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swiftshader / SwiftShader / ed9d5ae1e79c3ecc3bee8e07e852ba24868d27d5 / . / third_party / astc-encoder / Source / astc_integer_sequence.cpp
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// SPDX-License-Identifier: Apache-2.0
// ----------------------------------------------------------------------------
// Copyright 2011-2020 Arm Limited
//
// 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.
// ----------------------------------------------------------------------------
/**
* @brief Functions for encoding/decoding Bounded Integer Sequence Encoding.
*/
#include "astc_codec_internals.h"
// unpacked quint triplets <low,middle,high> for each packed-quint value
static const uint8_t quints_of_integer[128][3] = {
{0, 0, 0}, {1, 0, 0}, {2, 0, 0}, {3, 0, 0},
{4, 0, 0}, {0, 4, 0}, {4, 4, 0}, {4, 4, 4},
{0, 1, 0}, {1, 1, 0}, {2, 1, 0}, {3, 1, 0},
{4, 1, 0}, {1, 4, 0}, {4, 4, 1}, {4, 4, 4},
{0, 2, 0}, {1, 2, 0}, {2, 2, 0}, {3, 2, 0},
{4, 2, 0}, {2, 4, 0}, {4, 4, 2}, {4, 4, 4},
{0, 3, 0}, {1, 3, 0}, {2, 3, 0}, {3, 3, 0},
{4, 3, 0}, {3, 4, 0}, {4, 4, 3}, {4, 4, 4},
{0, 0, 1}, {1, 0, 1}, {2, 0, 1}, {3, 0, 1},
{4, 0, 1}, {0, 4, 1}, {4, 0, 4}, {0, 4, 4},
{0, 1, 1}, {1, 1, 1}, {2, 1, 1}, {3, 1, 1},
{4, 1, 1}, {1, 4, 1}, {4, 1, 4}, {1, 4, 4},
{0, 2, 1}, {1, 2, 1}, {2, 2, 1}, {3, 2, 1},
{4, 2, 1}, {2, 4, 1}, {4, 2, 4}, {2, 4, 4},
{0, 3, 1}, {1, 3, 1}, {2, 3, 1}, {3, 3, 1},
{4, 3, 1}, {3, 4, 1}, {4, 3, 4}, {3, 4, 4},
{0, 0, 2}, {1, 0, 2}, {2, 0, 2}, {3, 0, 2},
{4, 0, 2}, {0, 4, 2}, {2, 0, 4}, {3, 0, 4},
{0, 1, 2}, {1, 1, 2}, {2, 1, 2}, {3, 1, 2},
{4, 1, 2}, {1, 4, 2}, {2, 1, 4}, {3, 1, 4},
{0, 2, 2}, {1, 2, 2}, {2, 2, 2}, {3, 2, 2},
{4, 2, 2}, {2, 4, 2}, {2, 2, 4}, {3, 2, 4},
{0, 3, 2}, {1, 3, 2}, {2, 3, 2}, {3, 3, 2},
{4, 3, 2}, {3, 4, 2}, {2, 3, 4}, {3, 3, 4},
{0, 0, 3}, {1, 0, 3}, {2, 0, 3}, {3, 0, 3},
{4, 0, 3}, {0, 4, 3}, {0, 0, 4}, {1, 0, 4},
{0, 1, 3}, {1, 1, 3}, {2, 1, 3}, {3, 1, 3},
{4, 1, 3}, {1, 4, 3}, {0, 1, 4}, {1, 1, 4},
{0, 2, 3}, {1, 2, 3}, {2, 2, 3}, {3, 2, 3},
{4, 2, 3}, {2, 4, 3}, {0, 2, 4}, {1, 2, 4},
{0, 3, 3}, {1, 3, 3}, {2, 3, 3}, {3, 3, 3},
{4, 3, 3}, {3, 4, 3}, {0, 3, 4}, {1, 3, 4}
};
// unpacked trit quintuplets <low,_,_,_,high> for each packed-quint value
static const uint8_t trits_of_integer[256][5] = {
{0, 0, 0, 0, 0}, {1, 0, 0, 0, 0}, {2, 0, 0, 0, 0}, {0, 0, 2, 0, 0},
{0, 1, 0, 0, 0}, {1, 1, 0, 0, 0}, {2, 1, 0, 0, 0}, {1, 0, 2, 0, 0},
{0, 2, 0, 0, 0}, {1, 2, 0, 0, 0}, {2, 2, 0, 0, 0}, {2, 0, 2, 0, 0},
{0, 2, 2, 0, 0}, {1, 2, 2, 0, 0}, {2, 2, 2, 0, 0}, {2, 0, 2, 0, 0},
{0, 0, 1, 0, 0}, {1, 0, 1, 0, 0}, {2, 0, 1, 0, 0}, {0, 1, 2, 0, 0},
{0, 1, 1, 0, 0}, {1, 1, 1, 0, 0}, {2, 1, 1, 0, 0}, {1, 1, 2, 0, 0},
{0, 2, 1, 0, 0}, {1, 2, 1, 0, 0}, {2, 2, 1, 0, 0}, {2, 1, 2, 0, 0},
{0, 0, 0, 2, 2}, {1, 0, 0, 2, 2}, {2, 0, 0, 2, 2}, {0, 0, 2, 2, 2},
{0, 0, 0, 1, 0}, {1, 0, 0, 1, 0}, {2, 0, 0, 1, 0}, {0, 0, 2, 1, 0},
{0, 1, 0, 1, 0}, {1, 1, 0, 1, 0}, {2, 1, 0, 1, 0}, {1, 0, 2, 1, 0},
{0, 2, 0, 1, 0}, {1, 2, 0, 1, 0}, {2, 2, 0, 1, 0}, {2, 0, 2, 1, 0},
{0, 2, 2, 1, 0}, {1, 2, 2, 1, 0}, {2, 2, 2, 1, 0}, {2, 0, 2, 1, 0},
{0, 0, 1, 1, 0}, {1, 0, 1, 1, 0}, {2, 0, 1, 1, 0}, {0, 1, 2, 1, 0},
{0, 1, 1, 1, 0}, {1, 1, 1, 1, 0}, {2, 1, 1, 1, 0}, {1, 1, 2, 1, 0},
{0, 2, 1, 1, 0}, {1, 2, 1, 1, 0}, {2, 2, 1, 1, 0}, {2, 1, 2, 1, 0},
{0, 1, 0, 2, 2}, {1, 1, 0, 2, 2}, {2, 1, 0, 2, 2}, {1, 0, 2, 2, 2},
{0, 0, 0, 2, 0}, {1, 0, 0, 2, 0}, {2, 0, 0, 2, 0}, {0, 0, 2, 2, 0},
{0, 1, 0, 2, 0}, {1, 1, 0, 2, 0}, {2, 1, 0, 2, 0}, {1, 0, 2, 2, 0},
{0, 2, 0, 2, 0}, {1, 2, 0, 2, 0}, {2, 2, 0, 2, 0}, {2, 0, 2, 2, 0},
{0, 2, 2, 2, 0}, {1, 2, 2, 2, 0}, {2, 2, 2, 2, 0}, {2, 0, 2, 2, 0},
{0, 0, 1, 2, 0}, {1, 0, 1, 2, 0}, {2, 0, 1, 2, 0}, {0, 1, 2, 2, 0},
{0, 1, 1, 2, 0}, {1, 1, 1, 2, 0}, {2, 1, 1, 2, 0}, {1, 1, 2, 2, 0},
{0, 2, 1, 2, 0}, {1, 2, 1, 2, 0}, {2, 2, 1, 2, 0}, {2, 1, 2, 2, 0},
{0, 2, 0, 2, 2}, {1, 2, 0, 2, 2}, {2, 2, 0, 2, 2}, {2, 0, 2, 2, 2},
{0, 0, 0, 0, 2}, {1, 0, 0, 0, 2}, {2, 0, 0, 0, 2}, {0, 0, 2, 0, 2},
{0, 1, 0, 0, 2}, {1, 1, 0, 0, 2}, {2, 1, 0, 0, 2}, {1, 0, 2, 0, 2},
{0, 2, 0, 0, 2}, {1, 2, 0, 0, 2}, {2, 2, 0, 0, 2}, {2, 0, 2, 0, 2},
{0, 2, 2, 0, 2}, {1, 2, 2, 0, 2}, {2, 2, 2, 0, 2}, {2, 0, 2, 0, 2},
{0, 0, 1, 0, 2}, {1, 0, 1, 0, 2}, {2, 0, 1, 0, 2}, {0, 1, 2, 0, 2},
{0, 1, 1, 0, 2}, {1, 1, 1, 0, 2}, {2, 1, 1, 0, 2}, {1, 1, 2, 0, 2},
{0, 2, 1, 0, 2}, {1, 2, 1, 0, 2}, {2, 2, 1, 0, 2}, {2, 1, 2, 0, 2},
{0, 2, 2, 2, 2}, {1, 2, 2, 2, 2}, {2, 2, 2, 2, 2}, {2, 0, 2, 2, 2},
{0, 0, 0, 0, 1}, {1, 0, 0, 0, 1}, {2, 0, 0, 0, 1}, {0, 0, 2, 0, 1},
{0, 1, 0, 0, 1}, {1, 1, 0, 0, 1}, {2, 1, 0, 0, 1}, {1, 0, 2, 0, 1},
{0, 2, 0, 0, 1}, {1, 2, 0, 0, 1}, {2, 2, 0, 0, 1}, {2, 0, 2, 0, 1},
{0, 2, 2, 0, 1}, {1, 2, 2, 0, 1}, {2, 2, 2, 0, 1}, {2, 0, 2, 0, 1},
{0, 0, 1, 0, 1}, {1, 0, 1, 0, 1}, {2, 0, 1, 0, 1}, {0, 1, 2, 0, 1},
{0, 1, 1, 0, 1}, {1, 1, 1, 0, 1}, {2, 1, 1, 0, 1}, {1, 1, 2, 0, 1},
{0, 2, 1, 0, 1}, {1, 2, 1, 0, 1}, {2, 2, 1, 0, 1}, {2, 1, 2, 0, 1},
{0, 0, 1, 2, 2}, {1, 0, 1, 2, 2}, {2, 0, 1, 2, 2}, {0, 1, 2, 2, 2},
{0, 0, 0, 1, 1}, {1, 0, 0, 1, 1}, {2, 0, 0, 1, 1}, {0, 0, 2, 1, 1},
{0, 1, 0, 1, 1}, {1, 1, 0, 1, 1}, {2, 1, 0, 1, 1}, {1, 0, 2, 1, 1},
{0, 2, 0, 1, 1}, {1, 2, 0, 1, 1}, {2, 2, 0, 1, 1}, {2, 0, 2, 1, 1},
{0, 2, 2, 1, 1}, {1, 2, 2, 1, 1}, {2, 2, 2, 1, 1}, {2, 0, 2, 1, 1},
{0, 0, 1, 1, 1}, {1, 0, 1, 1, 1}, {2, 0, 1, 1, 1}, {0, 1, 2, 1, 1},
{0, 1, 1, 1, 1}, {1, 1, 1, 1, 1}, {2, 1, 1, 1, 1}, {1, 1, 2, 1, 1},
{0, 2, 1, 1, 1}, {1, 2, 1, 1, 1}, {2, 2, 1, 1, 1}, {2, 1, 2, 1, 1},
{0, 1, 1, 2, 2}, {1, 1, 1, 2, 2}, {2, 1, 1, 2, 2}, {1, 1, 2, 2, 2},
{0, 0, 0, 2, 1}, {1, 0, 0, 2, 1}, {2, 0, 0, 2, 1}, {0, 0, 2, 2, 1},
{0, 1, 0, 2, 1}, {1, 1, 0, 2, 1}, {2, 1, 0, 2, 1}, {1, 0, 2, 2, 1},
{0, 2, 0, 2, 1}, {1, 2, 0, 2, 1}, {2, 2, 0, 2, 1}, {2, 0, 2, 2, 1},
{0, 2, 2, 2, 1}, {1, 2, 2, 2, 1}, {2, 2, 2, 2, 1}, {2, 0, 2, 2, 1},
{0, 0, 1, 2, 1}, {1, 0, 1, 2, 1}, {2, 0, 1, 2, 1}, {0, 1, 2, 2, 1},
{0, 1, 1, 2, 1}, {1, 1, 1, 2, 1}, {2, 1, 1, 2, 1}, {1, 1, 2, 2, 1},
{0, 2, 1, 2, 1}, {1, 2, 1, 2, 1}, {2, 2, 1, 2, 1}, {2, 1, 2, 2, 1},
{0, 2, 1, 2, 2}, {1, 2, 1, 2, 2}, {2, 2, 1, 2, 2}, {2, 1, 2, 2, 2},
{0, 0, 0, 1, 2}, {1, 0, 0, 1, 2}, {2, 0, 0, 1, 2}, {0, 0, 2, 1, 2},
{0, 1, 0, 1, 2}, {1, 1, 0, 1, 2}, {2, 1, 0, 1, 2}, {1, 0, 2, 1, 2},
{0, 2, 0, 1, 2}, {1, 2, 0, 1, 2}, {2, 2, 0, 1, 2}, {2, 0, 2, 1, 2},
{0, 2, 2, 1, 2}, {1, 2, 2, 1, 2}, {2, 2, 2, 1, 2}, {2, 0, 2, 1, 2},
{0, 0, 1, 1, 2}, {1, 0, 1, 1, 2}, {2, 0, 1, 1, 2}, {0, 1, 2, 1, 2},
{0, 1, 1, 1, 2}, {1, 1, 1, 1, 2}, {2, 1, 1, 1, 2}, {1, 1, 2, 1, 2},
{0, 2, 1, 1, 2}, {1, 2, 1, 1, 2}, {2, 2, 1, 1, 2}, {2, 1, 2, 1, 2},
{0, 2, 2, 2, 2}, {1, 2, 2, 2, 2}, {2, 2, 2, 2, 2}, {2, 1, 2, 2, 2}
};
void find_number_of_bits_trits_quints(
int quantization_level,
int* bits,
int* trits,
int* quints
) {
*bits = 0;
*trits = 0;
*quints = 0;
switch (quantization_level)
{
case QUANT_2:
*bits = 1;
break;
case QUANT_3:
*bits = 0;
*trits = 1;
break;
case QUANT_4:
*bits = 2;
break;
case QUANT_5:
*bits = 0;
*quints = 1;
break;
case QUANT_6:
*bits = 1;
*trits = 1;
break;
case QUANT_8:
*bits = 3;
break;
case QUANT_10:
*bits = 1;
*quints = 1;
break;
case QUANT_12:
*bits = 2;
*trits = 1;
break;
case QUANT_16:
*bits = 4;
break;
case QUANT_20:
*bits = 2;
*quints = 1;
break;
case QUANT_24:
*bits = 3;
*trits = 1;
break;
case QUANT_32:
*bits = 5;
break;
case QUANT_40:
*bits = 3;
*quints = 1;
break;
case QUANT_48:
*bits = 4;
*trits = 1;
break;
case QUANT_64:
*bits = 6;
break;
case QUANT_80:
*bits = 4;
*quints = 1;
break;
case QUANT_96:
*bits = 5;
*trits = 1;
break;
case QUANT_128:
*bits = 7;
break;
case QUANT_160:
*bits = 5;
*quints = 1;
break;
case QUANT_192:
*bits = 6;
*trits = 1;
break;
case QUANT_256:
*bits = 8;
break;
}
}
// routine to read up to 8 bits
static inline int read_bits(
int bitcount,
int bitoffset,
const uint8_t* ptr
) {
int mask = (1 << bitcount) - 1;
ptr += bitoffset >> 3;
bitoffset &= 7;
int value = ptr[0] | (ptr[1] << 8);
value >>= bitoffset;
value &= mask;
return value;
}
void decode_ise(
int quantization_level,
int elements,
const uint8_t* input_data,
uint8_t* output_data,
int bit_offset
) {
int i;
// note: due to how the trit/quint-block unpacking is done in this function,
// we may write more temporary results than the number of outputs
// The maximum actual number of results is 64 bit, but we keep 4 additional elements
// of padding.
uint8_t results[68];
uint8_t tq_blocks[22]; // trit-blocks or quint-blocks
int bits, trits, quints;
find_number_of_bits_trits_quints(quantization_level, &bits, &trits, &quints);
int lcounter = 0;
int hcounter = 0;
// trit-blocks or quint-blocks must be zeroed out before we collect them in the loop below.
for (i = 0; i < 22; i++)
tq_blocks[i] = 0;
// collect bits for each element, as well as bits for any trit-blocks and quint-blocks.
for (i = 0; i < elements; i++)
{
results[i] = read_bits(bits, bit_offset, input_data);
bit_offset += bits;
if (trits)
{
static const int bits_to_read[5] = { 2, 2, 1, 2, 1 };
static const int block_shift[5] = { 0, 2, 4, 5, 7 };
static const int next_lcounter[5] = { 1, 2, 3, 4, 0 };
static const int hcounter_incr[5] = { 0, 0, 0, 0, 1 };
int tdata = read_bits(bits_to_read[lcounter], bit_offset, input_data);
bit_offset += bits_to_read[lcounter];
tq_blocks[hcounter] |= tdata << block_shift[lcounter];
hcounter += hcounter_incr[lcounter];
lcounter = next_lcounter[lcounter];
}
if (quints)
{
static const int bits_to_read[3] = { 3, 2, 2 };
static const int block_shift[3] = { 0, 3, 5 };
static const int next_lcounter[3] = { 1, 2, 0 };
static const int hcounter_incr[3] = { 0, 0, 1 };
int tdata = read_bits(bits_to_read[lcounter], bit_offset, input_data);
bit_offset += bits_to_read[lcounter];
tq_blocks[hcounter] |= tdata << block_shift[lcounter];
hcounter += hcounter_incr[lcounter];
lcounter = next_lcounter[lcounter];
}
}
// unpack trit-blocks or quint-blocks as needed
if (trits)
{
int trit_blocks = (elements + 4) / 5;
for (i = 0; i < trit_blocks; i++)
{
const uint8_t *tritptr = trits_of_integer[tq_blocks[i]];
results[5 * i] |= tritptr[0] << bits;
results[5 * i + 1] |= tritptr[1] << bits;
results[5 * i + 2] |= tritptr[2] << bits;
results[5 * i + 3] |= tritptr[3] << bits;
results[5 * i + 4] |= tritptr[4] << bits;
}
}
if (quints)
{
int quint_blocks = (elements + 2) / 3;
for (i = 0; i < quint_blocks; i++)
{
const uint8_t *quintptr = quints_of_integer[tq_blocks[i]];
results[3 * i] |= quintptr[0] << bits;
results[3 * i + 1] |= quintptr[1] << bits;
results[3 * i + 2] |= quintptr[2] << bits;
}
}
for (i = 0; i < elements; i++)
output_data[i] = results[i];
}
int compute_ise_bitcount(
int items,
quantization_method quant
) {
switch (quant)
{
case QUANT_2:
return items;
case QUANT_3:
return (8 * items + 4) / 5;
case QUANT_4:
return 2 * items;
case QUANT_5:
return (7 * items + 2) / 3;
case QUANT_6:
return (13 * items + 4) / 5;
case QUANT_8:
return 3 * items;
case QUANT_10:
return (10 * items + 2) / 3;
case QUANT_12:
return (18 * items + 4) / 5;
case QUANT_16:
return items * 4;
case QUANT_20:
return (13 * items + 2) / 3;
case QUANT_24:
return (23 * items + 4) / 5;
case QUANT_32:
return 5 * items;
case QUANT_40:
return (16 * items + 2) / 3;
case QUANT_48:
return (28 * items + 4) / 5;
case QUANT_64:
return 6 * items;
case QUANT_80:
return (19 * items + 2) / 3;
case QUANT_96:
return (33 * items + 4) / 5;
case QUANT_128:
return 7 * items;
case QUANT_160:
return (22 * items + 2) / 3;
case QUANT_192:
return (38 * items + 4) / 5;
case QUANT_256:
return 8 * items;
default:
return 100000;
}
}