mirror of
https://github.com/yuzu-emu/FasTC.git
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257 lines
7.3 KiB
C++
257 lines
7.3 KiB
C++
/* FasTC
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* Copyright (c) 2013 University of North Carolina at Chapel Hill.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation for educational, research, and non-profit purposes, without
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* fee, and without a written agreement is hereby granted, provided that the
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* above copyright notice, this paragraph, and the following four paragraphs
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* appear in all copies.
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*
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* Permission to incorporate this software into commercial products may be
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* obtained by contacting the authors or the Office of Technology Development
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* at the University of North Carolina at Chapel Hill <otd@unc.edu>.
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*
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* This software program and documentation are copyrighted by the University of
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* North Carolina at Chapel Hill. The software program and documentation are
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* supplied "as is," without any accompanying services from the University of
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* North Carolina at Chapel Hill or the authors. The University of North
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* Carolina at Chapel Hill and the authors do not warrant that the operation of
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* the program will be uninterrupted or error-free. The end-user understands
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* that the program was developed for research purposes and is advised not to
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* rely exclusively on the program for any reason.
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*
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* IN NO EVENT SHALL THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL OR THE
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* AUTHORS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
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* OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING OUT OF THE USE OF
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* THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF NORTH CAROLINA
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* AT CHAPEL HILL OR THE AUTHORS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND THE AUTHORS SPECIFICALLY
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* DISCLAIM ANY WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ANY
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* STATUTORY WARRANTY OF NON-INFRINGEMENT. THE SOFTWARE PROVIDED HEREUNDER IS ON
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* AN "AS IS" BASIS, AND THE UNIVERSITY OF NORTH CAROLINA AT CHAPEL HILL AND
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* THE AUTHORS HAVE NO OBLIGATIONS TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
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* ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Please send all BUG REPORTS to <pavel@cs.unc.edu>.
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*
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* The authors may be contacted via:
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*
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* Pavel Krajcevski
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* Dept of Computer Science
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* 201 S Columbia St
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* Frederick P. Brooks, Jr. Computer Science Bldg
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* Chapel Hill, NC 27599-3175
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* USA
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*
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* <http://gamma.cs.unc.edu/FasTC/>
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*/
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#include "Block.h"
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#include <cassert>
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#include <cstring>
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namespace PVRTCC {
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Block::Block(const uint8 *data)
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: m_ColorACached(false)
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, m_ColorBCached(false) {
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assert(data);
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m_LongData = *(reinterpret_cast<const uint64 *>(data));
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}
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Pixel Block::GetColorA() {
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if(m_ColorACached) {
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return m_ColorA;
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}
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bool isOpaque = static_cast<bool>((m_LongData >> 63) & 0x1);
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const uint8 opaqueBitDepths[4] = { 0, 5, 5, 5 };
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const uint8 transBitDepths[4] = { 3, 4, 4, 4 };
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const uint8 *bitDepths = isOpaque? opaqueBitDepths : transBitDepths;
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uint8 pixelBytes[2];
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pixelBytes[0] = (m_LongData >> 56) & 0xFF;
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pixelBytes[1] = (m_LongData >> 48) & 0xFF;
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m_ColorA = Pixel(pixelBytes, bitDepths, 1);
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m_ColorACached = true;
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return m_ColorA;
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}
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Pixel Block::SetColor(const Pixel &c, bool transparent,
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const uint8 (&tbd)[4], const uint8 (&obd)[4]) {
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uint8 cDepth[4];
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c.GetBitDepth(cDepth);
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Pixel final = c;
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if(transparent) {
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final.ChangeBitDepth(tbd);
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// If we went effectively transparent, then just switch over to opaque...
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if(final.A() == 0x7) {
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return SetColor(c, false, tbd, obd);
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}
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} else {
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final.A() = 255;
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final.ChangeBitDepth(obd);
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}
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return final;
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}
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void Block::SetColorA(const Pixel &c, bool transparent) {
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const uint8 transparentBitDepth[4] = { 3, 4, 4, 4 };
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const uint8 opaqueBitDepth[4] = { 0, 5, 5, 5 };
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m_ColorA = SetColor(c, transparent, transparentBitDepth, opaqueBitDepth);
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m_ColorACached = true;
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}
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void Block::SetColorB(const Pixel &c, bool transparent) {
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const uint8 transparentBitDepth[4] = { 3, 4, 4, 3 };
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const uint8 opaqueBitDepth[4] = { 0, 5, 5, 4 };
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m_ColorB = SetColor(c, transparent, transparentBitDepth, opaqueBitDepth);
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m_ColorBCached = true;
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}
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Pixel Block::GetColorB() {
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if(m_ColorBCached) {
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return m_ColorB;
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}
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bool isOpaque = static_cast<bool>((m_LongData >> 47) & 0x1);
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const uint8 opaqueBitDepths[4] = { 0, 5, 5, 4 };
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const uint8 transBitDepths[4] = { 3, 4, 4, 3 };
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const uint8 *bitDepths = isOpaque? opaqueBitDepths : transBitDepths;
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uint8 pixelBytes[2];
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pixelBytes[0] = (m_LongData >> 40) & 0xFF;
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pixelBytes[1] = (m_LongData >> 32) & 0xFF;
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m_ColorB = Pixel(pixelBytes, bitDepths, 1);
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m_ColorBCached = true;
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return m_ColorB;
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}
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uint8 Block::GetLerpValue(uint32 texelIdx) const {
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assert(texelIdx >= 0);
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assert(texelIdx <= 15);
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return (m_LongData >> (texelIdx * 2)) & 0x3;
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}
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void Block::SetLerpValue(uint32 texelIdx, uint8 lerpVal) {
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assert(texelIdx >= 0);
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assert(texelIdx <= 15);
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assert(lerpVal >= 0);
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assert(lerpVal < 4);
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m_LongData &= ~(static_cast<uint64>(0x3) << (texelIdx * 2));
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m_LongData |= static_cast<uint64>(lerpVal & 0x3) << (texelIdx * 2);
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}
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Block::E2BPPSubMode Block::Get2BPPSubMode() const {
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uint8 first = GetLerpValue(0);
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if(!(first & 0x1)) {
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return e2BPPSubMode_All;
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}
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uint8 center = GetLerpValue(10);
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if(center & 0x1) {
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return e2BPPSubMode_Vertical;
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}
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return e2BPPSubMode_Horizontal;
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}
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uint8 Block::Get2BPPLerpValue(uint32 texelIdx) const {
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if(!(GetModeBit())) {
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assert(texelIdx >= 0);
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assert(texelIdx < 32);
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return static_cast<uint8>((m_LongData >> texelIdx) & 0x1);
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}
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bool firstBitOnly = false;
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if(texelIdx == 0 ||
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(texelIdx == 10 && Get2BPPSubMode() != e2BPPSubMode_All)) {
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firstBitOnly = true;
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}
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uint8 ret = GetLerpValue(texelIdx);
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if(firstBitOnly) {
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// Change 0, 1 => 0 and 2, 3 => 3
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ret = (ret & 0x2) | ((ret >> 1) & 0x1);
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}
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return ret;
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}
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uint64 Block::Pack() {
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assert(m_ColorACached);
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assert(m_ColorBCached);
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#ifndef NDEBUG
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uint8 bitDepthA[4];
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m_ColorA.GetBitDepth(bitDepthA);
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uint32 sumA = 0;
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for(int i = 0; i < 4; i++) {
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sumA += bitDepthA[i];
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}
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assert(sumA == 15);
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#endif
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#ifndef NDEBUG
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uint8 bitDepthB[4];
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m_ColorB.GetBitDepth(bitDepthB);
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uint32 sumB = 0;
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for(int i = 0; i < 4; i++) {
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sumB += bitDepthB[i];
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}
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assert(sumB == 14);
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#endif
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uint8 aBits[2], bBits[2];
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memset(aBits, 0, sizeof(aBits));
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memset(bBits, 0, sizeof(bBits));
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m_ColorA.ToBits(aBits, 2);
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m_ColorB.ToBits(bBits, 2, 1);
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if(m_ColorA.A() == 0xFF) {
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m_ByteData[7] |= 0x80;
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} else {
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m_ByteData[7] &= 0x7f;
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}
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m_ByteData[7] = aBits[1];
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m_ByteData[6] = aBits[0];
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bool modeBit = GetModeBit();
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m_ByteData[5] = bBits[1];
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m_ByteData[4] = bBits[0];
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if(m_ColorB.A() == 0xFF) {
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m_ByteData[5] |= 0x80;
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} else {
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m_ByteData[5] &= 0x7f;
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}
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if(modeBit) {
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m_ByteData[4] |= 0x1;
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} else {
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m_ByteData[4] &= 0xFE;
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}
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// Modulation data should have already been set...
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return m_LongData;
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}
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} // namespace PVRTCC
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