248 lines
8.1 KiB
C++
248 lines
8.1 KiB
C++
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///////////////////////////////////////////////////////////////////////////////
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// Copyright (C) Microsoft Corporation, 2000.
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//
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// rastattr.cpp
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//
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// Direct3D Reference Device -
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "pch.cpp"
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#pragma hdrstop
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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void RDAttribute::Init(
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RefRast* pRefRast, // RefRast with which this attrib is used
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UINT cDimensionality,
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BOOL bPerspective,
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BOOL bClamp )
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{
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m_pRR = pRefRast;
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m_cDimensionality = cDimensionality;
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m_bPerspective = bPerspective;
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m_bClamp = bClamp;
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m_cProjection = 0;
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m_dwWrapFlags = 0x0;
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m_bFlatShade = FALSE;
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// Sampling Routines
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//
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///////////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------------
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//
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// Sample - Sample attribute at given location.
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//
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//-----------------------------------------------------------------------------
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void RDAttribute::Sample(
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FLOAT* pSample,
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FLOAT fX,
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FLOAT fY,
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BOOL bNoProjectionOverride, // disables projection if TRUE
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BOOL bClampOverride) // enables (forces) clamp if TRUE
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{
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FLOAT fPScale = 1.0F;
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if (m_cProjection && !m_bFlatShade && !bNoProjectionOverride)
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{
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// note that perspective is already incorporated into projective coord
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fPScale = 1.0F/( fX*m_fA[m_cProjection] + fY*m_fB[m_cProjection] + m_fC[m_cProjection] );
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}
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else if (m_bPerspective && !m_bFlatShade)
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{
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fPScale = m_pRR->m_fW[m_pRR->m_iPix];
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}
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for ( UINT i=0; i<m_cDimensionality; i++)
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{
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if (m_bFlatShade)
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{
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*(pSample+i) = m_fC[i];
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}
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else
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{
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*(pSample+i) =
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fPScale * ( fX*m_fA[i] + fY*m_fB[i] + m_fC[i] );
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}
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if (m_bClamp || bClampOverride)
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{
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*(pSample+i) = MIN( 1.F, MAX( 0.F, *(pSample+i) ) );
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}
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}
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}
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//-----------------------------------------------------------------------------
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//
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// Sample - Sample scalar attribute at given location. Assumes no perspective
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// or projection. (Used for W or Depth.)
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//
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//-----------------------------------------------------------------------------
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FLOAT RDAttribute::Sample(
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FLOAT fX,
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FLOAT fY)
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{
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return fX*m_fA[0] + fY*m_fB[0] + m_fC[0];
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}
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///////////////////////////////////////////////////////////////////////////////
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//
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// Setup Routines
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//
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///////////////////////////////////////////////////////////////////////////////
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//-----------------------------------------------------------------------------
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//
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// WrapDiff - returns the difference (B-A) as defined under the D3D WRAPU/V
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// rules which is the shortest path between the two assuming a coincident
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// position at 1. and 0. The fA and fB input range is 0. to 1.
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//
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//-----------------------------------------------------------------------------
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static FLOAT
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WrapDiff( FLOAT fB, FLOAT fA )
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{
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// compute straight distance
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FLOAT fDist1 = fB - fA;
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// compute distance 'warping' between 0. and 1.
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FLOAT fDist2 = ( fDist1 < 0 ) ? ( fDist1+1 ) : ( fDist1-1 );
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// return minimum of these
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return ( fabs( fDist1) < fabs( fDist2) ) ? ( fDist1) : ( fDist2 );
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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void RDAttribute::Setup(
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const FLOAT* pVtx0, const FLOAT* pVtx1, const FLOAT* pVtx2)
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{
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if (m_pRR->m_bIsLine)
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{
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LineSetup( pVtx0, pVtx1, pVtx2 );
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return;
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}
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for ( UINT i=0; i<m_cDimensionality; i++)
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{
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FLOAT fVal0 = (pVtx0) ? (*(pVtx0+i)) : (0.);
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FLOAT fVal1 = (pVtx1) ? (*(pVtx1+i)) : (0.);
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FLOAT fVal2 = (pVtx2) ? (*(pVtx2+i)) : (0.);
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if (m_bFlatShade)
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{
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m_fA[i] = m_fB[i] = 0.F;
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switch ( m_pRR->m_iFlatVtx )
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{
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default:
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case 0: m_fC[i] = fVal0; break;
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case 1: m_fC[i] = fVal1; break;
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case 2: m_fC[i] = fVal2; break;
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}
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continue;
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}
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// extract wrap flag for this dimension
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BOOL bWrap = m_dwWrapFlags & (1<<i);
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// compute adjusted values for vertices 1,2 based on wrap flag
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FLOAT fVal1P = bWrap ? ( fVal0 + WrapDiff(fVal1,fVal0) ) : (fVal1);
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FLOAT fVal2P = bWrap ? ( fVal0 + WrapDiff(fVal2,fVal0) ) : (fVal2);
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// compute (maybe) perspective corrected linear deltas along two edges
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FLOAT fRHW0 = (m_bPerspective) ? (m_pRR->m_fRHW0) : (1.0F);
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FLOAT fRHW1 = (m_bPerspective) ? (m_pRR->m_fRHW1) : (1.0F);
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FLOAT fRHW2 = (m_bPerspective) ? (m_pRR->m_fRHW2) : (1.0F);
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FLOAT fDelAttrib10 = ( fVal1P * fRHW1 ) - ( fVal0 * fRHW0 );
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FLOAT fDelAttrib20 = ( fVal2P * fRHW2 ) - ( fVal0 * fRHW0 );
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// compute A & B terms (dVdX and dVdY)
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m_fA[i] = m_pRR->m_fTriOODet *
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( fDelAttrib10 * m_pRR->m_fDelY20 + fDelAttrib20 * m_pRR->m_fDelY01 );
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m_fB[i] = m_pRR->m_fTriOODet *
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( fDelAttrib20 * m_pRR->m_fDelX10 + fDelAttrib10 * m_pRR->m_fDelX02 );
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// compute C term (Fv = A*Xv + B*Yv + C => C = Fv - A*Xv - B*Yv)
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m_fC[i] = ( fVal0 * fRHW0 )
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- ( m_fA[i] * m_pRR->m_fX0 ) - ( m_fB[i] * m_pRR->m_fY0 );
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}
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}
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//-----------------------------------------------------------------------------
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//
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//-----------------------------------------------------------------------------
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void RDAttribute::LineSetup(
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const FLOAT* pVtx0, const FLOAT* pVtx1, const FLOAT* pVtxFlat)
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{
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for ( UINT i=0; i<m_cDimensionality; i++)
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{
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FLOAT fVal0 = (pVtx0) ? (*(pVtx0+i)) : (0.);
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FLOAT fVal1 = (pVtx1) ? (*(pVtx1+i)) : (0.);
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if (m_bFlatShade)
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{
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m_fA[i] = m_fB[i] = 0.F;
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m_fC[i] = (pVtxFlat) ? (*(pVtxFlat+i)) : fVal0;
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continue;
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}
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// extract wrap flag for this dimension
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BOOL bWrap = m_dwWrapFlags & (1<<i);
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// compute adjusted values for vertices 1,2 based on wrap flag
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FLOAT fVal1P = bWrap ? ( fVal0 + WrapDiff(fVal1,fVal0) ) : (fVal1);
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// compute (maybe) perspective corrected linear deltas along two edges
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FLOAT fRHW0 = (m_bPerspective) ? (m_pRR->m_fRHW0) : (1.0F);
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FLOAT fRHW1 = (m_bPerspective) ? (m_pRR->m_fRHW1) : (1.0F);
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FLOAT fDelta = ( fVal1P*fRHW1 - fVal0*fRHW0) / m_pRR->m_fLineMajorLength;
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m_fA[i] = ( m_pRR->m_bLineXMajor ) ? ( fDelta ) : ( 0. );
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m_fB[i] = ( m_pRR->m_bLineXMajor ) ? ( 0. ) : ( fDelta );
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// compute C term (Fv = A*Xv + B*Yv + C => C = Fv - A*Xv - B*Yv)
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m_fC[i] = ( fVal0* fRHW0)
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- ( m_fA[i] * m_pRR->m_fX0 ) - ( m_fB[i] * m_pRR->m_fY0 );
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}
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}
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//-----------------------------------------------------------------------------
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//
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// Setup attribute given packed DWORD color. Color format is that of the
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// colors in the FVF vertex, which corresponds to D3DFMT_A8R8G8B8 (and is
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// the same as D3DCOLOR).
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//
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//-----------------------------------------------------------------------------
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void RDAttribute::Setup(
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DWORD dwVtx0, DWORD dwVtx1, DWORD dwVtx2)
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{
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FLOAT fVtx0[4];
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FLOAT fVtx1[4];
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FLOAT fVtx2[4];
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fVtx0[0] = RGBA_GETRED( dwVtx0 ) * (1./255.);
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fVtx0[1] = RGBA_GETGREEN( dwVtx0 ) * (1./255.);
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fVtx0[2] = RGBA_GETBLUE( dwVtx0 ) * (1./255.);
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fVtx0[3] = RGBA_GETALPHA( dwVtx0 ) * (1./255.);
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fVtx1[0] = RGBA_GETRED( dwVtx1 ) * (1./255.);
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fVtx1[1] = RGBA_GETGREEN( dwVtx1 ) * (1./255.);
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fVtx1[2] = RGBA_GETBLUE( dwVtx1 ) * (1./255.);
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fVtx1[3] = RGBA_GETALPHA( dwVtx1 ) * (1./255.);
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fVtx2[0] = RGBA_GETRED( dwVtx2 ) * (1./255.);
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fVtx2[1] = RGBA_GETGREEN( dwVtx2 ) * (1./255.);
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fVtx2[2] = RGBA_GETBLUE( dwVtx2 ) * (1./255.);
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fVtx2[3] = RGBA_GETALPHA( dwVtx2 ) * (1./255.);
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Setup( fVtx0, fVtx1, fVtx2);
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}
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///////////////////////////////////////////////////////////////////////////////
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// end
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