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![K. S. Ernest (iFire) Lee](/assets/img/avatar_default.png)
Co-authored-by: Gordon A Macpherson <gordon.a.macpherson@gmail.com> Co-authored-by: Rémi Verschelde <rverschelde@gmail.com>
1351 lines
45 KiB
C++
1351 lines
45 KiB
C++
// SPDX-License-Identifier: Apache-2.0
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// ----------------------------------------------------------------------------
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// Copyright 2011-2022 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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#if !defined(ASTCENC_DECOMPRESS_ONLY)
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/**
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* @brief Functions for finding best endpoint format.
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*
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* We assume there are two independent sources of error in any given partition:
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*
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* - Encoding choice errors
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* - Quantization errors
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*
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* Encoding choice errors are caused by encoder decisions. For example:
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*
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* - Using luminance instead of separate RGB components.
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* - Using a constant 1.0 alpha instead of storing an alpha component.
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* - Using RGB+scale instead of storing two full RGB endpoints.
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*
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* Quantization errors occur due to the limited precision we use for storage. These errors generally
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* scale with quantization level, but are not actually independent of color encoding. In particular:
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*
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* - If we can use offset encoding then quantization error is halved.
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* - If we can use blue-contraction then quantization error for RG is halved.
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* - If we use HDR endpoints the quantization error is higher.
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*
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* Apart from these effects, we assume the error is proportional to the quantization step size.
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*/
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#include "astcenc_internal.h"
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#include "astcenc_vecmathlib.h"
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#include <assert.h>
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/**
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* @brief Compute the errors of the endpoint line options for one partition.
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*
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* Uncorrelated data assumes storing completely independent RGBA channels for each endpoint. Same
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* chroma data assumes storing RGBA endpoints which pass though the origin (LDR only). RGBL data
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* assumes storing RGB + lumashift (HDR only). Luminance error assumes storing RGB channels as a
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* single value.
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*
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*
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* @param pi The partition info data.
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* @param partition_index The partition index to compule the error for.
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* @param blk The image block.
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* @param uncor_pline The endpoint line assuming uncorrelated endpoints.
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* @param[out] uncor_err The computed error for the uncorrelated endpoint line.
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* @param samec_pline The endpoint line assuming the same chroma for both endpoints.
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* @param[out] samec_err The computed error for the uncorrelated endpoint line.
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* @param rgbl_pline The endpoint line assuming RGB + lumashift data.
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* @param[out] rgbl_err The computed error for the RGB + lumashift endpoint line.
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* @param l_pline The endpoint line assuming luminance data.
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* @param[out] l_err The computed error for the luminance endpoint line.
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* @param[out] a_drop_err The computed error for dropping the alpha component.
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*/
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static void compute_error_squared_rgb_single_partition(
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const partition_info& pi,
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int partition_index,
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const image_block& blk,
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const processed_line3& uncor_pline,
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float& uncor_err,
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const processed_line3& samec_pline,
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float& samec_err,
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const processed_line3& rgbl_pline,
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float& rgbl_err,
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const processed_line3& l_pline,
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float& l_err,
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float& a_drop_err
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) {
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vfloat4 ews = blk.channel_weight;
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unsigned int texel_count = pi.partition_texel_count[partition_index];
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const uint8_t* texel_indexes = pi.texels_of_partition[partition_index];
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promise(texel_count > 0);
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vfloatacc a_drop_errv = vfloatacc::zero();
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vfloat default_a(blk.get_default_alpha());
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vfloatacc uncor_errv = vfloatacc::zero();
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vfloat uncor_bs0(uncor_pline.bs.lane<0>());
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vfloat uncor_bs1(uncor_pline.bs.lane<1>());
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vfloat uncor_bs2(uncor_pline.bs.lane<2>());
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vfloat uncor_amod0(uncor_pline.amod.lane<0>());
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vfloat uncor_amod1(uncor_pline.amod.lane<1>());
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vfloat uncor_amod2(uncor_pline.amod.lane<2>());
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vfloatacc samec_errv = vfloatacc::zero();
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vfloat samec_bs0(samec_pline.bs.lane<0>());
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vfloat samec_bs1(samec_pline.bs.lane<1>());
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vfloat samec_bs2(samec_pline.bs.lane<2>());
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vfloatacc rgbl_errv = vfloatacc::zero();
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vfloat rgbl_bs0(rgbl_pline.bs.lane<0>());
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vfloat rgbl_bs1(rgbl_pline.bs.lane<1>());
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vfloat rgbl_bs2(rgbl_pline.bs.lane<2>());
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vfloat rgbl_amod0(rgbl_pline.amod.lane<0>());
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vfloat rgbl_amod1(rgbl_pline.amod.lane<1>());
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vfloat rgbl_amod2(rgbl_pline.amod.lane<2>());
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vfloatacc l_errv = vfloatacc::zero();
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vfloat l_bs0(l_pline.bs.lane<0>());
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vfloat l_bs1(l_pline.bs.lane<1>());
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vfloat l_bs2(l_pline.bs.lane<2>());
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vint lane_ids = vint::lane_id();
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for (unsigned int i = 0; i < texel_count; i += ASTCENC_SIMD_WIDTH)
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{
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vint tix(texel_indexes + i);
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vmask mask = lane_ids < vint(texel_count);
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lane_ids += vint(ASTCENC_SIMD_WIDTH);
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// Compute the error that arises from just ditching alpha
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vfloat data_a = gatherf(blk.data_a, tix);
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vfloat alpha_diff = data_a - default_a;
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alpha_diff = alpha_diff * alpha_diff;
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haccumulate(a_drop_errv, alpha_diff, mask);
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vfloat data_r = gatherf(blk.data_r, tix);
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vfloat data_g = gatherf(blk.data_g, tix);
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vfloat data_b = gatherf(blk.data_b, tix);
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// Compute uncorrelated error
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vfloat param = data_r * uncor_bs0
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+ data_g * uncor_bs1
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+ data_b * uncor_bs2;
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vfloat dist0 = (uncor_amod0 + param * uncor_bs0) - data_r;
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vfloat dist1 = (uncor_amod1 + param * uncor_bs1) - data_g;
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vfloat dist2 = (uncor_amod2 + param * uncor_bs2) - data_b;
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vfloat error = dist0 * dist0 * ews.lane<0>()
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+ dist1 * dist1 * ews.lane<1>()
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+ dist2 * dist2 * ews.lane<2>();
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haccumulate(uncor_errv, error, mask);
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// Compute same chroma error - no "amod", its always zero
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param = data_r * samec_bs0
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+ data_g * samec_bs1
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+ data_b * samec_bs2;
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dist0 = (param * samec_bs0) - data_r;
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dist1 = (param * samec_bs1) - data_g;
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dist2 = (param * samec_bs2) - data_b;
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error = dist0 * dist0 * ews.lane<0>()
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+ dist1 * dist1 * ews.lane<1>()
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+ dist2 * dist2 * ews.lane<2>();
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haccumulate(samec_errv, error, mask);
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// Compute rgbl error
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param = data_r * rgbl_bs0
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+ data_g * rgbl_bs1
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+ data_b * rgbl_bs2;
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dist0 = (rgbl_amod0 + param * rgbl_bs0) - data_r;
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dist1 = (rgbl_amod1 + param * rgbl_bs1) - data_g;
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dist2 = (rgbl_amod2 + param * rgbl_bs2) - data_b;
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error = dist0 * dist0 * ews.lane<0>()
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+ dist1 * dist1 * ews.lane<1>()
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+ dist2 * dist2 * ews.lane<2>();
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haccumulate(rgbl_errv, error, mask);
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// Compute luma error - no "amod", its always zero
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param = data_r * l_bs0
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+ data_g * l_bs1
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+ data_b * l_bs2;
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dist0 = (param * l_bs0) - data_r;
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dist1 = (param * l_bs1) - data_g;
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dist2 = (param * l_bs2) - data_b;
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error = dist0 * dist0 * ews.lane<0>()
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+ dist1 * dist1 * ews.lane<1>()
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+ dist2 * dist2 * ews.lane<2>();
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haccumulate(l_errv, error, mask);
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}
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a_drop_err = hadd_s(a_drop_errv) * ews.lane<3>();
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uncor_err = hadd_s(uncor_errv);
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samec_err = hadd_s(samec_errv);
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rgbl_err = hadd_s(rgbl_errv);
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l_err = hadd_s(l_errv);
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}
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/**
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* @brief For a given set of input colors and partitioning determine endpoint encode errors.
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*
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* This function determines the color error that results from RGB-scale encoding (LDR only),
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* RGB-lumashift encoding (HDR only), luminance-encoding, and alpha drop. Also determines whether
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* the endpoints are eligible for offset encoding or blue-contraction
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*
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* @param blk The image block.
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* @param pi The partition info data.
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* @param ep The idealized endpoints.
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* @param[out] eci The resulting encoding choice error metrics.
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*/
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static void compute_encoding_choice_errors(
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const image_block& blk,
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const partition_info& pi,
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const endpoints& ep,
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encoding_choice_errors eci[BLOCK_MAX_PARTITIONS])
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{
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int partition_count = pi.partition_count;
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promise(partition_count > 0);
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partition_metrics pms[BLOCK_MAX_PARTITIONS];
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compute_avgs_and_dirs_3_comp_rgb(pi, blk, pms);
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for (int i = 0; i < partition_count; i++)
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{
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partition_metrics& pm = pms[i];
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line3 uncor_rgb_lines;
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line3 samec_rgb_lines; // for LDR-RGB-scale
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line3 rgb_luma_lines; // for HDR-RGB-scale
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processed_line3 uncor_rgb_plines;
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processed_line3 samec_rgb_plines;
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processed_line3 rgb_luma_plines;
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processed_line3 luminance_plines;
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float uncorr_rgb_error;
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float samechroma_rgb_error;
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float rgb_luma_error;
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float luminance_rgb_error;
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float alpha_drop_error;
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uncor_rgb_lines.a = pm.avg;
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uncor_rgb_lines.b = normalize_safe(pm.dir, unit3());
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samec_rgb_lines.a = vfloat4::zero();
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samec_rgb_lines.b = normalize_safe(pm.avg, unit3());
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rgb_luma_lines.a = pm.avg;
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rgb_luma_lines.b = unit3();
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uncor_rgb_plines.amod = uncor_rgb_lines.a - uncor_rgb_lines.b * dot3(uncor_rgb_lines.a, uncor_rgb_lines.b);
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uncor_rgb_plines.bs = uncor_rgb_lines.b;
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// Same chroma always goes though zero, so this is simpler than the others
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samec_rgb_plines.amod = vfloat4::zero();
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samec_rgb_plines.bs = samec_rgb_lines.b;
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rgb_luma_plines.amod = rgb_luma_lines.a - rgb_luma_lines.b * dot3(rgb_luma_lines.a, rgb_luma_lines.b);
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rgb_luma_plines.bs = rgb_luma_lines.b;
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// Luminance always goes though zero, so this is simpler than the others
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luminance_plines.amod = vfloat4::zero();
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luminance_plines.bs = unit3();
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compute_error_squared_rgb_single_partition(
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pi, i, blk,
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uncor_rgb_plines, uncorr_rgb_error,
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samec_rgb_plines, samechroma_rgb_error,
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rgb_luma_plines, rgb_luma_error,
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luminance_plines, luminance_rgb_error,
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alpha_drop_error);
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// Determine if we can offset encode RGB lanes
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vfloat4 endpt0 = ep.endpt0[i];
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vfloat4 endpt1 = ep.endpt1[i];
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vfloat4 endpt_diff = abs(endpt1 - endpt0);
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vmask4 endpt_can_offset = endpt_diff < vfloat4(0.12f * 65535.0f);
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bool can_offset_encode = (mask(endpt_can_offset) & 0x7) == 0x7;
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// Store out the settings
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eci[i].rgb_scale_error = (samechroma_rgb_error - uncorr_rgb_error) * 0.7f; // empirical
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eci[i].rgb_luma_error = (rgb_luma_error - uncorr_rgb_error) * 1.5f; // wild guess
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eci[i].luminance_error = (luminance_rgb_error - uncorr_rgb_error) * 3.0f; // empirical
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eci[i].alpha_drop_error = alpha_drop_error * 3.0f;
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eci[i].can_offset_encode = can_offset_encode;
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eci[i].can_blue_contract = !blk.is_luminance();
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}
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}
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/**
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* @brief For a given partition compute the error for every endpoint integer count and quant level.
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*
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* @param encode_hdr_rgb @c true if using HDR for RGB, @c false for LDR.
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* @param encode_hdr_alpha @c true if using HDR for alpha, @c false for LDR.
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* @param partition_index The partition index.
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* @param pi The partition info.
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* @param eci The encoding choice error metrics.
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* @param ep The idealized endpoints.
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* @param error_weight The resulting encoding choice error metrics.
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* @param[out] best_error The best error for each integer count and quant level.
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* @param[out] format_of_choice The preferred endpoint format for each integer count and quant level.
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*/
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static void compute_color_error_for_every_integer_count_and_quant_level(
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bool encode_hdr_rgb,
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bool encode_hdr_alpha,
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int partition_index,
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const partition_info& pi,
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const encoding_choice_errors& eci,
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const endpoints& ep,
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vfloat4 error_weight,
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float best_error[21][4],
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uint8_t format_of_choice[21][4]
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) {
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int partition_size = pi.partition_texel_count[partition_index];
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static const float baseline_quant_error[21 - QUANT_6] {
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(65536.0f * 65536.0f / 18.0f) / (5 * 5),
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(65536.0f * 65536.0f / 18.0f) / (7 * 7),
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(65536.0f * 65536.0f / 18.0f) / (9 * 9),
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(65536.0f * 65536.0f / 18.0f) / (11 * 11),
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(65536.0f * 65536.0f / 18.0f) / (15 * 15),
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(65536.0f * 65536.0f / 18.0f) / (19 * 19),
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(65536.0f * 65536.0f / 18.0f) / (23 * 23),
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(65536.0f * 65536.0f / 18.0f) / (31 * 31),
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(65536.0f * 65536.0f / 18.0f) / (39 * 39),
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(65536.0f * 65536.0f / 18.0f) / (47 * 47),
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(65536.0f * 65536.0f / 18.0f) / (63 * 63),
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(65536.0f * 65536.0f / 18.0f) / (79 * 79),
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(65536.0f * 65536.0f / 18.0f) / (95 * 95),
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(65536.0f * 65536.0f / 18.0f) / (127 * 127),
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(65536.0f * 65536.0f / 18.0f) / (159 * 159),
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(65536.0f * 65536.0f / 18.0f) / (191 * 191),
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(65536.0f * 65536.0f / 18.0f) / (255 * 255)
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};
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vfloat4 ep0 = ep.endpt0[partition_index];
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vfloat4 ep1 = ep.endpt1[partition_index];
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float ep1_min = hmin_rgb_s(ep1);
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ep1_min = astc::max(ep1_min, 0.0f);
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float error_weight_rgbsum = hadd_rgb_s(error_weight);
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float range_upper_limit_rgb = encode_hdr_rgb ? 61440.0f : 65535.0f;
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float range_upper_limit_alpha = encode_hdr_alpha ? 61440.0f : 65535.0f;
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// It is possible to get endpoint colors significantly outside [0,upper-limit] even if the
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// input data are safely contained in [0,upper-limit]; we need to add an error term for this
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vfloat4 offset(range_upper_limit_rgb, range_upper_limit_rgb, range_upper_limit_rgb, range_upper_limit_alpha);
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vfloat4 ep0_range_error_high = max(ep0 - offset, 0.0f);
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vfloat4 ep1_range_error_high = max(ep1 - offset, 0.0f);
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vfloat4 ep0_range_error_low = min(ep0, 0.0f);
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vfloat4 ep1_range_error_low = min(ep1, 0.0f);
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vfloat4 sum_range_error =
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(ep0_range_error_low * ep0_range_error_low) +
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(ep1_range_error_low * ep1_range_error_low) +
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(ep0_range_error_high * ep0_range_error_high) +
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(ep1_range_error_high * ep1_range_error_high);
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float rgb_range_error = dot3_s(sum_range_error, error_weight)
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* 0.5f * static_cast<float>(partition_size);
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float alpha_range_error = sum_range_error.lane<3>() * error_weight.lane<3>()
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* 0.5f * static_cast<float>(partition_size);
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if (encode_hdr_rgb)
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{
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// Collect some statistics
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float af, cf;
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if (ep1.lane<0>() > ep1.lane<1>() && ep1.lane<0>() > ep1.lane<2>())
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{
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af = ep1.lane<0>();
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cf = ep1.lane<0>() - ep0.lane<0>();
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}
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else if (ep1.lane<1>() > ep1.lane<2>())
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{
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af = ep1.lane<1>();
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cf = ep1.lane<1>() - ep0.lane<1>();
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}
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else
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{
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af = ep1.lane<2>();
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cf = ep1.lane<2>() - ep0.lane<2>();
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}
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// Estimate of color-component spread in high endpoint color
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float bf = af - ep1_min;
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vfloat4 prd = (ep1 - vfloat4(cf)).swz<0, 1, 2>();
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vfloat4 pdif = prd - ep0.swz<0, 1, 2>();
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// Estimate of color-component spread in low endpoint color
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float df = hmax_s(abs(pdif));
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int b = static_cast<int>(bf);
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int c = static_cast<int>(cf);
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int d = static_cast<int>(df);
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// Determine which one of the 6 submodes is likely to be used in case of an RGBO-mode
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int rgbo_mode = 5; // 7 bits per component
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// mode 4: 8 7 6
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if (b < 32768 && c < 16384)
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{
|
|
rgbo_mode = 4;
|
|
}
|
|
|
|
// mode 3: 9 6 7
|
|
if (b < 8192 && c < 16384)
|
|
{
|
|
rgbo_mode = 3;
|
|
}
|
|
|
|
// mode 2: 10 5 8
|
|
if (b < 2048 && c < 16384)
|
|
{
|
|
rgbo_mode = 2;
|
|
}
|
|
|
|
// mode 1: 11 6 5
|
|
if (b < 2048 && c < 1024)
|
|
{
|
|
rgbo_mode = 1;
|
|
}
|
|
|
|
// mode 0: 11 5 7
|
|
if (b < 1024 && c < 4096)
|
|
{
|
|
rgbo_mode = 0;
|
|
}
|
|
|
|
// Determine which one of the 9 submodes is likely to be used in case of an RGB-mode.
|
|
int rgb_mode = 8; // 8 bits per component, except 7 bits for blue
|
|
|
|
// mode 0: 9 7 6 7
|
|
if (b < 16384 && c < 8192 && d < 8192)
|
|
{
|
|
rgb_mode = 0;
|
|
}
|
|
|
|
// mode 1: 9 8 6 6
|
|
if (b < 32768 && c < 8192 && d < 4096)
|
|
{
|
|
rgb_mode = 1;
|
|
}
|
|
|
|
// mode 2: 10 6 7 7
|
|
if (b < 4096 && c < 8192 && d < 4096)
|
|
{
|
|
rgb_mode = 2;
|
|
}
|
|
|
|
// mode 3: 10 7 7 6
|
|
if (b < 8192 && c < 8192 && d < 2048)
|
|
{
|
|
rgb_mode = 3;
|
|
}
|
|
|
|
// mode 4: 11 8 6 5
|
|
if (b < 8192 && c < 2048 && d < 512)
|
|
{
|
|
rgb_mode = 4;
|
|
}
|
|
|
|
// mode 5: 11 6 8 6
|
|
if (b < 2048 && c < 8192 && d < 1024)
|
|
{
|
|
rgb_mode = 5;
|
|
}
|
|
|
|
// mode 6: 12 7 7 5
|
|
if (b < 2048 && c < 2048 && d < 256)
|
|
{
|
|
rgb_mode = 6;
|
|
}
|
|
|
|
// mode 7: 12 6 7 6
|
|
if (b < 1024 && c < 2048 && d < 512)
|
|
{
|
|
rgb_mode = 7;
|
|
}
|
|
|
|
static const float rgbo_error_scales[6] { 4.0f, 4.0f, 16.0f, 64.0f, 256.0f, 1024.0f };
|
|
static const float rgb_error_scales[9] { 64.0f, 64.0f, 16.0f, 16.0f, 4.0f, 4.0f, 1.0f, 1.0f, 384.0f };
|
|
|
|
float mode7mult = rgbo_error_scales[rgbo_mode] * 0.0015f; // Empirically determined ....
|
|
float mode11mult = rgb_error_scales[rgb_mode] * 0.010f; // Empirically determined ....
|
|
|
|
|
|
float lum_high = hadd_rgb_s(ep1) * (1.0f / 3.0f);
|
|
float lum_low = hadd_rgb_s(ep0) * (1.0f / 3.0f);
|
|
float lumdif = lum_high - lum_low;
|
|
float mode23mult = lumdif < 960 ? 4.0f : lumdif < 3968 ? 16.0f : 128.0f;
|
|
|
|
mode23mult *= 0.0005f; // Empirically determined ....
|
|
|
|
// Pick among the available HDR endpoint modes
|
|
for (int i = QUANT_2; i < QUANT_16; i++)
|
|
{
|
|
best_error[i][3] = ERROR_CALC_DEFAULT;
|
|
best_error[i][2] = ERROR_CALC_DEFAULT;
|
|
best_error[i][1] = ERROR_CALC_DEFAULT;
|
|
best_error[i][0] = ERROR_CALC_DEFAULT;
|
|
|
|
format_of_choice[i][3] = static_cast<uint8_t>(encode_hdr_alpha ? FMT_HDR_RGBA : FMT_HDR_RGB_LDR_ALPHA);
|
|
format_of_choice[i][2] = FMT_HDR_RGB;
|
|
format_of_choice[i][1] = FMT_HDR_RGB_SCALE;
|
|
format_of_choice[i][0] = FMT_HDR_LUMINANCE_LARGE_RANGE;
|
|
}
|
|
|
|
for (int i = QUANT_16; i <= QUANT_256; i++)
|
|
{
|
|
// The base_quant_error should depend on the scale-factor that would be used during
|
|
// actual encode of the color value
|
|
|
|
float base_quant_error = baseline_quant_error[i - QUANT_6] * static_cast<float>(partition_size);
|
|
float rgb_quantization_error = error_weight_rgbsum * base_quant_error * 2.0f;
|
|
float alpha_quantization_error = error_weight.lane<3>() * base_quant_error * 2.0f;
|
|
float rgba_quantization_error = rgb_quantization_error + alpha_quantization_error;
|
|
|
|
// For 8 integers, we have two encodings: one with HDR A and another one with LDR A
|
|
|
|
float full_hdr_rgba_error = rgba_quantization_error + rgb_range_error + alpha_range_error;
|
|
best_error[i][3] = full_hdr_rgba_error;
|
|
format_of_choice[i][3] = static_cast<uint8_t>(encode_hdr_alpha ? FMT_HDR_RGBA : FMT_HDR_RGB_LDR_ALPHA);
|
|
|
|
// For 6 integers, we have one HDR-RGB encoding
|
|
float full_hdr_rgb_error = (rgb_quantization_error * mode11mult) + rgb_range_error + eci.alpha_drop_error;
|
|
best_error[i][2] = full_hdr_rgb_error;
|
|
format_of_choice[i][2] = FMT_HDR_RGB;
|
|
|
|
// For 4 integers, we have one HDR-RGB-Scale encoding
|
|
float hdr_rgb_scale_error = (rgb_quantization_error * mode7mult) + rgb_range_error + eci.alpha_drop_error + eci.rgb_luma_error;
|
|
|
|
best_error[i][1] = hdr_rgb_scale_error;
|
|
format_of_choice[i][1] = FMT_HDR_RGB_SCALE;
|
|
|
|
// For 2 integers, we assume luminance-with-large-range
|
|
float hdr_luminance_error = (rgb_quantization_error * mode23mult) + rgb_range_error + eci.alpha_drop_error + eci.luminance_error;
|
|
best_error[i][0] = hdr_luminance_error;
|
|
format_of_choice[i][0] = FMT_HDR_LUMINANCE_LARGE_RANGE;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (int i = QUANT_2; i < QUANT_6; i++)
|
|
{
|
|
best_error[i][3] = ERROR_CALC_DEFAULT;
|
|
best_error[i][2] = ERROR_CALC_DEFAULT;
|
|
best_error[i][1] = ERROR_CALC_DEFAULT;
|
|
best_error[i][0] = ERROR_CALC_DEFAULT;
|
|
|
|
format_of_choice[i][3] = FMT_RGBA;
|
|
format_of_choice[i][2] = FMT_RGB;
|
|
format_of_choice[i][1] = FMT_RGB_SCALE;
|
|
format_of_choice[i][0] = FMT_LUMINANCE;
|
|
}
|
|
|
|
float base_quant_error_rgb = error_weight_rgbsum * static_cast<float>(partition_size);
|
|
float base_quant_error_a = error_weight.lane<3>() * static_cast<float>(partition_size);
|
|
float base_quant_error_rgba = base_quant_error_rgb + base_quant_error_a;
|
|
|
|
float error_scale_bc_rgba = eci.can_blue_contract ? 0.625f : 1.0f;
|
|
float error_scale_oe_rgba = eci.can_offset_encode ? 0.5f : 1.0f;
|
|
|
|
float error_scale_bc_rgb = eci.can_blue_contract ? 0.5f : 1.0f;
|
|
float error_scale_oe_rgb = eci.can_offset_encode ? 0.25f : 1.0f;
|
|
|
|
// Pick among the available LDR endpoint modes
|
|
for (int i = QUANT_6; i <= QUANT_256; i++)
|
|
{
|
|
// Offset encoding not possible at higher quant levels
|
|
if (i >= QUANT_192)
|
|
{
|
|
error_scale_oe_rgba = 1.0f;
|
|
error_scale_oe_rgb = 1.0f;
|
|
}
|
|
|
|
float base_quant_error = baseline_quant_error[i - QUANT_6];
|
|
float quant_error_rgb = base_quant_error_rgb * base_quant_error;
|
|
float quant_error_rgba = base_quant_error_rgba * base_quant_error;
|
|
|
|
// 8 integers can encode as RGBA+RGBA
|
|
float full_ldr_rgba_error = quant_error_rgba
|
|
* error_scale_bc_rgba
|
|
* error_scale_oe_rgba
|
|
+ rgb_range_error
|
|
+ alpha_range_error;
|
|
|
|
best_error[i][3] = full_ldr_rgba_error;
|
|
format_of_choice[i][3] = FMT_RGBA;
|
|
|
|
// 6 integers can encode as RGB+RGB or RGBS+AA
|
|
float full_ldr_rgb_error = quant_error_rgb
|
|
* error_scale_bc_rgb
|
|
* error_scale_oe_rgb
|
|
+ rgb_range_error
|
|
+ eci.alpha_drop_error;
|
|
|
|
float rgbs_alpha_error = quant_error_rgba
|
|
+ eci.rgb_scale_error
|
|
+ rgb_range_error
|
|
+ alpha_range_error;
|
|
|
|
if (rgbs_alpha_error < full_ldr_rgb_error)
|
|
{
|
|
best_error[i][2] = rgbs_alpha_error;
|
|
format_of_choice[i][2] = FMT_RGB_SCALE_ALPHA;
|
|
}
|
|
else
|
|
{
|
|
best_error[i][2] = full_ldr_rgb_error;
|
|
format_of_choice[i][2] = FMT_RGB;
|
|
}
|
|
|
|
// 4 integers can encode as RGBS or LA+LA
|
|
float ldr_rgbs_error = quant_error_rgb
|
|
+ rgb_range_error
|
|
+ eci.alpha_drop_error
|
|
+ eci.rgb_scale_error;
|
|
|
|
float lum_alpha_error = quant_error_rgba
|
|
+ rgb_range_error
|
|
+ alpha_range_error
|
|
+ eci.luminance_error;
|
|
|
|
if (ldr_rgbs_error < lum_alpha_error)
|
|
{
|
|
best_error[i][1] = ldr_rgbs_error;
|
|
format_of_choice[i][1] = FMT_RGB_SCALE;
|
|
}
|
|
else
|
|
{
|
|
best_error[i][1] = lum_alpha_error;
|
|
format_of_choice[i][1] = FMT_LUMINANCE_ALPHA;
|
|
}
|
|
|
|
// 2 integers can encode as L+L
|
|
float luminance_error = quant_error_rgb
|
|
+ rgb_range_error
|
|
+ eci.alpha_drop_error
|
|
+ eci.luminance_error;
|
|
|
|
best_error[i][0] = luminance_error;
|
|
format_of_choice[i][0] = FMT_LUMINANCE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief For one partition compute the best format and quantization for a given bit count.
|
|
*
|
|
* @param best_combined_error The best error for each quant level and integer count.
|
|
* @param best_combined_format The best format for each quant level and integer count.
|
|
* @param bits_available The number of bits available for encoding.
|
|
* @param[out] best_quant_level The output best color quant level.
|
|
* @param[out] best_format The output best color format.
|
|
*
|
|
* @return The output error for the best pairing.
|
|
*/
|
|
static float one_partition_find_best_combination_for_bitcount(
|
|
const float best_combined_error[21][4],
|
|
const uint8_t best_combined_format[21][4],
|
|
int bits_available,
|
|
uint8_t& best_quant_level,
|
|
uint8_t& best_format
|
|
) {
|
|
int best_integer_count = 0;
|
|
float best_integer_count_error = ERROR_CALC_DEFAULT;
|
|
|
|
for (int integer_count = 1; integer_count <= 4; integer_count++)
|
|
{
|
|
// Compute the quantization level for a given number of integers and a given number of bits
|
|
int quant_level = quant_mode_table[integer_count][bits_available];
|
|
|
|
// Don't have enough bits to represent a given endpoint format at all!
|
|
if (quant_level < QUANT_6)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
float integer_count_error = best_combined_error[quant_level][integer_count - 1];
|
|
if (integer_count_error < best_integer_count_error)
|
|
{
|
|
best_integer_count_error = integer_count_error;
|
|
best_integer_count = integer_count - 1;
|
|
}
|
|
}
|
|
|
|
int ql = quant_mode_table[best_integer_count + 1][bits_available];
|
|
|
|
best_quant_level = static_cast<uint8_t>(ql);
|
|
best_format = FMT_LUMINANCE;
|
|
|
|
if (ql >= QUANT_6)
|
|
{
|
|
best_format = best_combined_format[ql][best_integer_count];
|
|
}
|
|
|
|
return best_integer_count_error;
|
|
}
|
|
|
|
/**
|
|
* @brief For 2 partitions compute the best format combinations for every pair of quant mode and integer count.
|
|
*
|
|
* @param best_error The best error for a single endpoint quant level and integer count.
|
|
* @param best_format The best format for a single endpoint quant level and integer count.
|
|
* @param[out] best_combined_error The best combined error pairings for the 2 partitions.
|
|
* @param[out] best_combined_format The best combined format pairings for the 2 partitions.
|
|
*/
|
|
static void two_partitions_find_best_combination_for_every_quantization_and_integer_count(
|
|
const float best_error[2][21][4], // indexed by (partition, quant-level, integer-pair-count-minus-1)
|
|
const uint8_t best_format[2][21][4],
|
|
float best_combined_error[21][7], // indexed by (quant-level, integer-pair-count-minus-2)
|
|
uint8_t best_combined_format[21][7][2]
|
|
) {
|
|
for (int i = QUANT_2; i <= QUANT_256; i++)
|
|
{
|
|
for (int j = 0; j < 7; j++)
|
|
{
|
|
best_combined_error[i][j] = ERROR_CALC_DEFAULT;
|
|
}
|
|
}
|
|
|
|
for (int quant = QUANT_6; quant <= QUANT_256; quant++)
|
|
{
|
|
for (int i = 0; i < 4; i++) // integer-count for first endpoint-pair
|
|
{
|
|
for (int j = 0; j < 4; j++) // integer-count for second endpoint-pair
|
|
{
|
|
int low2 = astc::min(i, j);
|
|
int high2 = astc::max(i, j);
|
|
if ((high2 - low2) > 1)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
int intcnt = i + j;
|
|
float errorterm = astc::min(best_error[0][quant][i] + best_error[1][quant][j], 1e10f);
|
|
if (errorterm <= best_combined_error[quant][intcnt])
|
|
{
|
|
best_combined_error[quant][intcnt] = errorterm;
|
|
best_combined_format[quant][intcnt][0] = best_format[0][quant][i];
|
|
best_combined_format[quant][intcnt][1] = best_format[1][quant][j];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief For 2 partitions compute the best format and quantization for a given bit count.
|
|
*
|
|
* @param best_combined_error The best error for each quant level and integer count.
|
|
* @param best_combined_format The best format for each quant level and integer count.
|
|
* @param bits_available The number of bits available for encoding.
|
|
* @param[out] best_quant_level The output best color quant level.
|
|
* @param[out] best_quant_level_mod The output best color quant level assuming two more bits are available.
|
|
* @param[out] best_formats The output best color formats.
|
|
*
|
|
* @return The output error for the best pairing.
|
|
*/
|
|
static float two_partitions_find_best_combination_for_bitcount(
|
|
float best_combined_error[21][7],
|
|
uint8_t best_combined_format[21][7][2],
|
|
int bits_available,
|
|
uint8_t& best_quant_level,
|
|
uint8_t& best_quant_level_mod,
|
|
uint8_t* best_formats
|
|
) {
|
|
int best_integer_count = 0;
|
|
float best_integer_count_error = ERROR_CALC_DEFAULT;
|
|
|
|
for (int integer_count = 2; integer_count <= 8; integer_count++)
|
|
{
|
|
// Compute the quantization level for a given number of integers and a given number of bits
|
|
int quant_level = quant_mode_table[integer_count][bits_available];
|
|
|
|
// Don't have enough bits to represent a given endpoint format at all!
|
|
if (quant_level < QUANT_6)
|
|
{
|
|
break;
|
|
}
|
|
|
|
float integer_count_error = best_combined_error[quant_level][integer_count - 2];
|
|
if (integer_count_error < best_integer_count_error)
|
|
{
|
|
best_integer_count_error = integer_count_error;
|
|
best_integer_count = integer_count;
|
|
}
|
|
}
|
|
|
|
int ql = quant_mode_table[best_integer_count][bits_available];
|
|
int ql_mod = quant_mode_table[best_integer_count][bits_available + 2];
|
|
|
|
best_quant_level = static_cast<uint8_t>(ql);
|
|
best_quant_level_mod = static_cast<uint8_t>(ql_mod);
|
|
|
|
if (ql >= QUANT_6)
|
|
{
|
|
for (int i = 0; i < 2; i++)
|
|
{
|
|
best_formats[i] = best_combined_format[ql][best_integer_count - 2][i];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (int i = 0; i < 2; i++)
|
|
{
|
|
best_formats[i] = FMT_LUMINANCE;
|
|
}
|
|
}
|
|
|
|
return best_integer_count_error;
|
|
}
|
|
|
|
/**
|
|
* @brief For 3 partitions compute the best format combinations for every pair of quant mode and integer count.
|
|
*
|
|
* @param best_error The best error for a single endpoint quant level and integer count.
|
|
* @param best_format The best format for a single endpoint quant level and integer count.
|
|
* @param[out] best_combined_error The best combined error pairings for the 3 partitions.
|
|
* @param[out] best_combined_format The best combined format pairings for the 3 partitions.
|
|
*/
|
|
static void three_partitions_find_best_combination_for_every_quantization_and_integer_count(
|
|
const float best_error[3][21][4], // indexed by (partition, quant-level, integer-count)
|
|
const uint8_t best_format[3][21][4],
|
|
float best_combined_error[21][10],
|
|
uint8_t best_combined_format[21][10][3]
|
|
) {
|
|
for (int i = QUANT_2; i <= QUANT_256; i++)
|
|
{
|
|
for (int j = 0; j < 10; j++)
|
|
{
|
|
best_combined_error[i][j] = ERROR_CALC_DEFAULT;
|
|
}
|
|
}
|
|
|
|
for (int quant = QUANT_6; quant <= QUANT_256; quant++)
|
|
{
|
|
for (int i = 0; i < 4; i++) // integer-count for first endpoint-pair
|
|
{
|
|
for (int j = 0; j < 4; j++) // integer-count for second endpoint-pair
|
|
{
|
|
int low2 = astc::min(i, j);
|
|
int high2 = astc::max(i, j);
|
|
if ((high2 - low2) > 1)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
for (int k = 0; k < 4; k++) // integer-count for third endpoint-pair
|
|
{
|
|
int low3 = astc::min(k, low2);
|
|
int high3 = astc::max(k, high2);
|
|
if ((high3 - low3) > 1)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
int intcnt = i + j + k;
|
|
float errorterm = astc::min(best_error[0][quant][i] + best_error[1][quant][j] + best_error[2][quant][k], 1e10f);
|
|
if (errorterm <= best_combined_error[quant][intcnt])
|
|
{
|
|
best_combined_error[quant][intcnt] = errorterm;
|
|
best_combined_format[quant][intcnt][0] = best_format[0][quant][i];
|
|
best_combined_format[quant][intcnt][1] = best_format[1][quant][j];
|
|
best_combined_format[quant][intcnt][2] = best_format[2][quant][k];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief For 3 partitions compute the best format and quantization for a given bit count.
|
|
*
|
|
* @param best_combined_error The best error for each quant level and integer count.
|
|
* @param best_combined_format The best format for each quant level and integer count.
|
|
* @param bits_available The number of bits available for encoding.
|
|
* @param[out] best_quant_level The output best color quant level.
|
|
* @param[out] best_quant_level_mod The output best color quant level assuming two more bits are available.
|
|
* @param[out] best_formats The output best color formats.
|
|
*
|
|
* @return The output error for the best pairing.
|
|
*/
|
|
static float three_partitions_find_best_combination_for_bitcount(
|
|
const float best_combined_error[21][10],
|
|
const uint8_t best_combined_format[21][10][3],
|
|
int bits_available,
|
|
uint8_t& best_quant_level,
|
|
uint8_t& best_quant_level_mod,
|
|
uint8_t* best_formats
|
|
) {
|
|
int best_integer_count = 0;
|
|
float best_integer_count_error = ERROR_CALC_DEFAULT;
|
|
|
|
for (int integer_count = 3; integer_count <= 9; integer_count++)
|
|
{
|
|
// Compute the quantization level for a given number of integers and a given number of bits
|
|
int quant_level = quant_mode_table[integer_count][bits_available];
|
|
|
|
// Don't have enough bits to represent a given endpoint format at all!
|
|
if (quant_level < QUANT_6)
|
|
{
|
|
break;
|
|
}
|
|
|
|
float integer_count_error = best_combined_error[quant_level][integer_count - 3];
|
|
if (integer_count_error < best_integer_count_error)
|
|
{
|
|
best_integer_count_error = integer_count_error;
|
|
best_integer_count = integer_count;
|
|
}
|
|
}
|
|
|
|
int ql = quant_mode_table[best_integer_count][bits_available];
|
|
int ql_mod = quant_mode_table[best_integer_count][bits_available + 5];
|
|
|
|
best_quant_level = static_cast<uint8_t>(ql);
|
|
best_quant_level_mod = static_cast<uint8_t>(ql_mod);
|
|
|
|
if (ql >= QUANT_6)
|
|
{
|
|
for (int i = 0; i < 3; i++)
|
|
{
|
|
best_formats[i] = best_combined_format[ql][best_integer_count - 3][i];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (int i = 0; i < 3; i++)
|
|
{
|
|
best_formats[i] = FMT_LUMINANCE;
|
|
}
|
|
}
|
|
|
|
return best_integer_count_error;
|
|
}
|
|
|
|
/**
|
|
* @brief For 4 partitions compute the best format combinations for every pair of quant mode and integer count.
|
|
*
|
|
* @param best_error The best error for a single endpoint quant level and integer count.
|
|
* @param best_format The best format for a single endpoint quant level and integer count.
|
|
* @param[out] best_combined_error The best combined error pairings for the 4 partitions.
|
|
* @param[out] best_combined_format The best combined format pairings for the 4 partitions.
|
|
*/
|
|
static void four_partitions_find_best_combination_for_every_quantization_and_integer_count(
|
|
const float best_error[4][21][4], // indexed by (partition, quant-level, integer-count)
|
|
const uint8_t best_format[4][21][4],
|
|
float best_combined_error[21][13],
|
|
uint8_t best_combined_format[21][13][4]
|
|
) {
|
|
for (int i = QUANT_2; i <= QUANT_256; i++)
|
|
{
|
|
for (int j = 0; j < 13; j++)
|
|
{
|
|
best_combined_error[i][j] = ERROR_CALC_DEFAULT;
|
|
}
|
|
}
|
|
|
|
for (int quant = QUANT_6; quant <= QUANT_256; quant++)
|
|
{
|
|
for (int i = 0; i < 4; i++) // integer-count for first endpoint-pair
|
|
{
|
|
for (int j = 0; j < 4; j++) // integer-count for second endpoint-pair
|
|
{
|
|
int low2 = astc::min(i, j);
|
|
int high2 = astc::max(i, j);
|
|
if ((high2 - low2) > 1)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
for (int k = 0; k < 4; k++) // integer-count for third endpoint-pair
|
|
{
|
|
int low3 = astc::min(k, low2);
|
|
int high3 = astc::max(k, high2);
|
|
if ((high3 - low3) > 1)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
for (int l = 0; l < 4; l++) // integer-count for fourth endpoint-pair
|
|
{
|
|
int low4 = astc::min(l, low3);
|
|
int high4 = astc::max(l, high3);
|
|
if ((high4 - low4) > 1)
|
|
{
|
|
continue;
|
|
}
|
|
|
|
int intcnt = i + j + k + l;
|
|
float errorterm = astc::min(best_error[0][quant][i] + best_error[1][quant][j] + best_error[2][quant][k] + best_error[3][quant][l], 1e10f);
|
|
if (errorterm <= best_combined_error[quant][intcnt])
|
|
{
|
|
best_combined_error[quant][intcnt] = errorterm;
|
|
best_combined_format[quant][intcnt][0] = best_format[0][quant][i];
|
|
best_combined_format[quant][intcnt][1] = best_format[1][quant][j];
|
|
best_combined_format[quant][intcnt][2] = best_format[2][quant][k];
|
|
best_combined_format[quant][intcnt][3] = best_format[3][quant][l];
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* @brief For 4 partitions compute the best format and quantization for a given bit count.
|
|
*
|
|
* @param best_combined_error The best error for each quant level and integer count.
|
|
* @param best_combined_format The best format for each quant level and integer count.
|
|
* @param bits_available The number of bits available for encoding.
|
|
* @param[out] best_quant_level The output best color quant level.
|
|
* @param[out] best_quant_level_mod The output best color quant level assuming two more bits are available.
|
|
* @param[out] best_formats The output best color formats.
|
|
*
|
|
* @return best_error The output error for the best pairing.
|
|
*/
|
|
static float four_partitions_find_best_combination_for_bitcount(
|
|
const float best_combined_error[21][13],
|
|
const uint8_t best_combined_format[21][13][4],
|
|
int bits_available,
|
|
uint8_t& best_quant_level,
|
|
uint8_t& best_quant_level_mod,
|
|
uint8_t* best_formats
|
|
) {
|
|
int best_integer_count = 0;
|
|
float best_integer_count_error = ERROR_CALC_DEFAULT;
|
|
|
|
for (int integer_count = 4; integer_count <= 9; integer_count++)
|
|
{
|
|
// Compute the quantization level for a given number of integers and a given number of bits
|
|
int quant_level = quant_mode_table[integer_count][bits_available];
|
|
|
|
// Don't have enough bits to represent a given endpoint format at all!
|
|
if (quant_level < QUANT_6)
|
|
{
|
|
break;
|
|
}
|
|
|
|
float integer_count_error = best_combined_error[quant_level][integer_count - 4];
|
|
if (integer_count_error < best_integer_count_error)
|
|
{
|
|
best_integer_count_error = integer_count_error;
|
|
best_integer_count = integer_count;
|
|
}
|
|
}
|
|
|
|
int ql = quant_mode_table[best_integer_count][bits_available];
|
|
int ql_mod = quant_mode_table[best_integer_count][bits_available + 8];
|
|
|
|
best_quant_level = static_cast<uint8_t>(ql);
|
|
best_quant_level_mod = static_cast<uint8_t>(ql_mod);
|
|
|
|
if (ql >= QUANT_6)
|
|
{
|
|
for (int i = 0; i < 4; i++)
|
|
{
|
|
best_formats[i] = best_combined_format[ql][best_integer_count - 4][i];
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (int i = 0; i < 4; i++)
|
|
{
|
|
best_formats[i] = FMT_LUMINANCE;
|
|
}
|
|
}
|
|
|
|
return best_integer_count_error;
|
|
}
|
|
|
|
/* See header for documentation. */
|
|
unsigned int compute_ideal_endpoint_formats(
|
|
const partition_info& pi,
|
|
const image_block& blk,
|
|
const endpoints& ep,
|
|
// bitcounts and errors computed for the various quantization methods
|
|
const int8_t* qwt_bitcounts,
|
|
const float* qwt_errors,
|
|
unsigned int tune_candidate_limit,
|
|
unsigned int start_block_mode,
|
|
unsigned int end_block_mode,
|
|
// output data
|
|
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
|
|
) {
|
|
int partition_count = pi.partition_count;
|
|
|
|
promise(partition_count > 0);
|
|
|
|
bool encode_hdr_rgb = static_cast<bool>(blk.rgb_lns[0]);
|
|
bool encode_hdr_alpha = static_cast<bool>(blk.alpha_lns[0]);
|
|
|
|
// Compute the errors that result from various encoding choices (such as using luminance instead
|
|
// of RGB, discarding Alpha, using RGB-scale in place of two separate RGB endpoints and so on)
|
|
encoding_choice_errors eci[BLOCK_MAX_PARTITIONS];
|
|
compute_encoding_choice_errors(blk, pi, ep, eci);
|
|
|
|
float best_error[BLOCK_MAX_PARTITIONS][21][4];
|
|
uint8_t format_of_choice[BLOCK_MAX_PARTITIONS][21][4];
|
|
for (int i = 0; i < partition_count; i++)
|
|
{
|
|
compute_color_error_for_every_integer_count_and_quant_level(
|
|
encode_hdr_rgb, encode_hdr_alpha, i,
|
|
pi, eci[i], ep, blk.channel_weight, best_error[i],
|
|
format_of_choice[i]);
|
|
}
|
|
|
|
float* errors_of_best_combination = tmpbuf.errors_of_best_combination;
|
|
uint8_t* best_quant_levels = tmpbuf.best_quant_levels;
|
|
uint8_t* best_quant_levels_mod = tmpbuf.best_quant_levels_mod;
|
|
uint8_t (&best_ep_formats)[WEIGHTS_MAX_BLOCK_MODES][BLOCK_MAX_PARTITIONS] = tmpbuf.best_ep_formats;
|
|
|
|
// Ensure that the first iteration understep contains data that will never be picked
|
|
vfloat clear_error(ERROR_CALC_DEFAULT);
|
|
vint clear_quant(0);
|
|
|
|
unsigned int packed_start_block_mode = round_down_to_simd_multiple_vla(start_block_mode);
|
|
storea(clear_error, errors_of_best_combination + packed_start_block_mode);
|
|
store_nbytes(clear_quant, best_quant_levels + packed_start_block_mode);
|
|
store_nbytes(clear_quant, best_quant_levels_mod + packed_start_block_mode);
|
|
|
|
// Ensure that last iteration overstep contains data that will never be picked
|
|
unsigned int packed_end_block_mode = round_down_to_simd_multiple_vla(end_block_mode - 1);
|
|
storea(clear_error, errors_of_best_combination + packed_end_block_mode);
|
|
store_nbytes(clear_quant, best_quant_levels + packed_end_block_mode);
|
|
store_nbytes(clear_quant, best_quant_levels_mod + packed_end_block_mode);
|
|
|
|
// Track a scalar best to avoid expensive search at least once ...
|
|
float error_of_best_combination = ERROR_CALC_DEFAULT;
|
|
int index_of_best_combination = -1;
|
|
|
|
// The block contains 1 partition
|
|
if (partition_count == 1)
|
|
{
|
|
for (unsigned int i = start_block_mode; i < end_block_mode; i++)
|
|
{
|
|
if (qwt_errors[i] >= ERROR_CALC_DEFAULT)
|
|
{
|
|
errors_of_best_combination[i] = ERROR_CALC_DEFAULT;
|
|
continue;
|
|
}
|
|
|
|
float error_of_best = one_partition_find_best_combination_for_bitcount(
|
|
best_error[0], format_of_choice[0], qwt_bitcounts[i],
|
|
best_quant_levels[i], best_ep_formats[i][0]);
|
|
|
|
float total_error = error_of_best + qwt_errors[i];
|
|
errors_of_best_combination[i] = total_error;
|
|
best_quant_levels_mod[i] = best_quant_levels[i];
|
|
|
|
if (total_error < error_of_best_combination)
|
|
{
|
|
error_of_best_combination = total_error;
|
|
index_of_best_combination = i;
|
|
}
|
|
}
|
|
}
|
|
// The block contains 2 partitions
|
|
else if (partition_count == 2)
|
|
{
|
|
float combined_best_error[21][7];
|
|
uint8_t formats_of_choice[21][7][2];
|
|
|
|
two_partitions_find_best_combination_for_every_quantization_and_integer_count(
|
|
best_error, format_of_choice, combined_best_error, formats_of_choice);
|
|
|
|
assert(start_block_mode == 0);
|
|
for (unsigned int i = 0; i < end_block_mode; i++)
|
|
{
|
|
if (qwt_errors[i] >= ERROR_CALC_DEFAULT)
|
|
{
|
|
errors_of_best_combination[i] = ERROR_CALC_DEFAULT;
|
|
continue;
|
|
}
|
|
|
|
float error_of_best = two_partitions_find_best_combination_for_bitcount(
|
|
combined_best_error, formats_of_choice, qwt_bitcounts[i],
|
|
best_quant_levels[i], best_quant_levels_mod[i],
|
|
best_ep_formats[i]);
|
|
|
|
float total_error = error_of_best + qwt_errors[i];
|
|
errors_of_best_combination[i] = total_error;
|
|
|
|
if (total_error < error_of_best_combination)
|
|
{
|
|
error_of_best_combination = total_error;
|
|
index_of_best_combination = i;
|
|
}
|
|
}
|
|
}
|
|
// The block contains 3 partitions
|
|
else if (partition_count == 3)
|
|
{
|
|
float combined_best_error[21][10];
|
|
uint8_t formats_of_choice[21][10][3];
|
|
|
|
three_partitions_find_best_combination_for_every_quantization_and_integer_count(
|
|
best_error, format_of_choice, combined_best_error, formats_of_choice);
|
|
|
|
assert(start_block_mode == 0);
|
|
for (unsigned int i = 0; i < end_block_mode; i++)
|
|
{
|
|
if (qwt_errors[i] >= ERROR_CALC_DEFAULT)
|
|
{
|
|
errors_of_best_combination[i] = ERROR_CALC_DEFAULT;
|
|
continue;
|
|
}
|
|
|
|
float error_of_best = three_partitions_find_best_combination_for_bitcount(
|
|
combined_best_error, formats_of_choice, qwt_bitcounts[i],
|
|
best_quant_levels[i], best_quant_levels_mod[i],
|
|
best_ep_formats[i]);
|
|
|
|
float total_error = error_of_best + qwt_errors[i];
|
|
errors_of_best_combination[i] = total_error;
|
|
|
|
if (total_error < error_of_best_combination)
|
|
{
|
|
error_of_best_combination = total_error;
|
|
index_of_best_combination = i;
|
|
}
|
|
}
|
|
}
|
|
// The block contains 4 partitions
|
|
else // if (partition_count == 4)
|
|
{
|
|
assert(partition_count == 4);
|
|
float combined_best_error[21][13];
|
|
uint8_t formats_of_choice[21][13][4];
|
|
|
|
four_partitions_find_best_combination_for_every_quantization_and_integer_count(
|
|
best_error, format_of_choice, combined_best_error, formats_of_choice);
|
|
|
|
assert(start_block_mode == 0);
|
|
for (unsigned int i = 0; i < end_block_mode; i++)
|
|
{
|
|
if (qwt_errors[i] >= ERROR_CALC_DEFAULT)
|
|
{
|
|
errors_of_best_combination[i] = ERROR_CALC_DEFAULT;
|
|
continue;
|
|
}
|
|
|
|
float error_of_best = four_partitions_find_best_combination_for_bitcount(
|
|
combined_best_error, formats_of_choice, qwt_bitcounts[i],
|
|
best_quant_levels[i], best_quant_levels_mod[i],
|
|
best_ep_formats[i]);
|
|
|
|
float total_error = error_of_best + qwt_errors[i];
|
|
errors_of_best_combination[i] = total_error;
|
|
|
|
if (total_error < error_of_best_combination)
|
|
{
|
|
error_of_best_combination = total_error;
|
|
index_of_best_combination = i;
|
|
}
|
|
}
|
|
}
|
|
|
|
int best_error_weights[TUNE_MAX_TRIAL_CANDIDATES];
|
|
|
|
// Fast path the first result and avoid the list search for trial 0
|
|
best_error_weights[0] = index_of_best_combination;
|
|
if (index_of_best_combination >= 0)
|
|
{
|
|
errors_of_best_combination[index_of_best_combination] = ERROR_CALC_DEFAULT;
|
|
}
|
|
|
|
// Search the remaining results and pick the best candidate modes for trial 1+
|
|
for (unsigned int i = 1; i < tune_candidate_limit; i++)
|
|
{
|
|
vint vbest_error_index(-1);
|
|
vfloat vbest_ep_error(ERROR_CALC_DEFAULT);
|
|
|
|
start_block_mode = round_down_to_simd_multiple_vla(start_block_mode);
|
|
vint lane_ids = vint::lane_id() + vint(start_block_mode);
|
|
for (unsigned int j = start_block_mode; j < end_block_mode; j += ASTCENC_SIMD_WIDTH)
|
|
{
|
|
vfloat err = vfloat(errors_of_best_combination + j);
|
|
vmask mask = err < vbest_ep_error;
|
|
vbest_ep_error = select(vbest_ep_error, err, mask);
|
|
vbest_error_index = select(vbest_error_index, lane_ids, mask);
|
|
lane_ids += vint(ASTCENC_SIMD_WIDTH);
|
|
}
|
|
|
|
// Pick best mode from the SIMD result, using lowest matching index to ensure invariance
|
|
vmask lanes_min_error = vbest_ep_error == hmin(vbest_ep_error);
|
|
vbest_error_index = select(vint(0x7FFFFFFF), vbest_error_index, lanes_min_error);
|
|
vbest_error_index = hmin(vbest_error_index);
|
|
int best_error_index = vbest_error_index.lane<0>();
|
|
|
|
best_error_weights[i] = best_error_index;
|
|
|
|
// Max the error for this candidate so we don't pick it again
|
|
if (best_error_index >= 0)
|
|
{
|
|
errors_of_best_combination[best_error_index] = ERROR_CALC_DEFAULT;
|
|
}
|
|
// Early-out if no more candidates are valid
|
|
else
|
|
{
|
|
break;
|
|
}
|
|
}
|
|
|
|
for (unsigned int i = 0; i < tune_candidate_limit; i++)
|
|
{
|
|
if (best_error_weights[i] < 0)
|
|
{
|
|
return i;
|
|
}
|
|
|
|
block_mode[i] = best_error_weights[i];
|
|
|
|
quant_level[i] = static_cast<quant_method>(best_quant_levels[best_error_weights[i]]);
|
|
quant_level_mod[i] = static_cast<quant_method>(best_quant_levels_mod[best_error_weights[i]]);
|
|
|
|
assert(quant_level[i] >= QUANT_6 && quant_level[i] <= QUANT_256);
|
|
assert(quant_level_mod[i] >= QUANT_6 && quant_level_mod[i] <= QUANT_256);
|
|
|
|
for (int j = 0; j < partition_count; j++)
|
|
{
|
|
partition_format_specifiers[i][j] = best_ep_formats[best_error_weights[i]][j];
|
|
}
|
|
}
|
|
|
|
return tune_candidate_limit;
|
|
}
|
|
|
|
#endif
|