mirror of https://github.com/axmolengine/axmol.git
503 lines
14 KiB
C++
503 lines
14 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// ----------------------------------------------------------------------------
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// Copyright 2011-2021 Arm Limited
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//
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// Licensed under the Apache License, Version 2.0 (the "License"); you may not
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// use this file except in compliance with the License. You may obtain a copy
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// 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, WITHOUT
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// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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// License for the specific language governing permissions and limitations
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// under the License.
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// ----------------------------------------------------------------------------
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/**
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* @brief Functions for converting between symbolic and physical encodings.
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*/
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#include "astcenc_internal.h"
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#include <cassert>
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/**
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* @brief Write up to 8 bits at an arbitrary bit offset.
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*
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* The stored value is at most 8 bits, but can be stored at an offset of between 0 and 7 bits so
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* may span two separate bytes in memory.
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*
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* @param value The value to write.
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* @param bitcount The number of bits to write, starting from LSB.
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* @param bitoffset The bit offset to store at, between 0 and 7.
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* @param[in,out] ptr The data pointer to write to.
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*/
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static inline void write_bits(
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int value,
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int bitcount,
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int bitoffset,
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uint8_t* ptr
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) {
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int mask = (1 << bitcount) - 1;
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value &= mask;
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ptr += bitoffset >> 3;
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bitoffset &= 7;
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value <<= bitoffset;
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mask <<= bitoffset;
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mask = ~mask;
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ptr[0] &= mask;
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ptr[0] |= value;
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ptr[1] &= mask >> 8;
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ptr[1] |= value >> 8;
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}
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/**
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* @brief Read up to 8 bits at an arbitrary bit offset.
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*
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* The stored value is at most 8 bits, but can be stored at an offset of between 0 and 7 bits so may
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* span two separate bytes in memory.
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*
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* @param bitcount The number of bits to read.
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* @param bitoffset The bit offset to read from, between 0 and 7.
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* @param[in,out] ptr The data pointer to read from.
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*
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* @return The read value.
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*/
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static inline int read_bits(
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int bitcount,
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int bitoffset,
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const uint8_t* ptr
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) {
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int mask = (1 << bitcount) - 1;
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ptr += bitoffset >> 3;
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bitoffset &= 7;
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int value = ptr[0] | (ptr[1] << 8);
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value >>= bitoffset;
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value &= mask;
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return value;
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}
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/**
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* @brief Reverse bits in a byte.
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*
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* @param p The value to reverse.
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*
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* @return The reversed result.
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*/
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static inline int bitrev8(int p)
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{
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p = ((p & 0x0F) << 4) | ((p >> 4) & 0x0F);
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p = ((p & 0x33) << 2) | ((p >> 2) & 0x33);
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p = ((p & 0x55) << 1) | ((p >> 1) & 0x55);
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return p;
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}
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/* See header for documentation. */
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void symbolic_to_physical(
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const block_size_descriptor& bsd,
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const symbolic_compressed_block& scb,
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physical_compressed_block& pcb
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) {
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assert(scb.block_type != SYM_BTYPE_ERROR);
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// Constant color block using UNORM16 colors
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if (scb.block_type == SYM_BTYPE_CONST_U16)
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{
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// There is currently no attempt to coalesce larger void-extents
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static const uint8_t cbytes[8] { 0xFC, 0xFD, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
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for (unsigned int i = 0; i < 8; i++)
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{
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pcb.data[i] = cbytes[i];
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}
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for (unsigned int i = 0; i < BLOCK_MAX_COMPONENTS; i++)
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{
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pcb.data[2 * i + 8] = scb.constant_color[i] & 0xFF;
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pcb.data[2 * i + 9] = (scb.constant_color[i] >> 8) & 0xFF;
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}
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return;
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}
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// Constant color block using FP16 colors
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if (scb.block_type == SYM_BTYPE_CONST_F16)
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{
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// There is currently no attempt to coalesce larger void-extents
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static const uint8_t cbytes[8] { 0xFC, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
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for (unsigned int i = 0; i < 8; i++)
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{
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pcb.data[i] = cbytes[i];
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}
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for (unsigned int i = 0; i < BLOCK_MAX_COMPONENTS; i++)
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{
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pcb.data[2 * i + 8] = scb.constant_color[i] & 0xFF;
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pcb.data[2 * i + 9] = (scb.constant_color[i] >> 8) & 0xFF;
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}
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return;
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}
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unsigned int partition_count = scb.partition_count;
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// Compress the weights.
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// They are encoded as an ordinary integer-sequence, then bit-reversed
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uint8_t weightbuf[16] { 0 };
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const auto& bm = bsd.get_block_mode(scb.block_mode);
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const auto& di = bsd.get_decimation_info(bm.decimation_mode);
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int weight_count = di.weight_count;
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quant_method weight_quant_method = bm.get_weight_quant_mode();
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int is_dual_plane = bm.is_dual_plane;
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int real_weight_count = is_dual_plane ? 2 * weight_count : weight_count;
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int bits_for_weights = get_ise_sequence_bitcount(real_weight_count, weight_quant_method);
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if (is_dual_plane)
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{
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uint8_t weights[64];
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for (int i = 0; i < weight_count; i++)
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{
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weights[2 * i] = scb.weights[i];
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weights[2 * i + 1] = scb.weights[i + WEIGHTS_PLANE2_OFFSET];
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}
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encode_ise(weight_quant_method, real_weight_count, weights, weightbuf, 0);
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}
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else
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{
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encode_ise(weight_quant_method, weight_count, scb.weights, weightbuf, 0);
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}
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for (int i = 0; i < 16; i++)
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{
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pcb.data[i] = static_cast<uint8_t>(bitrev8(weightbuf[15 - i]));
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}
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write_bits(scb.block_mode, 11, 0, pcb.data);
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write_bits(partition_count - 1, 2, 11, pcb.data);
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int below_weights_pos = 128 - bits_for_weights;
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// Encode partition index and color endpoint types for blocks with 2+ partitions
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if (partition_count > 1)
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{
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write_bits(scb.partition_index, 6, 13, pcb.data);
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write_bits(scb.partition_index >> 6, PARTITION_INDEX_BITS - 6, 19, pcb.data);
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if (scb.color_formats_matched)
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{
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write_bits(scb.color_formats[0] << 2, 6, 13 + PARTITION_INDEX_BITS, pcb.data);
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}
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else
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{
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// Check endpoint types for each partition to determine the lowest class present
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int low_class = 4;
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for (unsigned int i = 0; i < partition_count; i++)
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{
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int class_of_format = scb.color_formats[i] >> 2;
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low_class = astc::min(class_of_format, low_class);
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}
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if (low_class == 3)
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{
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low_class = 2;
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}
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int encoded_type = low_class + 1;
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int bitpos = 2;
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for (unsigned int i = 0; i < partition_count; i++)
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{
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int classbit_of_format = (scb.color_formats[i] >> 2) - low_class;
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encoded_type |= classbit_of_format << bitpos;
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bitpos++;
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}
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for (unsigned int i = 0; i < partition_count; i++)
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{
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int lowbits_of_format = scb.color_formats[i] & 3;
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encoded_type |= lowbits_of_format << bitpos;
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bitpos += 2;
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}
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int encoded_type_lowpart = encoded_type & 0x3F;
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int encoded_type_highpart = encoded_type >> 6;
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int encoded_type_highpart_size = (3 * partition_count) - 4;
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int encoded_type_highpart_pos = 128 - bits_for_weights - encoded_type_highpart_size;
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write_bits(encoded_type_lowpart, 6, 13 + PARTITION_INDEX_BITS, pcb.data);
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write_bits(encoded_type_highpart, encoded_type_highpart_size, encoded_type_highpart_pos, pcb.data);
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below_weights_pos -= encoded_type_highpart_size;
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}
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}
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else
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{
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write_bits(scb.color_formats[0], 4, 13, pcb.data);
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}
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// In dual-plane mode, encode the color component of the second plane of weights
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if (is_dual_plane)
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{
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write_bits(scb.plane2_component, 2, below_weights_pos - 2, pcb.data);
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}
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// Encode the color components
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uint8_t values_to_encode[32];
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int valuecount_to_encode = 0;
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for (unsigned int i = 0; i < scb.partition_count; i++)
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{
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int vals = 2 * (scb.color_formats[i] >> 2) + 2;
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assert(vals <= 8);
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for (int j = 0; j < vals; j++)
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{
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values_to_encode[j + valuecount_to_encode] = scb.color_values[i][j];
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}
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valuecount_to_encode += vals;
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}
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encode_ise(scb.get_color_quant_mode(), valuecount_to_encode, values_to_encode, pcb.data,
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scb.partition_count == 1 ? 17 : 19 + PARTITION_INDEX_BITS);
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}
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/* See header for documentation. */
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void physical_to_symbolic(
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const block_size_descriptor& bsd,
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const physical_compressed_block& pcb,
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symbolic_compressed_block& scb
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) {
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uint8_t bswapped[16];
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scb.block_type = SYM_BTYPE_NONCONST;
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// Extract header fields
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int block_mode = read_bits(11, 0, pcb.data);
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if ((block_mode & 0x1FF) == 0x1FC)
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{
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// Constant color block
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// Check what format the data has
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if (block_mode & 0x200)
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{
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scb.block_type = SYM_BTYPE_CONST_F16;
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}
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else
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{
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scb.block_type = SYM_BTYPE_CONST_U16;
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}
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scb.partition_count = 0;
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for (int i = 0; i < 4; i++)
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{
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scb.constant_color[i] = pcb.data[2 * i + 8] | (pcb.data[2 * i + 9] << 8);
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}
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// Additionally, check that the void-extent
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if (bsd.zdim == 1)
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{
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// 2D void-extent
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int rsvbits = read_bits(2, 10, pcb.data);
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if (rsvbits != 3)
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{
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scb.block_type = SYM_BTYPE_ERROR;
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return;
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}
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int vx_low_s = read_bits(8, 12, pcb.data) | (read_bits(5, 12 + 8, pcb.data) << 8);
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int vx_high_s = read_bits(8, 25, pcb.data) | (read_bits(5, 25 + 8, pcb.data) << 8);
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int vx_low_t = read_bits(8, 38, pcb.data) | (read_bits(5, 38 + 8, pcb.data) << 8);
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int vx_high_t = read_bits(8, 51, pcb.data) | (read_bits(5, 51 + 8, pcb.data) << 8);
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int all_ones = vx_low_s == 0x1FFF && vx_high_s == 0x1FFF && vx_low_t == 0x1FFF && vx_high_t == 0x1FFF;
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if ((vx_low_s >= vx_high_s || vx_low_t >= vx_high_t) && !all_ones)
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{
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scb.block_type = SYM_BTYPE_ERROR;
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return;
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}
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}
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else
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{
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// 3D void-extent
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int vx_low_s = read_bits(9, 10, pcb.data);
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int vx_high_s = read_bits(9, 19, pcb.data);
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int vx_low_t = read_bits(9, 28, pcb.data);
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int vx_high_t = read_bits(9, 37, pcb.data);
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int vx_low_p = read_bits(9, 46, pcb.data);
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int vx_high_p = read_bits(9, 55, pcb.data);
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int all_ones = vx_low_s == 0x1FF && vx_high_s == 0x1FF && vx_low_t == 0x1FF && vx_high_t == 0x1FF && vx_low_p == 0x1FF && vx_high_p == 0x1FF;
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if ((vx_low_s >= vx_high_s || vx_low_t >= vx_high_t || vx_low_p >= vx_high_p) && !all_ones)
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{
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scb.block_type = SYM_BTYPE_ERROR;
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return;
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}
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}
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return;
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}
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unsigned int packed_index = bsd.block_mode_packed_index[block_mode];
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if (packed_index == BLOCK_BAD_BLOCK_MODE)
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{
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scb.block_type = SYM_BTYPE_ERROR;
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return;
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}
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const auto& bm = bsd.get_block_mode(block_mode);
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const auto& di = bsd.get_decimation_info(bm.decimation_mode);
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int weight_count = di.weight_count;
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quant_method weight_quant_method = (quant_method)bm.quant_mode;
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int is_dual_plane = bm.is_dual_plane;
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int real_weight_count = is_dual_plane ? 2 * weight_count : weight_count;
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int partition_count = read_bits(2, 11, pcb.data) + 1;
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scb.block_mode = static_cast<uint16_t>(block_mode);
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scb.partition_count = static_cast<uint8_t>(partition_count);
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for (int i = 0; i < 16; i++)
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{
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bswapped[i] = static_cast<uint8_t>(bitrev8(pcb.data[15 - i]));
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}
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int bits_for_weights = get_ise_sequence_bitcount(real_weight_count, weight_quant_method);
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int below_weights_pos = 128 - bits_for_weights;
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if (is_dual_plane)
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{
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uint8_t indices[64];
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decode_ise(weight_quant_method, real_weight_count, bswapped, indices, 0);
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for (int i = 0; i < weight_count; i++)
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{
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scb.weights[i] = indices[2 * i];
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scb.weights[i + WEIGHTS_PLANE2_OFFSET] = indices[2 * i + 1];
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}
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}
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else
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{
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decode_ise(weight_quant_method, weight_count, bswapped, scb.weights, 0);
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}
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if (is_dual_plane && partition_count == 4)
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{
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scb.block_type = SYM_BTYPE_ERROR;
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return;
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}
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scb.color_formats_matched = 0;
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// Determine the format of each endpoint pair
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int color_formats[BLOCK_MAX_PARTITIONS];
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int encoded_type_highpart_size = 0;
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if (partition_count == 1)
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{
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color_formats[0] = read_bits(4, 13, pcb.data);
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scb.partition_index = 0;
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}
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else
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{
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encoded_type_highpart_size = (3 * partition_count) - 4;
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below_weights_pos -= encoded_type_highpart_size;
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int encoded_type = read_bits(6, 13 + PARTITION_INDEX_BITS, pcb.data) | (read_bits(encoded_type_highpart_size, below_weights_pos, pcb.data) << 6);
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int baseclass = encoded_type & 0x3;
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if (baseclass == 0)
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{
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for (int i = 0; i < partition_count; i++)
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{
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color_formats[i] = (encoded_type >> 2) & 0xF;
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}
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below_weights_pos += encoded_type_highpart_size;
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scb.color_formats_matched = 1;
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encoded_type_highpart_size = 0;
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}
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else
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{
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int bitpos = 2;
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baseclass--;
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for (int i = 0; i < partition_count; i++)
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{
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color_formats[i] = (((encoded_type >> bitpos) & 1) + baseclass) << 2;
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bitpos++;
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}
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for (int i = 0; i < partition_count; i++)
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{
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color_formats[i] |= (encoded_type >> bitpos) & 3;
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bitpos += 2;
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}
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}
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scb.partition_index = static_cast<uint16_t>(read_bits(6, 13, pcb.data) | (read_bits(PARTITION_INDEX_BITS - 6, 19, pcb.data) << 6));
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}
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for (int i = 0; i < partition_count; i++)
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{
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scb.color_formats[i] = static_cast<uint8_t>(color_formats[i]);
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}
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// Determine number of color endpoint integers
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int color_integer_count = 0;
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for (int i = 0; i < partition_count; i++)
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{
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int endpoint_class = color_formats[i] >> 2;
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color_integer_count += (endpoint_class + 1) * 2;
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}
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if (color_integer_count > 18)
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{
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scb.block_type = SYM_BTYPE_ERROR;
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return;
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}
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// Determine the color endpoint format to use
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static const int color_bits_arr[5] { -1, 115 - 4, 113 - 4 - PARTITION_INDEX_BITS, 113 - 4 - PARTITION_INDEX_BITS, 113 - 4 - PARTITION_INDEX_BITS };
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int color_bits = color_bits_arr[partition_count] - bits_for_weights - encoded_type_highpart_size;
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if (is_dual_plane)
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{
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color_bits -= 2;
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}
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if (color_bits < 0)
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{
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color_bits = 0;
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}
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int color_quant_level = quant_mode_table[color_integer_count >> 1][color_bits];
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if (color_quant_level < QUANT_6)
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{
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scb.block_type = SYM_BTYPE_ERROR;
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return;
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}
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// Unpack the integer color values and assign to endpoints
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scb.quant_mode = (quant_method)color_quant_level;
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uint8_t values_to_decode[32];
|
|
decode_ise((quant_method)color_quant_level, color_integer_count, pcb.data, values_to_decode, (partition_count == 1 ? 17 : 19 + PARTITION_INDEX_BITS));
|
|
|
|
int valuecount_to_decode = 0;
|
|
for (int i = 0; i < partition_count; i++)
|
|
{
|
|
int vals = 2 * (color_formats[i] >> 2) + 2;
|
|
for (int j = 0; j < vals; j++)
|
|
{
|
|
scb.color_values[i][j] = values_to_decode[j + valuecount_to_decode];
|
|
}
|
|
valuecount_to_decode += vals;
|
|
}
|
|
|
|
// Fetch component for second-plane in the case of dual plane of weights.
|
|
if (is_dual_plane)
|
|
{
|
|
scb.plane2_component = static_cast<int8_t>(read_bits(2, below_weights_pos - 2, pcb.data));
|
|
}
|
|
}
|