1181 lines
34 KiB
C++
1181 lines
34 KiB
C++
// basis_etc.h
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// Copyright (C) 2019-2021 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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namespace basisu
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{
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enum etc_constants
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{
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cETC1BytesPerBlock = 8U,
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cETC1SelectorBits = 2U,
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cETC1SelectorValues = 1U << cETC1SelectorBits,
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cETC1SelectorMask = cETC1SelectorValues - 1U,
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cETC1BlockShift = 2U,
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cETC1BlockSize = 1U << cETC1BlockShift,
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cETC1LSBSelectorIndicesBitOffset = 0,
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cETC1MSBSelectorIndicesBitOffset = 16,
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cETC1FlipBitOffset = 32,
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cETC1DiffBitOffset = 33,
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cETC1IntenModifierNumBits = 3,
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cETC1IntenModifierValues = 1 << cETC1IntenModifierNumBits,
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cETC1RightIntenModifierTableBitOffset = 34,
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cETC1LeftIntenModifierTableBitOffset = 37,
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// Base+Delta encoding (5 bit bases, 3 bit delta)
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cETC1BaseColorCompNumBits = 5,
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cETC1BaseColorCompMax = 1 << cETC1BaseColorCompNumBits,
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cETC1DeltaColorCompNumBits = 3,
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cETC1DeltaColorComp = 1 << cETC1DeltaColorCompNumBits,
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cETC1DeltaColorCompMax = 1 << cETC1DeltaColorCompNumBits,
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cETC1BaseColor5RBitOffset = 59,
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cETC1BaseColor5GBitOffset = 51,
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cETC1BaseColor5BBitOffset = 43,
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cETC1DeltaColor3RBitOffset = 56,
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cETC1DeltaColor3GBitOffset = 48,
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cETC1DeltaColor3BBitOffset = 40,
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// Absolute (non-delta) encoding (two 4-bit per component bases)
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cETC1AbsColorCompNumBits = 4,
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cETC1AbsColorCompMax = 1 << cETC1AbsColorCompNumBits,
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cETC1AbsColor4R1BitOffset = 60,
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cETC1AbsColor4G1BitOffset = 52,
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cETC1AbsColor4B1BitOffset = 44,
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cETC1AbsColor4R2BitOffset = 56,
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cETC1AbsColor4G2BitOffset = 48,
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cETC1AbsColor4B2BitOffset = 40,
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cETC1ColorDeltaMin = -4,
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cETC1ColorDeltaMax = 3,
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// Delta3:
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// 0 1 2 3 4 5 6 7
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// 000 001 010 011 100 101 110 111
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// 0 1 2 3 -4 -3 -2 -1
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};
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extern const int g_etc1_inten_tables[cETC1IntenModifierValues][cETC1SelectorValues];
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extern const uint8_t g_etc1_to_selector_index[cETC1SelectorValues];
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extern const uint8_t g_selector_index_to_etc1[cETC1SelectorValues];
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struct etc_coord2
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{
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uint8_t m_x, m_y;
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};
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extern const etc_coord2 g_etc1_pixel_coords[2][2][8]; // [flipped][subblock][subblock_pixel]
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extern const uint32_t g_etc1_pixel_indices[2][2][8]; // [flipped][subblock][subblock_pixel]
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struct etc_block
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{
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// big endian uint64:
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// bit ofs: 56 48 40 32 24 16 8 0
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// byte ofs: b0, b1, b2, b3, b4, b5, b6, b7
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union
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{
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uint64_t m_uint64;
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uint8_t m_bytes[8];
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};
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inline void clear()
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{
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assert(sizeof(*this) == 8);
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clear_obj(*this);
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}
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inline uint64_t get_all_bits() const
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{
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return read_be64(&m_uint64);
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}
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inline uint32_t get_general_bits(uint32_t ofs, uint32_t num) const
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{
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assert((ofs + num) <= 64U);
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assert(num && (num < 32U));
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return (uint32_t)(read_be64(&m_uint64) >> ofs) & ((1UL << num) - 1UL);
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}
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inline void set_general_bits(uint32_t ofs, uint32_t num, uint32_t bits)
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{
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assert((ofs + num) <= 64U);
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assert(num && (num < 32U));
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uint64_t x = read_be64(&m_uint64);
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uint64_t msk = ((1ULL << static_cast<uint64_t>(num)) - 1ULL) << static_cast<uint64_t>(ofs);
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x &= ~msk;
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x |= (static_cast<uint64_t>(bits) << static_cast<uint64_t>(ofs));
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write_be64(&m_uint64, x);
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}
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inline uint32_t get_byte_bits(uint32_t ofs, uint32_t num) const
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{
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assert((ofs + num) <= 64U);
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assert(num && (num <= 8U));
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assert((ofs >> 3) == ((ofs + num - 1) >> 3));
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const uint32_t byte_ofs = 7 - (ofs >> 3);
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const uint32_t byte_bit_ofs = ofs & 7;
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return (m_bytes[byte_ofs] >> byte_bit_ofs) & ((1 << num) - 1);
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}
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inline void set_byte_bits(uint32_t ofs, uint32_t num, uint32_t bits)
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{
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assert((ofs + num) <= 64U);
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assert(num && (num < 32U));
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assert((ofs >> 3) == ((ofs + num - 1) >> 3));
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assert(bits < (1U << num));
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const uint32_t byte_ofs = 7 - (ofs >> 3);
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const uint32_t byte_bit_ofs = ofs & 7;
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const uint32_t mask = (1 << num) - 1;
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m_bytes[byte_ofs] &= ~(mask << byte_bit_ofs);
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m_bytes[byte_ofs] |= (bits << byte_bit_ofs);
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}
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// false = left/right subblocks
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// true = upper/lower subblocks
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inline bool get_flip_bit() const
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{
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return (m_bytes[3] & 1) != 0;
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}
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inline void set_flip_bit(bool flip)
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{
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m_bytes[3] &= ~1;
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m_bytes[3] |= static_cast<uint8_t>(flip);
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}
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inline bool get_diff_bit() const
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{
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return (m_bytes[3] & 2) != 0;
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}
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inline void set_diff_bit(bool diff)
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{
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m_bytes[3] &= ~2;
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m_bytes[3] |= (static_cast<uint32_t>(diff) << 1);
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}
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// Returns intensity modifier table (0-7) used by subblock subblock_id.
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// subblock_id=0 left/top (CW 1), 1=right/bottom (CW 2)
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inline uint32_t get_inten_table(uint32_t subblock_id) const
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{
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assert(subblock_id < 2);
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const uint32_t ofs = subblock_id ? 2 : 5;
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return (m_bytes[3] >> ofs) & 7;
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}
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// Sets intensity modifier table (0-7) used by subblock subblock_id (0 or 1)
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inline void set_inten_table(uint32_t subblock_id, uint32_t t)
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{
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assert(subblock_id < 2);
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assert(t < 8);
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const uint32_t ofs = subblock_id ? 2 : 5;
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m_bytes[3] &= ~(7 << ofs);
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m_bytes[3] |= (t << ofs);
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}
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inline void set_inten_tables_etc1s(uint32_t t)
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{
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set_inten_table(0, t);
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set_inten_table(1, t);
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}
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inline bool is_etc1s() const
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{
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if (get_inten_table(0) != get_inten_table(1))
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return false;
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if (get_diff_bit())
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{
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if (get_delta3_color() != 0)
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return false;
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}
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else
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{
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if (get_base4_color(0) != get_base4_color(1))
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return false;
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}
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return true;
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}
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// Returned encoded selector value ranges from 0-3 (this is NOT a direct index into g_etc1_inten_tables, see get_selector())
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inline uint32_t get_raw_selector(uint32_t x, uint32_t y) const
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{
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assert((x | y) < 4);
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const uint32_t bit_index = x * 4 + y;
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const uint32_t byte_bit_ofs = bit_index & 7;
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const uint8_t *p = &m_bytes[7 - (bit_index >> 3)];
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const uint32_t lsb = (p[0] >> byte_bit_ofs) & 1;
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const uint32_t msb = (p[-2] >> byte_bit_ofs) & 1;
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const uint32_t val = lsb | (msb << 1);
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return val;
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}
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// Returned selector value ranges from 0-3 and is a direct index into g_etc1_inten_tables.
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inline uint32_t get_selector(uint32_t x, uint32_t y) const
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{
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return g_etc1_to_selector_index[get_raw_selector(x, y)];
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}
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// Selector "val" ranges from 0-3 and is a direct index into g_etc1_inten_tables.
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inline void set_selector(uint32_t x, uint32_t y, uint32_t val)
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{
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assert((x | y | val) < 4);
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const uint32_t bit_index = x * 4 + y;
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uint8_t *p = &m_bytes[7 - (bit_index >> 3)];
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const uint32_t byte_bit_ofs = bit_index & 7;
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const uint32_t mask = 1 << byte_bit_ofs;
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const uint32_t etc1_val = g_selector_index_to_etc1[val];
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const uint32_t lsb = etc1_val & 1;
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const uint32_t msb = etc1_val >> 1;
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p[0] &= ~mask;
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p[0] |= (lsb << byte_bit_ofs);
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p[-2] &= ~mask;
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p[-2] |= (msb << byte_bit_ofs);
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}
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// Selector "etc1_val" ranges from 0-3 and is a direct (raw) ETC1 selector.
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inline void set_raw_selector(uint32_t x, uint32_t y, uint32_t etc1_val)
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{
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assert((x | y | etc1_val) < 4);
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const uint32_t bit_index = x * 4 + y;
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uint8_t* p = &m_bytes[7 - (bit_index >> 3)];
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const uint32_t byte_bit_ofs = bit_index & 7;
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const uint32_t mask = 1 << byte_bit_ofs;
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const uint32_t lsb = etc1_val & 1;
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const uint32_t msb = etc1_val >> 1;
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p[0] &= ~mask;
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p[0] |= (lsb << byte_bit_ofs);
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p[-2] &= ~mask;
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p[-2] |= (msb << byte_bit_ofs);
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}
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inline uint32_t get_raw_selector_bits() const
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{
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return m_bytes[4] | (m_bytes[5] << 8) | (m_bytes[6] << 16) | (m_bytes[7] << 24);
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}
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inline void set_raw_selector_bits(uint32_t bits)
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{
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m_bytes[4] = static_cast<uint8_t>(bits);
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m_bytes[5] = static_cast<uint8_t>(bits >> 8);
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m_bytes[6] = static_cast<uint8_t>(bits >> 16);
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m_bytes[7] = static_cast<uint8_t>(bits >> 24);
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}
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inline void set_raw_selector_bits(uint8_t byte0, uint8_t byte1, uint8_t byte2, uint8_t byte3)
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{
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m_bytes[4] = byte0;
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m_bytes[5] = byte1;
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m_bytes[6] = byte2;
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m_bytes[7] = byte3;
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}
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inline void set_base4_color(uint32_t idx, uint16_t c)
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{
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if (idx)
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{
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set_byte_bits(cETC1AbsColor4R2BitOffset, 4, (c >> 8) & 15);
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set_byte_bits(cETC1AbsColor4G2BitOffset, 4, (c >> 4) & 15);
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set_byte_bits(cETC1AbsColor4B2BitOffset, 4, c & 15);
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}
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else
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{
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set_byte_bits(cETC1AbsColor4R1BitOffset, 4, (c >> 8) & 15);
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set_byte_bits(cETC1AbsColor4G1BitOffset, 4, (c >> 4) & 15);
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set_byte_bits(cETC1AbsColor4B1BitOffset, 4, c & 15);
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}
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}
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inline uint16_t get_base4_color(uint32_t idx) const
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{
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uint32_t r, g, b;
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if (idx)
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{
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r = get_byte_bits(cETC1AbsColor4R2BitOffset, 4);
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g = get_byte_bits(cETC1AbsColor4G2BitOffset, 4);
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b = get_byte_bits(cETC1AbsColor4B2BitOffset, 4);
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}
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else
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{
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r = get_byte_bits(cETC1AbsColor4R1BitOffset, 4);
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g = get_byte_bits(cETC1AbsColor4G1BitOffset, 4);
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b = get_byte_bits(cETC1AbsColor4B1BitOffset, 4);
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}
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return static_cast<uint16_t>(b | (g << 4U) | (r << 8U));
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}
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inline void set_base5_color(uint16_t c)
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{
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set_byte_bits(cETC1BaseColor5RBitOffset, 5, (c >> 10) & 31);
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set_byte_bits(cETC1BaseColor5GBitOffset, 5, (c >> 5) & 31);
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set_byte_bits(cETC1BaseColor5BBitOffset, 5, c & 31);
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}
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inline uint16_t get_base5_color() const
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{
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const uint32_t r = get_byte_bits(cETC1BaseColor5RBitOffset, 5);
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const uint32_t g = get_byte_bits(cETC1BaseColor5GBitOffset, 5);
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const uint32_t b = get_byte_bits(cETC1BaseColor5BBitOffset, 5);
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return static_cast<uint16_t>(b | (g << 5U) | (r << 10U));
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}
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void set_delta3_color(uint16_t c)
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{
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set_byte_bits(cETC1DeltaColor3RBitOffset, 3, (c >> 6) & 7);
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set_byte_bits(cETC1DeltaColor3GBitOffset, 3, (c >> 3) & 7);
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set_byte_bits(cETC1DeltaColor3BBitOffset, 3, c & 7);
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}
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inline uint16_t get_delta3_color() const
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{
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const uint32_t r = get_byte_bits(cETC1DeltaColor3RBitOffset, 3);
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const uint32_t g = get_byte_bits(cETC1DeltaColor3GBitOffset, 3);
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const uint32_t b = get_byte_bits(cETC1DeltaColor3BBitOffset, 3);
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return static_cast<uint16_t>(b | (g << 3U) | (r << 6U));
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}
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uint64_t determine_selectors(const color_rgba* pSource_pixels, bool perceptual, uint32_t begin_subblock = 0, uint32_t end_subblock = 2)
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{
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uint64_t total_error = 0;
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for (uint32_t subblock = begin_subblock; subblock < end_subblock; subblock++)
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{
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color_rgba block_colors[4];
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get_block_colors(block_colors, subblock);
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if (get_flip_bit())
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{
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for (uint32_t y = 0; y < 2; y++)
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{
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for (uint32_t x = 0; x < 4; x++)
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{
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uint32_t best_selector = 0;
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uint64_t best_error = UINT64_MAX;
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for (uint32_t s = 0; s < 4; s++)
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{
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uint64_t err = color_distance(perceptual, block_colors[s], pSource_pixels[x + (subblock * 2 + y) * 4], false);
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if (err < best_error)
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{
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best_error = err;
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best_selector = s;
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}
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}
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set_selector(x, subblock * 2 + y, best_selector);
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total_error += best_error;
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}
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}
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}
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else
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{
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for (uint32_t y = 0; y < 4; y++)
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{
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for (uint32_t x = 0; x < 2; x++)
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{
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uint32_t best_selector = 0;
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uint64_t best_error = UINT64_MAX;
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for (uint32_t s = 0; s < 4; s++)
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{
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uint64_t err = color_distance(perceptual, block_colors[s], pSource_pixels[(subblock * 2) + x + y * 4], false);
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if (err < best_error)
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{
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best_error = err;
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best_selector = s;
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}
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}
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set_selector(subblock * 2 + x, y, best_selector);
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total_error += best_error;
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}
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}
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}
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}
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return total_error;
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}
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color_rgba get_block_color(uint32_t subblock_index, bool scaled) const
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{
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color_rgba b;
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if (get_diff_bit())
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{
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if (subblock_index)
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unpack_color5(b, get_base5_color(), get_delta3_color(), scaled);
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else
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unpack_color5(b, get_base5_color(), scaled);
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}
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else
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{
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b = unpack_color4(get_base4_color(subblock_index), scaled);
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}
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return b;
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}
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uint32_t get_subblock_index(uint32_t x, uint32_t y) const
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{
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if (get_flip_bit())
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return y >= 2;
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else
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return x >= 2;
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}
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bool get_block_colors(color_rgba* pBlock_colors, uint32_t subblock_index) const
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{
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color_rgba b;
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if (get_diff_bit())
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{
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if (subblock_index)
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unpack_color5(b, get_base5_color(), get_delta3_color(), true);
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else
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unpack_color5(b, get_base5_color(), true);
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}
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else
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{
|
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b = unpack_color4(get_base4_color(subblock_index), true);
|
|
}
|
|
|
|
const int* pInten_table = g_etc1_inten_tables[get_inten_table(subblock_index)];
|
|
|
|
bool dc = false;
|
|
|
|
pBlock_colors[0].set(clamp255(b.r + pInten_table[0], dc), clamp255(b.g + pInten_table[0], dc), clamp255(b.b + pInten_table[0], dc), 255);
|
|
pBlock_colors[1].set(clamp255(b.r + pInten_table[1], dc), clamp255(b.g + pInten_table[1], dc), clamp255(b.b + pInten_table[1], dc), 255);
|
|
pBlock_colors[2].set(clamp255(b.r + pInten_table[2], dc), clamp255(b.g + pInten_table[2], dc), clamp255(b.b + pInten_table[2], dc), 255);
|
|
pBlock_colors[3].set(clamp255(b.r + pInten_table[3], dc), clamp255(b.g + pInten_table[3], dc), clamp255(b.b + pInten_table[3], dc), 255);
|
|
|
|
return dc;
|
|
}
|
|
|
|
void get_block_colors_etc1s(color_rgba* pBlock_colors) const
|
|
{
|
|
color_rgba b;
|
|
|
|
unpack_color5(b, get_base5_color(), true);
|
|
|
|
const int* pInten_table = g_etc1_inten_tables[get_inten_table(0)];
|
|
|
|
pBlock_colors[0].set(clamp255(b.r + pInten_table[0]), clamp255(b.g + pInten_table[0]), clamp255(b.b + pInten_table[0]), 255);
|
|
pBlock_colors[1].set(clamp255(b.r + pInten_table[1]), clamp255(b.g + pInten_table[1]), clamp255(b.b + pInten_table[1]), 255);
|
|
pBlock_colors[2].set(clamp255(b.r + pInten_table[2]), clamp255(b.g + pInten_table[2]), clamp255(b.b + pInten_table[2]), 255);
|
|
pBlock_colors[3].set(clamp255(b.r + pInten_table[3]), clamp255(b.g + pInten_table[3]), clamp255(b.b + pInten_table[3]), 255);
|
|
}
|
|
|
|
static void get_block_colors_etc1s(color_rgba* pBlock_colors, const color_rgba &base5_color, uint32_t inten_table)
|
|
{
|
|
color_rgba b;
|
|
b.r = (base5_color.r << 3U) | (base5_color.r >> 2U);
|
|
b.g = (base5_color.g << 3U) | (base5_color.g >> 2U);
|
|
b.b = (base5_color.b << 3U) | (base5_color.b >> 2U);
|
|
|
|
const int* pInten_table = g_etc1_inten_tables[inten_table];
|
|
|
|
pBlock_colors[0].set(clamp255(b.r + pInten_table[0]), clamp255(b.g + pInten_table[0]), clamp255(b.b + pInten_table[0]), 255);
|
|
pBlock_colors[1].set(clamp255(b.r + pInten_table[1]), clamp255(b.g + pInten_table[1]), clamp255(b.b + pInten_table[1]), 255);
|
|
pBlock_colors[2].set(clamp255(b.r + pInten_table[2]), clamp255(b.g + pInten_table[2]), clamp255(b.b + pInten_table[2]), 255);
|
|
pBlock_colors[3].set(clamp255(b.r + pInten_table[3]), clamp255(b.g + pInten_table[3]), clamp255(b.b + pInten_table[3]), 255);
|
|
}
|
|
|
|
void get_block_color(color_rgba& color, uint32_t subblock_index, uint32_t selector_index) const
|
|
{
|
|
color_rgba b;
|
|
|
|
if (get_diff_bit())
|
|
{
|
|
if (subblock_index)
|
|
unpack_color5(b, get_base5_color(), get_delta3_color(), true);
|
|
else
|
|
unpack_color5(b, get_base5_color(), true);
|
|
}
|
|
else
|
|
{
|
|
b = unpack_color4(get_base4_color(subblock_index), true);
|
|
}
|
|
|
|
const int* pInten_table = g_etc1_inten_tables[get_inten_table(subblock_index)];
|
|
|
|
color.set(clamp255(b.r + pInten_table[selector_index]), clamp255(b.g + pInten_table[selector_index]), clamp255(b.b + pInten_table[selector_index]), 255);
|
|
}
|
|
|
|
bool get_block_low_high_colors(color_rgba* pBlock_colors, uint32_t subblock_index) const
|
|
{
|
|
color_rgba b;
|
|
|
|
if (get_diff_bit())
|
|
{
|
|
if (subblock_index)
|
|
unpack_color5(b, get_base5_color(), get_delta3_color(), true);
|
|
else
|
|
unpack_color5(b, get_base5_color(), true);
|
|
}
|
|
else
|
|
{
|
|
b = unpack_color4(get_base4_color(subblock_index), true);
|
|
}
|
|
|
|
const int* pInten_table = g_etc1_inten_tables[get_inten_table(subblock_index)];
|
|
|
|
bool dc = false;
|
|
|
|
pBlock_colors[0].set(clamp255(b.r + pInten_table[0], dc), clamp255(b.g + pInten_table[0], dc), clamp255(b.b + pInten_table[0], dc), 255);
|
|
pBlock_colors[1].set(clamp255(b.r + pInten_table[3], dc), clamp255(b.g + pInten_table[3], dc), clamp255(b.b + pInten_table[3], dc), 255);
|
|
|
|
return dc;
|
|
}
|
|
|
|
static void get_block_colors5(color_rgba *pBlock_colors, const color_rgba &base_color5, uint32_t inten_table, bool scaled = false)
|
|
{
|
|
color_rgba b(base_color5);
|
|
|
|
if (!scaled)
|
|
{
|
|
b.r = (b.r << 3) | (b.r >> 2);
|
|
b.g = (b.g << 3) | (b.g >> 2);
|
|
b.b = (b.b << 3) | (b.b >> 2);
|
|
}
|
|
|
|
const int* pInten_table = g_etc1_inten_tables[inten_table];
|
|
|
|
pBlock_colors[0].set(clamp255(b.r + pInten_table[0]), clamp255(b.g + pInten_table[0]), clamp255(b.b + pInten_table[0]), 255);
|
|
pBlock_colors[1].set(clamp255(b.r + pInten_table[1]), clamp255(b.g + pInten_table[1]), clamp255(b.b + pInten_table[1]), 255);
|
|
pBlock_colors[2].set(clamp255(b.r + pInten_table[2]), clamp255(b.g + pInten_table[2]), clamp255(b.b + pInten_table[2]), 255);
|
|
pBlock_colors[3].set(clamp255(b.r + pInten_table[3]), clamp255(b.g + pInten_table[3]), clamp255(b.b + pInten_table[3]), 255);
|
|
}
|
|
|
|
static void get_block_colors4(color_rgba *pBlock_colors, const color_rgba &base_color4, uint32_t inten_table, bool scaled = false)
|
|
{
|
|
color_rgba b(base_color4);
|
|
|
|
if (!scaled)
|
|
{
|
|
b.r = (b.r << 4) | b.r;
|
|
b.g = (b.g << 4) | b.g;
|
|
b.b = (b.b << 4) | b.b;
|
|
}
|
|
|
|
const int* pInten_table = g_etc1_inten_tables[inten_table];
|
|
|
|
pBlock_colors[0].set(clamp255(b.r + pInten_table[0]), clamp255(b.g + pInten_table[0]), clamp255(b.b + pInten_table[0]), 255);
|
|
pBlock_colors[1].set(clamp255(b.r + pInten_table[1]), clamp255(b.g + pInten_table[1]), clamp255(b.b + pInten_table[1]), 255);
|
|
pBlock_colors[2].set(clamp255(b.r + pInten_table[2]), clamp255(b.g + pInten_table[2]), clamp255(b.b + pInten_table[2]), 255);
|
|
pBlock_colors[3].set(clamp255(b.r + pInten_table[3]), clamp255(b.g + pInten_table[3]), clamp255(b.b + pInten_table[3]), 255);
|
|
}
|
|
|
|
uint64_t evaluate_etc1_error(const color_rgba* pBlock_pixels, bool perceptual, int subblock_index = -1) const;
|
|
void get_subblock_pixels(color_rgba* pPixels, int subblock_index = -1) const;
|
|
|
|
void get_selector_range(uint32_t& low, uint32_t& high) const
|
|
{
|
|
low = 3;
|
|
high = 0;
|
|
for (uint32_t y = 0; y < 4; y++)
|
|
{
|
|
for (uint32_t x = 0; x < 4; x++)
|
|
{
|
|
const uint32_t s = get_selector(x, y);
|
|
low = minimum(low, s);
|
|
high = maximum(high, s);
|
|
}
|
|
}
|
|
}
|
|
|
|
void set_block_color4(const color_rgba &c0_unscaled, const color_rgba &c1_unscaled)
|
|
{
|
|
set_diff_bit(false);
|
|
|
|
set_base4_color(0, pack_color4(c0_unscaled, false));
|
|
set_base4_color(1, pack_color4(c1_unscaled, false));
|
|
}
|
|
|
|
void set_block_color5(const color_rgba &c0_unscaled, const color_rgba &c1_unscaled)
|
|
{
|
|
set_diff_bit(true);
|
|
|
|
set_base5_color(pack_color5(c0_unscaled, false));
|
|
|
|
int dr = c1_unscaled.r - c0_unscaled.r;
|
|
int dg = c1_unscaled.g - c0_unscaled.g;
|
|
int db = c1_unscaled.b - c0_unscaled.b;
|
|
|
|
set_delta3_color(pack_delta3(dr, dg, db));
|
|
}
|
|
|
|
void set_block_color5_etc1s(const color_rgba &c_unscaled)
|
|
{
|
|
set_diff_bit(true);
|
|
|
|
set_base5_color(pack_color5(c_unscaled, false));
|
|
set_delta3_color(pack_delta3(0, 0, 0));
|
|
}
|
|
|
|
bool set_block_color5_check(const color_rgba &c0_unscaled, const color_rgba &c1_unscaled)
|
|
{
|
|
set_diff_bit(true);
|
|
|
|
set_base5_color(pack_color5(c0_unscaled, false));
|
|
|
|
int dr = c1_unscaled.r - c0_unscaled.r;
|
|
int dg = c1_unscaled.g - c0_unscaled.g;
|
|
int db = c1_unscaled.b - c0_unscaled.b;
|
|
|
|
if (((dr < cETC1ColorDeltaMin) || (dr > cETC1ColorDeltaMax)) ||
|
|
((dg < cETC1ColorDeltaMin) || (dg > cETC1ColorDeltaMax)) ||
|
|
((db < cETC1ColorDeltaMin) || (db > cETC1ColorDeltaMax)))
|
|
return false;
|
|
|
|
set_delta3_color(pack_delta3(dr, dg, db));
|
|
|
|
return true;
|
|
}
|
|
|
|
bool set_block_color5_clamp(const color_rgba &c0_unscaled, const color_rgba &c1_unscaled)
|
|
{
|
|
set_diff_bit(true);
|
|
set_base5_color(pack_color5(c0_unscaled, false));
|
|
|
|
int dr = c1_unscaled.r - c0_unscaled.r;
|
|
int dg = c1_unscaled.g - c0_unscaled.g;
|
|
int db = c1_unscaled.b - c0_unscaled.b;
|
|
|
|
dr = clamp<int>(dr, cETC1ColorDeltaMin, cETC1ColorDeltaMax);
|
|
dg = clamp<int>(dg, cETC1ColorDeltaMin, cETC1ColorDeltaMax);
|
|
db = clamp<int>(db, cETC1ColorDeltaMin, cETC1ColorDeltaMax);
|
|
|
|
set_delta3_color(pack_delta3(dr, dg, db));
|
|
|
|
return true;
|
|
}
|
|
color_rgba get_selector_color(uint32_t x, uint32_t y, uint32_t s) const
|
|
{
|
|
color_rgba block_colors[4];
|
|
|
|
get_block_colors(block_colors, get_subblock_index(x, y));
|
|
|
|
return block_colors[s];
|
|
}
|
|
|
|
// Base color 5
|
|
static uint16_t pack_color5(const color_rgba& color, bool scaled, uint32_t bias = 127U);
|
|
static uint16_t pack_color5(uint32_t r, uint32_t g, uint32_t b, bool scaled, uint32_t bias = 127U);
|
|
|
|
static color_rgba unpack_color5(uint16_t packed_color5, bool scaled, uint32_t alpha = 255U);
|
|
static void unpack_color5(uint32_t& r, uint32_t& g, uint32_t& b, uint16_t packed_color, bool scaled);
|
|
static void unpack_color5(color_rgba& result, uint16_t packed_color5, bool scaled);
|
|
|
|
static bool unpack_color5(color_rgba& result, uint16_t packed_color5, uint16_t packed_delta3, bool scaled, uint32_t alpha = 255U);
|
|
static bool unpack_color5(uint32_t& r, uint32_t& g, uint32_t& b, uint16_t packed_color5, uint16_t packed_delta3, bool scaled, uint32_t alpha = 255U);
|
|
|
|
// Delta color 3
|
|
// Inputs range from -4 to 3 (cETC1ColorDeltaMin to cETC1ColorDeltaMax)
|
|
static uint16_t pack_delta3(const color_rgba_i16& color);
|
|
static uint16_t pack_delta3(int r, int g, int b);
|
|
|
|
// Results range from -4 to 3 (cETC1ColorDeltaMin to cETC1ColorDeltaMax)
|
|
static color_rgba_i16 unpack_delta3(uint16_t packed_delta3);
|
|
static void unpack_delta3(int& r, int& g, int& b, uint16_t packed_delta3);
|
|
|
|
static bool try_pack_color5_delta3(const color_rgba *pColor5_unscaled)
|
|
{
|
|
int dr = pColor5_unscaled[1].r - pColor5_unscaled[0].r;
|
|
int dg = pColor5_unscaled[1].g - pColor5_unscaled[0].g;
|
|
int db = pColor5_unscaled[1].b - pColor5_unscaled[0].b;
|
|
|
|
if ((minimum(dr, dg, db) < cETC1ColorDeltaMin) || (maximum(dr, dg, db) > cETC1ColorDeltaMax))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
// Abs color 4
|
|
static uint16_t pack_color4(const color_rgba& color, bool scaled, uint32_t bias = 127U);
|
|
static uint16_t pack_color4(uint32_t r, uint32_t g, uint32_t b, bool scaled, uint32_t bias = 127U);
|
|
|
|
static color_rgba unpack_color4(uint16_t packed_color4, bool scaled, uint32_t alpha = 255U);
|
|
static void unpack_color4(uint32_t& r, uint32_t& g, uint32_t& b, uint16_t packed_color4, bool scaled);
|
|
|
|
// subblock colors
|
|
static void get_diff_subblock_colors(color_rgba* pDst, uint16_t packed_color5, uint32_t table_idx);
|
|
static bool get_diff_subblock_colors(color_rgba* pDst, uint16_t packed_color5, uint16_t packed_delta3, uint32_t table_idx);
|
|
static void get_abs_subblock_colors(color_rgba* pDst, uint16_t packed_color4, uint32_t table_idx);
|
|
|
|
static inline void unscaled_to_scaled_color(color_rgba& dst, const color_rgba& src, bool color4)
|
|
{
|
|
if (color4)
|
|
{
|
|
dst.r = src.r | (src.r << 4);
|
|
dst.g = src.g | (src.g << 4);
|
|
dst.b = src.b | (src.b << 4);
|
|
}
|
|
else
|
|
{
|
|
dst.r = (src.r >> 2) | (src.r << 3);
|
|
dst.g = (src.g >> 2) | (src.g << 3);
|
|
dst.b = (src.b >> 2) | (src.b << 3);
|
|
}
|
|
dst.a = src.a;
|
|
}
|
|
|
|
private:
|
|
static uint8_t clamp255(int x, bool &did_clamp)
|
|
{
|
|
if (x < 0)
|
|
{
|
|
did_clamp = true;
|
|
return 0;
|
|
}
|
|
else if (x > 255)
|
|
{
|
|
did_clamp = true;
|
|
return 255;
|
|
}
|
|
|
|
return static_cast<uint8_t>(x);
|
|
}
|
|
|
|
static uint8_t clamp255(int x)
|
|
{
|
|
if (x < 0)
|
|
return 0;
|
|
else if (x > 255)
|
|
return 255;
|
|
|
|
return static_cast<uint8_t>(x);
|
|
}
|
|
};
|
|
|
|
typedef basisu::vector<etc_block> etc_block_vec;
|
|
|
|
// Returns false if the unpack fails (could be bogus data or ETC2)
|
|
bool unpack_etc1(const etc_block& block, color_rgba *pDst, bool preserve_alpha = false);
|
|
|
|
enum basis_etc_quality
|
|
{
|
|
cETCQualityFast,
|
|
cETCQualityMedium,
|
|
cETCQualitySlow,
|
|
cETCQualityUber,
|
|
cETCQualityTotal,
|
|
};
|
|
|
|
struct basis_etc1_pack_params
|
|
{
|
|
basis_etc_quality m_quality;
|
|
bool m_perceptual;
|
|
bool m_cluster_fit;
|
|
bool m_force_etc1s;
|
|
bool m_use_color4;
|
|
float m_flip_bias;
|
|
|
|
inline basis_etc1_pack_params()
|
|
{
|
|
clear();
|
|
}
|
|
|
|
void clear()
|
|
{
|
|
m_quality = cETCQualitySlow;
|
|
m_perceptual = true;
|
|
m_cluster_fit = true;
|
|
m_force_etc1s = false;
|
|
m_use_color4 = true;
|
|
m_flip_bias = 0.0f;
|
|
}
|
|
};
|
|
|
|
struct etc1_solution_coordinates
|
|
{
|
|
inline etc1_solution_coordinates() :
|
|
m_unscaled_color(0, 0, 0, 0),
|
|
m_inten_table(0),
|
|
m_color4(false)
|
|
{
|
|
}
|
|
|
|
inline etc1_solution_coordinates(uint32_t r, uint32_t g, uint32_t b, uint32_t inten_table, bool color4) :
|
|
m_unscaled_color((uint8_t)r, (uint8_t)g, (uint8_t)b, 255),
|
|
m_inten_table((uint8_t)inten_table),
|
|
m_color4(color4)
|
|
{
|
|
}
|
|
|
|
inline etc1_solution_coordinates(const color_rgba& c, uint32_t inten_table, bool color4) :
|
|
m_unscaled_color(c),
|
|
m_inten_table(inten_table),
|
|
m_color4(color4)
|
|
{
|
|
}
|
|
|
|
inline etc1_solution_coordinates(const etc1_solution_coordinates& other)
|
|
{
|
|
*this = other;
|
|
}
|
|
|
|
inline etc1_solution_coordinates& operator= (const etc1_solution_coordinates& rhs)
|
|
{
|
|
m_unscaled_color = rhs.m_unscaled_color;
|
|
m_inten_table = rhs.m_inten_table;
|
|
m_color4 = rhs.m_color4;
|
|
return *this;
|
|
}
|
|
|
|
inline void clear()
|
|
{
|
|
m_unscaled_color.clear();
|
|
m_inten_table = 0;
|
|
m_color4 = false;
|
|
}
|
|
|
|
inline void init(const color_rgba& c, uint32_t inten_table, bool color4)
|
|
{
|
|
m_unscaled_color = c;
|
|
m_inten_table = inten_table;
|
|
m_color4 = color4;
|
|
}
|
|
|
|
inline color_rgba get_scaled_color() const
|
|
{
|
|
int br, bg, bb;
|
|
if (m_color4)
|
|
{
|
|
br = m_unscaled_color.r | (m_unscaled_color.r << 4);
|
|
bg = m_unscaled_color.g | (m_unscaled_color.g << 4);
|
|
bb = m_unscaled_color.b | (m_unscaled_color.b << 4);
|
|
}
|
|
else
|
|
{
|
|
br = (m_unscaled_color.r >> 2) | (m_unscaled_color.r << 3);
|
|
bg = (m_unscaled_color.g >> 2) | (m_unscaled_color.g << 3);
|
|
bb = (m_unscaled_color.b >> 2) | (m_unscaled_color.b << 3);
|
|
}
|
|
return color_rgba((uint8_t)br, (uint8_t)bg, (uint8_t)bb, 255);
|
|
}
|
|
|
|
// returns true if anything was clamped
|
|
inline void get_block_colors(color_rgba* pBlock_colors)
|
|
{
|
|
int br, bg, bb;
|
|
if (m_color4)
|
|
{
|
|
br = m_unscaled_color.r | (m_unscaled_color.r << 4);
|
|
bg = m_unscaled_color.g | (m_unscaled_color.g << 4);
|
|
bb = m_unscaled_color.b | (m_unscaled_color.b << 4);
|
|
}
|
|
else
|
|
{
|
|
br = (m_unscaled_color.r >> 2) | (m_unscaled_color.r << 3);
|
|
bg = (m_unscaled_color.g >> 2) | (m_unscaled_color.g << 3);
|
|
bb = (m_unscaled_color.b >> 2) | (m_unscaled_color.b << 3);
|
|
}
|
|
const int* pInten_table = g_etc1_inten_tables[m_inten_table];
|
|
pBlock_colors[0].set(br + pInten_table[0], bg + pInten_table[0], bb + pInten_table[0], 255);
|
|
pBlock_colors[1].set(br + pInten_table[1], bg + pInten_table[1], bb + pInten_table[1], 255);
|
|
pBlock_colors[2].set(br + pInten_table[2], bg + pInten_table[2], bb + pInten_table[2], 255);
|
|
pBlock_colors[3].set(br + pInten_table[3], bg + pInten_table[3], bb + pInten_table[3], 255);
|
|
}
|
|
|
|
color_rgba m_unscaled_color;
|
|
uint32_t m_inten_table;
|
|
bool m_color4;
|
|
};
|
|
|
|
class etc1_optimizer
|
|
{
|
|
BASISU_NO_EQUALS_OR_COPY_CONSTRUCT(etc1_optimizer);
|
|
|
|
public:
|
|
etc1_optimizer()
|
|
{
|
|
clear();
|
|
}
|
|
|
|
void clear()
|
|
{
|
|
m_pParams = nullptr;
|
|
m_pResult = nullptr;
|
|
m_pSorted_luma = nullptr;
|
|
m_pSorted_luma_indices = nullptr;
|
|
}
|
|
|
|
struct params;
|
|
|
|
typedef bool(*evaluate_solution_override_func)(uint64_t &error, const params &p, const color_rgba* pBlock_colors, const uint8_t* pSelectors, const etc1_solution_coordinates& coords);
|
|
|
|
struct params : basis_etc1_pack_params
|
|
{
|
|
params()
|
|
{
|
|
clear();
|
|
}
|
|
|
|
params(const basis_etc1_pack_params& base_params)
|
|
{
|
|
clear_optimizer_params();
|
|
|
|
*static_cast<basis_etc1_pack_params *>(this) = base_params;
|
|
}
|
|
|
|
void clear()
|
|
{
|
|
clear_optimizer_params();
|
|
}
|
|
|
|
void clear_optimizer_params()
|
|
{
|
|
basis_etc1_pack_params::clear();
|
|
|
|
m_num_src_pixels = 0;
|
|
m_pSrc_pixels = 0;
|
|
|
|
m_use_color4 = false;
|
|
static const int s_default_scan_delta[] = { 0 };
|
|
m_pScan_deltas = s_default_scan_delta;
|
|
m_scan_delta_size = 1;
|
|
|
|
m_base_color5.clear();
|
|
m_constrain_against_base_color5 = false;
|
|
|
|
m_refinement = true;
|
|
|
|
m_pForce_selectors = nullptr;
|
|
}
|
|
|
|
uint32_t m_num_src_pixels;
|
|
const color_rgba* m_pSrc_pixels;
|
|
|
|
bool m_use_color4;
|
|
const int* m_pScan_deltas;
|
|
uint32_t m_scan_delta_size;
|
|
|
|
color_rgba m_base_color5;
|
|
bool m_constrain_against_base_color5;
|
|
|
|
bool m_refinement;
|
|
|
|
const uint8_t* m_pForce_selectors;
|
|
};
|
|
|
|
struct results
|
|
{
|
|
uint64_t m_error;
|
|
color_rgba m_block_color_unscaled;
|
|
uint32_t m_block_inten_table;
|
|
uint32_t m_n;
|
|
uint8_t* m_pSelectors;
|
|
bool m_block_color4;
|
|
|
|
inline results& operator= (const results& rhs)
|
|
{
|
|
m_block_color_unscaled = rhs.m_block_color_unscaled;
|
|
m_block_color4 = rhs.m_block_color4;
|
|
m_block_inten_table = rhs.m_block_inten_table;
|
|
m_error = rhs.m_error;
|
|
memcpy(m_pSelectors, rhs.m_pSelectors, minimum(rhs.m_n, m_n));
|
|
return *this;
|
|
}
|
|
};
|
|
|
|
void init(const params& params, results& result);
|
|
bool compute();
|
|
|
|
const params* get_params() const { return m_pParams; }
|
|
|
|
private:
|
|
struct potential_solution
|
|
{
|
|
potential_solution() : m_coords(), m_error(UINT64_MAX), m_valid(false)
|
|
{
|
|
}
|
|
|
|
etc1_solution_coordinates m_coords;
|
|
basisu::vector<uint8_t> m_selectors;
|
|
uint64_t m_error;
|
|
bool m_valid;
|
|
|
|
void clear()
|
|
{
|
|
m_coords.clear();
|
|
m_selectors.resize(0);
|
|
m_error = UINT64_MAX;
|
|
m_valid = false;
|
|
}
|
|
|
|
bool are_selectors_all_equal() const
|
|
{
|
|
if (!m_selectors.size())
|
|
return false;
|
|
const uint32_t s = m_selectors[0];
|
|
for (uint32_t i = 1; i < m_selectors.size(); i++)
|
|
if (m_selectors[i] != s)
|
|
return false;
|
|
return true;
|
|
}
|
|
};
|
|
|
|
const params* m_pParams;
|
|
results* m_pResult;
|
|
|
|
int m_limit;
|
|
|
|
vec3F m_avg_color;
|
|
int m_br, m_bg, m_bb;
|
|
int m_max_comp_spread;
|
|
basisu::vector<uint16_t> m_luma;
|
|
basisu::vector<uint32_t> m_sorted_luma;
|
|
basisu::vector<uint32_t> m_sorted_luma_indices;
|
|
const uint32_t* m_pSorted_luma_indices;
|
|
uint32_t* m_pSorted_luma;
|
|
|
|
basisu::vector<uint8_t> m_selectors;
|
|
basisu::vector<uint8_t> m_best_selectors;
|
|
|
|
potential_solution m_best_solution;
|
|
potential_solution m_trial_solution;
|
|
basisu::vector<uint8_t> m_temp_selectors;
|
|
|
|
enum { cSolutionsTriedHashBits = 10, cTotalSolutionsTriedHashSize = 1 << cSolutionsTriedHashBits, cSolutionsTriedHashMask = cTotalSolutionsTriedHashSize - 1 };
|
|
uint8_t m_solutions_tried[cTotalSolutionsTriedHashSize / 8];
|
|
|
|
void get_nearby_inten_tables(uint32_t idx, int &first_inten_table, int &last_inten_table)
|
|
{
|
|
first_inten_table = maximum<int>(idx - 1, 0);
|
|
last_inten_table = minimum<int>(cETC1IntenModifierValues, idx + 1);
|
|
}
|
|
|
|
bool check_for_redundant_solution(const etc1_solution_coordinates& coords);
|
|
bool evaluate_solution_slow(const etc1_solution_coordinates& coords, potential_solution& trial_solution, potential_solution* pBest_solution);
|
|
bool evaluate_solution_fast(const etc1_solution_coordinates& coords, potential_solution& trial_solution, potential_solution* pBest_solution);
|
|
|
|
inline bool evaluate_solution(const etc1_solution_coordinates& coords, potential_solution& trial_solution, potential_solution* pBest_solution)
|
|
{
|
|
if (m_pParams->m_quality >= cETCQualityMedium)
|
|
return evaluate_solution_slow(coords, trial_solution, pBest_solution);
|
|
else
|
|
return evaluate_solution_fast(coords, trial_solution, pBest_solution);
|
|
}
|
|
|
|
void refine_solution(uint32_t max_refinement_trials);
|
|
void compute_internal_neighborhood(int scan_r, int scan_g, int scan_b);
|
|
void compute_internal_cluster_fit(uint32_t total_perms_to_try);
|
|
};
|
|
|
|
struct pack_etc1_block_context
|
|
{
|
|
etc1_optimizer m_optimizer;
|
|
};
|
|
|
|
void pack_etc1_solid_color_init();
|
|
uint64_t pack_etc1_block_solid_color(etc_block& block, const uint8_t* pColor);
|
|
|
|
// ETC EAC
|
|
extern const int8_t g_etc2_eac_tables[16][8];
|
|
extern const int8_t g_etc2_eac_tables8[16][8];
|
|
|
|
const uint32_t ETC2_EAC_MIN_VALUE_SELECTOR = 3, ETC2_EAC_MAX_VALUE_SELECTOR = 7;
|
|
|
|
struct eac_a8_block
|
|
{
|
|
uint16_t m_base : 8;
|
|
uint16_t m_table : 4;
|
|
uint16_t m_multiplier : 4;
|
|
|
|
uint8_t m_selectors[6];
|
|
|
|
inline uint32_t get_selector(uint32_t x, uint32_t y, uint64_t selector_bits) const
|
|
{
|
|
assert((x < 4) && (y < 4));
|
|
return static_cast<uint32_t>((selector_bits >> (45 - (y + x * 4) * 3)) & 7);
|
|
}
|
|
|
|
inline uint64_t get_selector_bits() const
|
|
{
|
|
uint64_t pixels = ((uint64_t)m_selectors[0] << 40) | ((uint64_t)m_selectors[1] << 32) | ((uint64_t)m_selectors[2] << 24) | ((uint64_t)m_selectors[3] << 16) | ((uint64_t)m_selectors[4] << 8) | m_selectors[5];
|
|
return pixels;
|
|
}
|
|
|
|
inline void set_selector_bits(uint64_t pixels)
|
|
{
|
|
m_selectors[0] = (uint8_t)(pixels >> 40);
|
|
m_selectors[1] = (uint8_t)(pixels >> 32);
|
|
m_selectors[2] = (uint8_t)(pixels >> 24);
|
|
m_selectors[3] = (uint8_t)(pixels >> 16);
|
|
m_selectors[4] = (uint8_t)(pixels >> 8);
|
|
m_selectors[5] = (uint8_t)(pixels);
|
|
}
|
|
|
|
void set_selector(uint32_t x, uint32_t y, uint32_t s)
|
|
{
|
|
assert((x < 4) && (y < 4) && (s < 8));
|
|
|
|
const uint32_t ofs = 45 - (y + x * 4) * 3;
|
|
|
|
uint64_t pixels = get_selector_bits();
|
|
|
|
pixels &= ~(7ULL << ofs);
|
|
pixels |= (static_cast<uint64_t>(s) << ofs);
|
|
|
|
set_selector_bits(pixels);
|
|
}
|
|
};
|
|
|
|
struct etc2_rgba_block
|
|
{
|
|
eac_a8_block m_alpha;
|
|
etc_block m_rgb;
|
|
};
|
|
|
|
struct pack_eac_a8_results
|
|
{
|
|
uint32_t m_base;
|
|
uint32_t m_table;
|
|
uint32_t m_multiplier;
|
|
uint8_vec m_selectors;
|
|
uint8_vec m_selectors_temp;
|
|
};
|
|
|
|
uint64_t pack_eac_a8(pack_eac_a8_results& results, const uint8_t* pPixels, uint32_t num_pixels, uint32_t base_search_rad, uint32_t mul_search_rad, uint32_t table_mask = UINT32_MAX);
|
|
void pack_eac_a8(eac_a8_block* pBlock, const uint8_t* pPixels, uint32_t base_search_rad, uint32_t mul_search_rad, uint32_t table_mask = UINT32_MAX);
|
|
|
|
} // namespace basisu
|