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101 lines
3 KiB
C++
101 lines
3 KiB
C++
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// NeL - MMORPG Framework <http://dev.ryzom.com/projects/nel/>
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// Copyright (C) 2010 Winch Gate Property Limited
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as
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// published by the Free Software Foundation, either version 3 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include "std3d.h"
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#include "nel/3d/ps_attrib_maker_template.h"
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#include "nel/misc/system_info.h"
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namespace NL3D
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{
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void computeGradient(const NLMISC::CRGBA *valueTab, uint32 numValues, uint32 nbStages, CPSVector<NLMISC::CRGBA>::V &grad, NLMISC::CRGBA &minValue, NLMISC::CRGBA &maxValue)
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{
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nlassert(numValues > 1);
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nlassert(nbStages > 0);
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maxValue = minValue = valueTab[0];
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uint nbValues = (numValues - 1) * nbStages;
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grad.resize(nbValues + 1);
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float step = 1.0f / float(nbStages);
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float alpha;
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NLMISC::CRGBA *dest = &grad[0];
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#if defined(NL_OS_WINDOWS) && !defined(NL_NO_ASM)
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float stepX127 = 127.f * step;
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if (NLMISC::CSystemInfo::hasMMX())
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{
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// do interpolation using mmx
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for (uint32 k = 0; k < (numValues - 1); ++k)
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{
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uint32 col0 = *(uint32 *) &valueTab[k];
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uint64 stepPacked;
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sint16 *step = (sint16 *) &stepPacked;
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step[0] = (sint16) (stepX127 * (valueTab[k + 1].R - valueTab[k].R));
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step[1] = (sint16) (stepX127 * (valueTab[k + 1].G - valueTab[k].G));
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step[2] = (sint16) (stepX127 * (valueTab[k + 1].B - valueTab[k].B));
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step[3] = (sint16) (stepX127 * (valueTab[k + 1].A - valueTab[k].A));
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__asm
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{
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pxor mm0, mm0 // mm0 = 0
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movd mm1, col0
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punpcklbw mm0, mm1 // store current col in mm0, each component is stored in 7:8 fixed integer
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psrlw mm0, 1
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movq mm2, stepPacked // store step for gradient
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mov edi, dest
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mov eax, 4
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mov ecx, nbStages
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sub edi, eax
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myLoop:
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// unpack current color
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movq mm1, mm0
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add edi, eax // advance destination
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psrlw mm1, 7
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packuswb mm1, mm1
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movd [edi], mm1 // store result
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paddsw mm0, mm2 // increment color
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dec ecx
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jne myLoop
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emms
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}
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dest += nbStages;
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}
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}
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else
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#endif
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{
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// copy the tab performing linear interpolation between values given in parameter
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for (uint32 k = 0; k < (numValues - 1); ++k)
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{
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alpha = 0;
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for(uint32 l = 0; l < nbStages; ++l)
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{
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// use the right version of the template function PSValueBlend
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// to do the job
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*dest++ = PSValueBlend(valueTab[k], valueTab[k + 1], alpha);
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alpha += step;
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}
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}
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}
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*dest = valueTab[numValues - 1];
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}
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}
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