khanat-opennel-code/code/nel/src/3d/ps_attrib_maker_template.cpp

100 lines
3 KiB
C++

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