You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
430 lines
15 KiB
C++
430 lines
15 KiB
C++
/*
|
|
* 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_R11.cpp
|
|
|
|
Block4x4Encoding_R11 is the encoder to use when targetting file format R11 and SR11 (signed R11).
|
|
|
|
*/
|
|
|
|
#include "EtcConfig.h"
|
|
#include "EtcBlock4x4Encoding_R11.h"
|
|
|
|
#include "EtcBlock4x4EncodingBits.h"
|
|
#include "EtcBlock4x4.h"
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <assert.h>
|
|
#include <float.h>
|
|
#include <limits>
|
|
|
|
namespace Etc
|
|
{
|
|
|
|
// modifier values to use for R11, SR11, RG11 and SRG11
|
|
float Block4x4Encoding_R11::s_aafModifierTable[MODIFIER_TABLE_ENTRYS][SELECTORS]
|
|
{
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 },
|
|
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 },
|
|
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 },
|
|
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 },
|
|
{ -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 }
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
//
|
|
Block4x4Encoding_R11::Block4x4Encoding_R11(void)
|
|
{
|
|
|
|
m_pencodingbitsR11 = nullptr;
|
|
|
|
}
|
|
|
|
Block4x4Encoding_R11::~Block4x4Encoding_R11(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_R11::InitFromSource(Block4x4 *a_pblockParent,
|
|
ColorFloatRGBA *a_pafrgbaSource,
|
|
unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
|
|
{
|
|
Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
|
|
|
|
m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)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_R11::InitFromEncodingBits(Block4x4 *a_pblockParent,
|
|
unsigned char *a_paucEncodingBits,
|
|
ColorFloatRGBA *a_pafrgbaSource,
|
|
ErrorMetric a_errormetric)
|
|
{
|
|
m_pencodingbitsR11 = (Block4x4EncodingBits_R11 *)a_paucEncodingBits;
|
|
|
|
// init RGB portion
|
|
Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
|
|
(unsigned char *)m_pencodingbitsR11,
|
|
a_pafrgbaSource,
|
|
a_errormetric);
|
|
|
|
// init R11 portion
|
|
{
|
|
m_mode = MODE_R11;
|
|
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
|
|
{
|
|
m_fRedBase = (float)(signed char)m_pencodingbitsR11->data.base;
|
|
}
|
|
else
|
|
{
|
|
m_fRedBase = (float)(unsigned char)m_pencodingbitsR11->data.base;
|
|
}
|
|
m_fRedMultiplier = (float)m_pencodingbitsR11->data.multiplier;
|
|
m_uiRedModifierTableIndex = m_pencodingbitsR11->data.table;
|
|
|
|
unsigned long long int ulliSelectorBits = 0;
|
|
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors0 << 40;
|
|
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors1 << 32;
|
|
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors2 << 24;
|
|
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors3 << 16;
|
|
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors4 << 8;
|
|
ulliSelectorBits |= (unsigned long long int)m_pencodingbitsR11->data.selectors5;
|
|
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
unsigned int uiShift = 45 - (3 * uiPixel);
|
|
m_auiRedSelectors[uiPixel] = (ulliSelectorBits >> uiShift) & (SELECTORS - 1);
|
|
}
|
|
|
|
// decode the red channel
|
|
// calc red error
|
|
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
float fDecodedPixelData = 0.0f;
|
|
if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
|
|
{
|
|
fDecodedPixelData = DecodePixelRed(m_fRedBase, m_fRedMultiplier,
|
|
m_uiRedModifierTableIndex,
|
|
m_auiRedSelectors[uiPixel]);
|
|
}
|
|
else if (a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || a_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
|
|
{
|
|
fDecodedPixelData = DecodePixelRed(m_fRedBase + 128, m_fRedMultiplier,
|
|
m_uiRedModifierTableIndex,
|
|
m_auiRedSelectors[uiPixel]);
|
|
}
|
|
else
|
|
{
|
|
assert(0);
|
|
}
|
|
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fDecodedPixelData, 0.0f, 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_R11::PerformIteration(float a_fEffort)
|
|
{
|
|
assert(!m_boolDone);
|
|
m_mode = MODE_R11;
|
|
|
|
switch (m_uiEncodingIterations)
|
|
{
|
|
case 0:
|
|
m_fError = FLT_MAX;
|
|
m_fRedBlockError = FLT_MAX; // artificially high value
|
|
CalculateR11(8, 0.0f, 0.0f);
|
|
m_fError = m_fRedBlockError;
|
|
break;
|
|
|
|
case 1:
|
|
CalculateR11(8, 2.0f, 1.0f);
|
|
m_fError = m_fRedBlockError;
|
|
if (a_fEffort <= 24.5f)
|
|
{
|
|
m_boolDone = true;
|
|
}
|
|
break;
|
|
|
|
case 2:
|
|
CalculateR11(8, 12.0f, 1.0f);
|
|
m_fError = m_fRedBlockError;
|
|
if (a_fEffort <= 49.5f)
|
|
{
|
|
m_boolDone = true;
|
|
}
|
|
break;
|
|
|
|
case 3:
|
|
CalculateR11(7, 6.0f, 1.0f);
|
|
m_fError = m_fRedBlockError;
|
|
break;
|
|
|
|
case 4:
|
|
CalculateR11(6, 3.0f, 1.0f);
|
|
m_fError = m_fRedBlockError;
|
|
break;
|
|
|
|
case 5:
|
|
CalculateR11(5, 1.0f, 0.0f);
|
|
m_fError = 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_R11::CalculateR11(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 red
|
|
float fMinRed = 1.0f;
|
|
float fMaxRed = 0.0f;
|
|
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
// ignore border pixels
|
|
float fAlpha = m_pafrgbaSource[uiPixel].fA;
|
|
if (isnan(fAlpha))
|
|
{
|
|
continue;
|
|
}
|
|
|
|
float fRed = m_pafrgbaSource[uiPixel].fR;
|
|
|
|
if (fRed < fMinRed)
|
|
{
|
|
fMinRed = fRed;
|
|
}
|
|
if (fRed > fMaxRed)
|
|
{
|
|
fMaxRed = fRed;
|
|
}
|
|
}
|
|
assert(fMinRed <= fMaxRed);
|
|
|
|
float fRedRange = (fMaxRed - fMinRed);
|
|
|
|
// 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 = fMinRed + fCenterRatio*fRedRange;
|
|
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(fRedRange / 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 afBestRedError[PIXELS];
|
|
float afBestPixelRed[PIXELS];
|
|
|
|
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
float fBestPixelRedError = FLT_MAX;
|
|
|
|
for (unsigned int uiSelector = 0; uiSelector < SELECTORS; uiSelector++)
|
|
{
|
|
float fPixelRed = DecodePixelRed(fBase * 255.0f, fMultiplier, uiTableEntry, uiSelector);
|
|
|
|
ColorFloatRGBA frgba(fPixelRed, m_pafrgbaSource[uiPixel].fG,0.0f,1.0f);
|
|
|
|
float fPixelRedError = CalcPixelError(frgba, 1.0f, m_pafrgbaSource[uiPixel]);
|
|
|
|
if (fPixelRedError < fBestPixelRedError)
|
|
{
|
|
fBestPixelRedError = fPixelRedError;
|
|
auiBestSelectors[uiPixel] = uiSelector;
|
|
afBestRedError[uiPixel] = fBestPixelRedError;
|
|
afBestPixelRed[uiPixel] = fPixelRed;
|
|
}
|
|
}
|
|
}
|
|
float fBlockError = 0.0f;
|
|
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
fBlockError += afBestRedError[uiPixel];
|
|
}
|
|
if (fBlockError < m_fRedBlockError)
|
|
{
|
|
m_fRedBlockError = fBlockError;
|
|
|
|
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
|
|
{
|
|
m_fRedBase = 255.0f * fBase;
|
|
}
|
|
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
|
|
{
|
|
m_fRedBase = (fBase * 255) - 128;
|
|
}
|
|
else
|
|
{
|
|
assert(0);
|
|
}
|
|
m_fRedMultiplier = fMultiplier;
|
|
m_uiRedModifierTableIndex = uiTableEntry;
|
|
|
|
for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
|
|
{
|
|
m_auiRedSelectors[uiPixel] = auiBestSelectors[uiPixel];
|
|
float fBestPixelRed = afBestPixelRed[uiPixel];
|
|
m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA(fBestPixelRed, 0.0f, 0.0f, 1.0f);
|
|
m_afDecodedAlphas[uiPixel] = 1.0f;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
// set the encoding bits based on encoding state
|
|
//
|
|
void Block4x4Encoding_R11::SetEncodingBits(void)
|
|
{
|
|
if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::RG11)
|
|
{
|
|
m_pencodingbitsR11->data.base = (unsigned char)roundf(m_fRedBase);
|
|
}
|
|
else if (m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_R11 || m_pblockParent->GetImageSource()->GetFormat() == Image::Format::SIGNED_RG11)
|
|
{
|
|
m_pencodingbitsR11->data.base = (signed char)roundf(m_fRedBase);
|
|
}
|
|
else
|
|
{
|
|
assert(0);
|
|
}
|
|
m_pencodingbitsR11->data.table = m_uiRedModifierTableIndex;
|
|
m_pencodingbitsR11->data.multiplier = (unsigned char)roundf(m_fRedMultiplier);
|
|
|
|
unsigned long long int ulliSelectorBits = 0;
|
|
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;
|
|
}
|
|
|
|
// ----------------------------------------------------------------------------------------------------
|
|
//
|
|
}
|