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/* Copyright (c) 2017-2022 Hans-Kristian Arntzen
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#pragma once
#include <mutex>
#include <unordered_map>
#include <vector>
namespace Granite
{
struct ASTCQuantizationMode
{
uint8_t bits, trits, quints;
};
// In order to decode color endpoints, we need to convert available bits and number of values
// into a format of (bits, trits, quints). A simple LUT texture is a reasonable approach for this.
// Decoders are expected to have some form of LUT to deal with this ...
static const ASTCQuantizationMode astc_quantization_modes[] = {
{ 8, 0, 0 },
{ 6, 1, 0 },
{ 5, 0, 1 },
{ 7, 0, 0 },
{ 5, 1, 0 },
{ 4, 0, 1 },
{ 6, 0, 0 },
{ 4, 1, 0 },
{ 3, 0, 1 },
{ 5, 0, 0 },
{ 3, 1, 0 },
{ 2, 0, 1 },
{ 4, 0, 0 },
{ 2, 1, 0 },
{ 1, 0, 1 },
{ 3, 0, 0 },
{ 1, 1, 0 },
};
constexpr size_t astc_num_quantization_modes = sizeof(astc_quantization_modes) / sizeof(astc_quantization_modes[0]);
static const ASTCQuantizationMode astc_weight_modes[] = {
{ 0, 0, 0 }, // Invalid
{ 0, 0, 0 }, // Invalid
{ 1, 0, 0 },
{ 0, 1, 0 },
{ 2, 0, 0 },
{ 0, 0, 1 },
{ 1, 1, 0 },
{ 3, 0, 0 },
{ 0, 0, 0 }, // Invalid
{ 0, 0, 0 }, // Invalid
{ 1, 0, 1 },
{ 2, 1, 0 },
{ 4, 0, 0 },
{ 2, 0, 1 },
{ 3, 1, 0 },
{ 5, 0, 0 },
};
constexpr size_t astc_num_weight_modes = sizeof(astc_weight_modes) / sizeof(astc_weight_modes[0]);
struct ASTCLutHolder
{
ASTCLutHolder();
void init_color_endpoint();
void init_weight_luts();
void init_trits_quints();
struct
{
size_t unquant_offset = 0;
uint8_t unquant_lut[2048];
uint16_t lut[9][128][4];
size_t unquant_lut_offsets[astc_num_quantization_modes];
} color_endpoint;
struct
{
size_t unquant_offset = 0;
uint8_t unquant_lut[2048];
uint8_t lut[astc_num_weight_modes][4];
} weights;
struct
{
uint16_t trits_quints[256 + 128];
} integer;
struct PartitionTable
{
PartitionTable() = default;
PartitionTable(unsigned width, unsigned height);
std::vector<uint8_t> lut_buffer;
unsigned lut_width = 0;
unsigned lut_height = 0;
};
std::mutex table_lock;
std::unordered_map<unsigned, PartitionTable> tables;
PartitionTable &get_partition_table(unsigned width, unsigned height);
};
ASTCLutHolder &get_astc_luts();
}
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