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1281 lines
43 KiB
C++
1281 lines
43 KiB
C++
/*
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* Copyright 2015 The Etc2Comp Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy 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,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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EtcBlock4x4Encoding_ETC1.cpp
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Block4x4Encoding_ETC1 is the encoder to use when targetting file format ETC1. This encoder is also
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used for the ETC1 subset of file format RGB8, RGBA8 and RGB8A1
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*/
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#include "EtcConfig.h"
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#include "EtcBlock4x4Encoding_ETC1.h"
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#include "EtcBlock4x4.h"
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#include "EtcBlock4x4EncodingBits.h"
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#include "EtcDifferentialTrys.h"
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#include <stdio.h>
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#include <string.h>
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#include <assert.h>
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#include <float.h>
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#include <limits>
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namespace Etc
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{
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// pixel processing order if the flip bit = 0 (horizontal split)
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const unsigned int Block4x4Encoding_ETC1::s_auiPixelOrderFlip0[PIXELS] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };
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// pixel processing order if the flip bit = 1 (vertical split)
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const unsigned int Block4x4Encoding_ETC1::s_auiPixelOrderFlip1[PIXELS] = { 0, 1, 4, 5, 8, 9, 12, 13, 2, 3, 6, 7, 10, 11, 14, 15 };
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// pixel processing order for horizontal scan (ETC normally does a vertical scan)
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const unsigned int Block4x4Encoding_ETC1::s_auiPixelOrderHScan[PIXELS] = { 0, 4, 8, 12, 1, 5, 9, 13, 2, 6, 10, 14, 3, 7, 11, 15 };
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// pixel indices for different block halves
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const unsigned int Block4x4Encoding_ETC1::s_auiLeftPixelMapping[8] = { 0, 1, 2, 3, 4, 5, 6, 7 };
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const unsigned int Block4x4Encoding_ETC1::s_auiRightPixelMapping[8] = { 8, 9, 10, 11, 12, 13, 14, 15 };
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const unsigned int Block4x4Encoding_ETC1::s_auiTopPixelMapping[8] = { 0, 1, 4, 5, 8, 9, 12, 13 };
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const unsigned int Block4x4Encoding_ETC1::s_auiBottomPixelMapping[8] = { 2, 3, 6, 7, 10, 11, 14, 15 };
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// CW ranges that the ETC1 decoders use
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// CW is basically a contrast for the different selector bits, since these values are offsets to the base color
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// the first axis in the array is indexed by the CW in the encoding bits
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// the second axis in the array is indexed by the selector bits
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float Block4x4Encoding_ETC1::s_aafCwTable[CW_RANGES][SELECTORS] =
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{
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{ 2.0f / 255.0f, 8.0f / 255.0f, -2.0f / 255.0f, -8.0f / 255.0f },
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{ 5.0f / 255.0f, 17.0f / 255.0f, -5.0f / 255.0f, -17.0f / 255.0f },
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{ 9.0f / 255.0f, 29.0f / 255.0f, -9.0f / 255.0f, -29.0f / 255.0f },
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{ 13.0f / 255.0f, 42.0f / 255.0f, -13.0f / 255.0f, -42.0f / 255.0f },
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{ 18.0f / 255.0f, 60.0f / 255.0f, -18.0f / 255.0f, -60.0f / 255.0f },
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{ 24.0f / 255.0f, 80.0f / 255.0f, -24.0f / 255.0f, -80.0f / 255.0f },
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{ 33.0f / 255.0f, 106.0f / 255.0f, -33.0f / 255.0f, -106.0f / 255.0f },
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{ 47.0f / 255.0f, 183.0f / 255.0f, -47.0f / 255.0f, -183.0f / 255.0f }
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};
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// ----------------------------------------------------------------------------------------------------
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//
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Block4x4Encoding_ETC1::Block4x4Encoding_ETC1(void)
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{
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m_mode = MODE_ETC1;
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m_boolDiff = false;
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m_boolFlip = false;
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m_frgbaColor1 = ColorFloatRGBA();
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m_frgbaColor2 = ColorFloatRGBA();
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m_uiCW1 = 0;
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m_uiCW2 = 0;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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m_auiSelectors[uiPixel] = 0;
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m_afDecodedAlphas[uiPixel] = 1.0f;
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}
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m_boolMostLikelyFlip = false;
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m_fError = -1.0f;
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m_fError1 = -1.0f;
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m_fError2 = -1.0f;
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m_boolSeverelyBentDifferentialColors = false;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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m_afDecodedAlphas[uiPixel] = 1.0f;
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}
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}
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Block4x4Encoding_ETC1::~Block4x4Encoding_ETC1(void) {}
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// ----------------------------------------------------------------------------------------------------
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// initialization prior to encoding
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// a_pblockParent points to the block associated with this encoding
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// a_errormetric is used to choose the best encoding
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// a_pafrgbaSource points to a 4x4 block subset of the source image
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// a_paucEncodingBits points to the final encoding bits
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//
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void Block4x4Encoding_ETC1::InitFromSource(Block4x4 *a_pblockParent,
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ColorFloatRGBA *a_pafrgbaSource,
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unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
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{
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Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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m_afDecodedAlphas[uiPixel] = 1.0f;
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}
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m_fError = -1.0f;
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m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)(a_paucEncodingBits);
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}
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// ----------------------------------------------------------------------------------------------------
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// initialization from the encoding bits of a previous encoding
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// a_pblockParent points to the block associated with this encoding
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// a_errormetric is used to choose the best encoding
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// a_pafrgbaSource points to a 4x4 block subset of the source image
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// a_paucEncodingBits points to the final encoding bits of a previous encoding
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//
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void Block4x4Encoding_ETC1::InitFromEncodingBits(Block4x4 *a_pblockParent,
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unsigned char *a_paucEncodingBits,
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ColorFloatRGBA *a_pafrgbaSource,
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ErrorMetric a_errormetric)
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{
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Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
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m_fError = -1.0f;
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m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)a_paucEncodingBits;
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m_mode = MODE_ETC1;
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m_boolDiff = m_pencodingbitsRGB8->individual.diff;
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m_boolFlip = m_pencodingbitsRGB8->individual.flip;
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if (m_boolDiff)
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{
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int iR2 = (int)(m_pencodingbitsRGB8->differential.red1 + m_pencodingbitsRGB8->differential.dred2);
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if (iR2 < 0)
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{
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iR2 = 0;
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}
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else if (iR2 > 31)
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{
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iR2 = 31;
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}
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int iG2 = (int)(m_pencodingbitsRGB8->differential.green1 + m_pencodingbitsRGB8->differential.dgreen2);
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if (iG2 < 0)
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{
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iG2 = 0;
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}
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else if (iG2 > 31)
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{
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iG2 = 31;
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}
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int iB2 = (int)(m_pencodingbitsRGB8->differential.blue1 + m_pencodingbitsRGB8->differential.dblue2);
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if (iB2 < 0)
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{
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iB2 = 0;
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}
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else if (iB2 > 31)
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{
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iB2 = 31;
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}
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m_frgbaColor1 = ColorFloatRGBA::ConvertFromRGB5(m_pencodingbitsRGB8->differential.red1, m_pencodingbitsRGB8->differential.green1, m_pencodingbitsRGB8->differential.blue1);
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m_frgbaColor2 = ColorFloatRGBA::ConvertFromRGB5((unsigned char)iR2, (unsigned char)iG2, (unsigned char)iB2);
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}
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else
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{
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m_frgbaColor1 = ColorFloatRGBA::ConvertFromRGB4(m_pencodingbitsRGB8->individual.red1, m_pencodingbitsRGB8->individual.green1, m_pencodingbitsRGB8->individual.blue1);
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m_frgbaColor2 = ColorFloatRGBA::ConvertFromRGB4(m_pencodingbitsRGB8->individual.red2, m_pencodingbitsRGB8->individual.green2, m_pencodingbitsRGB8->individual.blue2);
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}
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m_uiCW1 = m_pencodingbitsRGB8->individual.cw1;
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m_uiCW2 = m_pencodingbitsRGB8->individual.cw2;
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InitFromEncodingBits_Selectors();
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Decode();
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CalcBlockError();
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}
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// ----------------------------------------------------------------------------------------------------
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// init the selectors from a prior encoding
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//
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void Block4x4Encoding_ETC1::InitFromEncodingBits_Selectors(void)
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{
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unsigned char *paucSelectors = (unsigned char *)&m_pencodingbitsRGB8->individual.selectors;
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for (unsigned int iPixel = 0; iPixel < PIXELS; iPixel++)
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{
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unsigned int uiByteMSB = (unsigned int)(1 - (iPixel / 8));
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unsigned int uiByteLSB = (unsigned int)(3 - (iPixel / 8));
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unsigned int uiShift = (unsigned int)(iPixel & 7);
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unsigned int uiSelectorMSB = (unsigned int)((paucSelectors[uiByteMSB] >> uiShift) & 1);
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unsigned int uiSelectorLSB = (unsigned int)((paucSelectors[uiByteLSB] >> uiShift) & 1);
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m_auiSelectors[iPixel] = (uiSelectorMSB << 1) + uiSelectorLSB;
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}
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}
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// ----------------------------------------------------------------------------------------------------
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// perform a single encoding iteration
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// replace the encoding if a better encoding was found
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// subsequent iterations generally take longer for each iteration
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// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
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//
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void Block4x4Encoding_ETC1::PerformIteration(float a_fEffort)
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{
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assert(!m_boolDone);
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switch (m_uiEncodingIterations)
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{
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case 0:
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PerformFirstIteration();
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break;
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case 1:
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TryDifferential(m_boolMostLikelyFlip, 1, 0, 0);
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break;
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case 2:
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TryIndividual(m_boolMostLikelyFlip, 1);
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if (a_fEffort <= 49.5f)
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{
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m_boolDone = true;
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}
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break;
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case 3:
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TryDifferential(!m_boolMostLikelyFlip, 1, 0, 0);
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if (a_fEffort <= 59.5f)
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{
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m_boolDone = true;
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}
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break;
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case 4:
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TryIndividual(!m_boolMostLikelyFlip, 1);
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if (a_fEffort <= 69.5f)
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{
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m_boolDone = true;
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}
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break;
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case 5:
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TryDegenerates1();
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if (a_fEffort <= 79.5f)
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{
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m_boolDone = true;
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}
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break;
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case 6:
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TryDegenerates2();
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if (a_fEffort <= 89.5f)
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{
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m_boolDone = true;
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}
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break;
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case 7:
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TryDegenerates3();
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if (a_fEffort <= 99.5f)
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{
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m_boolDone = true;
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}
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break;
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case 8:
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TryDegenerates4();
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m_boolDone = true;
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break;
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default:
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assert(0);
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break;
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}
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m_uiEncodingIterations++;
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SetDoneIfPerfect();
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}
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// ----------------------------------------------------------------------------------------------------
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// find best initial encoding to ensure block has a valid encoding
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//
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void Block4x4Encoding_ETC1::PerformFirstIteration(void)
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{
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CalculateMostLikelyFlip();
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m_fError = FLT_MAX;
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TryDifferential(m_boolMostLikelyFlip, 0, 0, 0);
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SetDoneIfPerfect();
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if (m_boolDone)
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{
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return;
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}
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TryIndividual(m_boolMostLikelyFlip, 0);
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SetDoneIfPerfect();
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if (m_boolDone)
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{
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return;
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}
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TryDifferential(!m_boolMostLikelyFlip, 0, 0, 0);
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SetDoneIfPerfect();
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if (m_boolDone)
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{
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return;
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}
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TryIndividual(!m_boolMostLikelyFlip, 0);
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}
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// ----------------------------------------------------------------------------------------------------
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// algorithm:
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// create a source average color for the Left, Right, Top and Bottom halves using the 8 pixels in each half
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// note: the "gray line" is the line of equal delta RGB that goes thru the average color
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// for each half:
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// see how close each of the 8 pixels are to the "gray line" that goes thru the source average color
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// create an error value that is the sum of the distances from the gray line
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// h_error is the sum of Left and Right errors
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// v_error is the sum of Top and Bottom errors
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//
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void Block4x4Encoding_ETC1::CalculateMostLikelyFlip(void)
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{
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static const bool DEBUG_PRINT = false;
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CalculateSourceAverages();
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float fLeftGrayErrorSum = 0.0f;
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float fRightGrayErrorSum = 0.0f;
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float fTopGrayErrorSum = 0.0f;
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float fBottomGrayErrorSum = 0.0f;
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for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
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{
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ColorFloatRGBA *pfrgbaLeft = &m_pafrgbaSource[uiPixel];
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ColorFloatRGBA *pfrgbaRight = &m_pafrgbaSource[uiPixel + 8];
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ColorFloatRGBA *pfrgbaTop = &m_pafrgbaSource[s_auiTopPixelMapping[uiPixel]];
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ColorFloatRGBA *pfrgbaBottom = &m_pafrgbaSource[s_auiBottomPixelMapping[uiPixel]];
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float fLeftGrayError = CalcGrayDistance2(*pfrgbaLeft, m_frgbaSourceAverageLeft);
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float fRightGrayError = CalcGrayDistance2(*pfrgbaRight, m_frgbaSourceAverageRight);
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float fTopGrayError = CalcGrayDistance2(*pfrgbaTop, m_frgbaSourceAverageTop);
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float fBottomGrayError = CalcGrayDistance2(*pfrgbaBottom, m_frgbaSourceAverageBottom);
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fLeftGrayErrorSum += fLeftGrayError;
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fRightGrayErrorSum += fRightGrayError;
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fTopGrayErrorSum += fTopGrayError;
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fBottomGrayErrorSum += fBottomGrayError;
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}
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if (DEBUG_PRINT)
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{
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printf("\n%.2f %.2f\n", fLeftGrayErrorSum + fRightGrayErrorSum, fTopGrayErrorSum + fBottomGrayErrorSum);
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}
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m_boolMostLikelyFlip = (fTopGrayErrorSum + fBottomGrayErrorSum) < (fLeftGrayErrorSum + fRightGrayErrorSum);
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}
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// ----------------------------------------------------------------------------------------------------
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// calculate source pixel averages for each 2x2 quadrant in a 4x4 block
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// these are used to determine the averages for each of the 4 different halves (left, right, top, bottom)
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// ignore pixels that have alpha == NAN (these are border pixels outside of the source image)
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// weight the averages based on a pixel's alpha
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//
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void Block4x4Encoding_ETC1::CalculateSourceAverages(void)
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{
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static const bool DEBUG_PRINT = false;
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if (m_pblockParent->GetSourceAlphaMix() == Block4x4::SourceAlphaMix::OPAQUE)
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{
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ColorFloatRGBA frgbaSumUL = m_pafrgbaSource[0] + m_pafrgbaSource[1] + m_pafrgbaSource[4] + m_pafrgbaSource[5];
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ColorFloatRGBA frgbaSumLL = m_pafrgbaSource[2] + m_pafrgbaSource[3] + m_pafrgbaSource[6] + m_pafrgbaSource[7];
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ColorFloatRGBA frgbaSumUR = m_pafrgbaSource[8] + m_pafrgbaSource[9] + m_pafrgbaSource[12] + m_pafrgbaSource[13];
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ColorFloatRGBA frgbaSumLR = m_pafrgbaSource[10] + m_pafrgbaSource[11] + m_pafrgbaSource[14] + m_pafrgbaSource[15];
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m_frgbaSourceAverageLeft = (frgbaSumUL + frgbaSumLL) * 0.125f;
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m_frgbaSourceAverageRight = (frgbaSumUR + frgbaSumLR) * 0.125f;
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m_frgbaSourceAverageTop = (frgbaSumUL + frgbaSumUR) * 0.125f;
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m_frgbaSourceAverageBottom = (frgbaSumLL + frgbaSumLR) * 0.125f;
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}
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else
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{
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float afSourceAlpha[PIXELS];
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// treat alpha NAN as 0.0f
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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afSourceAlpha[uiPixel] = isnan(m_pafrgbaSource[uiPixel].fA) ?
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0.0f :
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m_pafrgbaSource[uiPixel].fA;
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}
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ColorFloatRGBA afrgbaAlphaWeightedSource[PIXELS];
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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afrgbaAlphaWeightedSource[uiPixel] = m_pafrgbaSource[uiPixel] * afSourceAlpha[uiPixel];
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}
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ColorFloatRGBA frgbaSumUL = afrgbaAlphaWeightedSource[0] +
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afrgbaAlphaWeightedSource[1] +
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afrgbaAlphaWeightedSource[4] +
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afrgbaAlphaWeightedSource[5];
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ColorFloatRGBA frgbaSumLL = afrgbaAlphaWeightedSource[2] +
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afrgbaAlphaWeightedSource[3] +
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afrgbaAlphaWeightedSource[6] +
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afrgbaAlphaWeightedSource[7];
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ColorFloatRGBA frgbaSumUR = afrgbaAlphaWeightedSource[8] +
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afrgbaAlphaWeightedSource[9] +
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afrgbaAlphaWeightedSource[12] +
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afrgbaAlphaWeightedSource[13];
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ColorFloatRGBA frgbaSumLR = afrgbaAlphaWeightedSource[10] +
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afrgbaAlphaWeightedSource[11] +
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afrgbaAlphaWeightedSource[14] +
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afrgbaAlphaWeightedSource[15];
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float fWeightSumUL = afSourceAlpha[0] +
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afSourceAlpha[1] +
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afSourceAlpha[4] +
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afSourceAlpha[5];
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float fWeightSumLL = afSourceAlpha[2] +
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afSourceAlpha[3] +
|
|
afSourceAlpha[6] +
|
|
afSourceAlpha[7];
|
|
|
|
float fWeightSumUR = afSourceAlpha[8] +
|
|
afSourceAlpha[9] +
|
|
afSourceAlpha[12] +
|
|
afSourceAlpha[13];
|
|
|
|
float fWeightSumLR = afSourceAlpha[10] +
|
|
afSourceAlpha[11] +
|
|
afSourceAlpha[14] +
|
|
afSourceAlpha[15];
|
|
|
|
ColorFloatRGBA frgbaSumLeft = frgbaSumUL + frgbaSumLL;
|
|
ColorFloatRGBA frgbaSumRight = frgbaSumUR + frgbaSumLR;
|
|
ColorFloatRGBA frgbaSumTop = frgbaSumUL + frgbaSumUR;
|
|
ColorFloatRGBA frgbaSumBottom = frgbaSumLL + frgbaSumLR;
|
|
|
|
float fWeightSumLeft = fWeightSumUL + fWeightSumLL;
|
|
float fWeightSumRight = fWeightSumUR + fWeightSumLR;
|
|
float fWeightSumTop = fWeightSumUL + fWeightSumUR;
|
|
float fWeightSumBottom = fWeightSumLL + fWeightSumLR;
|
|
|
|
// check to see if there is at least 1 pixel with non-zero alpha
|
|
// completely transparent block should not make it to this code
|
|
assert((fWeightSumLeft + fWeightSumRight) > 0.0f);
|
|
assert((fWeightSumTop + fWeightSumBottom) > 0.0f);
|
|
|
|
if (fWeightSumLeft > 0.0f)
|
|
{
|
|
m_frgbaSourceAverageLeft = frgbaSumLeft * (1.0f/fWeightSumLeft);
|
|
}
|
|
if (fWeightSumRight > 0.0f)
|
|
{
|
|
m_frgbaSourceAverageRight = frgbaSumRight * (1.0f/fWeightSumRight);
|
|
}
|
|
if (fWeightSumTop > 0.0f)
|
|
{
|
|
m_frgbaSourceAverageTop = frgbaSumTop * (1.0f/fWeightSumTop);
|
|
}
|
|
if (fWeightSumBottom > 0.0f)
|
|
{
|
|
m_frgbaSourceAverageBottom = frgbaSumBottom * (1.0f/fWeightSumBottom);
|
|
}
|
|
|
|
if (fWeightSumLeft == 0.0f)
|
|
{
|
|
assert(fWeightSumRight > 0.0f);
|
|
m_frgbaSourceAverageLeft = m_frgbaSourceAverageRight;
|
|
}
|
|
if (fWeightSumRight == 0.0f)
|
|
{
|
|
assert(fWeightSumLeft > 0.0f);
|
|
m_frgbaSourceAverageRight = m_frgbaSourceAverageLeft;
|
|
}
|
|
if (fWeightSumTop == 0.0f)
|
|
{
|
|
assert(fWeightSumBottom > 0.0f);
|
|
m_frgbaSourceAverageTop = m_frgbaSourceAverageBottom;
|
|
}
|
|
if (fWeightSumBottom == 0.0f)
|
|
{
|
|
assert(fWeightSumTop > 0.0f);
|
|
m_frgbaSourceAverageBottom = m_frgbaSourceAverageTop;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
if (DEBUG_PRINT)
|
|
{
|
|
printf("\ntarget: [%.2f,%.2f,%.2f] [%.2f,%.2f,%.2f] [%.2f,%.2f,%.2f] [%.2f,%.2f,%.2f]\n",
|
|
m_frgbaSourceAverageLeft.fR, m_frgbaSourceAverageLeft.fG, m_frgbaSourceAverageLeft.fB,
|
|
m_frgbaSourceAverageRight.fR, m_frgbaSourceAverageRight.fG, m_frgbaSourceAverageRight.fB,
|
|
m_frgbaSourceAverageTop.fR, m_frgbaSourceAverageTop.fG, m_frgbaSourceAverageTop.fB,
|
|
m_frgbaSourceAverageBottom.fR, m_frgbaSourceAverageBottom.fG, m_frgbaSourceAverageBottom.fB);
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try an ETC1 differential mode encoding
|
|
// use a_boolFlip to set the encoding F bit
|
|
// use a_uiRadius to alter basecolor components in the range[-a_uiRadius:a_uiRadius]
|
|
// use a_iGrayOffset1 and a_iGrayOffset2 to offset the basecolor to search for degenerate encodings
|
|
// replace the encoding if the encoding error is less than previous encoding
|
|
//
|
|
void Block4x4Encoding_ETC1::TryDifferential(bool a_boolFlip, unsigned int a_uiRadius,
|
|
int a_iGrayOffset1, int a_iGrayOffset2)
|
|
{
|
|
|
|
ColorFloatRGBA frgbaColor1;
|
|
ColorFloatRGBA frgbaColor2;
|
|
|
|
const unsigned int *pauiPixelMapping1;
|
|
const unsigned int *pauiPixelMapping2;
|
|
|
|
if (a_boolFlip)
|
|
{
|
|
frgbaColor1 = m_frgbaSourceAverageTop;
|
|
frgbaColor2 = m_frgbaSourceAverageBottom;
|
|
|
|
pauiPixelMapping1 = s_auiTopPixelMapping;
|
|
pauiPixelMapping2 = s_auiBottomPixelMapping;
|
|
}
|
|
else
|
|
{
|
|
frgbaColor1 = m_frgbaSourceAverageLeft;
|
|
frgbaColor2 = m_frgbaSourceAverageRight;
|
|
|
|
pauiPixelMapping1 = s_auiLeftPixelMapping;
|
|
pauiPixelMapping2 = s_auiRightPixelMapping;
|
|
}
|
|
|
|
DifferentialTrys trys(frgbaColor1, frgbaColor2, pauiPixelMapping1, pauiPixelMapping2,
|
|
a_uiRadius, a_iGrayOffset1, a_iGrayOffset2);
|
|
|
|
Block4x4Encoding_ETC1 encodingTry = *this;
|
|
encodingTry.m_boolFlip = a_boolFlip;
|
|
|
|
encodingTry.TryDifferentialHalf(&trys.m_half1);
|
|
encodingTry.TryDifferentialHalf(&trys.m_half2);
|
|
|
|
// find best halves that are within differential range
|
|
DifferentialTrys::Try *ptryBest1 = nullptr;
|
|
DifferentialTrys::Try *ptryBest2 = nullptr;
|
|
encodingTry.m_fError = FLT_MAX;
|
|
|
|
// see if the best of each half are in differential range
|
|
int iDRed = trys.m_half2.m_ptryBest->m_iRed - trys.m_half1.m_ptryBest->m_iRed;
|
|
int iDGreen = trys.m_half2.m_ptryBest->m_iGreen - trys.m_half1.m_ptryBest->m_iGreen;
|
|
int iDBlue = trys.m_half2.m_ptryBest->m_iBlue - trys.m_half1.m_ptryBest->m_iBlue;
|
|
if (iDRed >= -4 && iDRed <= 3 && iDGreen >= -4 && iDGreen <= 3 && iDBlue >= -4 && iDBlue <= 3)
|
|
{
|
|
ptryBest1 = trys.m_half1.m_ptryBest;
|
|
ptryBest2 = trys.m_half2.m_ptryBest;
|
|
encodingTry.m_fError = trys.m_half1.m_ptryBest->m_fError + trys.m_half2.m_ptryBest->m_fError;
|
|
}
|
|
else
|
|
{
|
|
// else, find the next best halves that are in differential range
|
|
for (DifferentialTrys::Try *ptry1 = &trys.m_half1.m_atry[0];
|
|
ptry1 < &trys.m_half1.m_atry[trys.m_half1.m_uiTrys];
|
|
ptry1++)
|
|
{
|
|
for (DifferentialTrys::Try *ptry2 = &trys.m_half2.m_atry[0];
|
|
ptry2 < &trys.m_half2.m_atry[trys.m_half2.m_uiTrys];
|
|
ptry2++)
|
|
{
|
|
iDRed = ptry2->m_iRed - ptry1->m_iRed;
|
|
bool boolValidRedDelta = iDRed <= 3 && iDRed >= -4;
|
|
iDGreen = ptry2->m_iGreen - ptry1->m_iGreen;
|
|
bool boolValidGreenDelta = iDGreen <= 3 && iDGreen >= -4;
|
|
iDBlue = ptry2->m_iBlue - ptry1->m_iBlue;
|
|
bool boolValidBlueDelta = iDBlue <= 3 && iDBlue >= -4;
|
|
|
|
if (boolValidRedDelta && boolValidGreenDelta && boolValidBlueDelta)
|
|
{
|
|
float fError = ptry1->m_fError + ptry2->m_fError;
|
|
|
|
if (fError < encodingTry.m_fError)
|
|
{
|
|
encodingTry.m_fError = fError;
|
|
|
|
ptryBest1 = ptry1;
|
|
ptryBest2 = ptry2;
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
assert(encodingTry.m_fError < FLT_MAX);
|
|
assert(ptryBest1 != nullptr);
|
|
assert(ptryBest2 != nullptr);
|
|
}
|
|
|
|
if (encodingTry.m_fError < m_fError)
|
|
{
|
|
m_mode = MODE_ETC1;
|
|
m_boolDiff = true;
|
|
m_boolFlip = encodingTry.m_boolFlip;
|
|
m_frgbaColor1 = ColorFloatRGBA::ConvertFromRGB5((unsigned char)ptryBest1->m_iRed, (unsigned char)ptryBest1->m_iGreen, (unsigned char)ptryBest1->m_iBlue);
|
|
m_frgbaColor2 = ColorFloatRGBA::ConvertFromRGB5((unsigned char)ptryBest2->m_iRed, (unsigned char)ptryBest2->m_iGreen, (unsigned char)ptryBest2->m_iBlue);
|
|
m_uiCW1 = ptryBest1->m_uiCW;
|
|
m_uiCW2 = ptryBest2->m_uiCW;
|
|
|
|
for (unsigned int uiPixelOrder = 0; uiPixelOrder < PIXELS / 2; uiPixelOrder++)
|
|
{
|
|
unsigned int uiPixel1 = pauiPixelMapping1[uiPixelOrder];
|
|
unsigned int uiPixel2 = pauiPixelMapping2[uiPixelOrder];
|
|
|
|
unsigned int uiSelector1 = ptryBest1->m_auiSelectors[uiPixelOrder];
|
|
unsigned int uiSelector2 = ptryBest2->m_auiSelectors[uiPixelOrder];
|
|
|
|
m_auiSelectors[uiPixel1] = uiSelector1;
|
|
m_auiSelectors[uiPixel2] = ptryBest2->m_auiSelectors[uiPixelOrder];
|
|
|
|
float fDeltaRGB1 = s_aafCwTable[m_uiCW1][uiSelector1];
|
|
float fDeltaRGB2 = s_aafCwTable[m_uiCW2][uiSelector2];
|
|
|
|
m_afrgbaDecodedColors[uiPixel1] = (m_frgbaColor1 + fDeltaRGB1).ClampRGB();
|
|
m_afrgbaDecodedColors[uiPixel2] = (m_frgbaColor2 + fDeltaRGB2).ClampRGB();
|
|
}
|
|
|
|
m_fError1 = ptryBest1->m_fError;
|
|
m_fError2 = ptryBest2->m_fError;
|
|
m_boolSeverelyBentDifferentialColors = trys.m_boolSeverelyBentColors;
|
|
m_fError = m_fError1 + m_fError2;
|
|
|
|
// sanity check
|
|
{
|
|
int iRed1 = m_frgbaColor1.IntRed(31.0f);
|
|
int iGreen1 = m_frgbaColor1.IntGreen(31.0f);
|
|
int iBlue1 = m_frgbaColor1.IntBlue(31.0f);
|
|
|
|
int iRed2 = m_frgbaColor2.IntRed(31.0f);
|
|
int iGreen2 = m_frgbaColor2.IntGreen(31.0f);
|
|
int iBlue2 = m_frgbaColor2.IntBlue(31.0f);
|
|
|
|
iDRed = iRed2 - iRed1;
|
|
iDGreen = iGreen2 - iGreen1;
|
|
iDBlue = iBlue2 - iBlue1;
|
|
|
|
assert(iDRed >= -4 && iDRed < 4);
|
|
assert(iDGreen >= -4 && iDGreen < 4);
|
|
assert(iDBlue >= -4 && iDBlue < 4);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try an ETC1 differential mode encoding for a half of a 4x4 block
|
|
// vary the basecolor components using a radius
|
|
//
|
|
void Block4x4Encoding_ETC1::TryDifferentialHalf(DifferentialTrys::Half *a_phalf)
|
|
{
|
|
|
|
a_phalf->m_ptryBest = nullptr;
|
|
float fBestTryError = FLT_MAX;
|
|
|
|
a_phalf->m_uiTrys = 0;
|
|
for (int iRed = a_phalf->m_iRed - (int)a_phalf->m_uiRadius;
|
|
iRed <= a_phalf->m_iRed + (int)a_phalf->m_uiRadius;
|
|
iRed++)
|
|
{
|
|
assert(iRed >= 0 && iRed <= 31);
|
|
|
|
for (int iGreen = a_phalf->m_iGreen - (int)a_phalf->m_uiRadius;
|
|
iGreen <= a_phalf->m_iGreen + (int)a_phalf->m_uiRadius;
|
|
iGreen++)
|
|
{
|
|
assert(iGreen >= 0 && iGreen <= 31);
|
|
|
|
for (int iBlue = a_phalf->m_iBlue - (int)a_phalf->m_uiRadius;
|
|
iBlue <= a_phalf->m_iBlue + (int)a_phalf->m_uiRadius;
|
|
iBlue++)
|
|
{
|
|
assert(iBlue >= 0 && iBlue <= 31);
|
|
|
|
DifferentialTrys::Try *ptry = &a_phalf->m_atry[a_phalf->m_uiTrys];
|
|
assert(ptry < &a_phalf->m_atry[DifferentialTrys::Half::MAX_TRYS]);
|
|
|
|
ptry->m_iRed = iRed;
|
|
ptry->m_iGreen = iGreen;
|
|
ptry->m_iBlue = iBlue;
|
|
ptry->m_fError = FLT_MAX;
|
|
ColorFloatRGBA frgbaColor = ColorFloatRGBA::ConvertFromRGB5((unsigned char)iRed, (unsigned char)iGreen, (unsigned char)iBlue);
|
|
|
|
// try each CW
|
|
for (unsigned int uiCW = 0; uiCW < CW_RANGES; uiCW++)
|
|
{
|
|
unsigned int auiPixelSelectors[PIXELS / 2];
|
|
ColorFloatRGBA afrgbaDecodedPixels[PIXELS / 2];
|
|
float afPixelErrors[PIXELS / 2] = { FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX,
|
|
FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX };
|
|
|
|
// pre-compute decoded pixels for each selector
|
|
ColorFloatRGBA afrgbaSelectors[SELECTORS];
|
|
assert(SELECTORS == 4);
|
|
afrgbaSelectors[0] = (frgbaColor + s_aafCwTable[uiCW][0]).ClampRGB();
|
|
afrgbaSelectors[1] = (frgbaColor + s_aafCwTable[uiCW][1]).ClampRGB();
|
|
afrgbaSelectors[2] = (frgbaColor + s_aafCwTable[uiCW][2]).ClampRGB();
|
|
afrgbaSelectors[3] = (frgbaColor + s_aafCwTable[uiCW][3]).ClampRGB();
|
|
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
ColorFloatRGBA *pfrgbaSourcePixel = &m_pafrgbaSource[a_phalf->m_pauiPixelMapping[uiPixel]];
|
|
ColorFloatRGBA frgbaDecodedPixel;
|
|
|
|
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
|
|
{
|
|
frgbaDecodedPixel = afrgbaSelectors[uiSelector];
|
|
|
|
float fPixelError;
|
|
|
|
fPixelError = CalcPixelError(frgbaDecodedPixel, m_afDecodedAlphas[a_phalf->m_pauiPixelMapping[uiPixel]],
|
|
*pfrgbaSourcePixel);
|
|
|
|
if (fPixelError < afPixelErrors[uiPixel])
|
|
{
|
|
auiPixelSelectors[uiPixel] = uiSelector;
|
|
afrgbaDecodedPixels[uiPixel] = frgbaDecodedPixel;
|
|
afPixelErrors[uiPixel] = fPixelError;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
// add up all pixel errors
|
|
float fCWError = 0.0f;
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
fCWError += afPixelErrors[uiPixel];
|
|
}
|
|
|
|
// if best CW so far
|
|
if (fCWError < ptry->m_fError)
|
|
{
|
|
ptry->m_uiCW = uiCW;
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
ptry->m_auiSelectors[uiPixel] = auiPixelSelectors[uiPixel];
|
|
}
|
|
ptry->m_fError = fCWError;
|
|
}
|
|
|
|
}
|
|
|
|
if (ptry->m_fError < fBestTryError)
|
|
{
|
|
a_phalf->m_ptryBest = ptry;
|
|
fBestTryError = ptry->m_fError;
|
|
}
|
|
|
|
assert(ptry->m_fError < FLT_MAX);
|
|
|
|
a_phalf->m_uiTrys++;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try an ETC1 individual mode encoding
|
|
// use a_boolFlip to set the encoding F bit
|
|
// use a_uiRadius to alter basecolor components in the range[-a_uiRadius:a_uiRadius]
|
|
// replace the encoding if the encoding error is less than previous encoding
|
|
//
|
|
void Block4x4Encoding_ETC1::TryIndividual(bool a_boolFlip, unsigned int a_uiRadius)
|
|
{
|
|
|
|
ColorFloatRGBA frgbaColor1;
|
|
ColorFloatRGBA frgbaColor2;
|
|
|
|
const unsigned int *pauiPixelMapping1;
|
|
const unsigned int *pauiPixelMapping2;
|
|
|
|
if (a_boolFlip)
|
|
{
|
|
frgbaColor1 = m_frgbaSourceAverageTop;
|
|
frgbaColor2 = m_frgbaSourceAverageBottom;
|
|
|
|
pauiPixelMapping1 = s_auiTopPixelMapping;
|
|
pauiPixelMapping2 = s_auiBottomPixelMapping;
|
|
}
|
|
else
|
|
{
|
|
frgbaColor1 = m_frgbaSourceAverageLeft;
|
|
frgbaColor2 = m_frgbaSourceAverageRight;
|
|
|
|
pauiPixelMapping1 = s_auiLeftPixelMapping;
|
|
pauiPixelMapping2 = s_auiRightPixelMapping;
|
|
}
|
|
|
|
IndividualTrys trys(frgbaColor1, frgbaColor2, pauiPixelMapping1, pauiPixelMapping2, a_uiRadius);
|
|
|
|
Block4x4Encoding_ETC1 encodingTry = *this;
|
|
encodingTry.m_boolFlip = a_boolFlip;
|
|
|
|
encodingTry.TryIndividualHalf(&trys.m_half1);
|
|
encodingTry.TryIndividualHalf(&trys.m_half2);
|
|
|
|
// use the best of each half
|
|
IndividualTrys::Try *ptryBest1 = trys.m_half1.m_ptryBest;
|
|
IndividualTrys::Try *ptryBest2 = trys.m_half2.m_ptryBest;
|
|
encodingTry.m_fError = trys.m_half1.m_ptryBest->m_fError + trys.m_half2.m_ptryBest->m_fError;
|
|
|
|
if (encodingTry.m_fError < m_fError)
|
|
{
|
|
m_mode = MODE_ETC1;
|
|
m_boolDiff = false;
|
|
m_boolFlip = encodingTry.m_boolFlip;
|
|
m_frgbaColor1 = ColorFloatRGBA::ConvertFromRGB4((unsigned char)ptryBest1->m_iRed, (unsigned char)ptryBest1->m_iGreen, (unsigned char)ptryBest1->m_iBlue);
|
|
m_frgbaColor2 = ColorFloatRGBA::ConvertFromRGB4((unsigned char)ptryBest2->m_iRed, (unsigned char)ptryBest2->m_iGreen, (unsigned char)ptryBest2->m_iBlue);
|
|
m_uiCW1 = ptryBest1->m_uiCW;
|
|
m_uiCW2 = ptryBest2->m_uiCW;
|
|
|
|
for (unsigned int uiPixelOrder = 0; uiPixelOrder < PIXELS / 2; uiPixelOrder++)
|
|
{
|
|
unsigned int uiPixel1 = pauiPixelMapping1[uiPixelOrder];
|
|
unsigned int uiPixel2 = pauiPixelMapping2[uiPixelOrder];
|
|
|
|
unsigned int uiSelector1 = ptryBest1->m_auiSelectors[uiPixelOrder];
|
|
unsigned int uiSelector2 = ptryBest2->m_auiSelectors[uiPixelOrder];
|
|
|
|
m_auiSelectors[uiPixel1] = uiSelector1;
|
|
m_auiSelectors[uiPixel2] = ptryBest2->m_auiSelectors[uiPixelOrder];
|
|
|
|
float fDeltaRGB1 = s_aafCwTable[m_uiCW1][uiSelector1];
|
|
float fDeltaRGB2 = s_aafCwTable[m_uiCW2][uiSelector2];
|
|
|
|
m_afrgbaDecodedColors[uiPixel1] = (m_frgbaColor1 + fDeltaRGB1).ClampRGB();
|
|
m_afrgbaDecodedColors[uiPixel2] = (m_frgbaColor2 + fDeltaRGB2).ClampRGB();
|
|
}
|
|
|
|
m_fError1 = ptryBest1->m_fError;
|
|
m_fError2 = ptryBest2->m_fError;
|
|
m_fError = m_fError1 + m_fError2;
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try an ETC1 differential mode encoding for a half of a 4x4 block
|
|
// vary the basecolor components using a radius
|
|
//
|
|
void Block4x4Encoding_ETC1::TryIndividualHalf(IndividualTrys::Half *a_phalf)
|
|
{
|
|
|
|
a_phalf->m_ptryBest = nullptr;
|
|
float fBestTryError = FLT_MAX;
|
|
|
|
a_phalf->m_uiTrys = 0;
|
|
for (int iRed = a_phalf->m_iRed - (int)a_phalf->m_uiRadius;
|
|
iRed <= a_phalf->m_iRed + (int)a_phalf->m_uiRadius;
|
|
iRed++)
|
|
{
|
|
assert(iRed >= 0 && iRed <= 15);
|
|
|
|
for (int iGreen = a_phalf->m_iGreen - (int)a_phalf->m_uiRadius;
|
|
iGreen <= a_phalf->m_iGreen + (int)a_phalf->m_uiRadius;
|
|
iGreen++)
|
|
{
|
|
assert(iGreen >= 0 && iGreen <= 15);
|
|
|
|
for (int iBlue = a_phalf->m_iBlue - (int)a_phalf->m_uiRadius;
|
|
iBlue <= a_phalf->m_iBlue + (int)a_phalf->m_uiRadius;
|
|
iBlue++)
|
|
{
|
|
assert(iBlue >= 0 && iBlue <= 15);
|
|
|
|
IndividualTrys::Try *ptry = &a_phalf->m_atry[a_phalf->m_uiTrys];
|
|
assert(ptry < &a_phalf->m_atry[IndividualTrys::Half::MAX_TRYS]);
|
|
|
|
ptry->m_iRed = iRed;
|
|
ptry->m_iGreen = iGreen;
|
|
ptry->m_iBlue = iBlue;
|
|
ptry->m_fError = FLT_MAX;
|
|
ColorFloatRGBA frgbaColor = ColorFloatRGBA::ConvertFromRGB4((unsigned char)iRed, (unsigned char)iGreen, (unsigned char)iBlue);
|
|
|
|
// try each CW
|
|
for (unsigned int uiCW = 0; uiCW < CW_RANGES; uiCW++)
|
|
{
|
|
unsigned int auiPixelSelectors[PIXELS / 2];
|
|
ColorFloatRGBA afrgbaDecodedPixels[PIXELS / 2];
|
|
float afPixelErrors[PIXELS / 2] = { FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX,
|
|
FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX };
|
|
|
|
// pre-compute decoded pixels for each selector
|
|
ColorFloatRGBA afrgbaSelectors[SELECTORS];
|
|
assert(SELECTORS == 4);
|
|
afrgbaSelectors[0] = (frgbaColor + s_aafCwTable[uiCW][0]).ClampRGB();
|
|
afrgbaSelectors[1] = (frgbaColor + s_aafCwTable[uiCW][1]).ClampRGB();
|
|
afrgbaSelectors[2] = (frgbaColor + s_aafCwTable[uiCW][2]).ClampRGB();
|
|
afrgbaSelectors[3] = (frgbaColor + s_aafCwTable[uiCW][3]).ClampRGB();
|
|
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
ColorFloatRGBA *pfrgbaSourcePixel = &m_pafrgbaSource[a_phalf->m_pauiPixelMapping[uiPixel]];
|
|
ColorFloatRGBA frgbaDecodedPixel;
|
|
|
|
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
|
|
{
|
|
frgbaDecodedPixel = afrgbaSelectors[uiSelector];
|
|
|
|
float fPixelError;
|
|
|
|
fPixelError = CalcPixelError(frgbaDecodedPixel, m_afDecodedAlphas[a_phalf->m_pauiPixelMapping[uiPixel]],
|
|
*pfrgbaSourcePixel);
|
|
|
|
if (fPixelError < afPixelErrors[uiPixel])
|
|
{
|
|
auiPixelSelectors[uiPixel] = uiSelector;
|
|
afrgbaDecodedPixels[uiPixel] = frgbaDecodedPixel;
|
|
afPixelErrors[uiPixel] = fPixelError;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
// add up all pixel errors
|
|
float fCWError = 0.0f;
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
fCWError += afPixelErrors[uiPixel];
|
|
}
|
|
|
|
// if best CW so far
|
|
if (fCWError < ptry->m_fError)
|
|
{
|
|
ptry->m_uiCW = uiCW;
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
ptry->m_auiSelectors[uiPixel] = auiPixelSelectors[uiPixel];
|
|
}
|
|
ptry->m_fError = fCWError;
|
|
}
|
|
|
|
}
|
|
|
|
if (ptry->m_fError < fBestTryError)
|
|
{
|
|
a_phalf->m_ptryBest = ptry;
|
|
fBestTryError = ptry->m_fError;
|
|
}
|
|
|
|
assert(ptry->m_fError < FLT_MAX);
|
|
|
|
a_phalf->m_uiTrys++;
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try version 1 of the degenerate search
|
|
// degenerate encodings use basecolor movement and a subset of the selectors to find useful encodings
|
|
// each subsequent version of the degenerate search uses more basecolor movement and is less likely to
|
|
// be successfull
|
|
//
|
|
void Block4x4Encoding_ETC1::TryDegenerates1(void)
|
|
{
|
|
|
|
TryDifferential(m_boolMostLikelyFlip, 1, -2, 0);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 2, 0);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 0, 2);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 0, -2);
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try version 2 of the degenerate search
|
|
// degenerate encodings use basecolor movement and a subset of the selectors to find useful encodings
|
|
// each subsequent version of the degenerate search uses more basecolor movement and is less likely to
|
|
// be successfull
|
|
//
|
|
void Block4x4Encoding_ETC1::TryDegenerates2(void)
|
|
{
|
|
|
|
TryDifferential(!m_boolMostLikelyFlip, 1, -2, 0);
|
|
TryDifferential(!m_boolMostLikelyFlip, 1, 2, 0);
|
|
TryDifferential(!m_boolMostLikelyFlip, 1, 0, 2);
|
|
TryDifferential(!m_boolMostLikelyFlip, 1, 0, -2);
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try version 3 of the degenerate search
|
|
// degenerate encodings use basecolor movement and a subset of the selectors to find useful encodings
|
|
// each subsequent version of the degenerate search uses more basecolor movement and is less likely to
|
|
// be successfull
|
|
//
|
|
void Block4x4Encoding_ETC1::TryDegenerates3(void)
|
|
{
|
|
|
|
TryDifferential(m_boolMostLikelyFlip, 1, -2, -2);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, -2, 2);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 2, -2);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 2, 2);
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// try version 4 of the degenerate search
|
|
// degenerate encodings use basecolor movement and a subset of the selectors to find useful encodings
|
|
// each subsequent version of the degenerate search uses more basecolor movement and is less likely to
|
|
// be successfull
|
|
//
|
|
void Block4x4Encoding_ETC1::TryDegenerates4(void)
|
|
{
|
|
|
|
TryDifferential(m_boolMostLikelyFlip, 1, -4, 0);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 4, 0);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 0, 4);
|
|
TryDifferential(m_boolMostLikelyFlip, 1, 0, -4);
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// find the best selector for each pixel based on a particular basecolor and CW that have been previously set
|
|
// calculate the selectors for each half of the block separately
|
|
// set the block error as the sum of each half's error
|
|
//
|
|
void Block4x4Encoding_ETC1::CalculateSelectors()
|
|
{
|
|
if (m_boolFlip)
|
|
{
|
|
CalculateHalfOfTheSelectors(0, s_auiTopPixelMapping);
|
|
CalculateHalfOfTheSelectors(1, s_auiBottomPixelMapping);
|
|
}
|
|
else
|
|
{
|
|
CalculateHalfOfTheSelectors(0, s_auiLeftPixelMapping);
|
|
CalculateHalfOfTheSelectors(1, s_auiRightPixelMapping);
|
|
}
|
|
|
|
m_fError = m_fError1 + m_fError2;
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// choose best selectors for half of the block
|
|
// calculate the error for half of the block
|
|
//
|
|
void Block4x4Encoding_ETC1::CalculateHalfOfTheSelectors(unsigned int a_uiHalf,
|
|
const unsigned int *pauiPixelMapping)
|
|
{
|
|
static const bool DEBUG_PRINT = false;
|
|
|
|
ColorFloatRGBA *pfrgbaColor = a_uiHalf ? &m_frgbaColor2 : &m_frgbaColor1;
|
|
unsigned int *puiCW = a_uiHalf ? &m_uiCW2 : &m_uiCW1;
|
|
|
|
float *pfHalfError = a_uiHalf ? &m_fError2 : &m_fError1;
|
|
*pfHalfError = FLT_MAX;
|
|
|
|
// try each CW
|
|
for (unsigned int uiCW = 0; uiCW < CW_RANGES; uiCW++)
|
|
{
|
|
if (DEBUG_PRINT)
|
|
{
|
|
printf("\ncw=%u\n", uiCW);
|
|
}
|
|
|
|
unsigned int auiPixelSelectors[PIXELS / 2];
|
|
ColorFloatRGBA afrgbaDecodedPixels[PIXELS / 2];
|
|
float afPixelErrors[PIXELS / 2] = { FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX, FLT_MAX };
|
|
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
if (DEBUG_PRINT)
|
|
{
|
|
printf("\tsource [%.2f,%.2f,%.2f]\n", m_pafrgbaSource[pauiPixelMapping[uiPixel]].fR,
|
|
m_pafrgbaSource[pauiPixelMapping[uiPixel]].fG, m_pafrgbaSource[pauiPixelMapping[uiPixel]].fB);
|
|
}
|
|
|
|
ColorFloatRGBA *pfrgbaSourcePixel = &m_pafrgbaSource[pauiPixelMapping[uiPixel]];
|
|
ColorFloatRGBA frgbaDecodedPixel;
|
|
|
|
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
|
|
{
|
|
float fDeltaRGB = s_aafCwTable[uiCW][uiSelector];
|
|
|
|
frgbaDecodedPixel = (*pfrgbaColor + fDeltaRGB).ClampRGB();
|
|
|
|
float fPixelError;
|
|
|
|
fPixelError = CalcPixelError(frgbaDecodedPixel, m_afDecodedAlphas[pauiPixelMapping[uiPixel]],
|
|
*pfrgbaSourcePixel);
|
|
|
|
if (DEBUG_PRINT)
|
|
{
|
|
printf("\tpixel %u, index %u [%.2f,%.2f,%.2f], error %.2f", uiPixel, uiSelector,
|
|
frgbaDecodedPixel.fR,
|
|
frgbaDecodedPixel.fG,
|
|
frgbaDecodedPixel.fB,
|
|
fPixelError);
|
|
}
|
|
|
|
if (fPixelError < afPixelErrors[uiPixel])
|
|
{
|
|
if (DEBUG_PRINT)
|
|
{
|
|
printf(" *");
|
|
}
|
|
|
|
auiPixelSelectors[uiPixel] = uiSelector;
|
|
afrgbaDecodedPixels[uiPixel] = frgbaDecodedPixel;
|
|
afPixelErrors[uiPixel] = fPixelError;
|
|
}
|
|
|
|
if (DEBUG_PRINT)
|
|
{
|
|
printf("\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
// add up all pixel errors
|
|
float fCWError = 0.0f;
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
fCWError += afPixelErrors[uiPixel];
|
|
}
|
|
if (DEBUG_PRINT)
|
|
{
|
|
printf("\terror %.2f\n", fCWError);
|
|
}
|
|
|
|
// if best CW so far
|
|
if (fCWError < *pfHalfError)
|
|
{
|
|
*pfHalfError = fCWError;
|
|
*puiCW = uiCW;
|
|
for (unsigned int uiPixel = 0; uiPixel < 8; uiPixel++)
|
|
{
|
|
m_auiSelectors[pauiPixelMapping[uiPixel]] = auiPixelSelectors[uiPixel];
|
|
m_afrgbaDecodedColors[pauiPixelMapping[uiPixel]] = afrgbaDecodedPixels[uiPixel];
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// set the encoding bits based on encoding state
|
|
//
|
|
void Block4x4Encoding_ETC1::SetEncodingBits(void)
|
|
{
|
|
assert(m_mode == MODE_ETC1);
|
|
|
|
if (m_boolDiff)
|
|
{
|
|
int iRed1 = m_frgbaColor1.IntRed(31.0f);
|
|
int iGreen1 = m_frgbaColor1.IntGreen(31.0f);
|
|
int iBlue1 = m_frgbaColor1.IntBlue(31.0f);
|
|
|
|
int iRed2 = m_frgbaColor2.IntRed(31.0f);
|
|
int iGreen2 = m_frgbaColor2.IntGreen(31.0f);
|
|
int iBlue2 = m_frgbaColor2.IntBlue(31.0f);
|
|
|
|
int iDRed2 = iRed2 - iRed1;
|
|
int iDGreen2 = iGreen2 - iGreen1;
|
|
int iDBlue2 = iBlue2 - iBlue1;
|
|
|
|
assert(iDRed2 >= -4 && iDRed2 < 4);
|
|
assert(iDGreen2 >= -4 && iDGreen2 < 4);
|
|
assert(iDBlue2 >= -4 && iDBlue2 < 4);
|
|
|
|
m_pencodingbitsRGB8->differential.red1 = (unsigned int)iRed1;
|
|
m_pencodingbitsRGB8->differential.green1 = (unsigned int)iGreen1;
|
|
m_pencodingbitsRGB8->differential.blue1 = (unsigned int)iBlue1;
|
|
|
|
m_pencodingbitsRGB8->differential.dred2 = iDRed2;
|
|
m_pencodingbitsRGB8->differential.dgreen2 = iDGreen2;
|
|
m_pencodingbitsRGB8->differential.dblue2 = iDBlue2;
|
|
}
|
|
else
|
|
{
|
|
m_pencodingbitsRGB8->individual.red1 = (unsigned int)m_frgbaColor1.IntRed(15.0f);
|
|
m_pencodingbitsRGB8->individual.green1 = (unsigned int)m_frgbaColor1.IntGreen(15.0f);
|
|
m_pencodingbitsRGB8->individual.blue1 = (unsigned int)m_frgbaColor1.IntBlue(15.0f);
|
|
|
|
m_pencodingbitsRGB8->individual.red2 = (unsigned int)m_frgbaColor2.IntRed(15.0f);
|
|
m_pencodingbitsRGB8->individual.green2 = (unsigned int)m_frgbaColor2.IntGreen(15.0f);
|
|
m_pencodingbitsRGB8->individual.blue2 = (unsigned int)m_frgbaColor2.IntBlue(15.0f);
|
|
}
|
|
|
|
m_pencodingbitsRGB8->individual.cw1 = m_uiCW1;
|
|
m_pencodingbitsRGB8->individual.cw2 = m_uiCW2;
|
|
|
|
SetEncodingBits_Selectors();
|
|
|
|
m_pencodingbitsRGB8->individual.diff = (unsigned int)m_boolDiff;
|
|
m_pencodingbitsRGB8->individual.flip = (unsigned int)m_boolFlip;
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// set the selectors in the encoding bits
|
|
//
|
|
void Block4x4Encoding_ETC1::SetEncodingBits_Selectors(void)
|
|
{
|
|
|
|
m_pencodingbitsRGB8->individual.selectors = 0;
|
|
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
unsigned int uiSelector = m_auiSelectors[uiPixel];
|
|
|
|
// set index msb
|
|
m_pencodingbitsRGB8->individual.selectors |= (uiSelector >> 1) << (uiPixel ^ 8);
|
|
|
|
// set index lsb
|
|
m_pencodingbitsRGB8->individual.selectors |= (uiSelector & 1) << ((16 + uiPixel) ^ 8);
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// set the decoded colors and decoded alpha based on the encoding state
|
|
//
|
|
void Block4x4Encoding_ETC1::Decode(void)
|
|
{
|
|
|
|
const unsigned int *pauiPixelOrder = m_boolFlip ? s_auiPixelOrderFlip1 : s_auiPixelOrderFlip0;
|
|
|
|
for (unsigned int uiPixelOrder = 0; uiPixelOrder < PIXELS; uiPixelOrder++)
|
|
{
|
|
ColorFloatRGBA *pfrgbaCenter = uiPixelOrder < 8 ? &m_frgbaColor1 : &m_frgbaColor2;
|
|
unsigned int uiCW = uiPixelOrder < 8 ? m_uiCW1 : m_uiCW2;
|
|
|
|
unsigned int uiPixel = pauiPixelOrder[uiPixelOrder];
|
|
|
|
float fDelta = s_aafCwTable[uiCW][m_auiSelectors[uiPixel]];
|
|
m_afrgbaDecodedColors[uiPixel] = (*pfrgbaCenter + fDelta).ClampRGB();
|
|
m_afDecodedAlphas[uiPixel] = 1.0f;
|
|
}
|
|
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
//
|
|
|
|
} // namespace Etc
|