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windows-nt/Source/XPSP1/NT/multimedia/directx/dxg/ref8/rast/texfilt.cpp

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2020-09-26 03:20:57 -05:00
///////////////////////////////////////////////////////////////////////////////
// Copyright (C) Microsoft Corporation, 2000.
//
// texfilt.cpp
//
// Direct3D Reference Device - Texture Map Filtering Methods
//
///////////////////////////////////////////////////////////////////////////////
#include "pch.cpp"
#pragma hdrstop
void
RefRast::UpdateTextureControls( void )
{
for (int iStage=0; iStage<m_pRD->m_cActiveTextureStages; iStage++)
{
// check for requirement to do level-of-detail (coverage) computation - either
// for mipmap or per-pixel filter selection
BOOL bComputeLOD =
( m_pRD->GetTSS(iStage)[D3DTSS_MIPFILTER] == D3DTEXF_POINT ) ||
( m_pRD->GetTSS(iStage)[D3DTSS_MIPFILTER] == D3DTEXF_LINEAR ) ||
( m_pRD->GetTSS(iStage)[D3DTSS_MAGFILTER] != m_pRD->GetTSS(iStage)[D3DTSS_MINFILTER] );
// check for anisotropic filtering in either mag filter or in min filter
BOOL bDoAniso =
( D3DTEXF_ANISOTROPIC == m_pRD->GetTSS(iStage)[D3DTSS_MAGFILTER] ) ||
( bComputeLOD && (D3DTEXF_ANISOTROPIC == m_pRD->GetTSS(iStage)[D3DTSS_MINFILTER]) );
// compute filter type for coverage computation
if (bDoAniso) m_TexFlt[iStage].CvgFilter = D3DTEXF_ANISOTROPIC;
else if (bComputeLOD) m_TexFlt[iStage].CvgFilter = D3DTEXF_LINEAR;
else m_TexFlt[iStage].CvgFilter = D3DTEXF_NONE;
// compute filter type for magnify (also used for non-LOD case)
switch ( m_pRD->GetTSS(iStage)[D3DTSS_MAGFILTER] )
{
default:
case D3DTEXF_POINT: m_TexFlt[iStage].MagFilter = D3DTEXF_POINT; break;
case D3DTEXF_FLATCUBIC:
case D3DTEXF_GAUSSIANCUBIC:
case D3DTEXF_LINEAR: m_TexFlt[iStage].MagFilter = D3DTEXF_LINEAR; break;
case D3DTEXF_ANISOTROPIC: m_TexFlt[iStage].MagFilter = D3DTEXF_ANISOTROPIC; break;
}
// compute filter type(s) for minify
switch ( m_pRD->GetTSS(iStage)[D3DTSS_MINFILTER] )
{
default:
case D3DTEXF_POINT: m_TexFlt[iStage].MinFilter = D3DTEXF_POINT; break;
case D3DTEXF_LINEAR: m_TexFlt[iStage].MinFilter = D3DTEXF_LINEAR; break;
case D3DTEXF_ANISOTROPIC: m_TexFlt[iStage].MinFilter = D3DTEXF_ANISOTROPIC; break;
}
switch ( m_pRD->GetTSS(iStage)[D3DTSS_MIPFILTER] )
{
default:
case D3DTEXF_NONE: m_TexFlt[iStage].MipFilter = D3DTEXF_NONE; break;
case D3DTEXF_POINT: m_TexFlt[iStage].MipFilter = D3DTEXF_POINT; break;
case D3DTEXF_LINEAR: m_TexFlt[iStage].MipFilter = D3DTEXF_LINEAR; break;
}
// set default state
m_TexCvg[iStage].fLOD = 0.f;
m_TexCvg[iStage].iLOD = 0;
m_TexCvg[iStage].iLODMap[0] = 0;
m_TexCvg[iStage].iLODMap[1] = 0;
m_TexCvg[iStage].fLODFrc[0] = 1.f;
m_TexCvg[iStage].fLODFrc[1] = 1.f;
m_TexCvg[iStage].bMagnify = FALSE;
m_TexCvg[iStage].cLOD = 1;
}
}
//
// called once per each set of 2x2 samples
//
void
RefRast::ComputeTextureCoverage( int iStage, FLOAT (*fGradients)[2] )
{
if ( !m_pRD->m_pTexture[iStage] ) return;
if ( m_pRD->m_pTexture[iStage]->m_uFlags & RR_TEXTURE_CUBEMAP )
{
// store gradients for cubemaps
memcpy( m_TexCvg[iStage].fGradients, fGradients, 3*2*sizeof(FLOAT) );
return;
}
if ( D3DTEXF_NONE == m_TexFlt[iStage].CvgFilter ) return;
// scale gradients to texture LOD 0 size
for (int iD=0; iD < m_pRD->m_pTexture[iStage]->m_cDimension; iD++ )
{
fGradients[iD][0] *= m_pRD->m_pTexture[iStage]->m_fTexels[0][iD];
fGradients[iD][1] *= m_pRD->m_pTexture[iStage]->m_fTexels[0][iD];
}
if ( (m_TexFlt[iStage].CvgFilter == D3DTEXF_ANISOTROPIC) &&
(m_pRD->m_pTexture[iStage]->m_cDimension == 2) ) // do aniso for 2D textures only
{
ComputeAnisoCoverage( fGradients, MIN( 16.f, (FLOAT)m_pRD->GetTSS(iStage)[D3DTSS_MAXANISOTROPY]),
m_TexCvg[iStage].fLOD, m_TexCvg[iStage].fAnisoRatio, m_TexCvg[iStage].fAnisoLine );
}
else
{
ComputeMipCoverage( fGradients, m_TexCvg[iStage].fLOD, m_pRD->m_pTexture[iStage]->m_cDimension );
m_TexCvg[iStage].fAnisoRatio = 1.f;
}
ComputePerLODControls( iStage );
}
//
// called by ComputeTextureCoverage and ComputeCubeTextureFilter
//
void
RefRast::ComputePerLODControls( int iStage )
{
m_TexCvg[iStage].fLOD += m_pRD->GetTSSf(iStage)[D3DTSS_MIPMAPLODBIAS];
m_TexCvg[iStage].iLOD = AS_INT16( m_TexCvg[iStage].fLOD + FLOAT_5_SNAP );
m_TexCvg[iStage].bMagnify = (m_TexCvg[iStage].iLOD <= 0);
m_TexCvg[iStage].cLOD = 1;
m_TexCvg[iStage].fLODFrc[0] = 1.f;
if ( m_TexCvg[iStage].bMagnify || ( m_TexFlt[iStage].MipFilter == D3DTEXF_NONE ) )
{
m_TexCvg[iStage].iLODMap[0] = 0;
// clamp to max LOD
m_TexCvg[iStage].iLODMap[0] = MAX( m_TexCvg[iStage].iLODMap[0], (INT32)m_pRD->GetTSS(iStage)[D3DTSS_MAXMIPLEVEL] );
// clamp to available maps
m_TexCvg[iStage].iLODMap[0] = MIN( m_TexCvg[iStage].iLODMap[0], (INT32)m_pRD->m_pTexture[iStage]->m_cLOD );
}
else if ( m_TexFlt[iStage].MipFilter == D3DTEXF_POINT )
{
// round and truncate (add .5 and shift off fractional bits)
m_TexCvg[iStage].iLODMap[0] = (m_TexCvg[iStage].iLOD + (1<<(RRTEX_LODFRAC-1))) >> RRTEX_LODFRAC;
// clamp to max LOD
m_TexCvg[iStage].iLODMap[0] = MAX( m_TexCvg[iStage].iLODMap[0], (INT32)m_pRD->GetTSS(iStage)[D3DTSS_MAXMIPLEVEL] );
// clamp to available maps
m_TexCvg[iStage].iLODMap[0] = MIN( m_TexCvg[iStage].iLODMap[0], (INT32)m_pRD->m_pTexture[iStage]->m_cLOD );
}
else // mip filter D3DTEXF_LINEAR
{
// compute index for two adjacent LODs
m_TexCvg[iStage].iLODMap[0] = m_TexCvg[iStage].iLOD >> RRTEX_LODFRAC; // floor
m_TexCvg[iStage].iLODMap[1] = m_TexCvg[iStage].iLODMap[0] + 1;
// clamp to max LOD
m_TexCvg[iStage].iLODMap[0] = MAX( m_TexCvg[iStage].iLODMap[0], (INT32)m_pRD->GetTSS(iStage)[D3DTSS_MAXMIPLEVEL] );
m_TexCvg[iStage].iLODMap[1] = MAX( m_TexCvg[iStage].iLODMap[1], (INT32)m_pRD->GetTSS(iStage)[D3DTSS_MAXMIPLEVEL] );
// clamp to available maps
m_TexCvg[iStage].iLODMap[0] = MIN( m_TexCvg[iStage].iLODMap[0], (INT32)m_pRD->m_pTexture[iStage]->m_cLOD );
m_TexCvg[iStage].iLODMap[1] = MIN( m_TexCvg[iStage].iLODMap[1], (INT32)m_pRD->m_pTexture[iStage]->m_cLOD );
// check that both maps actually contribute to texel
if ( (m_TexCvg[iStage].iLODMap[0] != m_TexCvg[iStage].iLODMap[1]) &&
(m_TexCvg[iStage].iLOD & RRTEX_LODFRACMASK) )
{
m_TexCvg[iStage].fLODFrc[1] = (FLOAT)(m_TexCvg[iStage].iLOD & RRTEX_LODFRACMASK) * RRTEX_LODFRACF;
m_TexCvg[iStage].fLODFrc[0] = 1.f - m_TexCvg[iStage].fLODFrc[1];
m_TexCvg[iStage].cLOD = 2;
}
}
}
void
RefRast::ComputePointSampleCoords(
int iStage, INT32 iLOD, FLOAT fCrd[],
INT32 iCrd[] )
{
for (int iD=0; iD<m_pRD->m_pTexture[iStage]->m_cDimension; iD++)
{
FLOAT fScaledCrd =
( fCrd[iD] * m_pRD->m_pTexture[iStage]->m_fTexels[iLOD][iD] ) - .5f;
// truncate to -infinity to be compatible with ANDing off low order
// bits of a fixed point fScaledCoord. This makes the generation of
// iCoord more hardware like, and does not make a glitch at 0 for
// a wrapped texture.
if ( fCrd[iD] >= 0.f ) iCrd[iD] = (INT32)( fScaledCrd + .5f );
else iCrd[iD] = (INT32)( fScaledCrd - .5f );
}
}
void
RefRast::ComputeLinearSampleCoords(
int iStage, INT32 iLOD, FLOAT fCrd[],
INT32 iCrdFlr[], INT32 iCrdClg[], FLOAT fCrdFrcF[], FLOAT fCrdFrcC[] )
{
for (int iD=0; iD<m_pRD->m_pTexture[iStage]->m_cDimension; iD++)
{
FLOAT fScaledCrd =
( fCrd[iD] * m_pRD->m_pTexture[iStage]->m_fTexels[iLOD][iD] ) - .5f;
INT32 iCrd = FloatToNdot5(fScaledCrd);
iCrdFlr[iD] = iCrd >> RRTEX_MAPFRAC;
iCrdClg[iD] = iCrdFlr[iD] + 1;
fCrdFrcC[iD] = (FLOAT)(iCrd & RRTEX_MAPFRACMASK) * RRTEX_MAPFRACF;
fCrdFrcF[iD] = 1.f - fCrdFrcC[iD];
}
}
void
RefRast::SetUp1DTextureSample(
int iStage, int Start,
INT32 iLODMap, FLOAT fLODScale,
INT32 iCrdF, INT32 iCrdC,
FLOAT fCrdFrcF, FLOAT fCrdFrcC )
{
m_TexFlt[iStage].pSamples[Start+0].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+1].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+0].iCrd[0] = iCrdF;
m_TexFlt[iStage].pSamples[Start+1].iCrd[0] = iCrdC;
m_TexFlt[iStage].pSamples[Start+0].fWgt = fCrdFrcF*fLODScale;
m_TexFlt[iStage].pSamples[Start+1].fWgt = fCrdFrcC*fLODScale;
}
#define _Set2( _DstAr, _Src0, _Src1 ) \
_DstAr[0] = _Src0; _DstAr[1] = _Src1;
void
RefRast::SetUp2DTextureSample(
int iStage, int Start,
INT32 iLODMap, FLOAT fLODScale,
INT32 iCrdF[], INT32 iCrdC[],
FLOAT fCrdFrcF[], FLOAT fCrdFrcC[] )
{
m_TexFlt[iStage].pSamples[Start+0].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+1].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+2].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+3].iLOD = iLODMap;
_Set2( m_TexFlt[iStage].pSamples[Start+0].iCrd, iCrdF[0], iCrdF[1] )
_Set2( m_TexFlt[iStage].pSamples[Start+1].iCrd, iCrdC[0], iCrdF[1] )
_Set2( m_TexFlt[iStage].pSamples[Start+2].iCrd, iCrdC[0], iCrdC[1] )
_Set2( m_TexFlt[iStage].pSamples[Start+3].iCrd, iCrdF[0], iCrdC[1] )
m_TexFlt[iStage].pSamples[Start+0].fWgt = fCrdFrcF[0] * fCrdFrcF[1] * fLODScale;
m_TexFlt[iStage].pSamples[Start+1].fWgt = fCrdFrcC[0] * fCrdFrcF[1] * fLODScale;
m_TexFlt[iStage].pSamples[Start+2].fWgt = fCrdFrcC[0] * fCrdFrcC[1] * fLODScale;
m_TexFlt[iStage].pSamples[Start+3].fWgt = fCrdFrcF[0] * fCrdFrcC[1] * fLODScale;
}
#define _Set3( _DstAr, _Src0, _Src1, _Src2 ) \
_DstAr[0] = _Src0; _DstAr[1] = _Src1; _DstAr[2] = _Src2;
void
RefRast::SetUp3DTextureSample(
int iStage, int Start,
INT32 iLODMap, FLOAT fLODScale,
INT32 iCrdF[], INT32 iCrdC[],
FLOAT fCrdFrcF[], FLOAT fCrdFrcC[] )
{
m_TexFlt[iStage].pSamples[Start+0].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+1].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+2].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+3].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+4].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+5].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+6].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+7].iLOD = iLODMap;
m_TexFlt[iStage].pSamples[Start+0].fWgt = fCrdFrcF[0] * fCrdFrcF[1] * fCrdFrcF[2] * fLODScale;
m_TexFlt[iStage].pSamples[Start+1].fWgt = fCrdFrcC[0] * fCrdFrcF[1] * fCrdFrcF[2] * fLODScale;
m_TexFlt[iStage].pSamples[Start+2].fWgt = fCrdFrcC[0] * fCrdFrcC[1] * fCrdFrcF[2] * fLODScale;
m_TexFlt[iStage].pSamples[Start+3].fWgt = fCrdFrcF[0] * fCrdFrcC[1] * fCrdFrcF[2] * fLODScale;
m_TexFlt[iStage].pSamples[Start+4].fWgt = fCrdFrcF[0] * fCrdFrcF[1] * fCrdFrcC[2] * fLODScale;
m_TexFlt[iStage].pSamples[Start+5].fWgt = fCrdFrcC[0] * fCrdFrcF[1] * fCrdFrcC[2] * fLODScale;
m_TexFlt[iStage].pSamples[Start+6].fWgt = fCrdFrcC[0] * fCrdFrcC[1] * fCrdFrcC[2] * fLODScale;
m_TexFlt[iStage].pSamples[Start+7].fWgt = fCrdFrcF[0] * fCrdFrcC[1] * fCrdFrcC[2] * fLODScale;
_Set3( m_TexFlt[iStage].pSamples[Start+0].iCrd, iCrdF[0], iCrdF[1], iCrdF[2] )
_Set3( m_TexFlt[iStage].pSamples[Start+1].iCrd, iCrdC[0], iCrdF[1], iCrdF[2] )
_Set3( m_TexFlt[iStage].pSamples[Start+2].iCrd, iCrdC[0], iCrdC[1], iCrdF[2] )
_Set3( m_TexFlt[iStage].pSamples[Start+3].iCrd, iCrdF[0], iCrdC[1], iCrdF[2] )
_Set3( m_TexFlt[iStage].pSamples[Start+4].iCrd, iCrdF[0], iCrdF[1], iCrdC[2] )
_Set3( m_TexFlt[iStage].pSamples[Start+5].iCrd, iCrdC[0], iCrdF[1], iCrdC[2] )
_Set3( m_TexFlt[iStage].pSamples[Start+6].iCrd, iCrdC[0], iCrdC[1], iCrdC[2] )
_Set3( m_TexFlt[iStage].pSamples[Start+7].iCrd, iCrdF[0], iCrdC[1], iCrdC[2] )
}
//
// called once for each pixel
//
void
RefRast::ComputeTextureFilter( int iStage, FLOAT fCrd[] )
{
m_TexFlt[iStage].cSamples = 0;
if ( !m_pRD->m_pTexture[iStage] ) return;
if ( m_pRD->m_pTexture[iStage]->m_uFlags & RR_TEXTURE_CUBEMAP )
{
ComputeCubeTextureFilter( iStage, fCrd );
return;
}
// here for 1,2,3D texture
int iL,iD;
#define _PerDimension(_Par) for (_Par=0;_Par<m_pRD->m_pTexture[iStage]->m_cDimension;_Par++)
D3DTEXTUREFILTERTYPE Filter =
m_TexCvg[iStage].bMagnify ? m_TexFlt[iStage].MagFilter : m_TexFlt[iStage].MinFilter;
switch ( Filter )
{
default:
case D3DTEXF_POINT:
for ( iL = 0; iL < m_TexCvg[iStage].cLOD; iL++ )
{
m_TexFlt[iStage].pSamples[m_TexFlt[iStage].cSamples].iLOD = m_TexCvg[iStage].iLODMap[iL];
m_TexFlt[iStage].pSamples[m_TexFlt[iStage].cSamples].fWgt = m_TexCvg[iStage].fLODFrc[iL];
ComputePointSampleCoords( iStage, m_TexCvg[iStage].iLODMap[iL], fCrd,
m_TexFlt[iStage].pSamples[m_TexFlt[iStage].cSamples].iCrd );
m_TexFlt[iStage].cSamples++;
}
break;
case D3DTEXF_LINEAR:
for ( iL = 0; iL < m_TexCvg[iStage].cLOD; iL++ )
{
INT32 iCrdFlr[3], iCrdClg[3];
FLOAT fCrdFrcF[3], fCrdFrcC[3];
ComputeLinearSampleCoords(
iStage, m_TexCvg[iStage].iLODMap[iL], fCrd,
iCrdFlr, iCrdClg, fCrdFrcF, fCrdFrcC );
switch ( m_pRD->m_pTexture[iStage]->m_cDimension )
{
default:
case 1:
SetUp1DTextureSample( iStage, m_TexFlt[iStage].cSamples, m_TexCvg[iStage].iLODMap[iL], m_TexCvg[iStage].fLODFrc[iL],
iCrdFlr[0], iCrdClg[0], fCrdFrcF[0], fCrdFrcC[0] );
m_TexFlt[iStage].cSamples += 2;
break;
case 2:
SetUp2DTextureSample( iStage, m_TexFlt[iStage].cSamples, m_TexCvg[iStage].iLODMap[iL], m_TexCvg[iStage].fLODFrc[iL],
iCrdFlr, iCrdClg, fCrdFrcF, fCrdFrcC );
m_TexFlt[iStage].cSamples += 4;
break;
case 3:
SetUp3DTextureSample( iStage, m_TexFlt[iStage].cSamples, m_TexCvg[iStage].iLODMap[iL], m_TexCvg[iStage].fLODFrc[iL],
iCrdFlr, iCrdClg, fCrdFrcF, fCrdFrcC );
m_TexFlt[iStage].cSamples += 8;
break;
}
}
break;
case D3DTEXF_ANISOTROPIC:
for ( iL = 0; iL < m_TexCvg[iStage].cLOD; iL++ )
{
FLOAT fStepScale[3];
fStepScale[0] = 1.f/m_pRD->m_pTexture[iStage]->m_fTexels[m_TexCvg[iStage].iLODMap[iL]][0];
fStepScale[1] = 1.f/m_pRD->m_pTexture[iStage]->m_fTexels[m_TexCvg[iStage].iLODMap[iL]][1];
fStepScale[2] = 0.f;
FLOAT fUnitStep[3];
_PerDimension(iD) { fUnitStep[iD] = fStepScale[iD]*m_TexCvg[iStage].fAnisoLine[iD]; }
int cAnisoSamples;
FLOAT fACrd[16][3];
FLOAT fAScale[16];
if ( m_TexCvg[iStage].fAnisoRatio <= 1.f )
{
// just like mip D3DTEXF_LINEAR
cAnisoSamples = 1; fAScale[0] = 1.f;
_PerDimension(iD) { fACrd[0][iD] = fCrd[iD]; }
}
else if ( m_TexCvg[iStage].fAnisoRatio <= 2.f )
{
// take two sets of samples and average
cAnisoSamples = 2; fAScale[0] = fAScale[1] = .5f;
FLOAT fStepSize = .5f*(m_TexCvg[iStage].fAnisoRatio - 1.f);
_PerDimension(iD)
{
FLOAT fStep = fStepSize*fUnitStep[iD];
fACrd[0][iD] = fCrd[iD] + fStep;
fACrd[1][iD] = fCrd[iD] - fStep;
}
}
else
{
// walk line of anisotropy in both directions from center point
FLOAT fInvRatio = 1.f/m_TexCvg[iStage].fAnisoRatio;
FLOAT fRatioRemainder = m_TexCvg[iStage].fAnisoRatio;
// start steps centered 1/2 away
_PerDimension(iD)
{
fACrd[0][iD] = fCrd[iD] + fUnitStep[iD]*.5f;
fACrd[1][iD] = fCrd[iD] - fUnitStep[iD]*.5f;
}
cAnisoSamples = 0;
do
{
fAScale[cAnisoSamples+0] = fInvRatio;
fAScale[cAnisoSamples+1] = fInvRatio;
if ( fRatioRemainder < 2.f )
{
fAScale[cAnisoSamples+0] *= .5f*fRatioRemainder;
fAScale[cAnisoSamples+1] *= .5f*fRatioRemainder;
}
if ( fRatioRemainder > 2.f )
{
_PerDimension(iD)
{
fACrd[cAnisoSamples+2][iD] = fACrd[cAnisoSamples+0][iD] + fUnitStep[iD];
fACrd[cAnisoSamples+3][iD] = fACrd[cAnisoSamples+1][iD] - fUnitStep[iD];
}
}
cAnisoSamples += 2;
fRatioRemainder -= 2.f;
}
while ( fRatioRemainder > 0.f );
}
for ( int iS = 0; iS < cAnisoSamples; iS ++ )
{
INT32 iCrdFlr[3], iCrdClg[3];
FLOAT fCrdFrcF[3], fCrdFrcC[3];
ComputeLinearSampleCoords(
iStage, m_TexCvg[iStage].iLODMap[iL], fACrd[iS],
iCrdFlr, iCrdClg, fCrdFrcF, fCrdFrcC );
FLOAT fSampleScale = fAScale[iS]*m_TexCvg[iStage].fLODFrc[iL];
switch ( m_pRD->m_pTexture[iStage]->m_cDimension )
{
default:
case 1:
SetUp1DTextureSample( iStage, m_TexFlt[iStage].cSamples, m_TexCvg[iStage].iLODMap[iL], fSampleScale,
iCrdFlr[0], iCrdClg[0], fCrdFrcF[0], fCrdFrcC[0] );
m_TexFlt[iStage].cSamples += 2;
break;
case 2:
SetUp2DTextureSample( iStage, m_TexFlt[iStage].cSamples, m_TexCvg[iStage].iLODMap[iL], fSampleScale,
iCrdFlr, iCrdClg, fCrdFrcF, fCrdFrcC );
m_TexFlt[iStage].cSamples += 4;
break;
case 3:
SetUp3DTextureSample( iStage, m_TexFlt[iStage].cSamples, m_TexCvg[iStage].iLODMap[iL], fSampleScale,
iCrdFlr, iCrdClg, fCrdFrcF, fCrdFrcC );
m_TexFlt[iStage].cSamples += 8;
break;
}
}
}
break;
}
}
const DWORD g_D3DTSS_ADDRESS_MAP[3] = { D3DTSS_ADDRESSU, D3DTSS_ADDRESSV, D3DTSS_ADDRESSW };
void
RefRast::SampleTexture( INT32 iStage, FLOAT fCol[] )
{
if ( m_pRD->m_pTexture[iStage] == NULL )
{
// return opaque black if no texture bound
fCol[0] = fCol[1] = fCol[2] = 0.f;
fCol[3] = 1.f;
return;
}
fCol[0] = fCol[1] = fCol[2] = fCol[3] = 0.f;
TextureSample* pS = m_TexFlt[iStage].pSamples;
RDSurface2D* pTex = m_pRD->m_pTexture[iStage];
for (int iS = 0; iS < m_TexFlt[iStage].cSamples; iS++, pS++ )
{
if ( pS->fWgt )
{
BOOL bUseBorder = FALSE;
for (int iD=0; iD < pTex->m_cDimension; iD++)
{
INT32 iCrdMax = (pTex->m_cTexels[pS->iLOD][iD] - 1);
if ( ( pS->iCrd[iD] < 0) || ( pS->iCrd[iD] > iCrdMax ) )
{
switch ( m_pRD->GetTSS(iStage)[g_D3DTSS_ADDRESS_MAP[iD]] )
{
case D3DTADDRESS_WRAP:
// Pow-2 texture:
// pS->iCrd[iD] = pS->iCrd[iD] & iCrdMax;
// Non-Pow-2 texture:
pS->iCrd[iD] %= (iCrdMax + 1);
if( pS->iCrd[iD] < 0 )
pS->iCrd[iD] = iCrdMax + 1 + pS->iCrd[iD];
break;
case D3DTADDRESS_MIRROR:
// Pow-2 texture:
// lop off non-fractional bits + flip index if LSB (non-fraction) is set
// BOOL bFlip; bFlip = pS->iCrd[iD] & (iCrdMax+1);
// pS->iCrd[iD] &= iCrdMax;
// if (bFlip) { pS->iCrd[iD] = iCrdMax - pS->iCrd[iD]; }
// Non-Pow-2 texture:
if( pS->iCrd[iD] < 0 )
pS->iCrd[iD] = -pS->iCrd[iD] - 1;
BOOL bFlip; bFlip = ((pS->iCrd[iD]/(iCrdMax + 1)) & 1);
pS->iCrd[iD] %= (iCrdMax + 1);
if( bFlip ) pS->iCrd[iD] = iCrdMax - pS->iCrd[iD];
break;
case D3DTADDRESS_BORDER:
bUseBorder = TRUE;
break;
case D3DTADDRESS_MIRRORONCE:
if ( pS->iCrd[iD] < 0 ) pS->iCrd[iD] = (-pS->iCrd[iD]) - 1;
// fall through to clamp for outside of -1 to +1 range
case D3DTADDRESS_CLAMP:
pS->iCrd[iD] = MAX( 0, MIN( pS->iCrd[iD], iCrdMax ) );
break;
}
}
}
RDColor Texel;
(bUseBorder)
? Texel = m_pRD->GetTSS(iStage)[D3DTSS_BORDERCOLOR]
: pTex->ReadColor(
pS->iCrd[0], pS->iCrd[1], pS->iCrd[2], pS->iLOD,
Texel, m_bPixelDiscard[m_iPix] );
fCol[0] += ( Texel.R * pS->fWgt );
fCol[1] += ( Texel.G * pS->fWgt );
fCol[2] += ( Texel.B * pS->fWgt );
fCol[3] += ( Texel.A * pS->fWgt );
}
}
}
//-----------------------------------------------------------------------------
//
// Computes level of detail for standard trilinear mipmapping, in which
// the four texture index gradients are consolidated into a single number
// to select level of detail.
//
// The basic approach is to compute the lengths of the pixel coverage for
// the per-dimensional extent of the approximate pixel coverage area. The
// max of lengths are used for the single LOD result.
//
//-----------------------------------------------------------------------------
void
ComputeMipCoverage( const FLOAT (*fGradients)[2], FLOAT& fLOD, int cDim )
{
// compute length of coverage in each dimension
FLOAT fLen[2];
switch (cDim)
{
default:
case 1: fLOD = 0.f; return;
case 2:
fLen[0] = RR_LENGTH( fGradients[0][0], fGradients[1][0] );
fLen[1] = RR_LENGTH( fGradients[0][1], fGradients[1][1] );
break;
case 3:
fLen[0] = RR_SQRT(
(fGradients[0][0]*fGradients[0][0]) +
(fGradients[1][0]*fGradients[1][0]) +
(fGradients[2][0]*fGradients[2][0]) );
fLen[1] = RR_SQRT(
(fGradients[0][1]*fGradients[0][1]) +
(fGradients[1][1]*fGradients[1][1]) +
(fGradients[2][1]*fGradients[2][1]) );
break;
}
// take the MAX for the coverage
FLOAT fCoverage = MAX( fLen[0], fLen[1] );
// take log2 of coverage for LOD
fLOD = RR_LOG2(fCoverage);
}
//-----------------------------------------------------------------------------
//
// Computes level of detail and other factors in preparation for anisotropic
// filtering. This is for 2D texture maps only.
//
//-----------------------------------------------------------------------------
void
ComputeAnisoCoverage(
const FLOAT (*fGradients)[2], FLOAT fMaxAniso, // inputs
FLOAT& fLOD, FLOAT& fRatio, FLOAT fDelta[] ) // outputs
{
// compute axis lengths and determinant
FLOAT fLenX2 = (fGradients[0][0]*fGradients[0][0])+(fGradients[1][0]*fGradients[1][0]);
FLOAT fLenY2 = (fGradients[0][1]*fGradients[0][1])+(fGradients[1][1]*fGradients[1][1]);
FLOAT fDet = RR_ABSF((fGradients[0][0]*fGradients[1][1])-(fGradients[0][1]*fGradients[1][0]));
// select major axis
BOOL bXMajor = (fLenX2 > fLenY2);
// select and normalize steps; compute aniso ratio
FLOAT fMaj2 = (bXMajor) ? (fLenX2) : (fLenY2);
FLOAT fMaj = RR_SQRT(fMaj2);
FLOAT fMajNorm = 1./fMaj;
fDelta[0] = ( bXMajor ? fGradients[0][0] : fGradients[0][1] ) * fMajNorm;
fDelta[1] = ( bXMajor ? fGradients[1][0] : fGradients[1][1] ) * fMajNorm;
if( !FLOAT_EQZ(fDet) )
fRatio = fMaj2/fDet;
else
fRatio = FLT_MAX;
// clamp ratio and compute LOD
FLOAT fMin;
if ( fRatio > fMaxAniso )
{
// ratio is clamped - LOD is based on ratio (preserves area)
fRatio = fMaxAniso;
fMin = fMaj/fRatio;
}
else
{
// ratio not clamped - LOD is based on area
fMin = fDet/fMaj;
}
// clamp to top LOD
if (fMin < 1.0)
{
fRatio = MAX( 1.0, fRatio*fMin );
fMin = 1.0;
}
// take log2 of minor for LOD
fLOD = RR_LOG2(fMin);
}
// end
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