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410 lines
9.9 KiB
C++
410 lines
9.9 KiB
C++
// basisu_backend.h
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// Copyright (C) 2019-2024 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 "../transcoder/basisu.h"
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#include "basisu_enc.h"
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#include "../transcoder/basisu_transcoder_internal.h"
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#include "basisu_frontend.h"
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namespace basisu
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{
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struct etc1_selector_palette_entry
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{
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etc1_selector_palette_entry()
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{
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clear();
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}
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void clear()
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{
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basisu::clear_obj(*this);
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}
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uint8_t operator[] (uint32_t i) const { assert(i < 16); return m_selectors[i]; }
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uint8_t& operator[] (uint32_t i) { assert(i < 16); return m_selectors[i]; }
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void set_uint32(uint32_t v)
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{
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for (uint32_t byte_index = 0; byte_index < 4; byte_index++)
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{
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uint32_t b = (v >> (byte_index * 8)) & 0xFF;
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m_selectors[byte_index * 4 + 0] = b & 3;
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m_selectors[byte_index * 4 + 1] = (b >> 2) & 3;
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m_selectors[byte_index * 4 + 2] = (b >> 4) & 3;
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m_selectors[byte_index * 4 + 3] = (b >> 6) & 3;
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}
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}
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uint32_t get_uint32() const
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{
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return get_byte(0) | (get_byte(1) << 8) | (get_byte(2) << 16) | (get_byte(3) << 24);
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}
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uint32_t get_byte(uint32_t byte_index) const
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{
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assert(byte_index < 4);
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return m_selectors[byte_index * 4 + 0] |
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(m_selectors[byte_index * 4 + 1] << 2) |
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(m_selectors[byte_index * 4 + 2] << 4) |
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(m_selectors[byte_index * 4 + 3] << 6);
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}
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uint8_t operator()(uint32_t x, uint32_t y) const { assert((x < 4) && (y < 4)); return m_selectors[x + y * 4]; }
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uint8_t& operator()(uint32_t x, uint32_t y) { assert((x < 4) && (y < 4)); return m_selectors[x + y * 4]; }
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bool operator< (const etc1_selector_palette_entry& other) const
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{
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for (uint32_t i = 0; i < 16; i++)
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{
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if (m_selectors[i] < other.m_selectors[i])
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return true;
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else if (m_selectors[i] != other.m_selectors[i])
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return false;
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}
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return false;
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}
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bool operator== (const etc1_selector_palette_entry& other) const
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{
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for (uint32_t i = 0; i < 16; i++)
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{
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if (m_selectors[i] != other.m_selectors[i])
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return false;
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}
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return true;
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}
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private:
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uint8_t m_selectors[16];
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};
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typedef basisu::vector<etc1_selector_palette_entry> etc1_selector_palette_entry_vec;
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struct encoder_block
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{
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encoder_block()
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{
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clear();
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}
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uint32_t m_endpoint_predictor;
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int m_endpoint_index;
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int m_selector_index;
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int m_selector_history_buf_index;
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bool m_is_cr_target;
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void clear()
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{
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m_endpoint_predictor = 0;
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m_endpoint_index = 0;
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m_selector_index = 0;
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m_selector_history_buf_index = 0;
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m_is_cr_target = false;
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}
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};
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typedef basisu::vector<encoder_block> encoder_block_vec;
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typedef vector2D<encoder_block> encoder_block_vec2D;
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struct etc1_endpoint_palette_entry
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{
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etc1_endpoint_palette_entry()
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{
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clear();
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}
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color_rgba m_color5;
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uint32_t m_inten5;
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bool m_color5_valid;
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void clear()
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{
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clear_obj(*this);
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}
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};
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typedef basisu::vector<etc1_endpoint_palette_entry> etc1_endpoint_palette_entry_vec;
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struct basisu_backend_params
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{
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bool m_etc1s;
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bool m_debug, m_debug_images;
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float m_endpoint_rdo_quality_thresh;
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float m_selector_rdo_quality_thresh;
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uint32_t m_compression_level;
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bool m_used_global_codebooks;
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bool m_validate;
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basisu_backend_params()
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{
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clear();
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}
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void clear()
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{
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m_etc1s = false;
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m_debug = false;
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m_debug_images = false;
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m_endpoint_rdo_quality_thresh = 0.0f;
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m_selector_rdo_quality_thresh = 0.0f;
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m_compression_level = 0;
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m_used_global_codebooks = false;
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m_validate = true;
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}
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};
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struct basisu_backend_slice_desc
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{
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basisu_backend_slice_desc()
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{
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clear();
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}
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void clear()
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{
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clear_obj(*this);
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}
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uint32_t m_first_block_index;
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uint32_t m_orig_width;
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uint32_t m_orig_height;
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uint32_t m_width;
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uint32_t m_height;
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uint32_t m_num_blocks_x;
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uint32_t m_num_blocks_y;
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uint32_t m_num_macroblocks_x;
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uint32_t m_num_macroblocks_y;
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uint32_t m_source_file_index; // also the basis image index
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uint32_t m_mip_index;
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bool m_alpha;
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bool m_iframe;
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};
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typedef basisu::vector<basisu_backend_slice_desc> basisu_backend_slice_desc_vec;
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struct basisu_backend_output
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{
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basist::basis_tex_format m_tex_format;
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bool m_etc1s;
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bool m_uses_global_codebooks;
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bool m_srgb;
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uint32_t m_num_endpoints;
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uint32_t m_num_selectors;
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uint8_vec m_endpoint_palette;
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uint8_vec m_selector_palette;
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basisu_backend_slice_desc_vec m_slice_desc;
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uint8_vec m_slice_image_tables;
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basisu::vector<uint8_vec> m_slice_image_data;
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uint16_vec m_slice_image_crcs;
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basisu_backend_output()
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{
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clear();
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}
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void clear()
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{
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m_tex_format = basist::basis_tex_format::cETC1S;
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m_etc1s = false;
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m_uses_global_codebooks = false;
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m_srgb = true;
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m_num_endpoints = 0;
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m_num_selectors = 0;
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m_endpoint_palette.clear();
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m_selector_palette.clear();
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m_slice_desc.clear();
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m_slice_image_tables.clear();
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m_slice_image_data.clear();
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m_slice_image_crcs.clear();
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}
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uint32_t get_output_size_estimate() const
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{
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uint32_t total_compressed_bytes = (uint32_t)(m_slice_image_tables.size() + m_endpoint_palette.size() + m_selector_palette.size());
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for (uint32_t i = 0; i < m_slice_image_data.size(); i++)
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total_compressed_bytes += (uint32_t)m_slice_image_data[i].size();
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return total_compressed_bytes;
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}
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};
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class basisu_backend
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{
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BASISU_NO_EQUALS_OR_COPY_CONSTRUCT(basisu_backend);
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public:
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basisu_backend();
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void clear();
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void init(basisu_frontend *pFront_end, basisu_backend_params ¶ms, const basisu_backend_slice_desc_vec &slice_desc);
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uint32_t encode();
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const basisu_backend_output &get_output() const { return m_output; }
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const basisu_backend_params& get_params() const { return m_params; }
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private:
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basisu_frontend *m_pFront_end;
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basisu_backend_params m_params;
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basisu_backend_slice_desc_vec m_slices;
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basisu_backend_output m_output;
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etc1_endpoint_palette_entry_vec m_endpoint_palette;
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etc1_selector_palette_entry_vec m_selector_palette;
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struct etc1_global_selector_cb_entry_desc
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{
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uint32_t m_pal_index;
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uint32_t m_mod_index;
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bool m_was_used;
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};
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typedef basisu::vector<etc1_global_selector_cb_entry_desc> etc1_global_selector_cb_entry_desc_vec;
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etc1_global_selector_cb_entry_desc_vec m_global_selector_palette_desc;
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basisu::vector<encoder_block_vec2D> m_slice_encoder_blocks;
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// Maps OLD to NEW endpoint/selector indices
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uint_vec m_endpoint_remap_table_old_to_new;
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uint_vec m_endpoint_remap_table_new_to_old;
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bool_vec m_old_endpoint_was_used;
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bool_vec m_new_endpoint_was_used;
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uint_vec m_selector_remap_table_old_to_new;
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// Maps NEW to OLD endpoint/selector indices
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uint_vec m_selector_remap_table_new_to_old;
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uint32_t get_total_slices() const
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{
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return (uint32_t)m_slices.size();
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}
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uint32_t get_total_slice_blocks() const
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{
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return m_pFront_end->get_total_output_blocks();
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}
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uint32_t get_block_index(uint32_t slice_index, uint32_t block_x, uint32_t block_y) const
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{
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const basisu_backend_slice_desc &slice = m_slices[slice_index];
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assert((block_x < slice.m_num_blocks_x) && (block_y < slice.m_num_blocks_y));
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return slice.m_first_block_index + block_y * slice.m_num_blocks_x + block_x;
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}
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uint32_t get_total_blocks(uint32_t slice_index) const
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{
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return m_slices[slice_index].m_num_blocks_x * m_slices[slice_index].m_num_blocks_y;
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}
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uint32_t get_total_blocks() const
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{
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uint32_t total_blocks = 0;
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for (uint32_t i = 0; i < m_slices.size(); i++)
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total_blocks += get_total_blocks(i);
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return total_blocks;
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}
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// Returns the total number of input texels, not counting padding up to blocks/macroblocks.
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uint32_t get_total_input_texels(uint32_t slice_index) const
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{
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return m_slices[slice_index].m_orig_width * m_slices[slice_index].m_orig_height;
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}
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uint32_t get_total_input_texels() const
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{
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uint32_t total_texels = 0;
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for (uint32_t i = 0; i < m_slices.size(); i++)
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total_texels += get_total_input_texels(i);
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return total_texels;
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}
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int find_slice(uint32_t block_index, uint32_t *pBlock_x, uint32_t *pBlock_y) const
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{
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for (uint32_t i = 0; i < m_slices.size(); i++)
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{
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if ((block_index >= m_slices[i].m_first_block_index) && (block_index < (m_slices[i].m_first_block_index + m_slices[i].m_num_blocks_x * m_slices[i].m_num_blocks_y)))
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{
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const uint32_t ofs = block_index - m_slices[i].m_first_block_index;
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const uint32_t x = ofs % m_slices[i].m_num_blocks_x;
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const uint32_t y = ofs / m_slices[i].m_num_blocks_x;
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if (pBlock_x) *pBlock_x = x;
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if (pBlock_y) *pBlock_y = y;
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return i;
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}
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}
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return -1;
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}
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void create_endpoint_palette();
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void create_selector_palette();
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// endpoint palette
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// 5:5:5 and predicted 4:4:4 colors, 1 or 2 3-bit intensity table indices
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// selector palette
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// 4x4 2-bit selectors
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// per-macroblock:
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// 4 diff bits
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// 4 flip bits
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// Endpoint template index, 1-8 endpoint indices
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// Alternately, if no template applies, we can send 4 ETC1S bits followed by 4-8 endpoint indices
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// 4 selector indices
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void reoptimize_and_sort_endpoints_codebook(uint32_t total_block_endpoints_remapped, uint_vec &all_endpoint_indices);
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void sort_selector_codebook();
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void create_encoder_blocks();
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void compute_slice_crcs();
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bool encode_image();
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bool encode_endpoint_palette();
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bool encode_selector_palette();
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int find_video_frame(int slice_index, int delta);
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void check_for_valid_cr_blocks();
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};
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} // namespace basisu
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