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pandemonium_engine/thirdparty/etc2comp/EtcBlock4x4Encoding_RG11.cpp

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/*
* Copyright 2015 The Etc2Comp Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
EtcBlock4x4Encoding_RG11.cpp
Block4x4Encoding_RG11 is the encoder to use when targetting file format RG11 and SRG11 (signed RG11).
*/
#include "EtcConfig.h"
#include "EtcBlock4x4Encoding_RG11.h"
#include "EtcBlock4x4EncodingBits.h"
#include "EtcBlock4x4.h"
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <float.h>
#include <limits>
namespace Etc
{
// ----------------------------------------------------------------------------------------------------
//
Block4x4Encoding_RG11::Block4x4Encoding_RG11(void)
{
m_pencodingbitsRG11 = nullptr;
}
Block4x4Encoding_RG11::~Block4x4Encoding_RG11(void) {}
// ----------------------------------------------------------------------------------------------------
// initialization prior to encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits
//
void Block4x4Encoding_RG11::InitFromSource(Block4x4 *a_pblockParent,
ColorFloatRGBA *a_pafrgbaSource,
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
{
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
}
// ----------------------------------------------------------------------------------------------------
// initialization from the encoding bits of a previous encoding
// a_pblockParent points to the block associated with this encoding
// a_errormetric is used to choose the best encoding
// a_pafrgbaSource points to a 4x4 block subset of the source image
// a_paucEncodingBits points to the final encoding bits of a previous encoding
//
void Block4x4Encoding_RG11::InitFromEncodingBits(Block4x4 *a_pblockParent,
unsigned char *a_paucEncodingBits,
ColorFloatRGBA *a_pafrgbaSource,
ErrorMetric a_errormetric)
{
m_pencodingbitsRG11 = (Block4x4EncodingBits_RG11 *)a_paucEncodingBits;
// init RGB portion
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
(unsigned char *)m_pencodingbitsRG11,
a_pafrgbaSource,
a_errormetric);
m_fError = 0.0f;
{
m_mode = MODE_RG11;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fRedBase = (float)(signed char)m_pencodingbitsRG11->data.baseR;
m_fGrnBase = (float)(signed char)m_pencodingbitsRG11->data.baseG;
}
else
{
m_fRedBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseR;
m_fGrnBase = (float)(unsigned char)m_pencodingbitsRG11->data.baseG;
}
m_fRedMultiplier = (float)m_pencodingbitsRG11->data.multiplierR;
m_fGrnMultiplier = (float)m_pencodingbitsRG11->data.multiplierG;
m_uiRedModifierTableIndex = m_pencodingbitsRG11->data.tableIndexR;
m_uiGrnModifierTableIndex = m_pencodingbitsRG11->data.tableIndexG;
unsigned long long int ulliSelectorBitsR = 0;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR0 << 40;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR1 << 32;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR2 << 24;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR3 << 16;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR4 << 8;
ulliSelectorBitsR |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsR5;
unsigned long long int ulliSelectorBitsG = 0;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG0 << 40;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG1 << 32;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG2 << 24;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG3 << 16;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG4 << 8;
ulliSelectorBitsG |= (unsigned long long int)m_pencodingbitsRG11->data.selectorsG5;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
m_auiRedSelectors[uiPixel] = (ulliSelectorBitsR >> uiShift) & (SELECTORS - 1);
m_auiGrnSelectors[uiPixel] = (ulliSelectorBitsG >> uiShift) & (SELECTORS - 1);
}
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fRedDecodedData = 0.0f;
float fGrnDecodedData = 0.0f;
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
fRedDecodedData = DecodePixelRed(m_fRedBase, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
fGrnDecodedData = DecodePixelRed(m_fGrnBase, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
}
else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
fRedDecodedData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier, m_uiRedModifierTableIndex, m_auiRedSelectors[uiPixel]);
fGrnDecodedData = DecodePixelRed(m_fGrnBase + 128, m_fGrnMultiplier, m_uiGrnModifierTableIndex, m_auiGrnSelectors[uiPixel]);
}
else
{
assert(0);
}
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fRedDecodedData, fGrnDecodedData, 0.0f, 1.0f);
}
}
CalcBlockError();
}
// ----------------------------------------------------------------------------------------------------
// perform a single encoding iteration
// replace the encoding if a better encoding was found
// subsequent iterations generally take longer for each iteration
// set m_boolDone if encoding is perfect or encoding is finished based on a_fEffort
//
void Block4x4Encoding_RG11::PerformIteration(float a_fEffort)
{
assert(!m_boolDone);
switch (m_uiEncodingIterations)
{
case 0:
m_fError = FLT_MAX;
m_fGrnBlockError = FLT_MAX; // artificially high value
m_fRedBlockError = FLT_MAX;
CalculateR11(8, 0.0f, 0.0f);
CalculateG11(8, 0.0f, 0.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 1:
CalculateR11(8, 2.0f, 1.0f);
CalculateG11(8, 2.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
if (a_fEffort <= 24.5f)
{
m_boolDone = true;
}
break;
case 2:
CalculateR11(8, 12.0f, 1.0f);
CalculateG11(8, 12.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
if (a_fEffort <= 49.5f)
{
m_boolDone = true;
}
break;
case 3:
CalculateR11(7, 6.0f, 1.0f);
CalculateG11(7, 6.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 4:
CalculateR11(6, 3.0f, 1.0f);
CalculateG11(6, 3.0f, 1.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
break;
case 5:
CalculateR11(5, 1.0f, 0.0f);
CalculateG11(5, 1.0f, 0.0f);
m_fError = (m_fGrnBlockError + m_fRedBlockError);
m_boolDone = true;
break;
default:
assert(0);
break;
}
m_uiEncodingIterations++;
SetDoneIfPerfect();
}
// ----------------------------------------------------------------------------------------------------
// find the best combination of base color, multiplier and selectors
//
// a_uiSelectorsUsed limits the number of selector combinations to try
// a_fBaseRadius limits the range of base colors to try
// a_fMultiplierRadius limits the range of multipliers to try
//
void Block4x4Encoding_RG11::CalculateG11(unsigned int a_uiSelectorsUsed,
float a_fBaseRadius, float a_fMultiplierRadius)
{
// maps from virtual (monotonic) selector to etc selector
static const unsigned int auiVirtualSelectorMap[8] = { 3, 2, 1, 0, 4, 5, 6, 7 };
// find min/max Grn
float fMinGrn = 1.0f;
float fMaxGrn = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
// ignore border pixels
float fAlpha = m_pafrgbaSource[uiPixel].fA;
if (isnan(fAlpha))
{
continue;
}
float fGrn = m_pafrgbaSource[uiPixel].fG;
if (fGrn < fMinGrn)
{
fMinGrn = fGrn;
}
if (fGrn > fMaxGrn)
{
fMaxGrn = fGrn;
}
}
assert(fMinGrn <= fMaxGrn);
float fGrnRange = (fMaxGrn - fMinGrn);
// try each modifier table entry
for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
{
for (unsigned int uiMinVirtualSelector = 0;
uiMinVirtualSelector <= (8 - a_uiSelectorsUsed);
uiMinVirtualSelector++)
{
unsigned int uiMaxVirtualSelector = uiMinVirtualSelector + a_uiSelectorsUsed - 1;
unsigned int uiMinSelector = auiVirtualSelectorMap[uiMinVirtualSelector];
unsigned int uiMaxSelector = auiVirtualSelectorMap[uiMaxVirtualSelector];
float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][uiMinSelector];
float fTableEntryRange = s_aafModifierTable[uiTableEntry][uiMaxSelector] -
s_aafModifierTable[uiTableEntry][uiMinSelector];
float fCenterRatio = fTableEntryCenter / fTableEntryRange;
float fCenter = fMinGrn + fCenterRatio*fGrnRange;
fCenter = roundf(255.0f * fCenter) / 255.0f;
float fMinBase = fCenter - (a_fBaseRadius / 255.0f);
if (fMinBase < 0.0f)
{
fMinBase = 0.0f;
}
float fMaxBase = fCenter + (a_fBaseRadius / 255.0f);
if (fMaxBase > 1.0f)
{
fMaxBase = 1.0f;
}
for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
{
float fRangeMultiplier = roundf(fGrnRange / fTableEntryRange);
float fMinMultiplier = fRangeMultiplier - a_fMultiplierRadius;
if (fMinMultiplier < 1.0f)
{
fMinMultiplier = 0.0f;
}
else if (fMinMultiplier > 15.0f)
{
fMinMultiplier = 15.0f;
}
float fMaxMultiplier = fRangeMultiplier + a_fMultiplierRadius;
if (fMaxMultiplier < 1.0f)
{
fMaxMultiplier = 1.0f;
}
else if (fMaxMultiplier > 15.0f)
{
fMaxMultiplier = 15.0f;
}
for (float fMultiplier = fMinMultiplier; fMultiplier <= fMaxMultiplier; fMultiplier += 1.0f)
{
// find best selector for each pixel
unsigned int auiBestSelectors[PIXELS];
float afBestGrnError[PIXELS];
float afBestPixelGrn[PIXELS];
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
float fBestPixelGrnError = FLT_MAX;
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
{
//DecodePixelRed is not red channel specific
float fPixelGrn = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
ColorFloatRGBA frgba(m_pafrgbaSource[uiPixel].fR, fPixelGrn, 0.0f, 1.0f);
float fPixelGrnError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
if (fPixelGrnError < fBestPixelGrnError)
{
fBestPixelGrnError = fPixelGrnError;
auiBestSelectors[uiPixel] = uiSelector;
afBestGrnError[uiPixel] = fBestPixelGrnError;
afBestPixelGrn[uiPixel] = fPixelGrn;
}
}
}
float fBlockError = 0.0f;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
fBlockError += afBestGrnError[uiPixel];
}
if (fBlockError < m_fGrnBlockError)
{
m_fGrnBlockError = fBlockError;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_fGrnBase = 255.0f * fBase;
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_fGrnBase = (fBase * 255) - 128;
}
else
{
assert(0);
}
m_fGrnMultiplier = fMultiplier;
m_uiGrnModifierTableIndex = uiTableEntry;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
m_auiGrnSelectors[uiPixel] = auiBestSelectors[uiPixel];
m_afrgbaDecodedColors[uiPixel].fG = afBestPixelGrn[uiPixel];
m_afDecodedAlphas[uiPixel] = 1.0f;
}
}
}
}
}
}
}
// ----------------------------------------------------------------------------------------------------
// set the encoding bits based on encoding state
//
void Block4x4Encoding_RG11::SetEncodingBits(void)
{
unsigned long long int ulliSelectorBitsR = 0;
unsigned long long int ulliSelectorBitsG = 0;
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
{
unsigned int uiShift = 45 - (3 * uiPixel);
ulliSelectorBitsR |= ((unsigned long long int)m_auiRedSelectors[uiPixel]) << uiShift;
ulliSelectorBitsG |= ((unsigned long long int)m_auiGrnSelectors[uiPixel]) << uiShift;
}
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsRG11->data.baseR = (unsigned char)roundf(m_fRedBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsRG11->data.baseR = (signed char)roundf(m_fRedBase);
}
else
{
assert(0);
}
m_pencodingbitsRG11->data.tableIndexR = m_uiRedModifierTableIndex;
m_pencodingbitsRG11->data.multiplierR = (unsigned char)roundf(m_fRedMultiplier);
m_pencodingbitsRG11->data.selectorsR0 = ulliSelectorBitsR >> 40;
m_pencodingbitsRG11->data.selectorsR1 = ulliSelectorBitsR >> 32;
m_pencodingbitsRG11->data.selectorsR2 = ulliSelectorBitsR >> 24;
m_pencodingbitsRG11->data.selectorsR3 = ulliSelectorBitsR >> 16;
m_pencodingbitsRG11->data.selectorsR4 = ulliSelectorBitsR >> 8;
m_pencodingbitsRG11->data.selectorsR5 = ulliSelectorBitsR;
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
{
m_pencodingbitsRG11->data.baseG = (unsigned char)roundf(m_fGrnBase);
}
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
{
m_pencodingbitsRG11->data.baseG = (signed char)roundf(m_fGrnBase);
}
else
{
assert(0);
}
m_pencodingbitsRG11->data.tableIndexG = m_uiGrnModifierTableIndex;
m_pencodingbitsRG11->data.multiplierG = (unsigned char)roundf(m_fGrnMultiplier);
m_pencodingbitsRG11->data.selectorsG0 = ulliSelectorBitsG >> 40;
m_pencodingbitsRG11->data.selectorsG1 = ulliSelectorBitsG >> 32;
m_pencodingbitsRG11->data.selectorsG2 = ulliSelectorBitsG >> 24;
m_pencodingbitsRG11->data.selectorsG3 = ulliSelectorBitsG >> 16;
m_pencodingbitsRG11->data.selectorsG4 = ulliSelectorBitsG >> 8;
m_pencodingbitsRG11->data.selectorsG5 = ulliSelectorBitsG;
}
// ----------------------------------------------------------------------------------------------------
//
}
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