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153 lines
7.0 KiB
153 lines
7.0 KiB
///////////////////////////////////////////////////////////////////////////////
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// Copyright (C) Microsoft Corporation, 1998.
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//
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// MapLegcy.cpp
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//
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// Direct3D Reference Rasterizer - Mapping Legacy Modes to Current Functionality
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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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// MapLegacyTextureFilter - Map filter state from renderstate to per-stage state.
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// This is invoked when a texture is bound via the TEXTUREHANDLE renderstate,
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// indicating that we are in 'legacy' texture mode. The rasterizer always
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// refers to per-stage filtering control state, so in legacy mode the filtering
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// controls in the renderstate are mapped into the filtering controls associated
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// with the texture object bound to D3DRS_TEXTUREHANDLE.
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//
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//-----------------------------------------------------------------------------
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void
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RefDev::MapLegacyTextureFilter( void )
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{
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// first check if anisotropic filtering is enabled (indicated by the
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// limit value being set to > 1) - if so then aniso filter will be used
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// for linear mag filter or 'linear within map' min filter
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BOOL bAnisoEnabled = ( m_dwRenderState[D3DRENDERSTATE_ANISOTROPY] > 1 );
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// D3D legacy filter specifications are (XXXMIP)YYY where XXX is the
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// mip filter and YYY is the filter used within an LOD
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// map MAG filter - legacy support is point or linear (and maybe aniso)
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switch ( m_dwRenderState[D3DRENDERSTATE_TEXTUREMAG] )
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{
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default:
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case D3DFILTER_NEAREST:
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m_TextureStageState[0].m_dwVal[D3DTSS_MAGFILTER] = D3DTEXF_POINT;
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break;
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case D3DFILTER_LINEAR:
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// select based on aniso enable
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m_TextureStageState[0].m_dwVal[D3DTSS_MAGFILTER] =
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bAnisoEnabled ? D3DTEXF_ANISOTROPIC : D3DTEXF_LINEAR;
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break;
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}
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// map MIN and MIP filter at the same time - legacy support
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// has them intermingled...
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switch ( m_dwRenderState[D3DRENDERSTATE_TEXTUREMIN] )
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{
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case D3DFILTER_NEAREST:
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m_TextureStageState[0].m_dwVal[D3DTSS_MINFILTER] = D3DTEXF_POINT;
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m_TextureStageState[0].m_dwVal[D3DTSS_MIPFILTER] = D3DTEXF_NONE;
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break;
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case D3DFILTER_MIPNEAREST:
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m_TextureStageState[0].m_dwVal[D3DTSS_MINFILTER] = D3DTEXF_POINT;
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m_TextureStageState[0].m_dwVal[D3DTSS_MIPFILTER] = D3DTEXF_POINT;
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break;
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case D3DFILTER_LINEARMIPNEAREST:
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m_TextureStageState[0].m_dwVal[D3DTSS_MINFILTER] = D3DTEXF_POINT;
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m_TextureStageState[0].m_dwVal[D3DTSS_MIPFILTER] = D3DTEXF_LINEAR;
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break;
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case D3DFILTER_LINEAR:
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// select min filter based on aniso enable
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m_TextureStageState[0].m_dwVal[D3DTSS_MINFILTER] =
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bAnisoEnabled ? D3DTEXF_ANISOTROPIC : D3DTEXF_LINEAR;
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m_TextureStageState[0].m_dwVal[D3DTSS_MIPFILTER] = D3DTEXF_NONE;
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break;
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case D3DFILTER_MIPLINEAR:
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// select min filter based on aniso enable
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m_TextureStageState[0].m_dwVal[D3DTSS_MINFILTER] =
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bAnisoEnabled ? D3DTEXF_ANISOTROPIC : D3DTEXF_LINEAR;
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m_TextureStageState[0].m_dwVal[D3DTSS_MIPFILTER] = D3DTEXF_POINT;
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break;
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case D3DFILTER_LINEARMIPLINEAR:
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// select based on aniso enable
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m_TextureStageState[0].m_dwVal[D3DTSS_MINFILTER] =
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bAnisoEnabled ? D3DTEXF_ANISOTROPIC : D3DTEXF_LINEAR;
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m_TextureStageState[0].m_dwVal[D3DTSS_MIPFILTER] = D3DTEXF_LINEAR;
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break;
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}
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}
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//-----------------------------------------------------------------------------
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//
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// MapLegacyTextureBlend - Maps legacy (pre-DX6) texture blend modes to DX6
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// texture blending controls. Uses per-stage program mode (first stage only).
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// This mapping is done whenever the legacy TBLEND renderstate is set, and
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// does overwrite any previously set DX6 texture blending controls.
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//
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//-----------------------------------------------------------------------------
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void
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RefDev::MapLegacyTextureBlend( void )
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{
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// disable texture blend processing stage 1 (this also disables subsequent stages)
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m_TextureStageState[1].m_dwVal[D3DTSS_COLOROP] = D3DTOP_DISABLE;
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// set texture blend processing stage 0 to match legacy mode
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switch ( m_dwRenderState[D3DRENDERSTATE_TEXTUREMAPBLEND] )
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{
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default:
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case D3DTBLEND_DECALMASK: // unsupported - do decal
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case D3DTBLEND_DECAL:
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case D3DTBLEND_COPY:
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m_TextureStageState[0].m_dwVal[D3DTSS_COLOROP] = D3DTOP_SELECTARG1;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAOP] = D3DTOP_SELECTARG1;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG1] = D3DTA_TEXTURE;
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break;
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case D3DTBLEND_MODULATEMASK: // unsupported - do modulate
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case D3DTBLEND_MODULATE:
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m_TextureStageState[0].m_dwVal[D3DTSS_COLOROP] = D3DTOP_MODULATE;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG2] = D3DTA_DIFFUSE;
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// a special legacy alpha operation is called for that depends
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// on the format of the texture
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAOP] = D3DTOP_LEGACY_ALPHAOVR;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG2] = D3DTA_DIFFUSE;
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break;
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case D3DTBLEND_MODULATEALPHA:
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m_TextureStageState[0].m_dwVal[D3DTSS_COLOROP] = D3DTOP_MODULATE;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG2] = D3DTA_DIFFUSE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAOP] = D3DTOP_MODULATE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG2] = D3DTA_DIFFUSE;
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break;
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case D3DTBLEND_DECALALPHA:
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m_TextureStageState[0].m_dwVal[D3DTSS_COLOROP] = D3DTOP_BLENDTEXTUREALPHA;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG2] = D3DTA_DIFFUSE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAOP] = D3DTOP_SELECTARG2;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG2] = D3DTA_DIFFUSE;
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break;
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case D3DTBLEND_ADD:
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m_TextureStageState[0].m_dwVal[D3DTSS_COLOROP] = D3DTOP_ADD;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_COLORARG2] = D3DTA_DIFFUSE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAOP] = D3DTOP_SELECTARG2;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG1] = D3DTA_TEXTURE;
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m_TextureStageState[0].m_dwVal[D3DTSS_ALPHAARG2] = D3DTA_DIFFUSE;
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break;
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}
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}
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///////////////////////////////////////////////////////////////////////////////
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// end
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