| // basis_etc.h |
| // Copyright (C) 2019-2021 Binomial LLC. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| #pragma once |
| #include "../transcoder/basisu.h" |
| #include "basisu_enc.h" |
| |
| namespace basisu |
| { |
| enum etc_constants |
| { |
| cETC1BytesPerBlock = 8U, |
| |
| cETC1SelectorBits = 2U, |
| cETC1SelectorValues = 1U << cETC1SelectorBits, |
| cETC1SelectorMask = cETC1SelectorValues - 1U, |
| |
| cETC1BlockShift = 2U, |
| cETC1BlockSize = 1U << cETC1BlockShift, |
| |
| cETC1LSBSelectorIndicesBitOffset = 0, |
| cETC1MSBSelectorIndicesBitOffset = 16, |
| |
| cETC1FlipBitOffset = 32, |
| cETC1DiffBitOffset = 33, |
| |
| cETC1IntenModifierNumBits = 3, |
| cETC1IntenModifierValues = 1 << cETC1IntenModifierNumBits, |
| cETC1RightIntenModifierTableBitOffset = 34, |
| cETC1LeftIntenModifierTableBitOffset = 37, |
| |
| // Base+Delta encoding (5 bit bases, 3 bit delta) |
| cETC1BaseColorCompNumBits = 5, |
| cETC1BaseColorCompMax = 1 << cETC1BaseColorCompNumBits, |
| |
| cETC1DeltaColorCompNumBits = 3, |
| cETC1DeltaColorComp = 1 << cETC1DeltaColorCompNumBits, |
| cETC1DeltaColorCompMax = 1 << cETC1DeltaColorCompNumBits, |
| |
| cETC1BaseColor5RBitOffset = 59, |
| cETC1BaseColor5GBitOffset = 51, |
| cETC1BaseColor5BBitOffset = 43, |
| |
| cETC1DeltaColor3RBitOffset = 56, |
| cETC1DeltaColor3GBitOffset = 48, |
| cETC1DeltaColor3BBitOffset = 40, |
| |
| // Absolute (non-delta) encoding (two 4-bit per component bases) |
| cETC1AbsColorCompNumBits = 4, |
| cETC1AbsColorCompMax = 1 << cETC1AbsColorCompNumBits, |
| |
| cETC1AbsColor4R1BitOffset = 60, |
| cETC1AbsColor4G1BitOffset = 52, |
| cETC1AbsColor4B1BitOffset = 44, |
| |
| cETC1AbsColor4R2BitOffset = 56, |
| cETC1AbsColor4G2BitOffset = 48, |
| cETC1AbsColor4B2BitOffset = 40, |
| |
| cETC1ColorDeltaMin = -4, |
| cETC1ColorDeltaMax = 3, |
| |
| // Delta3: |
| // 0 1 2 3 4 5 6 7 |
| // 000 001 010 011 100 101 110 111 |
| // 0 1 2 3 -4 -3 -2 -1 |
| }; |
| |
| extern const int g_etc1_inten_tables[cETC1IntenModifierValues][cETC1SelectorValues]; |
| extern const uint8_t g_etc1_to_selector_index[cETC1SelectorValues]; |
| extern const uint8_t g_selector_index_to_etc1[cETC1SelectorValues]; |
| |
| struct etc_coord2 |
| { |
| uint8_t m_x, m_y; |
| }; |
| extern const etc_coord2 g_etc1_pixel_coords[2][2][8]; // [flipped][subblock][subblock_pixel] |
| extern const uint32_t g_etc1_pixel_indices[2][2][8]; // [flipped][subblock][subblock_pixel] |
| |
| struct etc_block |
| { |
| // big endian uint64: |
| // bit ofs: 56 48 40 32 24 16 8 0 |
| // byte ofs: b0, b1, b2, b3, b4, b5, b6, b7 |
| union |
| { |
| uint64_t m_uint64; |
| |
| uint8_t m_bytes[8]; |
| }; |
| |
| inline void clear() |
| { |
| assert(sizeof(*this) == 8); |
| clear_obj(*this); |
| } |
| |
| inline uint64_t get_all_bits() const |
| { |
| return read_be64(&m_uint64); |
| } |
| |
| inline uint32_t get_general_bits(uint32_t ofs, uint32_t num) const |
| { |
| assert((ofs + num) <= 64U); |
| assert(num && (num < 32U)); |
| return (uint32_t)(read_be64(&m_uint64) >> ofs) & ((1UL << num) - 1UL); |
| } |
| |
| inline void set_general_bits(uint32_t ofs, uint32_t num, uint32_t bits) |
| { |
| assert((ofs + num) <= 64U); |
| assert(num && (num < 32U)); |
| |
| uint64_t x = read_be64(&m_uint64); |
| uint64_t msk = ((1ULL << static_cast<uint64_t>(num)) - 1ULL) << static_cast<uint64_t>(ofs); |
| x &= ~msk; |
| x |= (static_cast<uint64_t>(bits) << static_cast<uint64_t>(ofs)); |
| write_be64(&m_uint64, x); |
| } |
| |
| inline uint32_t get_byte_bits(uint32_t ofs, uint32_t num) const |
| { |
| assert((ofs + num) <= 64U); |
| assert(num && (num <= 8U)); |
| assert((ofs >> 3) == ((ofs + num - 1) >> 3)); |
| const uint32_t byte_ofs = 7 - (ofs >> 3); |
| const uint32_t byte_bit_ofs = ofs & 7; |
| return (m_bytes[byte_ofs] >> byte_bit_ofs) & ((1 << num) - 1); |
| } |
| |
| inline void set_byte_bits(uint32_t ofs, uint32_t num, uint32_t bits) |
| { |
| assert((ofs + num) <= 64U); |
| assert(num && (num < 32U)); |
| assert((ofs >> 3) == ((ofs + num - 1) >> 3)); |
| assert(bits < (1U << num)); |
| const uint32_t byte_ofs = 7 - (ofs >> 3); |
| const uint32_t byte_bit_ofs = ofs & 7; |
| const uint32_t mask = (1 << num) - 1; |
| m_bytes[byte_ofs] &= ~(mask << byte_bit_ofs); |
| m_bytes[byte_ofs] |= (bits << byte_bit_ofs); |
| } |
| |
| // false = left/right subblocks |
| // true = upper/lower subblocks |
| inline bool get_flip_bit() const |
| { |
| return (m_bytes[3] & 1) != 0; |
| } |
| |
| inline void set_flip_bit(bool flip) |
| { |
| m_bytes[3] &= ~1; |
| m_bytes[3] |= static_cast<uint8_t>(flip); |
| } |
| |
| inline bool get_diff_bit() const |
| { |
| return (m_bytes[3] & 2) != 0; |
| } |
| |
| inline void set_diff_bit(bool diff) |
| { |
| m_bytes[3] &= ~2; |
| m_bytes[3] |= (static_cast<uint32_t>(diff) << 1); |
| } |
| |
| // Returns intensity modifier table (0-7) used by subblock subblock_id. |
| // subblock_id=0 left/top (CW 1), 1=right/bottom (CW 2) |
| inline uint32_t get_inten_table(uint32_t subblock_id) const |
| { |
| assert(subblock_id < 2); |
| const uint32_t ofs = subblock_id ? 2 : 5; |
| return (m_bytes[3] >> ofs) & 7; |
| } |
| |
| // Sets intensity modifier table (0-7) used by subblock subblock_id (0 or 1) |
| inline void set_inten_table(uint32_t subblock_id, uint32_t t) |
| { |
| assert(subblock_id < 2); |
| assert(t < 8); |
| const uint32_t ofs = subblock_id ? 2 : 5; |
| m_bytes[3] &= ~(7 << ofs); |
| m_bytes[3] |= (t << ofs); |
| } |
| |
| inline void set_inten_tables_etc1s(uint32_t t) |
| { |
| set_inten_table(0, t); |
| set_inten_table(1, t); |
| } |
| |
| inline bool is_etc1s() const |
| { |
| if (get_inten_table(0) != get_inten_table(1)) |
| return false; |
| |
| if (get_diff_bit()) |
| { |
| if (get_delta3_color() != 0) |
| return false; |
| } |
| else |
| { |
| if (get_base4_color(0) != get_base4_color(1)) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| // Returned encoded selector value ranges from 0-3 (this is NOT a direct index into g_etc1_inten_tables, see get_selector()) |
| inline uint32_t get_raw_selector(uint32_t x, uint32_t y) const |
| { |
| assert((x | y) < 4); |
| |
| const uint32_t bit_index = x * 4 + y; |
| const uint32_t byte_bit_ofs = bit_index & 7; |
| const uint8_t *p = &m_bytes[7 - (bit_index >> 3)]; |
| const uint32_t lsb = (p[0] >> byte_bit_ofs) & 1; |
| const uint32_t msb = (p[-2] >> byte_bit_ofs) & 1; |
| const uint32_t val = lsb | (msb << 1); |
| |
| return val; |
| } |
| |
| // Returned selector value ranges from 0-3 and is a direct index into g_etc1_inten_tables. |
| inline uint32_t get_selector(uint32_t x, uint32_t y) const |
| { |
| return g_etc1_to_selector_index[get_raw_selector(x, y)]; |
| } |
| |
| // Selector "val" ranges from 0-3 and is a direct index into g_etc1_inten_tables. |
| inline void set_selector(uint32_t x, uint32_t y, uint32_t val) |
| { |
| assert((x | y | val) < 4); |
| const uint32_t bit_index = x * 4 + y; |
| |
| uint8_t *p = &m_bytes[7 - (bit_index >> 3)]; |
| |
| const uint32_t byte_bit_ofs = bit_index & 7; |
| const uint32_t mask = 1 << byte_bit_ofs; |
| |
| const uint32_t etc1_val = g_selector_index_to_etc1[val]; |
| |
| const uint32_t lsb = etc1_val & 1; |
| const uint32_t msb = etc1_val >> 1; |
| |
| p[0] &= ~mask; |
| p[0] |= (lsb << byte_bit_ofs); |
| |
| p[-2] &= ~mask; |
| p[-2] |= (msb << byte_bit_ofs); |
| } |
| |
| // Selector "etc1_val" ranges from 0-3 and is a direct (raw) ETC1 selector. |
| inline void set_raw_selector(uint32_t x, uint32_t y, uint32_t etc1_val) |
| { |
| assert((x | y | etc1_val) < 4); |
| const uint32_t bit_index = x * 4 + y; |
| |
| uint8_t* p = &m_bytes[7 - (bit_index >> 3)]; |
| |
| const uint32_t byte_bit_ofs = bit_index & 7; |
| const uint32_t mask = 1 << byte_bit_ofs; |
| |
| const uint32_t lsb = etc1_val & 1; |
| const uint32_t msb = etc1_val >> 1; |
| |
| p[0] &= ~mask; |
| p[0] |= (lsb << byte_bit_ofs); |
| |
| p[-2] &= ~mask; |
| p[-2] |= (msb << byte_bit_ofs); |
| } |
| |
| inline uint32_t get_raw_selector_bits() const |
| { |
| return m_bytes[4] | (m_bytes[5] << 8) | (m_bytes[6] << 16) | (m_bytes[7] << 24); |
| } |
| |
| inline void set_raw_selector_bits(uint32_t bits) |
| { |
| m_bytes[4] = static_cast<uint8_t>(bits); |
| m_bytes[5] = static_cast<uint8_t>(bits >> 8); |
| m_bytes[6] = static_cast<uint8_t>(bits >> 16); |
| m_bytes[7] = static_cast<uint8_t>(bits >> 24); |
| } |
| |
| inline void set_raw_selector_bits(uint8_t byte0, uint8_t byte1, uint8_t byte2, uint8_t byte3) |
| { |
| m_bytes[4] = byte0; |
| m_bytes[5] = byte1; |
| m_bytes[6] = byte2; |
| m_bytes[7] = byte3; |
| } |
| |
| inline void set_base4_color(uint32_t idx, uint16_t c) |
| { |
| if (idx) |
| { |
| set_byte_bits(cETC1AbsColor4R2BitOffset, 4, (c >> 8) & 15); |
| set_byte_bits(cETC1AbsColor4G2BitOffset, 4, (c >> 4) & 15); |
| set_byte_bits(cETC1AbsColor4B2BitOffset, 4, c & 15); |
| } |
| else |
| { |
| set_byte_bits(cETC1AbsColor4R1BitOffset, 4, (c >> 8) & 15); |
| set_byte_bits(cETC1AbsColor4G1BitOffset, 4, (c >> 4) & 15); |
| set_byte_bits(cETC1AbsColor4B1BitOffset, 4, c & 15); |
| } |
| } |
| |
| inline uint16_t get_base4_color(uint32_t idx) const |
| { |
| uint32_t r, g, b; |
| if (idx) |
| { |
| r = get_byte_bits(cETC1AbsColor4R2BitOffset, 4); |
| g = get_byte_bits(cETC1AbsColor4G2BitOffset, 4); |
| b = get_byte_bits(cETC1AbsColor4B2BitOffset, 4); |
| } |
| else |
| { |
| r = get_byte_bits(cETC1AbsColor4R1BitOffset, 4); |
| g = get_byte_bits(cETC1AbsColor4G1BitOffset, 4); |
| b = get_byte_bits(cETC1AbsColor4B1BitOffset, 4); |
| } |
| return static_cast<uint16_t>(b | (g << 4U) | (r << 8U)); |
| } |
| |
| inline void set_base5_color(uint16_t c) |
| { |
| set_byte_bits(cETC1BaseColor5RBitOffset, 5, (c >> 10) & 31); |
| set_byte_bits(cETC1BaseColor5GBitOffset, 5, (c >> 5) & 31); |
| set_byte_bits(cETC1BaseColor5BBitOffset, 5, c & 31); |
| } |
| |
| inline uint16_t get_base5_color() const |
| { |
| const uint32_t r = get_byte_bits(cETC1BaseColor5RBitOffset, 5); |
| const uint32_t g = get_byte_bits(cETC1BaseColor5GBitOffset, 5); |
| const uint32_t b = get_byte_bits(cETC1BaseColor5BBitOffset, 5); |
| return static_cast<uint16_t>(b | (g << 5U) | (r << 10U)); |
| } |
| |
| void set_delta3_color(uint16_t c) |
| { |
| set_byte_bits(cETC1DeltaColor3RBitOffset, 3, (c >> 6) & 7); |
| set_byte_bits(cETC1DeltaColor3GBitOffset, 3, (c >> 3) & 7); |
| set_byte_bits(cETC1DeltaColor3BBitOffset, 3, c & 7); |
| } |
| |
| inline uint16_t get_delta3_color() const |
| { |
| const uint32_t r = get_byte_bits(cETC1DeltaColor3RBitOffset, 3); |
| const uint32_t g = get_byte_bits(cETC1DeltaColor3GBitOffset, 3); |
| const uint32_t b = get_byte_bits(cETC1DeltaColor3BBitOffset, 3); |
| return static_cast<uint16_t>(b | (g << 3U) | (r << 6U)); |
| } |
| |
| uint64_t determine_selectors(const color_rgba* pSource_pixels, bool perceptual, uint32_t begin_subblock = 0, uint32_t end_subblock = 2) |
| { |
| uint64_t total_error = 0; |
| |
| for (uint32_t subblock = begin_subblock; subblock < end_subblock; subblock++) |
| { |
| color_rgba block_colors[4]; |
| get_block_colors(block_colors, subblock); |
| |
| if (get_flip_bit()) |
| { |
| for (uint32_t y = 0; y < 2; y++) |
| { |
| for (uint32_t x = 0; x < 4; x++) |
| { |
| uint32_t best_selector = 0; |
| uint64_t best_error = UINT64_MAX; |
| |
| for (uint32_t s = 0; s < 4; s++) |
| { |
| uint64_t err = color_distance(perceptual, block_colors[s], pSource_pixels[x + (subblock * 2 + y) * 4], false); |
| if (err < best_error) |
| { |
| best_error = err; |
| best_selector = s; |
| } |
| } |
| |
| set_selector(x, subblock * 2 + y, best_selector); |
| |
| total_error += best_error; |
| } |
| } |
| } |
| else |
| { |
| for (uint32_t y = 0; y < 4; y++) |
| { |
| for (uint32_t x = 0; x < 2; x++) |
| { |
| uint32_t best_selector = 0; |
| uint64_t best_error = UINT64_MAX; |
| |
| for (uint32_t s = 0; s < 4; s++) |
| { |
| uint64_t err = color_distance(perceptual, block_colors[s], pSource_pixels[(subblock * 2) + x + y * 4], false); |
| if (err < best_error) |
| { |
| best_error = err; |
| best_selector = s; |
| } |
| } |
| |
| set_selector(subblock * 2 + x, y, best_selector); |
| |
| total_error += best_error; |
| } |
| } |
| } |
| } |
| |
| return total_error; |
| } |
| |
| color_rgba get_block_color(uint32_t subblock_index, bool scaled) const |
| { |
| color_rgba b; |
| |
| if (get_diff_bit()) |
| { |
| if (subblock_index) |
| unpack_color5(b, get_base5_color(), get_delta3_color(), scaled); |
| else |
| unpack_color5(b, get_base5_color(), scaled); |
| } |
| else |
| { |
| b = unpack_color4(get_base4_color(subblock_index), scaled); |
| } |
| |
| return b; |
| } |
| |
| uint32_t get_subblock_index(uint32_t x, uint32_t y) const |
| { |
| if (get_flip_bit()) |
| return y >= 2; |
| else |
| return x >= 2; |
| } |
| |
| bool get_block_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[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 |