed_uint<4> m_userdata0; // For client use
|
|
basisu::packed_uint<4> m_userdata1; // For client use
|
|
|
|
basisu::packed_uint<2> m_total_endpoints; // The number of endpoints in the endpoint codebook
|
|
basisu::packed_uint<4> m_endpoint_cb_file_ofs; // The compressed endpoint codebook's file offset relative to the start of the file
|
|
basisu::packed_uint<3> m_endpoint_cb_file_size; // The compressed endpoint codebook's size in bytes
|
|
|
|
basisu::packed_uint<2> m_total_selectors; // The number of selectors in the endpoint codebook
|
|
basisu::packed_uint<4> m_selector_cb_file_ofs; // The compressed selectors codebook's file offset relative to the start of the file
|
|
basisu::packed_uint<3> m_selector_cb_file_size; // The compressed selector codebook's size in bytes
|
|
|
|
basisu::packed_uint<4> m_tables_file_ofs; // The file offset of the compressed Huffman codelength tables, for decompressing slices
|
|
basisu::packed_uint<4> m_tables_file_size; // The file size in bytes of the compressed huffman codelength tables
|
|
|
|
basisu::packed_uint<4> m_slice_desc_file_ofs; // The file offset to the slice description array, usually follows the header
|
|
|
|
basisu::packed_uint<4> m_extended_file_ofs; // The file offset of the "extended" header and compressed data, for future use
|
|
basisu::packed_uint<4> m_extended_file_size; // The file size in bytes of the "extended" header and compressed data, for future use
|
|
};
|
|
#pragma pack (pop)
|
|
|
|
} // namespace basist
|