1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
|
// basisu_basis_file.cpp
// Copyright (C) 2019 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.
#include "basisu_basis_file.h"
#include "transcoder/basisu_transcoder.h"
// The output file version. Keep in sync with BASISD_SUPPORTED_BASIS_VERSION.
#define BASIS_FILE_VERSION (0x13)
namespace basisu
{
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)
{
m_header.m_header_size = sizeof(basist::basis_file_header);
m_header.m_data_size = m_total_file_size - sizeof(basist::basis_file_header);
m_header.m_total_slices = (uint32_t)encoder_output.m_slice_desc.size();
m_header.m_total_images = 0;
for (uint32_t i = 0; i < encoder_output.m_slice_desc.size(); i++)
m_header.m_total_images = maximum<uint32_t>(m_header.m_total_images, encoder_output.m_slice_desc[i].m_source_file_index + 1);
m_header.m_format = 0;// basist::block_format::cETC1;
m_header.m_flags = 0;
if (encoder_output.m_etc1s)
m_header.m_flags = m_header.m_flags | basist::cBASISHeaderFlagETC1S;
if (y_flipped)
m_header.m_flags = m_header.m_flags | basist::cBASISHeaderFlagYFlipped;
for (uint32_t i = 0; i < encoder_output.m_slice_desc.size(); i++)
{
if (encoder_output.m_slice_desc[i].m_alpha)
{
m_header.m_flags = m_header.m_flags | basist::cBASISHeaderFlagHasAlphaSlices;
break;
}
}
m_header.m_tex_type = static_cast<uint8_t>(tex_type);
m_header.m_us_per_frame = clamp<uint32_t>(us_per_frame, 0, basist::cBASISMaxUSPerFrame);
m_header.m_userdata0 = userdata0;
m_header.m_userdata1 = userdata1;
m_header.m_total_endpoints = encoder_output.m_num_endpoints;
m_header.m_endpoint_cb_file_ofs = m_endpoint_cb_file_ofs;
m_header.m_endpoint_cb_file_size = (uint32_t)encoder_output.m_endpoint_palette.size();
m_header.m_total_selectors = encoder_output.m_num_selectors;
m_header.m_selector_cb_file_ofs = m_selector_cb_file_ofs;
m_header.m_selector_cb_file_size = (uint32_t)encoder_output.m_selector_palette.size();
m_header.m_tables_file_ofs = m_tables_file_ofs;
m_header.m_tables_file_size = (uint32_t)encoder_output.m_slice_image_tables.size();
m_header.m_slice_desc_file_ofs = m_slice_descs_file_ofs;
}
bool basisu_file::create_image_descs(const basisu_backend_output &encoder_output)
{
const basisu_backend_slice_desc_vec &slice_descs = encoder_output.m_slice_desc;
m_images_descs.resize(slice_descs.size());
uint64_t cur_slice_file_ofs = m_first_image_file_ofs;
for (uint32_t i = 0; i < slice_descs.size(); i++)
{
clear_obj(m_images_descs[i]);
m_images_descs[i].m_image_index = slice_descs[i].m_source_file_index;
m_images_descs[i].m_level_index = slice_descs[i].m_mip_index;
if (slice_descs[i].m_alpha)
m_images_descs[i].m_flags = m_images_descs[i].m_flags | basist::cSliceDescFlagsIsAlphaData;
if (slice_descs[i].m_iframe)
m_images_descs[i].m_flags = m_images_descs[i].m_flags | basist::cSliceDescFlagsFrameIsIFrame;
m_images_descs[i].m_orig_width = slice_descs[i].m_orig_width;
m_images_descs[i].m_orig_height = slice_descs[i].m_orig_height;
m_images_descs[i].m_num_blocks_x = slice_descs[i].m_num_blocks_x;
m_images_descs[i].m_num_blocks_y = slice_descs[i].m_num_blocks_y;
m_images_descs[i].m_slice_data_crc16 = encoder_output.m_slice_image_crcs[i];
if (encoder_output.m_slice_image_data[i].size() > UINT32_MAX)
{
error_printf("basisu_file::create_image_descs: Basis file too large\n");
return false;
}
const uint32_t image_size = (uint32_t)encoder_output.m_slice_image_data[i].size();
m_images_descs[i].m_file_ofs = (uint32_t)cur_slice_file_ofs;
m_images_descs[i].m_file_size = image_size;
cur_slice_file_ofs += image_size;
if (cur_slice_file_ofs > UINT32_MAX)
{
error_printf("basisu_file::create_image_descs: Basis file too large\n");
return false;
}
}
assert(cur_slice_file_ofs == m_total_file_size);
return true;
}
void basisu_file::create_comp_data(const basisu_backend_output &encoder_output)
{
const basisu_backend_slice_desc_vec &slice_descs = encoder_output.m_slice_desc;
append_vector(m_comp_data, reinterpret_cast<const uint8_t *>(&m_header), sizeof(m_header));
assert(m_comp_data.size() == m_slice_descs_file_ofs);
append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&m_images_descs[0]), m_images_descs.size() * sizeof(m_images_descs[0]));
assert(m_comp_data.size() == m_endpoint_cb_file_ofs);
append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&encoder_output.m_endpoint_palette[0]), encoder_output.m_endpoint_palette.size());
assert(m_comp_data.size() == m_selector_cb_file_ofs);
append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&encoder_output.m_selector_palette[0]), encoder_output.m_selector_palette.size());
assert(m_comp_data.size() == m_tables_file_ofs);
append_vector(m_comp_data, reinterpret_cast<const uint8_t*>(&encoder_output.m_slice_image_tables[0]), encoder_output.m_slice_image_tables.size());
assert(m_comp_data.size() == m_first_image_file_ofs);
for (uint32_t i = 0; i < slice_descs.size(); i++)
append_vector(m_comp_data, &encoder_output.m_slice_image_data[i][0], encoder_output.m_slice_image_data[i].size());
assert(m_comp_data.size() == m_total_file_size);
}
void basisu_file::fixup_crcs()
{
basist::basis_file_header *pHeader = reinterpret_cast<basist::basis_file_header *>(&m_comp_data[0]);
pHeader->m_data_size = m_total_file_size - sizeof(basist::basis_file_header);
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);
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);
pHeader->m_sig = basist::basis_file_header::cBASISSigValue;
pHeader->m_ver = BASIS_FILE_VERSION;// basist::basis_file_header::cBASISFirstVersion;
}
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)
{
clear();
const basisu_backend_slice_desc_vec &slice_descs = encoder_output.m_slice_desc;
// The Basis file uses 32-bit fields for lots of stuff, so make sure it's not too large.
uint64_t check_size = (uint64_t)sizeof(basist::basis_file_header) + (uint64_t)sizeof(basist::basis_slice_desc) * slice_descs.size() +
(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();
if (check_size >= 0xFFFF0000ULL)
{
error_printf("basisu_file::init: File is too large!\n");
return false;
}
m_header_file_ofs = 0;
m_slice_descs_file_ofs = sizeof(basist::basis_file_header);
m_endpoint_cb_file_ofs = m_slice_descs_file_ofs + sizeof(basist::basis_slice_desc) * (uint32_t)slice_descs.size();
m_selector_cb_file_ofs = m_endpoint_cb_file_ofs + (uint32_t)encoder_output.m_endpoint_palette.size();
m_tables_file_ofs = m_selector_cb_file_ofs + (uint32_t)encoder_output.m_selector_palette.size();
m_first_image_file_ofs = m_tables_file_ofs + (uint32_t)encoder_output.m_slice_image_tables.size();
uint64_t total_file_size = m_first_image_file_ofs;
for (uint32_t i = 0; i < encoder_output.m_slice_image_data.size(); i++)
total_file_size += encoder_output.m_slice_image_data[i].size();
if (total_file_size >= 0xFFFF0000ULL)
{
error_printf("basisu_file::init: File is too large!\n");
return false;
}
m_total_file_size = (uint32_t)total_file_size;
create_header(encoder_output, tex_type, userdata0, userdata1, y_flipped, us_per_frame);
if (!create_image_descs(encoder_output))
return false;
create_comp_data(encoder_output);
fixup_crcs();
return true;
}
} // namespace basisu
|