mirror of https://github.com/axmolengine/axmol.git
2174 lines
77 KiB
C++
2174 lines
77 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// ----------------------------------------------------------------------------
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// Copyright 2011-2023 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 and data declarations.
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*/
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#ifndef ASTCENC_INTERNAL_INCLUDED
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#define ASTCENC_INTERNAL_INCLUDED
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#include <algorithm>
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#include <cstddef>
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#include <cstdint>
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#if defined(ASTCENC_DIAGNOSTICS)
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#include <cstdio>
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#endif
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#include <cstdlib>
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#include "astcenc.h"
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#include "astcenc_mathlib.h"
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#include "astcenc_vecmathlib.h"
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/**
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* @brief Make a promise to the compiler's optimizer.
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*
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* A promise is an expression that the optimizer is can assume is true for to help it generate
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* faster code. Common use cases for this are to promise that a for loop will iterate more than
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* once, or that the loop iteration count is a multiple of a vector length, which avoids pre-loop
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* checks and can avoid loop tails if loops are unrolled by the auto-vectorizer.
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*/
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#if defined(NDEBUG)
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#if !defined(__clang__) && defined(_MSC_VER)
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#define promise(cond) __assume(cond)
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#elif defined(__clang__)
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#if __has_builtin(__builtin_assume)
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#define promise(cond) __builtin_assume(cond)
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#elif __has_builtin(__builtin_unreachable)
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#define promise(cond) if (!(cond)) { __builtin_unreachable(); }
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#else
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#define promise(cond)
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#endif
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#else // Assume GCC
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#define promise(cond) if (!(cond)) { __builtin_unreachable(); }
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#endif
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#else
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#define promise(cond) assert(cond)
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#endif
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/* ============================================================================
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Constants
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============================================================================ */
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#if !defined(ASTCENC_BLOCK_MAX_TEXELS)
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#define ASTCENC_BLOCK_MAX_TEXELS 216 // A 3D 6x6x6 block
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#endif
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/** @brief The maximum number of texels a block can support (6x6x6 block). */
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static constexpr unsigned int BLOCK_MAX_TEXELS { ASTCENC_BLOCK_MAX_TEXELS };
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/** @brief The maximum number of components a block can support. */
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static constexpr unsigned int BLOCK_MAX_COMPONENTS { 4 };
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/** @brief The maximum number of partitions a block can support. */
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static constexpr unsigned int BLOCK_MAX_PARTITIONS { 4 };
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/** @brief The number of partitionings, per partition count, suported by the ASTC format. */
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static constexpr unsigned int BLOCK_MAX_PARTITIONINGS { 1024 };
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/** @brief The maximum number of weights used during partition selection for texel clustering. */
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static constexpr uint8_t BLOCK_MAX_KMEANS_TEXELS { 64 };
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/** @brief The maximum number of weights a block can support. */
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static constexpr unsigned int BLOCK_MAX_WEIGHTS { 64 };
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/** @brief The maximum number of weights a block can support per plane in 2 plane mode. */
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static constexpr unsigned int BLOCK_MAX_WEIGHTS_2PLANE { BLOCK_MAX_WEIGHTS / 2 };
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/** @brief The minimum number of weight bits a candidate encoding must encode. */
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static constexpr unsigned int BLOCK_MIN_WEIGHT_BITS { 24 };
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/** @brief The maximum number of weight bits a candidate encoding can encode. */
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static constexpr unsigned int BLOCK_MAX_WEIGHT_BITS { 96 };
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/** @brief The index indicating a bad (unused) block mode in the remap array. */
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static constexpr uint16_t BLOCK_BAD_BLOCK_MODE { 0xFFFFu };
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/** @brief The index indicating a bad (unused) partitioning in the remap array. */
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static constexpr uint16_t BLOCK_BAD_PARTITIONING { 0xFFFFu };
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/** @brief The number of partition index bits supported by the ASTC format . */
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static constexpr unsigned int PARTITION_INDEX_BITS { 10 };
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/** @brief The offset of the plane 2 weights in shared weight arrays. */
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static constexpr unsigned int WEIGHTS_PLANE2_OFFSET { BLOCK_MAX_WEIGHTS_2PLANE };
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/** @brief The sum of quantized weights for one texel. */
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static constexpr float WEIGHTS_TEXEL_SUM { 16.0f };
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/** @brief The number of block modes supported by the ASTC format. */
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static constexpr unsigned int WEIGHTS_MAX_BLOCK_MODES { 2048 };
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/** @brief The number of weight grid decimation modes supported by the ASTC format. */
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static constexpr unsigned int WEIGHTS_MAX_DECIMATION_MODES { 87 };
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/** @brief The high default error used to initialize error trackers. */
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static constexpr float ERROR_CALC_DEFAULT { 1e30f };
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/**
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* @brief The minimum texel count for a block to use the one partition fast path.
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*
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* This setting skips 4x4 and 5x4 block sizes.
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*/
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static constexpr unsigned int TUNE_MIN_TEXELS_MODE0_FASTPATH { 24 };
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/**
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* @brief The maximum number of candidate encodings tested for each encoding mode.
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*
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* This can be dynamically reduced by the compression quality preset.
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*/
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static constexpr unsigned int TUNE_MAX_TRIAL_CANDIDATES { 8 };
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/**
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* @brief The maximum number of candidate partitionings tested for each encoding mode.
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*
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* This can be dynamically reduced by the compression quality preset.
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*/
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static constexpr unsigned int TUNE_MAX_PARTITIONING_CANDIDATES { 32 };
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/**
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* @brief The maximum quant level using full angular endpoint search method.
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*
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* The angular endpoint search is used to find the min/max weight that should
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* be used for a given quantization level. It is effective but expensive, so
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* we only use it where it has the most value - low quant levels with wide
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* spacing. It is used below TUNE_MAX_ANGULAR_QUANT (inclusive). Above this we
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* assume the min weight is 0.0f, and the max weight is 1.0f.
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*
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* Note the angular algorithm is vectorized, and using QUANT_12 exactly fills
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* one 8-wide vector. Decreasing by one doesn't buy much performance, and
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* increasing by one is disproportionately expensive.
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*/
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static constexpr unsigned int TUNE_MAX_ANGULAR_QUANT { 7 }; /* QUANT_12 */
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static_assert((BLOCK_MAX_TEXELS % ASTCENC_SIMD_WIDTH) == 0,
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"BLOCK_MAX_TEXELS must be multiple of ASTCENC_SIMD_WIDTH");
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static_assert(BLOCK_MAX_TEXELS <= 216,
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"BLOCK_MAX_TEXELS must not be greater than 216");
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static_assert((BLOCK_MAX_WEIGHTS % ASTCENC_SIMD_WIDTH) == 0,
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"BLOCK_MAX_WEIGHTS must be multiple of ASTCENC_SIMD_WIDTH");
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static_assert((WEIGHTS_MAX_BLOCK_MODES % ASTCENC_SIMD_WIDTH) == 0,
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"WEIGHTS_MAX_BLOCK_MODES must be multiple of ASTCENC_SIMD_WIDTH");
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/* ============================================================================
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Commonly used data structures
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============================================================================ */
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/**
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* @brief The ASTC endpoint formats.
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*
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* Note, the values here are used directly in the encoding in the format so do not rearrange.
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*/
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enum endpoint_formats
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{
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FMT_LUMINANCE = 0,
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FMT_LUMINANCE_DELTA = 1,
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FMT_HDR_LUMINANCE_LARGE_RANGE = 2,
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FMT_HDR_LUMINANCE_SMALL_RANGE = 3,
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FMT_LUMINANCE_ALPHA = 4,
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FMT_LUMINANCE_ALPHA_DELTA = 5,
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FMT_RGB_SCALE = 6,
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FMT_HDR_RGB_SCALE = 7,
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FMT_RGB = 8,
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FMT_RGB_DELTA = 9,
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FMT_RGB_SCALE_ALPHA = 10,
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FMT_HDR_RGB = 11,
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FMT_RGBA = 12,
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FMT_RGBA_DELTA = 13,
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FMT_HDR_RGB_LDR_ALPHA = 14,
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FMT_HDR_RGBA = 15
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};
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/**
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* @brief The ASTC quantization methods.
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*
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* Note, the values here are used directly in the encoding in the format so do not rearrange.
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*/
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enum quant_method
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{
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QUANT_2 = 0,
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QUANT_3 = 1,
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QUANT_4 = 2,
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QUANT_5 = 3,
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QUANT_6 = 4,
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QUANT_8 = 5,
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QUANT_10 = 6,
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QUANT_12 = 7,
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QUANT_16 = 8,
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QUANT_20 = 9,
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QUANT_24 = 10,
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QUANT_32 = 11,
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QUANT_40 = 12,
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QUANT_48 = 13,
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QUANT_64 = 14,
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QUANT_80 = 15,
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QUANT_96 = 16,
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QUANT_128 = 17,
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QUANT_160 = 18,
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QUANT_192 = 19,
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QUANT_256 = 20
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};
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/**
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* @brief The number of levels use by an ASTC quantization method.
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*
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* @param method The quantization method
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*
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* @return The number of levels used by @c method.
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*/
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static inline unsigned int get_quant_level(quant_method method)
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{
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switch (method)
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{
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case QUANT_2: return 2;
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case QUANT_3: return 3;
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case QUANT_4: return 4;
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case QUANT_5: return 5;
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case QUANT_6: return 6;
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case QUANT_8: return 8;
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case QUANT_10: return 10;
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case QUANT_12: return 12;
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case QUANT_16: return 16;
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case QUANT_20: return 20;
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case QUANT_24: return 24;
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case QUANT_32: return 32;
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case QUANT_40: return 40;
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case QUANT_48: return 48;
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case QUANT_64: return 64;
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case QUANT_80: return 80;
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case QUANT_96: return 96;
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case QUANT_128: return 128;
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case QUANT_160: return 160;
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case QUANT_192: return 192;
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case QUANT_256: return 256;
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}
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// Unreachable - the enum is fully described
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return 0;
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}
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/**
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* @brief Computed metrics about a partition in a block.
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*/
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struct partition_metrics
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{
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/** @brief The error-weighted average color in the partition. */
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vfloat4 avg;
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/** @brief The dominant error-weighted direction in the partition. */
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vfloat4 dir;
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};
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/**
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* @brief Computed lines for a a three component analysis.
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*/
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struct partition_lines3
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{
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/** @brief Line for uncorrelated chroma. */
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line3 uncor_line;
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/** @brief Line for correlated chroma, passing though the origin. */
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line3 samec_line;
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/** @brief Post-processed line for uncorrelated chroma. */
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processed_line3 uncor_pline;
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/** @brief Post-processed line for correlated chroma, passing though the origin. */
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processed_line3 samec_pline;
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/**
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* @brief The length of the line for uncorrelated chroma.
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*
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* This is used for both the uncorrelated and same chroma lines - they are normally very similar
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* and only used for the relative ranking of partitionings against one another.
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*/
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float line_length;
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};
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/**
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* @brief The partition information for a single partition.
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*
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* ASTC has a total of 1024 candidate partitions for each of 2/3/4 partition counts, although this
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* 1024 includes seeds that generate duplicates of other seeds and seeds that generate completely
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* empty partitions. These are both valid encodings, but astcenc will skip both during compression
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* as they are not useful.
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*/
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struct partition_info
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{
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/** @brief The number of partitions in this partitioning. */
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uint16_t partition_count;
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/** @brief The index (seed) of this partitioning. */
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uint16_t partition_index;
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/**
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* @brief The number of texels in each partition.
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*
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* Note that some seeds result in zero texels assigned to a partition. These are valid, but are
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* skipped by this compressor as there is no point spending bits encoding an unused endpoints.
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*/
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uint8_t partition_texel_count[BLOCK_MAX_PARTITIONS];
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/** @brief The partition of each texel in the block. */
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uint8_t partition_of_texel[BLOCK_MAX_TEXELS];
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/** @brief The list of texels in each partition. */
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uint8_t texels_of_partition[BLOCK_MAX_PARTITIONS][BLOCK_MAX_TEXELS];
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};
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/**
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* @brief The weight grid information for a single decimation pattern.
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*
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* ASTC can store one weight per texel, but is also capable of storing lower resolution weight grids
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* that are interpolated during decompression to assign a with to a texel. Storing fewer weights
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* can free up a substantial amount of bits that we can then spend on more useful things, such as
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* more accurate endpoints and weights, or additional partitions.
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*
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* This data structure is used to store information about a single weight grid decimation pattern,
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* for a single block size.
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*/
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struct decimation_info
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{
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/** @brief The total number of texels in the block. */
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uint8_t texel_count;
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/** @brief The maximum number of stored weights that contribute to each texel, between 1 and 4. */
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uint8_t max_texel_weight_count;
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/** @brief The total number of weights stored. */
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uint8_t weight_count;
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/** @brief The number of stored weights in the X dimension. */
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uint8_t weight_x;
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/** @brief The number of stored weights in the Y dimension. */
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uint8_t weight_y;
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/** @brief The number of stored weights in the Z dimension. */
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uint8_t weight_z;
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/**
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* @brief The number of weights that contribute to each texel.
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* Value is between 1 and 4.
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*/
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uint8_t texel_weight_count[BLOCK_MAX_TEXELS];
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/**
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* @brief The weight index of the N weights that are interpolated for each texel.
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* Stored transposed to improve vectorization.
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*/
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uint8_t texel_weights_tr[4][BLOCK_MAX_TEXELS];
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/**
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* @brief The bilinear contribution of the N weights that are interpolated for each texel.
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* Value is between 0 and 16, stored transposed to improve vectorization.
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*/
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uint8_t texel_weight_contribs_int_tr[4][BLOCK_MAX_TEXELS];
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/**
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* @brief The bilinear contribution of the N weights that are interpolated for each texel.
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* Value is between 0 and 1, stored transposed to improve vectorization.
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*/
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alignas(ASTCENC_VECALIGN) float texel_weight_contribs_float_tr[4][BLOCK_MAX_TEXELS];
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/** @brief The number of texels that each stored weight contributes to. */
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uint8_t weight_texel_count[BLOCK_MAX_WEIGHTS];
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/**
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* @brief The list of texels that use a specific weight index.
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* Stored transposed to improve vectorization.
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*/
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uint8_t weight_texels_tr[BLOCK_MAX_TEXELS][BLOCK_MAX_WEIGHTS];
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/**
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* @brief The bilinear contribution to the N texels that use each weight.
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* Value is between 0 and 1, stored transposed to improve vectorization.
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*/
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alignas(ASTCENC_VECALIGN) float weights_texel_contribs_tr[BLOCK_MAX_TEXELS][BLOCK_MAX_WEIGHTS];
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/**
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* @brief The bilinear contribution to the Nth texel that uses each weight.
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* Value is between 0 and 1, stored transposed to improve vectorization.
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*/
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float texel_contrib_for_weight[BLOCK_MAX_TEXELS][BLOCK_MAX_WEIGHTS];
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};
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/**
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* @brief Metadata for single block mode for a specific block size.
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*/
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struct block_mode
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{
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/** @brief The block mode index in the ASTC encoded form. */
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uint16_t mode_index;
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/** @brief The decimation mode index in the compressor reindexed list. */
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uint8_t decimation_mode;
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/** @brief The weight quantization used by this block mode. */
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uint8_t quant_mode;
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/** @brief The weight quantization used by this block mode. */
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uint8_t weight_bits;
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/** @brief Is a dual weight plane used by this block mode? */
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uint8_t is_dual_plane : 1;
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/**
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* @brief Get the weight quantization used by this block mode.
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*
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* @return The quantization level.
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*/
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inline quant_method get_weight_quant_mode() const
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{
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return static_cast<quant_method>(this->quant_mode);
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}
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};
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/**
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* @brief Metadata for single decimation mode for a specific block size.
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*/
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struct decimation_mode
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{
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/** @brief The max weight precision for 1 plane, or -1 if not supported. */
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int8_t maxprec_1plane;
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/** @brief The max weight precision for 2 planes, or -1 if not supported. */
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int8_t maxprec_2planes;
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/**
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* @brief Bitvector indicating weight quant modes used by active 1 plane block modes.
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*
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* Bit 0 = QUANT_2, Bit 1 = QUANT_3, etc.
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*/
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uint16_t refprec_1plane;
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/**
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* @brief Bitvector indicating weight quant methods used by active 2 plane block modes.
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*
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* Bit 0 = QUANT_2, Bit 1 = QUANT_3, etc.
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*/
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uint16_t refprec_2planes;
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/**
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* @brief Set a 1 plane weight quant as active.
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*
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* @param weight_quant The quant method to set.
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*/
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void set_ref_1plane(quant_method weight_quant)
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{
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refprec_1plane |= (1 << weight_quant);
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}
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/**
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* @brief Test if this mode is active below a given 1 plane weight quant (inclusive).
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*
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* @param max_weight_quant The max quant method to test.
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*/
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bool is_ref_1plane(quant_method max_weight_quant) const
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{
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uint16_t mask = static_cast<uint16_t>((1 << (max_weight_quant + 1)) - 1);
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return (refprec_1plane & mask) != 0;
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}
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/**
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* @brief Set a 2 plane weight quant as active.
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*
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* @param weight_quant The quant method to set.
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*/
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void set_ref_2plane(quant_method weight_quant)
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{
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refprec_2planes |= static_cast<uint16_t>(1 << weight_quant);
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}
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/**
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* @brief Test if this mode is active below a given 2 plane weight quant (inclusive).
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*
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* @param max_weight_quant The max quant method to test.
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*/
|
|
bool is_ref_2plane(quant_method max_weight_quant) const
|
|
{
|
|
uint16_t mask = static_cast<uint16_t>((1 << (max_weight_quant + 1)) - 1);
|
|
return (refprec_2planes & mask) != 0;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @brief Data tables for a single block size.
|
|
*
|
|
* The decimation tables store the information to apply weight grid dimension reductions. We only
|
|
* store the decimation modes that are actually needed by the current context; many of the possible
|
|
* modes will be unused (too many weights for the current block size or disabled by heuristics). The
|
|
* actual number of weights stored is @c decimation_mode_count, and the @c decimation_modes and
|
|
* @c decimation_tables arrays store the active modes contiguously at the start of the array. These
|
|
* entries are not stored in any particular order.
|
|
*
|
|
* The block mode tables store the unpacked block mode settings. Block modes are stored in the
|
|
* compressed block as an 11 bit field, but for any given block size and set of compressor
|
|
* heuristics, only a subset of the block modes will be used. The actual number of block modes
|
|
* stored is indicated in @c block_mode_count, and the @c block_modes array store the active modes
|
|
* contiguously at the start of the array. These entries are stored in incrementing "packed" value
|
|
* order, which doesn't mean much once unpacked. To allow decompressors to reference the packed data
|
|
* efficiently the @c block_mode_packed_index array stores the mapping between physical ID and the
|
|
* actual remapped array index.
|
|
*/
|
|
struct block_size_descriptor
|
|
{
|
|
/** @brief The block X dimension, in texels. */
|
|
uint8_t xdim;
|
|
|
|
/** @brief The block Y dimension, in texels. */
|
|
uint8_t ydim;
|
|
|
|
/** @brief The block Z dimension, in texels. */
|
|
uint8_t zdim;
|
|
|
|
/** @brief The block total texel count. */
|
|
uint8_t texel_count;
|
|
|
|
/**
|
|
* @brief The number of stored decimation modes which are "always" modes.
|
|
*
|
|
* Always modes are stored at the start of the decimation_modes list.
|
|
*/
|
|
unsigned int decimation_mode_count_always;
|
|
|
|
/** @brief The number of stored decimation modes for selected encodings. */
|
|
unsigned int decimation_mode_count_selected;
|
|
|
|
/** @brief The number of stored decimation modes for any encoding. */
|
|
unsigned int decimation_mode_count_all;
|
|
|
|
/**
|
|
* @brief The number of stored block modes which are "always" modes.
|
|
*
|
|
* Always modes are stored at the start of the block_modes list.
|
|
*/
|
|
unsigned int block_mode_count_1plane_always;
|
|
|
|
/** @brief The number of stored block modes for active 1 plane encodings. */
|
|
unsigned int block_mode_count_1plane_selected;
|
|
|
|
/** @brief The number of stored block modes for active 1 and 2 plane encodings. */
|
|
unsigned int block_mode_count_1plane_2plane_selected;
|
|
|
|
/** @brief The number of stored block modes for any encoding. */
|
|
unsigned int block_mode_count_all;
|
|
|
|
/** @brief The number of selected partitionings for 1/2/3/4 partitionings. */
|
|
unsigned int partitioning_count_selected[BLOCK_MAX_PARTITIONS];
|
|
|
|
/** @brief The number of partitionings for 1/2/3/4 partitionings. */
|
|
unsigned int partitioning_count_all[BLOCK_MAX_PARTITIONS];
|
|
|
|
/** @brief The active decimation modes, stored in low indices. */
|
|
decimation_mode decimation_modes[WEIGHTS_MAX_DECIMATION_MODES];
|
|
|
|
/** @brief The active decimation tables, stored in low indices. */
|
|
alignas(ASTCENC_VECALIGN) decimation_info decimation_tables[WEIGHTS_MAX_DECIMATION_MODES];
|
|
|
|
/** @brief The packed block mode array index, or @c BLOCK_BAD_BLOCK_MODE if not active. */
|
|
uint16_t block_mode_packed_index[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The active block modes, stored in low indices. */
|
|
block_mode block_modes[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The active partition tables, stored in low indices per-count. */
|
|
partition_info partitionings[(3 * BLOCK_MAX_PARTITIONINGS) + 1];
|
|
|
|
/**
|
|
* @brief The packed partition table array index, or @c BLOCK_BAD_PARTITIONING if not active.
|
|
*
|
|
* Indexed by partition_count - 2, containing 2, 3 and 4 partitions.
|
|
*/
|
|
uint16_t partitioning_packed_index[3][BLOCK_MAX_PARTITIONINGS];
|
|
|
|
/** @brief The active texels for k-means partition selection. */
|
|
uint8_t kmeans_texels[BLOCK_MAX_KMEANS_TEXELS];
|
|
|
|
/**
|
|
* @brief The canonical 2-partition coverage pattern used during block partition search.
|
|
*
|
|
* Indexed by remapped index, not physical index.
|
|
*/
|
|
uint64_t coverage_bitmaps_2[BLOCK_MAX_PARTITIONINGS][2];
|
|
|
|
/**
|
|
* @brief The canonical 3-partition coverage pattern used during block partition search.
|
|
*
|
|
* Indexed by remapped index, not physical index.
|
|
*/
|
|
uint64_t coverage_bitmaps_3[BLOCK_MAX_PARTITIONINGS][3];
|
|
|
|
/**
|
|
* @brief The canonical 4-partition coverage pattern used during block partition search.
|
|
*
|
|
* Indexed by remapped index, not physical index.
|
|
*/
|
|
uint64_t coverage_bitmaps_4[BLOCK_MAX_PARTITIONINGS][4];
|
|
|
|
/**
|
|
* @brief Get the block mode structure for index @c block_mode.
|
|
*
|
|
* This function can only return block modes that are enabled by the current compressor config.
|
|
* Decompression from an arbitrary source should not use this without first checking that the
|
|
* packed block mode index is not @c BLOCK_BAD_BLOCK_MODE.
|
|
*
|
|
* @param block_mode The packed block mode index.
|
|
*
|
|
* @return The block mode structure.
|
|
*/
|
|
const block_mode& get_block_mode(unsigned int block_mode) const
|
|
{
|
|
unsigned int packed_index = this->block_mode_packed_index[block_mode];
|
|
assert(packed_index != BLOCK_BAD_BLOCK_MODE && packed_index < this->block_mode_count_all);
|
|
return this->block_modes[packed_index];
|
|
}
|
|
|
|
/**
|
|
* @brief Get the decimation mode structure for index @c decimation_mode.
|
|
*
|
|
* This function can only return decimation modes that are enabled by the current compressor
|
|
* config. The mode array is stored packed, but this is only ever indexed by the packed index
|
|
* stored in the @c block_mode and never exists in an unpacked form.
|
|
*
|
|
* @param decimation_mode The packed decimation mode index.
|
|
*
|
|
* @return The decimation mode structure.
|
|
*/
|
|
const decimation_mode& get_decimation_mode(unsigned int decimation_mode) const
|
|
{
|
|
return this->decimation_modes[decimation_mode];
|
|
}
|
|
|
|
/**
|
|
* @brief Get the decimation info structure for index @c decimation_mode.
|
|
*
|
|
* This function can only return decimation modes that are enabled by the current compressor
|
|
* config. The mode array is stored packed, but this is only ever indexed by the packed index
|
|
* stored in the @c block_mode and never exists in an unpacked form.
|
|
*
|
|
* @param decimation_mode The packed decimation mode index.
|
|
*
|
|
* @return The decimation info structure.
|
|
*/
|
|
const decimation_info& get_decimation_info(unsigned int decimation_mode) const
|
|
{
|
|
return this->decimation_tables[decimation_mode];
|
|
}
|
|
|
|
/**
|
|
* @brief Get the partition info table for a given partition count.
|
|
*
|
|
* @param partition_count The number of partitions we want the table for.
|
|
*
|
|
* @return The pointer to the table of 1024 entries (for 2/3/4 parts) or 1 entry (for 1 part).
|
|
*/
|
|
const partition_info* get_partition_table(unsigned int partition_count) const
|
|
{
|
|
if (partition_count == 1)
|
|
{
|
|
partition_count = 5;
|
|
}
|
|
unsigned int index = (partition_count - 2) * BLOCK_MAX_PARTITIONINGS;
|
|
return this->partitionings + index;
|
|
}
|
|
|
|
/**
|
|
* @brief Get the partition info structure for a given partition count and seed.
|
|
*
|
|
* @param partition_count The number of partitions we want the info for.
|
|
* @param index The partition seed (between 0 and 1023).
|
|
*
|
|
* @return The partition info structure.
|
|
*/
|
|
const partition_info& get_partition_info(unsigned int partition_count, unsigned int index) const
|
|
{
|
|
unsigned int packed_index = 0;
|
|
if (partition_count >= 2)
|
|
{
|
|
packed_index = this->partitioning_packed_index[partition_count - 2][index];
|
|
}
|
|
|
|
assert(packed_index != BLOCK_BAD_PARTITIONING && packed_index < this->partitioning_count_all[partition_count - 1]);
|
|
auto& result = get_partition_table(partition_count)[packed_index];
|
|
assert(index == result.partition_index);
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* @brief Get the partition info structure for a given partition count and seed.
|
|
*
|
|
* @param partition_count The number of partitions we want the info for.
|
|
* @param packed_index The raw array offset.
|
|
*
|
|
* @return The partition info structure.
|
|
*/
|
|
const partition_info& get_raw_partition_info(unsigned int partition_count, unsigned int packed_index) const
|
|
{
|
|
assert(packed_index != BLOCK_BAD_PARTITIONING && packed_index < this->partitioning_count_all[partition_count - 1]);
|
|
auto& result = get_partition_table(partition_count)[packed_index];
|
|
return result;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @brief The image data for a single block.
|
|
*
|
|
* The @c data_[rgba] fields store the image data in an encoded SoA float form designed for easy
|
|
* vectorization. Input data is converted to float and stored as values between 0 and 65535. LDR
|
|
* data is stored as direct UNORM data, HDR data is stored as LNS data.
|
|
*
|
|
* The @c rgb_lns and @c alpha_lns fields that assigned a per-texel use of HDR are only used during
|
|
* decompression. The current compressor will always use HDR endpoint formats when in HDR mode.
|
|
*/
|
|
struct image_block
|
|
{
|
|
/** @brief The input (compress) or output (decompress) data for the red color component. */
|
|
alignas(ASTCENC_VECALIGN) float data_r[BLOCK_MAX_TEXELS];
|
|
|
|
/** @brief The input (compress) or output (decompress) data for the green color component. */
|
|
alignas(ASTCENC_VECALIGN) float data_g[BLOCK_MAX_TEXELS];
|
|
|
|
/** @brief The input (compress) or output (decompress) data for the blue color component. */
|
|
alignas(ASTCENC_VECALIGN) float data_b[BLOCK_MAX_TEXELS];
|
|
|
|
/** @brief The input (compress) or output (decompress) data for the alpha color component. */
|
|
alignas(ASTCENC_VECALIGN) float data_a[BLOCK_MAX_TEXELS];
|
|
|
|
/** @brief The number of texels in the block. */
|
|
uint8_t texel_count;
|
|
|
|
/** @brief The original data for texel 0 for constant color block encoding. */
|
|
vfloat4 origin_texel;
|
|
|
|
/** @brief The min component value of all texels in the block. */
|
|
vfloat4 data_min;
|
|
|
|
/** @brief The mean component value of all texels in the block. */
|
|
vfloat4 data_mean;
|
|
|
|
/** @brief The max component value of all texels in the block. */
|
|
vfloat4 data_max;
|
|
|
|
/** @brief The relative error significance of the color channels. */
|
|
vfloat4 channel_weight;
|
|
|
|
/** @brief Is this grayscale block where R == G == B for all texels? */
|
|
bool grayscale;
|
|
|
|
/** @brief Set to 1 if a texel is using HDR RGB endpoints (decompression only). */
|
|
uint8_t rgb_lns[BLOCK_MAX_TEXELS];
|
|
|
|
/** @brief Set to 1 if a texel is using HDR alpha endpoints (decompression only). */
|
|
uint8_t alpha_lns[BLOCK_MAX_TEXELS];
|
|
|
|
/** @brief The X position of this block in the input or output image. */
|
|
unsigned int xpos;
|
|
|
|
/** @brief The Y position of this block in the input or output image. */
|
|
unsigned int ypos;
|
|
|
|
/** @brief The Z position of this block in the input or output image. */
|
|
unsigned int zpos;
|
|
|
|
/**
|
|
* @brief Get an RGBA texel value from the data.
|
|
*
|
|
* @param index The texel index.
|
|
*
|
|
* @return The texel in RGBA component ordering.
|
|
*/
|
|
inline vfloat4 texel(unsigned int index) const
|
|
{
|
|
return vfloat4(data_r[index],
|
|
data_g[index],
|
|
data_b[index],
|
|
data_a[index]);
|
|
}
|
|
|
|
/**
|
|
* @brief Get an RGB texel value from the data.
|
|
*
|
|
* @param index The texel index.
|
|
*
|
|
* @return The texel in RGB0 component ordering.
|
|
*/
|
|
inline vfloat4 texel3(unsigned int index) const
|
|
{
|
|
return vfloat3(data_r[index],
|
|
data_g[index],
|
|
data_b[index]);
|
|
}
|
|
|
|
/**
|
|
* @brief Get the default alpha value for endpoints that don't store it.
|
|
*
|
|
* The default depends on whether the alpha endpoint is LDR or HDR.
|
|
*
|
|
* @return The alpha value in the scaled range used by the compressor.
|
|
*/
|
|
inline float get_default_alpha() const
|
|
{
|
|
return this->alpha_lns[0] ? static_cast<float>(0x7800) : static_cast<float>(0xFFFF);
|
|
}
|
|
|
|
/**
|
|
* @brief Test if a single color channel is constant across the block.
|
|
*
|
|
* Constant color channels are easier to compress as interpolating between two identical colors
|
|
* always returns the same value, irrespective of the weight used. They therefore can be ignored
|
|
* for the purposes of weight selection and use of a second weight plane.
|
|
*
|
|
* @return @c true if the channel is constant across the block, @c false otherwise.
|
|
*/
|
|
inline bool is_constant_channel(int channel) const
|
|
{
|
|
vmask4 lane_mask = vint4::lane_id() == vint4(channel);
|
|
vmask4 color_mask = this->data_min == this->data_max;
|
|
return any(lane_mask & color_mask);
|
|
}
|
|
|
|
/**
|
|
* @brief Test if this block is a luminance block with constant 1.0 alpha.
|
|
*
|
|
* @return @c true if the block is a luminance block , @c false otherwise.
|
|
*/
|
|
inline bool is_luminance() const
|
|
{
|
|
float default_alpha = this->get_default_alpha();
|
|
bool alpha1 = (this->data_min.lane<3>() == default_alpha) &&
|
|
(this->data_max.lane<3>() == default_alpha);
|
|
return this->grayscale && alpha1;
|
|
}
|
|
|
|
/**
|
|
* @brief Test if this block is a luminance block with variable alpha.
|
|
*
|
|
* @return @c true if the block is a luminance + alpha block , @c false otherwise.
|
|
*/
|
|
inline bool is_luminancealpha() const
|
|
{
|
|
float default_alpha = this->get_default_alpha();
|
|
bool alpha1 = (this->data_min.lane<3>() == default_alpha) &&
|
|
(this->data_max.lane<3>() == default_alpha);
|
|
return this->grayscale && !alpha1;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @brief Data structure storing the color endpoints for a block.
|
|
*/
|
|
struct endpoints
|
|
{
|
|
/** @brief The number of partition endpoints stored. */
|
|
unsigned int partition_count;
|
|
|
|
/** @brief The colors for endpoint 0. */
|
|
vfloat4 endpt0[BLOCK_MAX_PARTITIONS];
|
|
|
|
/** @brief The colors for endpoint 1. */
|
|
vfloat4 endpt1[BLOCK_MAX_PARTITIONS];
|
|
};
|
|
|
|
/**
|
|
* @brief Data structure storing the color endpoints and weights.
|
|
*/
|
|
struct endpoints_and_weights
|
|
{
|
|
/** @brief True if all active values in weight_error_scale are the same. */
|
|
bool is_constant_weight_error_scale;
|
|
|
|
/** @brief The color endpoints. */
|
|
endpoints ep;
|
|
|
|
/** @brief The ideal weight for each texel; may be undecimated or decimated. */
|
|
alignas(ASTCENC_VECALIGN) float weights[BLOCK_MAX_TEXELS];
|
|
|
|
/** @brief The ideal weight error scaling for each texel; may be undecimated or decimated. */
|
|
alignas(ASTCENC_VECALIGN) float weight_error_scale[BLOCK_MAX_TEXELS];
|
|
};
|
|
|
|
/**
|
|
* @brief Utility storing estimated errors from choosing particular endpoint encodings.
|
|
*/
|
|
struct encoding_choice_errors
|
|
{
|
|
/** @brief Error of using LDR RGB-scale instead of complete endpoints. */
|
|
float rgb_scale_error;
|
|
|
|
/** @brief Error of using HDR RGB-scale instead of complete endpoints. */
|
|
float rgb_luma_error;
|
|
|
|
/** @brief Error of using luminance instead of RGB. */
|
|
float luminance_error;
|
|
|
|
/** @brief Error of discarding alpha and using a constant 1.0 alpha. */
|
|
float alpha_drop_error;
|
|
|
|
/** @brief Can we use delta offset encoding? */
|
|
bool can_offset_encode;
|
|
|
|
/** @brief Can we use blue contraction encoding? */
|
|
bool can_blue_contract;
|
|
};
|
|
|
|
/**
|
|
* @brief Preallocated working buffers, allocated per thread during context creation.
|
|
*/
|
|
struct alignas(ASTCENC_VECALIGN) compression_working_buffers
|
|
{
|
|
/** @brief Ideal endpoints and weights for plane 1. */
|
|
endpoints_and_weights ei1;
|
|
|
|
/** @brief Ideal endpoints and weights for plane 2. */
|
|
endpoints_and_weights ei2;
|
|
|
|
/**
|
|
* @brief Decimated ideal weight values in the ~0-1 range.
|
|
*
|
|
* Note that values can be slightly below zero or higher than one due to
|
|
* endpoint extents being inside the ideal color representation.
|
|
*
|
|
* For two planes, second plane starts at @c WEIGHTS_PLANE2_OFFSET offsets.
|
|
*/
|
|
alignas(ASTCENC_VECALIGN) float dec_weights_ideal[WEIGHTS_MAX_DECIMATION_MODES * BLOCK_MAX_WEIGHTS];
|
|
|
|
/**
|
|
* @brief Decimated quantized weight values in the unquantized 0-64 range.
|
|
*
|
|
* For two planes, second plane starts at @c WEIGHTS_PLANE2_OFFSET offsets.
|
|
*/
|
|
uint8_t dec_weights_uquant[WEIGHTS_MAX_BLOCK_MODES * BLOCK_MAX_WEIGHTS];
|
|
|
|
/** @brief Error of the best encoding combination for each block mode. */
|
|
alignas(ASTCENC_VECALIGN) float errors_of_best_combination[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The best color quant for each block mode. */
|
|
uint8_t best_quant_levels[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The best color quant for each block mode if modes are the same and we have spare bits. */
|
|
uint8_t best_quant_levels_mod[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The best endpoint format for each partition. */
|
|
uint8_t best_ep_formats[WEIGHTS_MAX_BLOCK_MODES][BLOCK_MAX_PARTITIONS];
|
|
|
|
/** @brief The total bit storage needed for quantized weights for each block mode. */
|
|
int8_t qwt_bitcounts[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The cumulative error for quantized weights for each block mode. */
|
|
float qwt_errors[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The low weight value in plane 1 for each block mode. */
|
|
float weight_low_value1[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The high weight value in plane 1 for each block mode. */
|
|
float weight_high_value1[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The low weight value in plane 1 for each quant level and decimation mode. */
|
|
float weight_low_values1[WEIGHTS_MAX_DECIMATION_MODES][TUNE_MAX_ANGULAR_QUANT + 1];
|
|
|
|
/** @brief The high weight value in plane 1 for each quant level and decimation mode. */
|
|
float weight_high_values1[WEIGHTS_MAX_DECIMATION_MODES][TUNE_MAX_ANGULAR_QUANT + 1];
|
|
|
|
/** @brief The low weight value in plane 2 for each block mode. */
|
|
float weight_low_value2[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The high weight value in plane 2 for each block mode. */
|
|
float weight_high_value2[WEIGHTS_MAX_BLOCK_MODES];
|
|
|
|
/** @brief The low weight value in plane 2 for each quant level and decimation mode. */
|
|
float weight_low_values2[WEIGHTS_MAX_DECIMATION_MODES][TUNE_MAX_ANGULAR_QUANT + 1];
|
|
|
|
/** @brief The high weight value in plane 2 for each quant level and decimation mode. */
|
|
float weight_high_values2[WEIGHTS_MAX_DECIMATION_MODES][TUNE_MAX_ANGULAR_QUANT + 1];
|
|
};
|
|
|
|
struct dt_init_working_buffers
|
|
{
|
|
uint8_t weight_count_of_texel[BLOCK_MAX_TEXELS];
|
|
uint8_t grid_weights_of_texel[BLOCK_MAX_TEXELS][4];
|
|
uint8_t weights_of_texel[BLOCK_MAX_TEXELS][4];
|
|
|
|
uint8_t texel_count_of_weight[BLOCK_MAX_WEIGHTS];
|
|
uint8_t texels_of_weight[BLOCK_MAX_WEIGHTS][BLOCK_MAX_TEXELS];
|
|
uint8_t texel_weights_of_weight[BLOCK_MAX_WEIGHTS][BLOCK_MAX_TEXELS];
|
|
};
|
|
|
|
/**
|
|
* @brief Weight quantization transfer table.
|
|
*
|
|
* ASTC can store texel weights at many quantization levels, so for performance we store essential
|
|
* information about each level as a precomputed data structure. Unquantized weights are integers
|
|
* or floats in the range [0, 64].
|
|
*
|
|
* This structure provides a table, used to estimate the closest quantized weight for a given
|
|
* floating-point weight. For each quantized weight, the corresponding unquantized values. For each
|
|
* quantized weight, a previous-value and a next-value.
|
|
*/
|
|
struct quant_and_transfer_table
|
|
{
|
|
/** @brief The unscrambled unquantized value. */
|
|
int8_t quant_to_unquant[32];
|
|
|
|
/** @brief The scrambling order: scrambled_quant = map[unscrambled_quant]. */
|
|
int8_t scramble_map[32];
|
|
|
|
/** @brief The unscrambling order: unscrambled_unquant = map[scrambled_quant]. */
|
|
int8_t unscramble_and_unquant_map[32];
|
|
|
|
/**
|
|
* @brief A table of previous-and-next weights, indexed by the current unquantized value.
|
|
* * bits 7:0 = previous-index, unquantized
|
|
* * bits 15:8 = next-index, unquantized
|
|
*/
|
|
uint16_t prev_next_values[65];
|
|
};
|
|
|
|
/** @brief The precomputed quant and transfer table. */
|
|
extern const quant_and_transfer_table quant_and_xfer_tables[12];
|
|
|
|
/** @brief The block is an error block, and will return error color or NaN. */
|
|
static constexpr uint8_t SYM_BTYPE_ERROR { 0 };
|
|
|
|
/** @brief The block is a constant color block using FP16 colors. */
|
|
static constexpr uint8_t SYM_BTYPE_CONST_F16 { 1 };
|
|
|
|
/** @brief The block is a constant color block using UNORM16 colors. */
|
|
static constexpr uint8_t SYM_BTYPE_CONST_U16 { 2 };
|
|
|
|
/** @brief The block is a normal non-constant color block. */
|
|
static constexpr uint8_t SYM_BTYPE_NONCONST { 3 };
|
|
|
|
/**
|
|
* @brief A symbolic representation of a compressed block.
|
|
*
|
|
* The symbolic representation stores the unpacked content of a single
|
|
* @c physical_compressed_block, in a form which is much easier to access for
|
|
* the rest of the compressor code.
|
|
*/
|
|
struct symbolic_compressed_block
|
|
{
|
|
/** @brief The block type, one of the @c SYM_BTYPE_* constants. */
|
|
uint8_t block_type;
|
|
|
|
/** @brief The number of partitions; valid for @c NONCONST blocks. */
|
|
uint8_t partition_count;
|
|
|
|
/** @brief Non-zero if the color formats matched; valid for @c NONCONST blocks. */
|
|
uint8_t color_formats_matched;
|
|
|
|
/** @brief The plane 2 color component, or -1 if single plane; valid for @c NONCONST blocks. */
|
|
int8_t plane2_component;
|
|
|
|
/** @brief The block mode; valid for @c NONCONST blocks. */
|
|
uint16_t block_mode;
|
|
|
|
/** @brief The partition index; valid for @c NONCONST blocks if 2 or more partitions. */
|
|
uint16_t partition_index;
|
|
|
|
/** @brief The endpoint color formats for each partition; valid for @c NONCONST blocks. */
|
|
uint8_t color_formats[BLOCK_MAX_PARTITIONS];
|
|
|
|
/** @brief The endpoint color quant mode; valid for @c NONCONST blocks. */
|
|
quant_method quant_mode;
|
|
|
|
/** @brief The error of the current encoding; valid for @c NONCONST blocks. */
|
|
float errorval;
|
|
|
|
// We can't have both of these at the same time
|
|
union {
|
|
/** @brief The constant color; valid for @c CONST blocks. */
|
|
int constant_color[BLOCK_MAX_COMPONENTS];
|
|
|
|
/** @brief The quantized endpoint color pairs; valid for @c NONCONST blocks. */
|
|
uint8_t color_values[BLOCK_MAX_PARTITIONS][8];
|
|
};
|
|
|
|
/** @brief The quantized and decimated weights.
|
|
*
|
|
* Weights are stored in the 0-64 unpacked range allowing them to be used
|
|
* directly in encoding passes without per-use unpacking. Packing happens
|
|
* when converting to/from the physical bitstream encoding.
|
|
*
|
|
* If dual plane, the second plane starts at @c weights[WEIGHTS_PLANE2_OFFSET].
|
|
*/
|
|
uint8_t weights[BLOCK_MAX_WEIGHTS];
|
|
|
|
/**
|
|
* @brief Get the weight quantization used by this block mode.
|
|
*
|
|
* @return The quantization level.
|
|
*/
|
|
inline quant_method get_color_quant_mode() const
|
|
{
|
|
return this->quant_mode;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* @brief A physical representation of a compressed block.
|
|
*
|
|
* The physical representation stores the raw bytes of the format in memory.
|
|
*/
|
|
struct physical_compressed_block
|
|
{
|
|
/** @brief The ASTC encoded data for a single block. */
|
|
uint8_t data[16];
|
|
};
|
|
|
|
|
|
/**
|
|
* @brief Parameter structure for @c compute_pixel_region_variance().
|
|
*
|
|
* This function takes a structure to avoid spilling arguments to the stack on every function
|
|
* invocation, as there are a lot of parameters.
|
|
*/
|
|
struct pixel_region_args
|
|
{
|
|
/** @brief The image to analyze. */
|
|
const astcenc_image* img;
|
|
|
|
/** @brief The component swizzle pattern. */
|
|
astcenc_swizzle swz;
|
|
|
|
/** @brief Should the algorithm bother with Z axis processing? */
|
|
bool have_z;
|
|
|
|
/** @brief The kernel radius for alpha processing. */
|
|
unsigned int alpha_kernel_radius;
|
|
|
|
/** @brief The X dimension of the working data to process. */
|
|
unsigned int size_x;
|
|
|
|
/** @brief The Y dimension of the working data to process. */
|
|
unsigned int size_y;
|
|
|
|
/** @brief The Z dimension of the working data to process. */
|
|
unsigned int size_z;
|
|
|
|
/** @brief The X position of first src and dst data in the data set. */
|
|
unsigned int offset_x;
|
|
|
|
/** @brief The Y position of first src and dst data in the data set. */
|
|
unsigned int offset_y;
|
|
|
|
/** @brief The Z position of first src and dst data in the data set. */
|
|
unsigned int offset_z;
|
|
|
|
/** @brief The working memory buffer. */
|
|
vfloat4 *work_memory;
|
|
};
|
|
|
|
/**
|
|
* @brief Parameter structure for @c compute_averages_proc().
|
|
*/
|
|
struct avg_args
|
|
{
|
|
/** @brief The arguments for the nested variance computation. */
|
|
pixel_region_args arg;
|
|
|
|
/** @brief The image X dimensions. */
|
|
unsigned int img_size_x;
|
|
|
|
/** @brief The image Y dimensions. */
|
|
unsigned int img_size_y;
|
|
|
|
/** @brief The image Z dimensions. */
|
|
unsigned int img_size_z;
|
|
|
|
/** @brief The maximum working block dimensions in X and Y dimensions. */
|
|
unsigned int blk_size_xy;
|
|
|
|
/** @brief The maximum working block dimensions in Z dimensions. */
|
|
unsigned int blk_size_z;
|
|
|
|
/** @brief The working block memory size. */
|
|
unsigned int work_memory_size;
|
|
};
|
|
|
|
#if defined(ASTCENC_DIAGNOSTICS)
|
|
/* See astcenc_diagnostic_trace header for details. */
|
|
class TraceLog;
|
|
#endif
|
|
|
|
/**
|
|
* @brief The astcenc compression context.
|
|
*/
|
|
struct astcenc_contexti
|
|
{
|
|
/** @brief The configuration this context was created with. */
|
|
astcenc_config config;
|
|
|
|
/** @brief The thread count supported by this context. */
|
|
unsigned int thread_count;
|
|
|
|
/** @brief The block size descriptor this context was created with. */
|
|
block_size_descriptor* bsd;
|
|
|
|
/*
|
|
* Fields below here are not needed in a decompress-only build, but some remain as they are
|
|
* small and it avoids littering the code with #ifdefs. The most significant contributors to
|
|
* large structure size are omitted.
|
|
*/
|
|
|
|
/** @brief The input image alpha channel averages table, may be @c nullptr if not needed. */
|
|
float* input_alpha_averages;
|
|
|
|
/** @brief The scratch working buffers, one per thread (see @c thread_count). */
|
|
compression_working_buffers* working_buffers;
|
|
|
|
#if !defined(ASTCENC_DECOMPRESS_ONLY)
|
|
/** @brief The pixel region and variance worker arguments. */
|
|
avg_args avg_preprocess_args;
|
|
#endif
|
|
|
|
#if defined(ASTCENC_DIAGNOSTICS)
|
|
/**
|
|
* @brief The diagnostic trace logger.
|
|
*
|
|
* Note that this is a singleton, so can only be used in single threaded mode. It only exists
|
|
* here so we have a reference to close the file at the end of the capture.
|
|
*/
|
|
TraceLog* trace_log;
|
|
#endif
|
|
};
|
|
|
|
/* ============================================================================
|
|
Functionality for managing block sizes and partition tables.
|
|
============================================================================ */
|
|
|
|
/**
|
|
* @brief Populate the block size descriptor for the target block size.
|
|
*
|
|
* This will also initialize the partition table metadata, which is stored as part of the BSD
|
|
* structure.
|
|
*
|
|
* @param x_texels The number of texels in the block X dimension.
|
|
* @param y_texels The number of texels in the block Y dimension.
|
|
* @param z_texels The number of texels in the block Z dimension.
|
|
* @param can_omit_modes Can we discard modes and partitionings that astcenc won't use?
|
|
* @param partition_count_cutoff The partition count cutoff to use, if we can omit partitionings.
|
|
* @param mode_cutoff The block mode percentile cutoff [0-1].
|
|
* @param[out] bsd The descriptor to initialize.
|
|
*/
|
|
void init_block_size_descriptor(
|
|
unsigned int x_texels,
|
|
unsigned int y_texels,
|
|
unsigned int z_texels,
|
|
bool can_omit_modes,
|
|
unsigned int partition_count_cutoff,
|
|
float mode_cutoff,
|
|
block_size_descriptor& bsd);
|
|
|
|
/**
|
|
* @brief Populate the partition tables for the target block size.
|
|
*
|
|
* Note the @c bsd descriptor must be initialized by calling @c init_block_size_descriptor() before
|
|
* calling this function.
|
|
*
|
|
* @param[out] bsd The block size information structure to populate.
|
|
* @param can_omit_partitionings True if we can we drop partitionings that astcenc won't use.
|
|
* @param partition_count_cutoff The partition count cutoff to use, if we can omit partitionings.
|
|
*/
|
|
void init_partition_tables(
|
|
block_size_descriptor& bsd,
|
|
bool can_omit_partitionings,
|
|
unsigned int partition_count_cutoff);
|
|
|
|
/**
|
|
* @brief Get the percentile table for 2D block modes.
|
|
*
|
|
* This is an empirically determined prioritization of which block modes to use in the search in
|
|
* terms of their centile (lower centiles = more useful).
|
|
*
|
|
* Returns a dynamically allocated array; caller must free with delete[].
|
|
*
|
|
* @param xdim The block x size.
|
|
* @param ydim The block y size.
|
|
*
|
|
* @return The unpacked table.
|
|
*/
|
|
const float* get_2d_percentile_table(
|
|
unsigned int xdim,
|
|
unsigned int ydim);
|
|
|
|
/**
|
|
* @brief Query if a 2D block size is legal.
|
|
*
|
|
* @return True if legal, false otherwise.
|
|
*/
|
|
bool is_legal_2d_block_size(
|
|
unsigned int xdim,
|
|
unsigned int ydim);
|
|
|
|
/**
|
|
* @brief Query if a 3D block size is legal.
|
|
*
|
|
* @return True if legal, false otherwise.
|
|
*/
|
|
bool is_legal_3d_block_size(
|
|
unsigned int xdim,
|
|
unsigned int ydim,
|
|
unsigned int zdim);
|
|
|
|
/* ============================================================================
|
|
Functionality for managing BISE quantization and unquantization.
|
|
============================================================================ */
|
|
|
|
/**
|
|
* @brief The precomputed table for quantizing color values.
|
|
*
|
|
* Converts unquant value in 0-255 range into quant value in 0-255 range.
|
|
* No BISE scrambling is applied at this stage.
|
|
*
|
|
* The BISE encoding results in ties where available quant<256> values are
|
|
* equidistant the available quant<BISE> values. This table stores two values
|
|
* for each input - one for use with a negative residual, and one for use with
|
|
* a positive residual.
|
|
*
|
|
* Indexed by [quant_mode - 4][data_value * 2 + residual].
|
|
*/
|
|
extern const uint8_t color_unquant_to_uquant_tables[17][512];
|
|
|
|
/**
|
|
* @brief The precomputed table for packing quantized color values.
|
|
*
|
|
* Converts quant value in 0-255 range into packed quant value in 0-N range,
|
|
* with BISE scrambling applied.
|
|
*
|
|
* Indexed by [quant_mode - 4][data_value].
|
|
*/
|
|
extern const uint8_t color_uquant_to_scrambled_pquant_tables[17][256];
|
|
|
|
/**
|
|
* @brief The precomputed table for unpacking color values.
|
|
*
|
|
* Converts quant value in 0-N range into unpacked value in 0-255 range,
|
|
* with BISE unscrambling applied.
|
|
*
|
|
* Indexed by [quant_mode - 4][data_value].
|
|
*/
|
|
extern const uint8_t* color_scrambled_pquant_to_uquant_tables[17];
|
|
|
|
/**
|
|
* @brief The precomputed quant mode storage table.
|
|
*
|
|
* Indexing by [integer_count/2][bits] gives us the quantization level for a given integer count and
|
|
* number of compressed storage bits. Returns -1 for cases where the requested integer count cannot
|
|
* ever fit in the supplied storage size.
|
|
*/
|
|
extern const int8_t quant_mode_table[10][128];
|
|
|
|
/**
|
|
* @brief Encode a packed string using BISE.
|
|
*
|
|
* Note that BISE can return strings that are not a whole number of bytes in length, and ASTC can
|
|
* start storing strings in a block at arbitrary bit offsets in the encoded data.
|
|
*
|
|
* @param quant_level The BISE alphabet size.
|
|
* @param character_count The number of characters in the string.
|
|
* @param input_data The unpacked string, one byte per character.
|
|
* @param[in,out] output_data The output packed string.
|
|
* @param bit_offset The starting offset in the output storage.
|
|
*/
|
|
void encode_ise(
|
|
quant_method quant_level,
|
|
unsigned int character_count,
|
|
const uint8_t* input_data,
|
|
uint8_t* output_data,
|
|
unsigned int bit_offset);
|
|
|
|
/**
|
|
* @brief Decode a packed string using BISE.
|
|
*
|
|
* Note that BISE input strings are not a whole number of bytes in length, and ASTC can start
|
|
* strings at arbitrary bit offsets in the encoded data.
|
|
*
|
|
* @param quant_level The BISE alphabet size.
|
|
* @param character_count The number of characters in the string.
|
|
* @param input_data The packed string.
|
|
* @param[in,out] output_data The output storage, one byte per character.
|
|
* @param bit_offset The starting offset in the output storage.
|
|
*/
|
|
void decode_ise(
|
|
quant_method quant_level,
|
|
unsigned int character_count,
|
|
const uint8_t* input_data,
|
|
uint8_t* output_data,
|
|
unsigned int bit_offset);
|
|
|
|
/**
|
|
* @brief Return the number of bits needed to encode an ISE sequence.
|
|
*
|
|
* This implementation assumes that the @c quant level is untrusted, given it may come from random
|
|
* data being decompressed, so we return an arbitrary unencodable size if that is the case.
|
|
*
|
|
* @param character_count The number of items in the sequence.
|
|
* @param quant_level The desired quantization level.
|
|
*
|
|
* @return The number of bits needed to encode the BISE string.
|
|
*/
|
|
unsigned int get_ise_sequence_bitcount(
|
|
unsigned int character_count,
|
|
quant_method quant_level);
|
|
|
|
/* ============================================================================
|
|
Functionality for managing color partitioning.
|
|
============================================================================ */
|
|
|
|
/**
|
|
* @brief Compute averages and dominant directions for each partition in a 2 component texture.
|
|
*
|
|
* @param pi The partition info for the current trial.
|
|
* @param blk The image block color data to be compressed.
|
|
* @param component1 The first component included in the analysis.
|
|
* @param component2 The second component included in the analysis.
|
|
* @param[out] pm The output partition metrics.
|
|
* - Only pi.partition_count array entries actually get initialized.
|
|
* - Direction vectors @c pm.dir are not normalized.
|
|
*/
|
|
void compute_avgs_and_dirs_2_comp(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
unsigned int component1,
|
|
unsigned int component2,
|
|
partition_metrics pm[BLOCK_MAX_PARTITIONS]);
|
|
|
|
/**
|
|
* @brief Compute averages and dominant directions for each partition in a 3 component texture.
|
|
*
|
|
* @param pi The partition info for the current trial.
|
|
* @param blk The image block color data to be compressed.
|
|
* @param omitted_component The component excluded from the analysis.
|
|
* @param[out] pm The output partition metrics.
|
|
* - Only pi.partition_count array entries actually get initialized.
|
|
* - Direction vectors @c pm.dir are not normalized.
|
|
*/
|
|
void compute_avgs_and_dirs_3_comp(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
unsigned int omitted_component,
|
|
partition_metrics pm[BLOCK_MAX_PARTITIONS]);
|
|
|
|
/**
|
|
* @brief Compute averages and dominant directions for each partition in a 3 component texture.
|
|
*
|
|
* This is a specialization of @c compute_avgs_and_dirs_3_comp where the omitted component is
|
|
* always alpha, a common case during partition search.
|
|
*
|
|
* @param pi The partition info for the current trial.
|
|
* @param blk The image block color data to be compressed.
|
|
* @param[out] pm The output partition metrics.
|
|
* - Only pi.partition_count array entries actually get initialized.
|
|
* - Direction vectors @c pm.dir are not normalized.
|
|
*/
|
|
void compute_avgs_and_dirs_3_comp_rgb(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
partition_metrics pm[BLOCK_MAX_PARTITIONS]);
|
|
|
|
/**
|
|
* @brief Compute averages and dominant directions for each partition in a 4 component texture.
|
|
*
|
|
* @param pi The partition info for the current trial.
|
|
* @param blk The image block color data to be compressed.
|
|
* @param[out] pm The output partition metrics.
|
|
* - Only pi.partition_count array entries actually get initialized.
|
|
* - Direction vectors @c pm.dir are not normalized.
|
|
*/
|
|
void compute_avgs_and_dirs_4_comp(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
partition_metrics pm[BLOCK_MAX_PARTITIONS]);
|
|
|
|
/**
|
|
* @brief Compute the RGB error for uncorrelated and same chroma projections.
|
|
*
|
|
* The output of compute averages and dirs is post processed to define two lines, both of which go
|
|
* through the mean-color-value. One line has a direction defined by the dominant direction; this
|
|
* is used to assess the error from using an uncorrelated color representation. The other line goes
|
|
* through (0,0,0) and is used to assess the error from using an RGBS color representation.
|
|
*
|
|
* This function computes the squared error when using these two representations.
|
|
*
|
|
* @param pi The partition info for the current trial.
|
|
* @param blk The image block color data to be compressed.
|
|
* @param[in,out] plines Processed line inputs, and line length outputs.
|
|
* @param[out] uncor_error The cumulative error for using the uncorrelated line.
|
|
* @param[out] samec_error The cumulative error for using the same chroma line.
|
|
*/
|
|
void compute_error_squared_rgb(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
partition_lines3 plines[BLOCK_MAX_PARTITIONS],
|
|
float& uncor_error,
|
|
float& samec_error);
|
|
|
|
/**
|
|
* @brief Compute the RGBA error for uncorrelated and same chroma projections.
|
|
*
|
|
* The output of compute averages and dirs is post processed to define two lines, both of which go
|
|
* through the mean-color-value. One line has a direction defined by the dominant direction; this
|
|
* is used to assess the error from using an uncorrelated color representation. The other line goes
|
|
* through (0,0,0,1) and is used to assess the error from using an RGBS color representation.
|
|
*
|
|
* This function computes the squared error when using these two representations.
|
|
*
|
|
* @param pi The partition info for the current trial.
|
|
* @param blk The image block color data to be compressed.
|
|
* @param uncor_plines Processed uncorrelated partition lines for each partition.
|
|
* @param samec_plines Processed same chroma partition lines for each partition.
|
|
* @param[out] line_lengths The length of each components deviation from the line.
|
|
* @param[out] uncor_error The cumulative error for using the uncorrelated line.
|
|
* @param[out] samec_error The cumulative error for using the same chroma line.
|
|
*/
|
|
void compute_error_squared_rgba(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
const processed_line4 uncor_plines[BLOCK_MAX_PARTITIONS],
|
|
const processed_line4 samec_plines[BLOCK_MAX_PARTITIONS],
|
|
float line_lengths[BLOCK_MAX_PARTITIONS],
|
|
float& uncor_error,
|
|
float& samec_error);
|
|
|
|
/**
|
|
* @brief Find the best set of partitions to trial for a given block.
|
|
*
|
|
* On return the @c best_partitions list will contain the two best partition
|
|
* candidates; one assuming data has uncorrelated chroma and one assuming the
|
|
* data has correlated chroma. The best candidate is returned first in the list.
|
|
*
|
|
* @param bsd The block size information.
|
|
* @param blk The image block color data to compress.
|
|
* @param partition_count The number of partitions in the block.
|
|
* @param partition_search_limit The number of candidate partition encodings to trial.
|
|
* @param[out] best_partitions The best partition candidates.
|
|
* @param requested_candidates The number of requested partitionings. May return fewer if
|
|
* candidates are not available.
|
|
*
|
|
* @return The actual number of candidates returned.
|
|
*/
|
|
unsigned int find_best_partition_candidates(
|
|
const block_size_descriptor& bsd,
|
|
const image_block& blk,
|
|
unsigned int partition_count,
|
|
unsigned int partition_search_limit,
|
|
unsigned int best_partitions[TUNE_MAX_PARTITIONING_CANDIDATES],
|
|
unsigned int requested_candidates);
|
|
|
|
/* ============================================================================
|
|
Functionality for managing images and image related data.
|
|
============================================================================ */
|
|
|
|
/**
|
|
* @brief Setup computation of regional averages in an image.
|
|
*
|
|
* This must be done by only a single thread per image, before any thread calls
|
|
* @c compute_averages().
|
|
*
|
|
* Results are written back into @c img->input_alpha_averages.
|
|
*
|
|
* @param img The input image data, also holds output data.
|
|
* @param alpha_kernel_radius The kernel radius (in pixels) for alpha mods.
|
|
* @param swz Input data component swizzle.
|
|
* @param[out] ag The average variance arguments to init.
|
|
*
|
|
* @return The number of tasks in the processing stage.
|
|
*/
|
|
unsigned int init_compute_averages(
|
|
const astcenc_image& img,
|
|
unsigned int alpha_kernel_radius,
|
|
const astcenc_swizzle& swz,
|
|
avg_args& ag);
|
|
|
|
/**
|
|
* @brief Compute averages for a pixel region.
|
|
*
|
|
* The routine computes both in a single pass, using a summed-area table to decouple the running
|
|
* time from the averaging/variance kernel size.
|
|
*
|
|
* @param[out] ctx The compressor context storing the output data.
|
|
* @param arg The input parameter structure.
|
|
*/
|
|
void compute_pixel_region_variance(
|
|
astcenc_contexti& ctx,
|
|
const pixel_region_args& arg);
|
|
/**
|
|
* @brief Load a single image block from the input image.
|
|
*
|
|
* @param decode_mode The compression color profile.
|
|
* @param img The input image data.
|
|
* @param[out] blk The image block to populate.
|
|
* @param bsd The block size information.
|
|
* @param xpos The block X coordinate in the input image.
|
|
* @param ypos The block Y coordinate in the input image.
|
|
* @param zpos The block Z coordinate in the input image.
|
|
* @param swz The swizzle to apply on load.
|
|
*/
|
|
void load_image_block(
|
|
astcenc_profile decode_mode,
|
|
const astcenc_image& img,
|
|
image_block& blk,
|
|
const block_size_descriptor& bsd,
|
|
unsigned int xpos,
|
|
unsigned int ypos,
|
|
unsigned int zpos,
|
|
const astcenc_swizzle& swz);
|
|
|
|
/**
|
|
* @brief Load a single image block from the input image.
|
|
*
|
|
* This specialized variant can be used only if the block is 2D LDR U8 data,
|
|
* with no swizzle.
|
|
*
|
|
* @param decode_mode The compression color profile.
|
|
* @param img The input image data.
|
|
* @param[out] blk The image block to populate.
|
|
* @param bsd The block size information.
|
|
* @param xpos The block X coordinate in the input image.
|
|
* @param ypos The block Y coordinate in the input image.
|
|
* @param zpos The block Z coordinate in the input image.
|
|
* @param swz The swizzle to apply on load.
|
|
*/
|
|
void load_image_block_fast_ldr(
|
|
astcenc_profile decode_mode,
|
|
const astcenc_image& img,
|
|
image_block& blk,
|
|
const block_size_descriptor& bsd,
|
|
unsigned int xpos,
|
|
unsigned int ypos,
|
|
unsigned int zpos,
|
|
const astcenc_swizzle& swz);
|
|
|
|
/**
|
|
* @brief Store a single image block to the output image.
|
|
*
|
|
* @param[out] img The output image data.
|
|
* @param blk The image block to export.
|
|
* @param bsd The block size information.
|
|
* @param xpos The block X coordinate in the input image.
|
|
* @param ypos The block Y coordinate in the input image.
|
|
* @param zpos The block Z coordinate in the input image.
|
|
* @param swz The swizzle to apply on store.
|
|
*/
|
|
void store_image_block(
|
|
astcenc_image& img,
|
|
const image_block& blk,
|
|
const block_size_descriptor& bsd,
|
|
unsigned int xpos,
|
|
unsigned int ypos,
|
|
unsigned int zpos,
|
|
const astcenc_swizzle& swz);
|
|
|
|
/* ============================================================================
|
|
Functionality for computing endpoint colors and weights for a block.
|
|
============================================================================ */
|
|
|
|
/**
|
|
* @brief Compute ideal endpoint colors and weights for 1 plane of weights.
|
|
*
|
|
* The ideal endpoints define a color line for the partition. For each texel the ideal weight
|
|
* defines an exact position on the partition color line. We can then use these to assess the error
|
|
* introduced by removing and quantizing the weight grid.
|
|
*
|
|
* @param blk The image block color data to compress.
|
|
* @param pi The partition info for the current trial.
|
|
* @param[out] ei The endpoint and weight values.
|
|
*/
|
|
void compute_ideal_colors_and_weights_1plane(
|
|
const image_block& blk,
|
|
const partition_info& pi,
|
|
endpoints_and_weights& ei);
|
|
|
|
/**
|
|
* @brief Compute ideal endpoint colors and weights for 2 planes of weights.
|
|
*
|
|
* The ideal endpoints define a color line for the partition. For each texel the ideal weight
|
|
* defines an exact position on the partition color line. We can then use these to assess the error
|
|
* introduced by removing and quantizing the weight grid.
|
|
*
|
|
* @param bsd The block size information.
|
|
* @param blk The image block color data to compress.
|
|
* @param plane2_component The component assigned to plane 2.
|
|
* @param[out] ei1 The endpoint and weight values for plane 1.
|
|
* @param[out] ei2 The endpoint and weight values for plane 2.
|
|
*/
|
|
void compute_ideal_colors_and_weights_2planes(
|
|
const block_size_descriptor& bsd,
|
|
const image_block& blk,
|
|
unsigned int plane2_component,
|
|
endpoints_and_weights& ei1,
|
|
endpoints_and_weights& ei2);
|
|
|
|
/**
|
|
* @brief Compute the optimal unquantized weights for a decimation table.
|
|
*
|
|
* After computing ideal weights for the case for a complete weight grid, we we want to compute the
|
|
* ideal weights for the case where weights exist only for some texels. We do this with a
|
|
* steepest-descent grid solver which works as follows:
|
|
*
|
|
* First, for each actual weight, perform a weighted averaging of the texels affected by the weight.
|
|
* Then, set step size to <some initial value> and attempt one step towards the original ideal
|
|
* weight if it helps to reduce error.
|
|
*
|
|
* @param ei The non-decimated endpoints and weights.
|
|
* @param di The selected weight decimation.
|
|
* @param[out] dec_weight_ideal_value The ideal values for the decimated weight set.
|
|
*/
|
|
void compute_ideal_weights_for_decimation(
|
|
const endpoints_and_weights& ei,
|
|
const decimation_info& di,
|
|
float* dec_weight_ideal_value);
|
|
|
|
/**
|
|
* @brief Compute the optimal quantized weights for a decimation table.
|
|
*
|
|
* We test the two closest weight indices in the allowed quantization range and keep the weight that
|
|
* is the closest match.
|
|
*
|
|
* @param di The selected weight decimation.
|
|
* @param low_bound The lowest weight allowed.
|
|
* @param high_bound The highest weight allowed.
|
|
* @param dec_weight_ideal_value The ideal weight set.
|
|
* @param[out] dec_weight_quant_uvalue The output quantized weight as a float.
|
|
* @param[out] dec_weight_uquant The output quantized weight as encoded int.
|
|
* @param quant_level The desired weight quant level.
|
|
*/
|
|
void compute_quantized_weights_for_decimation(
|
|
const decimation_info& di,
|
|
float low_bound,
|
|
float high_bound,
|
|
const float* dec_weight_ideal_value,
|
|
float* dec_weight_quant_uvalue,
|
|
uint8_t* dec_weight_uquant,
|
|
quant_method quant_level);
|
|
|
|
/**
|
|
* @brief Compute the error of a decimated weight set for 1 plane.
|
|
*
|
|
* After computing ideal weights for the case with one weight per texel, we want to compute the
|
|
* error for decimated weight grids where weights are stored at a lower resolution. This function
|
|
* computes the error of the reduced grid, compared to the full grid.
|
|
*
|
|
* @param eai The ideal weights for the full grid.
|
|
* @param di The selected weight decimation.
|
|
* @param dec_weight_quant_uvalue The quantized weights for the decimated grid.
|
|
*
|
|
* @return The accumulated error.
|
|
*/
|
|
float compute_error_of_weight_set_1plane(
|
|
const endpoints_and_weights& eai,
|
|
const decimation_info& di,
|
|
const float* dec_weight_quant_uvalue);
|
|
|
|
/**
|
|
* @brief Compute the error of a decimated weight set for 2 planes.
|
|
*
|
|
* After computing ideal weights for the case with one weight per texel, we want to compute the
|
|
* error for decimated weight grids where weights are stored at a lower resolution. This function
|
|
* computes the error of the reduced grid, compared to the full grid.
|
|
*
|
|
* @param eai1 The ideal weights for the full grid and plane 1.
|
|
* @param eai2 The ideal weights for the full grid and plane 2.
|
|
* @param di The selected weight decimation.
|
|
* @param dec_weight_quant_uvalue_plane1 The quantized weights for the decimated grid plane 1.
|
|
* @param dec_weight_quant_uvalue_plane2 The quantized weights for the decimated grid plane 2.
|
|
*
|
|
* @return The accumulated error.
|
|
*/
|
|
float compute_error_of_weight_set_2planes(
|
|
const endpoints_and_weights& eai1,
|
|
const endpoints_and_weights& eai2,
|
|
const decimation_info& di,
|
|
const float* dec_weight_quant_uvalue_plane1,
|
|
const float* dec_weight_quant_uvalue_plane2);
|
|
|
|
/**
|
|
* @brief Pack a single pair of color endpoints as effectively as possible.
|
|
*
|
|
* The user requests a base color endpoint mode in @c format, but the quantizer may choose a
|
|
* delta-based representation. It will report back the format variant it actually used.
|
|
*
|
|
* @param color0 The input unquantized color0 endpoint for absolute endpoint pairs.
|
|
* @param color1 The input unquantized color1 endpoint for absolute endpoint pairs.
|
|
* @param rgbs_color The input unquantized RGBS variant endpoint for same chroma endpoints.
|
|
* @param rgbo_color The input unquantized RGBS variant endpoint for HDR endpoints.
|
|
* @param format The desired base format.
|
|
* @param[out] output The output storage for the quantized colors/
|
|
* @param quant_level The quantization level requested.
|
|
*
|
|
* @return The actual endpoint mode used.
|
|
*/
|
|
uint8_t pack_color_endpoints(
|
|
vfloat4 color0,
|
|
vfloat4 color1,
|
|
vfloat4 rgbs_color,
|
|
vfloat4 rgbo_color,
|
|
int format,
|
|
uint8_t* output,
|
|
quant_method quant_level);
|
|
|
|
/**
|
|
* @brief Unpack a single pair of encoded endpoints.
|
|
*
|
|
* Endpoints must be unscrambled and converted into the 0-255 range before calling this functions.
|
|
*
|
|
* @param decode_mode The decode mode (LDR, HDR).
|
|
* @param format The color endpoint mode used.
|
|
* @param input The raw array of encoded input integers. The length of this array
|
|
* depends on @c format; it can be safely assumed to be large enough.
|
|
* @param[out] rgb_hdr Is the endpoint using HDR for the RGB channels?
|
|
* @param[out] alpha_hdr Is the endpoint using HDR for the A channel?
|
|
* @param[out] output0 The output color for endpoint 0.
|
|
* @param[out] output1 The output color for endpoint 1.
|
|
*/
|
|
void unpack_color_endpoints(
|
|
astcenc_profile decode_mode,
|
|
int format,
|
|
const uint8_t* input,
|
|
bool& rgb_hdr,
|
|
bool& alpha_hdr,
|
|
vint4& output0,
|
|
vint4& output1);
|
|
|
|
/**
|
|
* @brief Unpack a set of quantized and decimated weights.
|
|
*
|
|
* TODO: Can we skip this for non-decimated weights now that the @c scb is
|
|
* already storing unquantized weights?
|
|
*
|
|
* @param bsd The block size information.
|
|
* @param scb The symbolic compressed encoding.
|
|
* @param di The weight grid decimation table.
|
|
* @param is_dual_plane @c true if this is a dual plane block, @c false otherwise.
|
|
* @param[out] weights_plane1 The output array for storing the plane 1 weights.
|
|
* @param[out] weights_plane2 The output array for storing the plane 2 weights.
|
|
*/
|
|
void unpack_weights(
|
|
const block_size_descriptor& bsd,
|
|
const symbolic_compressed_block& scb,
|
|
const decimation_info& di,
|
|
bool is_dual_plane,
|
|
int weights_plane1[BLOCK_MAX_TEXELS],
|
|
int weights_plane2[BLOCK_MAX_TEXELS]);
|
|
|
|
/**
|
|
* @brief Identify, for each mode, which set of color endpoint produces the best result.
|
|
*
|
|
* Returns the best @c tune_candidate_limit best looking modes, along with the ideal color encoding
|
|
* combination for each. The modified quantization level can be used when all formats are the same,
|
|
* as this frees up two additional bits of storage.
|
|
*
|
|
* @param pi The partition info for the current trial.
|
|
* @param blk The image block color data to compress.
|
|
* @param ep The ideal endpoints.
|
|
* @param qwt_bitcounts Bit counts for different quantization methods.
|
|
* @param qwt_errors Errors for different quantization methods.
|
|
* @param tune_candidate_limit The max number of candidates to return, may be less.
|
|
* @param start_block_mode The first block mode to inspect.
|
|
* @param end_block_mode The last block mode to inspect.
|
|
* @param[out] partition_format_specifiers The best formats per partition.
|
|
* @param[out] block_mode The best packed block mode indexes.
|
|
* @param[out] quant_level The best color quant level.
|
|
* @param[out] quant_level_mod The best color quant level if endpoints are the same.
|
|
* @param[out] tmpbuf Preallocated scratch buffers for the compressor.
|
|
*
|
|
* @return The actual number of candidate matches returned.
|
|
*/
|
|
unsigned int compute_ideal_endpoint_formats(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
const endpoints& ep,
|
|
const int8_t* qwt_bitcounts,
|
|
const float* qwt_errors,
|
|
unsigned int tune_candidate_limit,
|
|
unsigned int start_block_mode,
|
|
unsigned int end_block_mode,
|
|
uint8_t partition_format_specifiers[TUNE_MAX_TRIAL_CANDIDATES][BLOCK_MAX_PARTITIONS],
|
|
int block_mode[TUNE_MAX_TRIAL_CANDIDATES],
|
|
quant_method quant_level[TUNE_MAX_TRIAL_CANDIDATES],
|
|
quant_method quant_level_mod[TUNE_MAX_TRIAL_CANDIDATES],
|
|
compression_working_buffers& tmpbuf);
|
|
|
|
/**
|
|
* @brief For a given 1 plane weight set recompute the endpoint colors.
|
|
*
|
|
* As we quantize and decimate weights the optimal endpoint colors may change slightly, so we must
|
|
* recompute the ideal colors for a specific weight set.
|
|
*
|
|
* @param blk The image block color data to compress.
|
|
* @param pi The partition info for the current trial.
|
|
* @param di The weight grid decimation table.
|
|
* @param dec_weights_uquant The quantized weight set.
|
|
* @param[in,out] ep The color endpoints (modifed in place).
|
|
* @param[out] rgbs_vectors The RGB+scale vectors for LDR blocks.
|
|
* @param[out] rgbo_vectors The RGB+offset vectors for HDR blocks.
|
|
*/
|
|
void recompute_ideal_colors_1plane(
|
|
const image_block& blk,
|
|
const partition_info& pi,
|
|
const decimation_info& di,
|
|
const uint8_t* dec_weights_uquant,
|
|
endpoints& ep,
|
|
vfloat4 rgbs_vectors[BLOCK_MAX_PARTITIONS],
|
|
vfloat4 rgbo_vectors[BLOCK_MAX_PARTITIONS]);
|
|
|
|
/**
|
|
* @brief For a given 2 plane weight set recompute the endpoint colors.
|
|
*
|
|
* As we quantize and decimate weights the optimal endpoint colors may change slightly, so we must
|
|
* recompute the ideal colors for a specific weight set.
|
|
*
|
|
* @param blk The image block color data to compress.
|
|
* @param bsd The block_size descriptor.
|
|
* @param di The weight grid decimation table.
|
|
* @param dec_weights_uquant_plane1 The quantized weight set for plane 1.
|
|
* @param dec_weights_uquant_plane2 The quantized weight set for plane 2.
|
|
* @param[in,out] ep The color endpoints (modifed in place).
|
|
* @param[out] rgbs_vector The RGB+scale color for LDR blocks.
|
|
* @param[out] rgbo_vector The RGB+offset color for HDR blocks.
|
|
* @param plane2_component The component assigned to plane 2.
|
|
*/
|
|
void recompute_ideal_colors_2planes(
|
|
const image_block& blk,
|
|
const block_size_descriptor& bsd,
|
|
const decimation_info& di,
|
|
const uint8_t* dec_weights_uquant_plane1,
|
|
const uint8_t* dec_weights_uquant_plane2,
|
|
endpoints& ep,
|
|
vfloat4& rgbs_vector,
|
|
vfloat4& rgbo_vector,
|
|
int plane2_component);
|
|
|
|
/**
|
|
* @brief Expand the angular tables needed for the alternative to PCA that we use.
|
|
*/
|
|
void prepare_angular_tables();
|
|
|
|
/**
|
|
* @brief Compute the angular endpoints for one plane for each block mode.
|
|
*
|
|
* @param only_always Only consider block modes that are always enabled.
|
|
* @param bsd The block size descriptor for the current trial.
|
|
* @param dec_weight_ideal_value The ideal decimated unquantized weight values.
|
|
* @param max_weight_quant The maximum block mode weight quantization allowed.
|
|
* @param[out] tmpbuf Preallocated scratch buffers for the compressor.
|
|
*/
|
|
void compute_angular_endpoints_1plane(
|
|
bool only_always,
|
|
const block_size_descriptor& bsd,
|
|
const float* dec_weight_ideal_value,
|
|
unsigned int max_weight_quant,
|
|
compression_working_buffers& tmpbuf);
|
|
|
|
/**
|
|
* @brief Compute the angular endpoints for two planes for each block mode.
|
|
*
|
|
* @param bsd The block size descriptor for the current trial.
|
|
* @param dec_weight_ideal_value The ideal decimated unquantized weight values.
|
|
* @param max_weight_quant The maximum block mode weight quantization allowed.
|
|
* @param[out] tmpbuf Preallocated scratch buffers for the compressor.
|
|
*/
|
|
void compute_angular_endpoints_2planes(
|
|
const block_size_descriptor& bsd,
|
|
const float* dec_weight_ideal_value,
|
|
unsigned int max_weight_quant,
|
|
compression_working_buffers& tmpbuf);
|
|
|
|
/* ============================================================================
|
|
Functionality for high level compression and decompression access.
|
|
============================================================================ */
|
|
|
|
/**
|
|
* @brief Compress an image block into a physical block.
|
|
*
|
|
* @param ctx The compressor context and configuration.
|
|
* @param blk The image block color data to compress.
|
|
* @param[out] pcb The physical compressed block output.
|
|
* @param[out] tmpbuf Preallocated scratch buffers for the compressor.
|
|
*/
|
|
void compress_block(
|
|
const astcenc_contexti& ctx,
|
|
const image_block& blk,
|
|
physical_compressed_block& pcb,
|
|
compression_working_buffers& tmpbuf);
|
|
|
|
/**
|
|
* @brief Decompress a symbolic block in to an image block.
|
|
*
|
|
* @param decode_mode The decode mode (LDR, HDR, etc).
|
|
* @param bsd The block size information.
|
|
* @param xpos The X coordinate of the block in the overall image.
|
|
* @param ypos The Y coordinate of the block in the overall image.
|
|
* @param zpos The Z coordinate of the block in the overall image.
|
|
* @param[out] blk The decompressed image block color data.
|
|
*/
|
|
void decompress_symbolic_block(
|
|
astcenc_profile decode_mode,
|
|
const block_size_descriptor& bsd,
|
|
int xpos,
|
|
int ypos,
|
|
int zpos,
|
|
const symbolic_compressed_block& scb,
|
|
image_block& blk);
|
|
|
|
/**
|
|
* @brief Compute the error between a symbolic block and the original input data.
|
|
*
|
|
* This function is specialized for 2 plane and 1 partition search.
|
|
*
|
|
* In RGBM mode this will reject blocks that attempt to encode a zero M value.
|
|
*
|
|
* @param config The compressor config.
|
|
* @param bsd The block size information.
|
|
* @param scb The symbolic compressed encoding.
|
|
* @param blk The original image block color data.
|
|
*
|
|
* @return Returns the computed error, or a negative value if the encoding
|
|
* should be rejected for any reason.
|
|
*/
|
|
float compute_symbolic_block_difference_2plane(
|
|
const astcenc_config& config,
|
|
const block_size_descriptor& bsd,
|
|
const symbolic_compressed_block& scb,
|
|
const image_block& blk);
|
|
|
|
/**
|
|
* @brief Compute the error between a symbolic block and the original input data.
|
|
*
|
|
* This function is specialized for 1 plane and N partition search.
|
|
*
|
|
* In RGBM mode this will reject blocks that attempt to encode a zero M value.
|
|
*
|
|
* @param config The compressor config.
|
|
* @param bsd The block size information.
|
|
* @param scb The symbolic compressed encoding.
|
|
* @param blk The original image block color data.
|
|
*
|
|
* @return Returns the computed error, or a negative value if the encoding
|
|
* should be rejected for any reason.
|
|
*/
|
|
float compute_symbolic_block_difference_1plane(
|
|
const astcenc_config& config,
|
|
const block_size_descriptor& bsd,
|
|
const symbolic_compressed_block& scb,
|
|
const image_block& blk);
|
|
|
|
/**
|
|
* @brief Compute the error between a symbolic block and the original input data.
|
|
*
|
|
* This function is specialized for 1 plane and 1 partition search.
|
|
*
|
|
* In RGBM mode this will reject blocks that attempt to encode a zero M value.
|
|
*
|
|
* @param config The compressor config.
|
|
* @param bsd The block size information.
|
|
* @param scb The symbolic compressed encoding.
|
|
* @param blk The original image block color data.
|
|
*
|
|
* @return Returns the computed error, or a negative value if the encoding
|
|
* should be rejected for any reason.
|
|
*/
|
|
float compute_symbolic_block_difference_1plane_1partition(
|
|
const astcenc_config& config,
|
|
const block_size_descriptor& bsd,
|
|
const symbolic_compressed_block& scb,
|
|
const image_block& blk);
|
|
|
|
/**
|
|
* @brief Convert a symbolic representation into a binary physical encoding.
|
|
*
|
|
* It is assumed that the symbolic encoding is valid and encodable, or
|
|
* previously flagged as an error block if an error color it to be encoded.
|
|
*
|
|
* @param bsd The block size information.
|
|
* @param scb The symbolic representation.
|
|
* @param[out] pcb The binary encoded data.
|
|
*/
|
|
void symbolic_to_physical(
|
|
const block_size_descriptor& bsd,
|
|
const symbolic_compressed_block& scb,
|
|
physical_compressed_block& pcb);
|
|
|
|
/**
|
|
* @brief Convert a binary physical encoding into a symbolic representation.
|
|
*
|
|
* This function can cope with arbitrary input data; output blocks will be
|
|
* flagged as an error block if the encoding is invalid.
|
|
*
|
|
* @param bsd The block size information.
|
|
* @param pcb The binary encoded data.
|
|
* @param[out] scb The output symbolic representation.
|
|
*/
|
|
void physical_to_symbolic(
|
|
const block_size_descriptor& bsd,
|
|
const physical_compressed_block& pcb,
|
|
symbolic_compressed_block& scb);
|
|
|
|
/* ============================================================================
|
|
Platform-specific functions.
|
|
============================================================================ */
|
|
/**
|
|
* @brief Allocate an aligned memory buffer.
|
|
*
|
|
* Allocated memory must be freed by aligned_free;
|
|
*
|
|
* @param size The desired buffer size.
|
|
* @param align The desired buffer alignment; must be 2^N.
|
|
*
|
|
* @return The memory buffer pointer or nullptr on allocation failure.
|
|
*/
|
|
template<typename T>
|
|
T* aligned_malloc(size_t size, size_t align)
|
|
{
|
|
void* ptr;
|
|
int error = 0;
|
|
|
|
#if defined(_WIN32)
|
|
ptr = _aligned_malloc(size, align);
|
|
#else
|
|
error = posix_memalign(&ptr, align, size);
|
|
#endif
|
|
|
|
if (error || (!ptr))
|
|
{
|
|
return nullptr;
|
|
}
|
|
|
|
return static_cast<T*>(ptr);
|
|
}
|
|
|
|
/**
|
|
* @brief Free an aligned memory buffer.
|
|
*
|
|
* @param ptr The buffer to free.
|
|
*/
|
|
template<typename T>
|
|
void aligned_free(T* ptr)
|
|
{
|
|
#if defined(_WIN32)
|
|
_aligned_free(reinterpret_cast<void*>(ptr));
|
|
#else
|
|
free(reinterpret_cast<void*>(ptr));
|
|
#endif
|
|
}
|
|
|
|
#endif
|