205 lines
8.3 KiB
C++
205 lines
8.3 KiB
C++
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// basisu_basis_file.cpp
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// Copyright (C) 2019 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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#include "basisu_basis_file.h"
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#include "transcoder/basisu_transcoder.h"
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// The output file version. Keep in sync with BASISD_SUPPORTED_BASIS_VERSION.
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#define BASIS_FILE_VERSION (0x13)
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namespace basisu
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{
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void basisu_file::create_header(const basisu_backend_output &encoder_output, basist::basis_texture_type tex_type, uint32_t userdata0, uint32_t userdata1, bool y_flipped, uint32_t us_per_frame)
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{
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m_header.m_header_size = sizeof(basist::basis_file_header);
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m_header.m_data_size = m_total_file_size - sizeof(basist::basis_file_header);
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m_header.m_total_slices = (uint32_t)encoder_output.m_slice_desc.size();
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m_header.m_total_images = 0;
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for (uint32_t i = 0; i < encoder_output.m_slice_desc.size(); i++)
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m_header.m_total_images = maximum<uint32_t>(m_header.m_total_images, encoder_output.m_slice_desc[i].m_source_file_index + 1);
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m_header.m_format = basist::cETC1;
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m_header.m_flags = 0;
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if (encoder_output.m_etc1s)
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m_header.m_flags = m_header.m_flags | basist::cBASISHeaderFlagETC1S;
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if (y_flipped)
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m_header.m_flags = m_header.m_flags | basist::cBASISHeaderFlagYFlipped;
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for (uint32_t i = 0; i < encoder_output.m_slice_desc.size(); i++)
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{
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if (encoder_output.m_slice_desc[i].m_alpha)
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{
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m_header.m_flags = m_header.m_flags | basist::cBASISHeaderFlagHasAlphaSlices;
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break;
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}
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}
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m_header.m_tex_type = static_cast<uint8_t>(tex_type);
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m_header.m_us_per_frame = clamp<uint32_t>(us_per_frame, 0, basist::cBASISMaxUSPerFrame);
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m_header.m_userdata0 = userdata0;
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m_header.m_userdata1 = userdata1;
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m_header.m_total_endpoints = encoder_output.m_num_endpoints;
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m_header.m_endpoint_cb_file_ofs = m_endpoint_cb_file_ofs;
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m_header.m_endpoint_cb_file_size = (uint32_t)encoder_output.m_endpoint_palette.size();
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m_header.m_total_selectors = encoder_output.m_num_selectors;
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m_header.m_selector_cb_file_ofs = m_selector_cb_file_ofs;
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m_header.m_selector_cb_file_size = (uint32_t)encoder_output.m_selector_palette.size();
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m_header.m_tables_file_ofs = m_tables_file_ofs;
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m_header.m_tables_file_size = (uint32_t)encoder_output.m_slice_image_tables.size();
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m_header.m_slice_desc_file_ofs = m_slice_descs_file_ofs;
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}
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bool basisu_file::create_image_descs(const basisu_backend_output &encoder_output)
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{
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const basisu_backend_slice_desc_vec &slice_descs = encoder_output.m_slice_desc;
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m_images_descs.resize(slice_descs.size());
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uint64_t cur_slice_file_ofs = m_first_image_file_ofs;
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for (uint32_t i = 0; i < slice_descs.size(); i++)
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{
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clear_obj(m_images_descs[i]);
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m_images_descs[i].m_image_index = slice_descs[i].m_source_file_index;
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m_images_descs[i].m_level_index = slice_descs[i].m_mip_index;
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if (slice_descs[i].m_alpha)
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m_images_descs[i].m_flags = m_images_descs[i].m_flags | basist::cSliceDescFlagsIsAlphaData;
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if (slice_descs[i].m_iframe)
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m_images_descs[i].m_flags = m_images_descs[i].m_flags | basist::cSliceDescFlagsFrameIsIFrame;
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m_images_descs[i].m_orig_width = slice_descs[i].m_orig_width;
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m_images_descs[i].m_orig_height = slice_descs[i].m_orig_height;
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m_images_descs[i].m_num_blocks_x = slice_descs[i].m_num_blocks_x;
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m_images_descs[i].m_num_blocks_y = slice_descs[i].m_num_blocks_y;
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m_images_descs[i].m_slice_data_crc16 = encoder_output.m_slice_image_crcs[i];
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if (encoder_output.m_slice_image_data[i].size() > UINT32_MAX)
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{
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error_printf("basisu_file::create_image_descs: Basis file too large\n");
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return false;
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}
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const uint32_t image_size = (uint32_t)encoder_output.m_slice_image_data[i].size();
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m_images_descs[i].m_file_ofs = (uint32_t)cur_slice_file_ofs;
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m_images_descs[i].m_file_size = image_size;
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cur_slice_file_ofs += image_size;
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if (cur_slice_file_ofs > UINT32_MAX)
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{
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error_printf("basisu_file::create_image_descs: Basis file too large\n");
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return false;
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}
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}
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assert(cur_slice_file_ofs == m_total_file_size);
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return true;
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}
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void basisu_file::create_comp_data(const basisu_backend_output &encoder_output)
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{
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const basisu_backend_slice_desc_vec &slice_descs = encoder_output.m_slice_desc;
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append_vector(m_comp_data, reinterpret_cast<const uint8_t *>(&m_header), sizeof(m_header));
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assert(m_comp_data.size() == m_slice_descs_file_ofs);
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append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&m_images_descs[0]), m_images_descs.size() * sizeof(m_images_descs[0]));
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assert(m_comp_data.size() == m_endpoint_cb_file_ofs);
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append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&encoder_output.m_endpoint_palette[0]), encoder_output.m_endpoint_palette.size());
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assert(m_comp_data.size() == m_selector_cb_file_ofs);
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append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&encoder_output.m_selector_palette[0]), encoder_output.m_selector_palette.size());
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assert(m_comp_data.size() == m_tables_file_ofs);
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append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&encoder_output.m_slice_image_tables[0]), encoder_output.m_slice_image_tables.size());
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assert(m_comp_data.size() == m_first_image_file_ofs);
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for (uint32_t i = 0; i < slice_descs.size(); i++)
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append_vector(m_comp_data, &encoder_output.m_slice_image_data[i][0], encoder_output.m_slice_image_data[i].size());
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assert(m_comp_data.size() == m_total_file_size);
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}
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void basisu_file::fixup_crcs()
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{
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basist::basis_file_header *pHeader = reinterpret_cast<basist::basis_file_header *>(&m_comp_data[0]);
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pHeader->m_data_size = m_total_file_size - sizeof(basist::basis_file_header);
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pHeader->m_data_crc16 = basist::crc16(&m_comp_data[0] + sizeof(basist::basis_file_header), m_total_file_size - sizeof(basist::basis_file_header), 0);
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pHeader->m_header_crc16 = basist::crc16(&pHeader->m_data_size, sizeof(basist::basis_file_header) - BASISU_OFFSETOF(basist::basis_file_header, m_data_size), 0);
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pHeader->m_sig = basist::basis_file_header::cBASISSigValue;
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pHeader->m_ver = BASIS_FILE_VERSION;// basist::basis_file_header::cBASISFirstVersion;
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}
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bool basisu_file::init(const basisu_backend_output &encoder_output, basist::basis_texture_type tex_type, uint32_t userdata0, uint32_t userdata1, bool y_flipped, uint32_t us_per_frame)
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{
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clear();
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const basisu_backend_slice_desc_vec &slice_descs = encoder_output.m_slice_desc;
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// The Basis file uses 32-bit fields for lots of stuff, so make sure it's not too large.
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uint64_t check_size = (uint64_t)sizeof(basist::basis_file_header) + (uint64_t)sizeof(basist::basis_slice_desc) * slice_descs.size() +
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(uint64_t)encoder_output.m_endpoint_palette.size() + (uint64_t)encoder_output.m_selector_palette.size() + (uint64_t)encoder_output.m_slice_image_tables.size();
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if (check_size >= 0xFFFF0000ULL)
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{
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error_printf("basisu_file::init: File is too large!\n");
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return false;
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}
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m_header_file_ofs = 0;
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m_slice_descs_file_ofs = sizeof(basist::basis_file_header);
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m_endpoint_cb_file_ofs = m_slice_descs_file_ofs + sizeof(basist::basis_slice_desc) * (uint32_t)slice_descs.size();
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m_selector_cb_file_ofs = m_endpoint_cb_file_ofs + (uint32_t)encoder_output.m_endpoint_palette.size();
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m_tables_file_ofs = m_selector_cb_file_ofs + (uint32_t)encoder_output.m_selector_palette.size();
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m_first_image_file_ofs = m_tables_file_ofs + (uint32_t)encoder_output.m_slice_image_tables.size();
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uint64_t total_file_size = m_first_image_file_ofs;
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for (uint32_t i = 0; i < encoder_output.m_slice_image_data.size(); i++)
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total_file_size += encoder_output.m_slice_image_data[i].size();
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if (total_file_size >= 0xFFFF0000ULL)
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{
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error_printf("basisu_file::init: File is too large!\n");
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return false;
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}
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m_total_file_size = (uint32_t)total_file_size;
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create_header(encoder_output, tex_type, userdata0, userdata1, y_flipped, us_per_frame);
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if (!create_image_descs(encoder_output))
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return false;
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create_comp_data(encoder_output);
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fixup_crcs();
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return true;
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}
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} // namespace basisu
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