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430 lines
15 KiB
C++
430 lines
15 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_R11.cpp
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Block4x4Encoding_R11 is the encoder to use when targetting file format R11 and SR11 (signed R11).
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*/
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#include "EtcConfig.h"
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#include "EtcBlock4x4Encoding_R11.h"
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#include "EtcBlock4x4EncodingBits.h"
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#include "EtcBlock4x4.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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// modifier values to use for R11, SR11, RG11 and SRG11
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float Block4x4Encoding_R11::s_aafModifierTable[MODIFIER_TABLE_ENTRYS][SELECTORS]
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{
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{ -3.0f / 255.0f, -6.0f / 255.0f, -9.0f / 255.0f, -15.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 8.0f / 255.0f, 14.0f / 255.0f },
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{ -3.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, -13.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f, 12.0f / 255.0f },
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{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 12.0f / 255.0f },
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{ -2.0f / 255.0f, -4.0f / 255.0f, -6.0f / 255.0f, -13.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 12.0f / 255.0f },
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{ -3.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -12.0f / 255.0f, 2.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 11.0f / 255.0f },
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{ -3.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f, 10.0f / 255.0f },
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{ -4.0f / 255.0f, -7.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
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{ -3.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -11.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 10.0f / 255.0f },
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{ -2.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
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{ -2.0f / 255.0f, -5.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
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{ -2.0f / 255.0f, -4.0f / 255.0f, -8.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 3.0f / 255.0f, 7.0f / 255.0f, 9.0f / 255.0f },
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{ -2.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 1.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
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{ -3.0f / 255.0f, -4.0f / 255.0f, -7.0f / 255.0f, -10.0f / 255.0f, 2.0f / 255.0f, 3.0f / 255.0f, 6.0f / 255.0f, 9.0f / 255.0f },
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{ -1.0f / 255.0f, -2.0f / 255.0f, -3.0f / 255.0f, -10.0f / 255.0f, 0.0f / 255.0f, 1.0f / 255.0f, 2.0f / 255.0f, 9.0f / 255.0f },
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{ -4.0f / 255.0f, -6.0f / 255.0f, -8.0f / 255.0f, -9.0f / 255.0f, 3.0f / 255.0f, 5.0f / 255.0f, 7.0f / 255.0f, 8.0f / 255.0f },
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{ -3.0f / 255.0f, -5.0f / 255.0f, -7.0f / 255.0f, -9.0f / 255.0f, 2.0f / 255.0f, 4.0f / 255.0f, 6.0f / 255.0f, 8.0f / 255.0f }
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};
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// ----------------------------------------------------------------------------------------------------
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//
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Block4x4Encoding_R11::Block4x4Encoding_R11(void)
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{
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m_pencodingbitsR11 = nullptr;
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}
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Block4x4Encoding_R11::~Block4x4Encoding_R11(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_R11::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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m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)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_R11::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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m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)a_paucEncodingBits;
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// init RGB portion
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Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
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(unsigned char *)m_pencodingbitsR11,
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a_pafrgbaSource,
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a_errormetric);
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// init R11 portion
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{
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m_mode = MODE_R11;
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if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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m_fRedBase = (float)(signed char)m_pencodingbitsR11->data.base;
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}
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else
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{
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m_fRedBase = (float)(unsigned char)m_pencodingbitsR11->data.base;
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}
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m_fRedMultiplier = (float)m_pencodingbitsR11->data.multiplier;
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m_uiRedModifierTableIndex = m_pencodingbitsR11->data.table;
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unsigned long long int ulliSelectorBits = 0;
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ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors0 << 40;
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ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors1 << 32;
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ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors2 << 24;
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ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors3 << 16;
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ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors4 << 8;
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ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors5;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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unsigned int uiShift = 45 - (3 * uiPixel);
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m_auiRedSelectors[uiPixel] = (ulliSelectorBits >> uiShift) & (SELECTORS - 1);
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}
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// decode the red channel
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// calc red error
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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float fDecodedPixelData = 0.0f;
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if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
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{
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fDecodedPixelData = DecodePixelRed(m_fRedBase, m_fRedMultiplier,
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m_uiRedModifierTableIndex,
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m_auiRedSelectors[uiPixel]);
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}
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else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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fDecodedPixelData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier,
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m_uiRedModifierTableIndex,
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m_auiRedSelectors[uiPixel]);
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}
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else
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{
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assert(0);
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}
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m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fDecodedPixelData, 0.0f, 0.0f, 1.0f);
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}
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CalcBlockError();
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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_R11::PerformIteration(float a_fEffort)
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{
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assert(!m_boolDone);
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m_mode = MODE_R11;
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switch (m_uiEncodingIterations)
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{
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case 0:
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m_fError = FLT_MAX;
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m_fRedBlockError = FLT_MAX; // artificially high value
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CalculateR11(8, 0.0f, 0.0f);
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m_fError = m_fRedBlockError;
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break;
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case 1:
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CalculateR11(8, 2.0f, 1.0f);
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m_fError = m_fRedBlockError;
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if (a_fEffort <= 24.5f)
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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 2:
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CalculateR11(8, 12.0f, 1.0f);
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m_fError = m_fRedBlockError;
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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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CalculateR11(7, 6.0f, 1.0f);
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m_fError = m_fRedBlockError;
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break;
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case 4:
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CalculateR11(6, 3.0f, 1.0f);
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m_fError = m_fRedBlockError;
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break;
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case 5:
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CalculateR11(5, 1.0f, 0.0f);
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m_fError = m_fRedBlockError;
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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 the best combination of base color, multiplier and selectors
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//
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// a_uiSelectorsUsed limits the number of selector combinations to try
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// a_fBaseRadius limits the range of base colors to try
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// a_fMultiplierRadius limits the range of multipliers to try
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//
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void Block4x4Encoding_R11::CalculateR11(unsigned int a_uiSelectorsUsed,
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float a_fBaseRadius, float a_fMultiplierRadius)
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{
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// maps from virtual (monotonic) selector to ETC selector
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static const unsigned int auiVirtualSelectorMap[8] = {3, 2, 1, 0, 4, 5, 6, 7};
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// find min/max red
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float fMinRed = 1.0f;
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float fMaxRed = 0.0f;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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// ignore border pixels
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float fAlpha = m_pafrgbaSource[uiPixel].fA;
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if (isnan(fAlpha))
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{
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continue;
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}
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float fRed = m_pafrgbaSource[uiPixel].fR;
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if (fRed < fMinRed)
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{
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fMinRed = fRed;
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}
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if (fRed > fMaxRed)
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{
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fMaxRed = fRed;
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}
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}
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assert(fMinRed <= fMaxRed);
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float fRedRange = (fMaxRed - fMinRed);
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// try each modifier table entry
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for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
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{
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for (unsigned int uiMinVirtualSelector = 0;
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uiMinVirtualSelector <= (8- a_uiSelectorsUsed);
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uiMinVirtualSelector++)
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{
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unsigned int uiMaxVirtualSelector = uiMinVirtualSelector + a_uiSelectorsUsed - 1;
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unsigned int uiMinSelector = auiVirtualSelectorMap[uiMinVirtualSelector];
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unsigned int uiMaxSelector = auiVirtualSelectorMap[uiMaxVirtualSelector];
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float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][uiMinSelector];
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float fTableEntryRange = s_aafModifierTable[uiTableEntry][uiMaxSelector] -
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s_aafModifierTable[uiTableEntry][uiMinSelector];
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float fCenterRatio = fTableEntryCenter / fTableEntryRange;
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float fCenter = fMinRed + fCenterRatio*fRedRange;
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fCenter = roundf(255.0f * fCenter) / 255.0f;
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float fMinBase = fCenter - (a_fBaseRadius / 255.0f);
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if (fMinBase < 0.0f)
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{
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fMinBase = 0.0f;
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}
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float fMaxBase = fCenter + (a_fBaseRadius / 255.0f);
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if (fMaxBase > 1.0f)
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{
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fMaxBase = 1.0f;
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}
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for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
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{
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float fRangeMultiplier = roundf(fRedRange / fTableEntryRange);
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float fMinMultiplier = fRangeMultiplier - a_fMultiplierRadius;
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if (fMinMultiplier < 1.0f)
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{
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fMinMultiplier = 0.0f;
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}
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else if (fMinMultiplier > 15.0f)
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{
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fMinMultiplier = 15.0f;
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}
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float fMaxMultiplier = fRangeMultiplier + a_fMultiplierRadius;
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if (fMaxMultiplier < 1.0f)
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{
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fMaxMultiplier = 1.0f;
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}
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else if (fMaxMultiplier > 15.0f)
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{
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fMaxMultiplier = 15.0f;
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}
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for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
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{
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// find best selector for each pixel
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unsigned int auiBestSelectors[PIXELS];
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float afBestRedError[PIXELS];
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float afBestPixelRed[PIXELS];
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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float fBestPixelRedError = FLT_MAX;
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for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
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{
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float fPixelRed = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
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ColorFloatRGBA frgba(fPixelRed, m_pafrgbaSource[uiPixel].fG,0.0f,1.0f);
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float fPixelRedError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
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if (fPixelRedError < fBestPixelRedError)
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{
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fBestPixelRedError = fPixelRedError;
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auiBestSelectors[uiPixel] = uiSelector;
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afBestRedError[uiPixel] = fBestPixelRedError;
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afBestPixelRed[uiPixel] = fPixelRed;
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}
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}
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}
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float fBlockError = 0.0f;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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fBlockError += afBestRedError[uiPixel];
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}
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if (fBlockError < m_fRedBlockError)
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{
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m_fRedBlockError = fBlockError;
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if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
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{
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m_fRedBase = 255.0f * fBase;
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}
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else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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m_fRedBase = (fBase * 255) - 128;
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}
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else
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{
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assert(0);
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}
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m_fRedMultiplier = fMultiplier;
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m_uiRedModifierTableIndex = uiTableEntry;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
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{
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m_auiRedSelectors[uiPixel] = auiBestSelectors[uiPixel];
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float fBestPixelRed = afBestPixelRed[uiPixel];
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m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fBestPixelRed, 0.0f, 0.0f, 1.0f);
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m_afDecodedAlphas[uiPixel] = 1.0f;
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}
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}
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}
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}
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}
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}
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}
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// ----------------------------------------------------------------------------------------------------
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// set the encoding bits based on encoding state
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//
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void Block4x4Encoding_R11::SetEncodingBits(void)
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{
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if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
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{
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m_pencodingbitsR11->data.base = (unsigned char)roundf(m_fRedBase);
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}
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else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
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{
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m_pencodingbitsR11->data.base = (signed char)roundf(m_fRedBase);
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}
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else
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{
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assert(0);
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}
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m_pencodingbitsR11->data.table = m_uiRedModifierTableIndex;
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m_pencodingbitsR11->data.multiplier = (unsigned char)roundf(m_fRedMultiplier);
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unsigned long long int ulliSelectorBits = 0;
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for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
unsigned int uiShift = 45 - (3 * uiPixel);
|
|
ulliSelectorBits |= ((unsigned long long int)m_auiRedSelectors[uiPixel]) << uiShift;
|
|
}
|
|
|
|
m_pencodingbitsR11->data.selectors0 = ulliSelectorBits >> 40;
|
|
m_pencodingbitsR11->data.selectors1 = ulliSelectorBits >> 32;
|
|
m_pencodingbitsR11->data.selectors2 = ulliSelectorBits >> 24;
|
|
m_pencodingbitsR11->data.selectors3 = ulliSelectorBits >> 16;
|
|
m_pencodingbitsR11->data.selectors4 = ulliSelectorBits >> 8;
|
|
m_pencodingbitsR11->data.selectors5 = ulliSelectorBits;
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
//
|
|
}
|