summaryrefslogtreecommitdiff
path: root/thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.cpp')
-rw-r--r--thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.cpp474
1 files changed, 474 insertions, 0 deletions
diff --git a/thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.cpp b/thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.cpp
new file mode 100644
index 0000000000..600c7ab405
--- /dev/null
+++ b/thirdparty/etc2comp/EtcBlock4x4Encoding_RGBA8.cpp
@@ -0,0 +1,474 @@
+/*
+ * 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_RGBA8.cpp contains:
+ Block4x4Encoding_RGBA8
+ Block4x4Encoding_RGBA8_Opaque
+ Block4x4Encoding_RGBA8_Transparent
+
+These encoders are used when targetting file format RGBA8.
+
+Block4x4Encoding_RGBA8_Opaque is used when all pixels in the 4x4 block are opaque
+Block4x4Encoding_RGBA8_Transparent is used when all pixels in the 4x4 block are transparent
+Block4x4Encoding_RGBA8 is used when there is a mixture of alphas in the 4x4 block
+
+*/
+
+#include "EtcConfig.h"
+#include "EtcBlock4x4Encoding_RGBA8.h"
+
+#include "EtcBlock4x4EncodingBits.h"
+#include "EtcBlock4x4.h"
+
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include <float.h>
+#include <limits>
+
+namespace Etc
+{
+
+ // ####################################################################################################
+ // Block4x4Encoding_RGBA8
+ // ####################################################################################################
+
+ float Block4x4Encoding_RGBA8::s_aafModifierTable[MODIFIER_TABLE_ENTRYS][ALPHA_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_RGBA8::Block4x4Encoding_RGBA8(void)
+ {
+
+ m_pencodingbitsA8 = nullptr;
+
+ }
+ Block4x4Encoding_RGBA8::~Block4x4Encoding_RGBA8(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_RGBA8::InitFromSource(Block4x4 *a_pblockParent,
+ ColorFloatRGBA *a_pafrgbaSource,
+ unsigned char *a_paucEncodingBits, ErrorMetric a_errormetric)
+ {
+ Block4x4Encoding::Init(a_pblockParent, a_pafrgbaSource,a_errormetric);
+
+ m_pencodingbitsA8 = (Block4x4EncodingBits_A8 *)a_paucEncodingBits;
+ m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)(a_paucEncodingBits + sizeof(Block4x4EncodingBits_A8));
+
+ }
+
+ // ----------------------------------------------------------------------------------------------------
+ // 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_RGBA8::InitFromEncodingBits(Block4x4 *a_pblockParent,
+ unsigned char *a_paucEncodingBits,
+ ColorFloatRGBA *a_pafrgbaSource,
+ ErrorMetric a_errormetric)
+ {
+
+ m_pencodingbitsA8 = (Block4x4EncodingBits_A8 *)a_paucEncodingBits;
+ m_pencodingbitsRGB8 = (Block4x4EncodingBits_RGB8 *)(a_paucEncodingBits + sizeof(Block4x4EncodingBits_A8));
+
+ // init RGB portion
+ Block4x4Encoding_RGB8::InitFromEncodingBits(a_pblockParent,
+ (unsigned char *) m_pencodingbitsRGB8,
+ a_pafrgbaSource,
+ a_errormetric);
+
+ // init A8 portion
+ // has to be done after InitFromEncodingBits()
+ {
+ m_fBase = m_pencodingbitsA8->data.base / 255.0f;
+ m_fMultiplier = (float)m_pencodingbitsA8->data.multiplier;
+ m_uiModifierTableIndex = m_pencodingbitsA8->data.table;
+
+ unsigned long long int ulliSelectorBits = 0;
+ ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors0 << 40;
+ ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors1 << 32;
+ ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors2 << 24;
+ ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors3 << 16;
+ ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors4 << 8;
+ ulliSelectorBits |= (unsigned long long int)m_pencodingbitsA8->data.selectors5;
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ unsigned int uiShift = 45 - (3 * uiPixel);
+ m_auiAlphaSelectors[uiPixel] = (ulliSelectorBits >> uiShift) & (ALPHA_SELECTORS - 1);
+ }
+
+ // decode the alphas
+ // calc alpha error
+ m_fError = 0.0f;
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ m_afDecodedAlphas[uiPixel] = DecodePixelAlpha(m_fBase, m_fMultiplier,
+ m_uiModifierTableIndex,
+ m_auiAlphaSelectors[uiPixel]);
+
+ float fDeltaAlpha = m_afDecodedAlphas[uiPixel] - m_pafrgbaSource[uiPixel].fA;
+ m_fError += fDeltaAlpha * fDeltaAlpha;
+ }
+ }
+
+ // redo error calc to include alpha
+ 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
+ //
+ // similar to Block4x4Encoding_RGB8_Base::Encode_RGB8(), but with alpha added
+ //
+ void Block4x4Encoding_RGBA8::PerformIteration(float a_fEffort)
+ {
+ assert(!m_boolDone);
+
+ if (m_uiEncodingIterations == 0)
+ {
+ if (a_fEffort < 24.9f)
+ {
+ CalculateA8(0.0f);
+ }
+ else if (a_fEffort < 49.9f)
+ {
+ CalculateA8(1.0f);
+ }
+ else
+ {
+ CalculateA8(2.0f);
+ }
+ }
+
+ Block4x4Encoding_RGB8::PerformIteration(a_fEffort);
+
+ }
+
+ // ----------------------------------------------------------------------------------------------------
+ // find the best combination of base alpga, multiplier and selectors
+ //
+ // a_fRadius limits the range of base alpha to try
+ //
+ void Block4x4Encoding_RGBA8::CalculateA8(float a_fRadius)
+ {
+
+ // find min/max alpha
+ float fMinAlpha = 1.0f;
+ float fMaxAlpha = 0.0f;
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ float fAlpha = m_pafrgbaSource[uiPixel].fA;
+
+ // ignore border pixels
+ if (isnan(fAlpha))
+ {
+ continue;
+ }
+
+ if (fAlpha < fMinAlpha)
+ {
+ fMinAlpha = fAlpha;
+ }
+ if (fAlpha > fMaxAlpha)
+ {
+ fMaxAlpha = fAlpha;
+ }
+ }
+ assert(fMinAlpha <= fMaxAlpha);
+
+ float fAlphaRange = fMaxAlpha - fMinAlpha;
+
+ // try each modifier table entry
+ m_fError = FLT_MAX; // artificially high value
+ for (unsigned int uiTableEntry = 0; uiTableEntry < MODIFIER_TABLE_ENTRYS; uiTableEntry++)
+ {
+ static const unsigned int MIN_VALUE_SELECTOR = 3;
+ static const unsigned int MAX_VALUE_SELECTOR = 7;
+
+ float fTableEntryCenter = -s_aafModifierTable[uiTableEntry][MIN_VALUE_SELECTOR];
+
+ float fTableEntryRange = s_aafModifierTable[uiTableEntry][MAX_VALUE_SELECTOR] -
+ s_aafModifierTable[uiTableEntry][MIN_VALUE_SELECTOR];
+
+ float fCenterRatio = fTableEntryCenter / fTableEntryRange;
+
+ float fCenter = fMinAlpha + fCenterRatio*fAlphaRange;
+ fCenter = roundf(255.0f * fCenter) / 255.0f;
+
+ float fMinBase = fCenter - (a_fRadius / 255.0f);
+ if (fMinBase < 0.0f)
+ {
+ fMinBase = 0.0f;
+ }
+
+ float fMaxBase = fCenter + (a_fRadius / 255.0f);
+ if (fMaxBase > 1.0f)
+ {
+ fMaxBase = 1.0f;
+ }
+
+ for (float fBase = fMinBase; fBase <= fMaxBase; fBase += (0.999999f / 255.0f))
+ {
+
+ float fRangeMultiplier = roundf(fAlphaRange / fTableEntryRange);
+
+ float fMinMultiplier = fRangeMultiplier - a_fRadius;
+ if (fMinMultiplier < 1.0f)
+ {
+ fMinMultiplier = 1.0f;
+ }
+ else if (fMinMultiplier > 15.0f)
+ {
+ fMinMultiplier = 15.0f;
+ }
+
+ float fMaxMultiplier = fRangeMultiplier + a_fRadius;
+ 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 afBestAlphaError[PIXELS];
+ float afBestDecodedAlphas[PIXELS];
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ float fBestPixelAlphaError = FLT_MAX;
+ for (unsigned int uiSelector = 0; uiSelector < ALPHA_SELECTORS; uiSelector++)
+ {
+ float fDecodedAlpha = DecodePixelAlpha(fBase, fMultiplier, uiTableEntry, uiSelector);
+
+ // border pixels (NAN) should have zero error
+ float fPixelDeltaAlpha = isnan(m_pafrgbaSource[uiPixel].fA) ?
+ 0.0f :
+ fDecodedAlpha - m_pafrgbaSource[uiPixel].fA;
+
+ float fPixelAlphaError = fPixelDeltaAlpha * fPixelDeltaAlpha;
+
+ if (fPixelAlphaError < fBestPixelAlphaError)
+ {
+ fBestPixelAlphaError = fPixelAlphaError;
+ auiBestSelectors[uiPixel] = uiSelector;
+ afBestAlphaError[uiPixel] = fBestPixelAlphaError;
+ afBestDecodedAlphas[uiPixel] = fDecodedAlpha;
+ }
+ }
+ }
+
+ float fBlockError = 0.0f;
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ fBlockError += afBestAlphaError[uiPixel];
+ }
+
+ if (fBlockError < m_fError)
+ {
+ m_fError = fBlockError;
+
+ m_fBase = fBase;
+ m_fMultiplier = fMultiplier;
+ m_uiModifierTableIndex = uiTableEntry;
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ m_auiAlphaSelectors[uiPixel] = auiBestSelectors[uiPixel];
+ m_afDecodedAlphas[uiPixel] = afBestDecodedAlphas[uiPixel];
+ }
+ }
+ }
+ }
+
+ }
+
+ }
+
+ // ----------------------------------------------------------------------------------------------------
+ // set the encoding bits based on encoding state
+ //
+ void Block4x4Encoding_RGBA8::SetEncodingBits(void)
+ {
+
+ // set the RGB8 portion
+ Block4x4Encoding_RGB8::SetEncodingBits();
+
+ // set the A8 portion
+ {
+ m_pencodingbitsA8->data.base = (unsigned char)roundf(255.0f * m_fBase);
+ m_pencodingbitsA8->data.table = m_uiModifierTableIndex;
+ m_pencodingbitsA8->data.multiplier = (unsigned char)roundf(m_fMultiplier);
+
+ 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_auiAlphaSelectors[uiPixel]) << uiShift;
+ }
+
+ m_pencodingbitsA8->data.selectors0 = ulliSelectorBits >> 40;
+ m_pencodingbitsA8->data.selectors1 = ulliSelectorBits >> 32;
+ m_pencodingbitsA8->data.selectors2 = ulliSelectorBits >> 24;
+ m_pencodingbitsA8->data.selectors3 = ulliSelectorBits >> 16;
+ m_pencodingbitsA8->data.selectors4 = ulliSelectorBits >> 8;
+ m_pencodingbitsA8->data.selectors5 = ulliSelectorBits;
+ }
+
+ }
+
+ // ####################################################################################################
+ // Block4x4Encoding_RGBA8_Opaque
+ // ####################################################################################################
+
+ // ----------------------------------------------------------------------------------------------------
+ // 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_RGBA8_Opaque::PerformIteration(float a_fEffort)
+ {
+ assert(!m_boolDone);
+
+ if (m_uiEncodingIterations == 0)
+ {
+ m_fError = 0.0f;
+
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ m_afDecodedAlphas[uiPixel] = 1.0f;
+ }
+ }
+
+ Block4x4Encoding_RGB8::PerformIteration(a_fEffort);
+
+ }
+
+ // ----------------------------------------------------------------------------------------------------
+ // set the encoding bits based on encoding state
+ //
+ void Block4x4Encoding_RGBA8_Opaque::SetEncodingBits(void)
+ {
+
+ // set the RGB8 portion
+ Block4x4Encoding_RGB8::SetEncodingBits();
+
+ // set the A8 portion
+ m_pencodingbitsA8->data.base = 255;
+ m_pencodingbitsA8->data.table = 15;
+ m_pencodingbitsA8->data.multiplier = 15;
+ m_pencodingbitsA8->data.selectors0 = 0xFF;
+ m_pencodingbitsA8->data.selectors1 = 0xFF;
+ m_pencodingbitsA8->data.selectors2 = 0xFF;
+ m_pencodingbitsA8->data.selectors3 = 0xFF;
+ m_pencodingbitsA8->data.selectors4 = 0xFF;
+ m_pencodingbitsA8->data.selectors5 = 0xFF;
+
+ }
+
+ // ####################################################################################################
+ // Block4x4Encoding_RGBA8_Transparent
+ // ####################################################################################################
+
+ // ----------------------------------------------------------------------------------------------------
+ // 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_RGBA8_Transparent::PerformIteration(float )
+ {
+ assert(!m_boolDone);
+ assert(m_uiEncodingIterations == 0);
+
+ m_mode = MODE_ETC1;
+ m_boolDiff = true;
+ m_boolFlip = false;
+
+ for (unsigned int uiPixel = 0; uiPixel < PIXELS; uiPixel++)
+ {
+ m_afrgbaDecodedColors[uiPixel] = ColorFloatRGBA();
+ m_afDecodedAlphas[uiPixel] = 0.0f;
+ }
+
+ m_fError = 0.0f;
+
+ m_boolDone = true;
+ m_uiEncodingIterations++;
+
+ }
+
+ // ----------------------------------------------------------------------------------------------------
+ // set the encoding bits based on encoding state
+ //
+ void Block4x4Encoding_RGBA8_Transparent::SetEncodingBits(void)
+ {
+
+ Block4x4Encoding_RGB8::SetEncodingBits();
+
+ // set the A8 portion
+ m_pencodingbitsA8->data.base = 0;
+ m_pencodingbitsA8->data.table = 0;
+ m_pencodingbitsA8->data.multiplier = 1;
+ m_pencodingbitsA8->data.selectors0 = 0;
+ m_pencodingbitsA8->data.selectors1 = 0;
+ m_pencodingbitsA8->data.selectors2 = 0;
+ m_pencodingbitsA8->data.selectors3 = 0;
+ m_pencodingbitsA8->data.selectors4 = 0;
+ m_pencodingbitsA8->data.selectors5 = 0;
+
+ }
+
+ // ----------------------------------------------------------------------------------------------------
+ //
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-24 23:56:32 +0000