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82 lines
2.6 KiB
82 lines
2.6 KiB
5 years ago
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// DYNAMIC: "DOWATERFOG" "0..1"
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// DYNAMIC: "SKINNING" "0..1"
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#include "common_vs_fxc.h"
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static const bool g_bSkinning = SKINNING ? true : false;
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static const int g_FogType = DOWATERFOG;
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const float4 cShadowTextureMatrix[3] : register( SHADER_SPECIFIC_CONST_0 );
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const float4 cTexOrigin : register( SHADER_SPECIFIC_CONST_3 );
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const float4 cTexScale : register( SHADER_SPECIFIC_CONST_4 );
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// { Shadow falloff offset, 1/Shadow distance, Shadow scale, 0 }
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const float3 cShadowConstants : register( SHADER_SPECIFIC_CONST_5 );
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#define flShadowFalloffOffset cShadowConstants.x
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#define flOneOverShadowDist cShadowConstants.y
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#define flShadowScale cShadowConstants.z
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struct VS_INPUT
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{
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float4 vPos : POSITION;
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float3 vNormal : NORMAL;
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float4 vBoneWeights : BLENDWEIGHT;
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float4 vBoneIndices : BLENDINDICES;
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};
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struct VS_OUTPUT
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{
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float4 projPos : POSITION; // Projection-space position
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float3 T0 : TEXCOORD0; // PS wants this to be 4D but VS doesn't? (see original asm sources)
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float3 T1 : TEXCOORD1;
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float3 T2 : TEXCOORD2;
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float T3 : TEXCOORD3;
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float4 vColor : COLOR0;
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float fog : FOG;
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};
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VS_OUTPUT main( const VS_INPUT v )
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{
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VS_OUTPUT o;
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// Perform skinning
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float3 worldNormal, worldPos;
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SkinPositionAndNormal( g_bSkinning, v.vPos, v.vNormal, v.vBoneWeights, v.vBoneIndices, worldPos, worldNormal );
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// Transform into projection space
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o.projPos = mul( float4( worldPos, 1 ), cViewProj );
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// Compute fog
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o.fog = CalcFog( worldPos, o.projPos, g_FogType );
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// Transform position into texture space (from 0 to 1)
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float3 vTexturePos;
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vTexturePos.x = dot( worldPos.xyz, cShadowTextureMatrix[0].xyz );
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vTexturePos.y = dot( worldPos.xyz, cShadowTextureMatrix[1].xyz );
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vTexturePos.z = dot( worldPos.xyz, cShadowTextureMatrix[2].xyz );
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// Figure out the shadow fade amount
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float flShadowFade = ( vTexturePos.z - flShadowFalloffOffset ) * flOneOverShadowDist;
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// Offset it into the texture
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o.T0 = vTexturePos * cTexScale + cTexOrigin;
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// We're doing clipping by using texkill
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o.T1.xyz = vTexturePos.xyz; // Also clips when shadow z < 0 !
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o.T2.xyz = float3( 1.0f, 1.0f, 1.0f ) - vTexturePos.xyz;
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o.T2.z = 1.0f - flShadowFade; // Clips when shadow z > shadow distance
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// We're doing backface culling by using texkill also (wow yucky)
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// --------------------------------------------------------------
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// Transform z component of normal in texture space
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// If it's negative, then don't draw the pixel
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o.T3 = dot( worldNormal, -cShadowTextureMatrix[2] );
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// Shadow color, falloff
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o.vColor.xyz = cModulationColor.xyz;
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o.vColor.w = flShadowFade * flShadowScale;
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return o;
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}
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