mirror of
https://github.com/id-Software/DOOM-3-BFG.git
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110 lines
4.4 KiB
HLSL
110 lines
4.4 KiB
HLSL
/*
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===========================================================================
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Doom 3 BFG Edition GPL Source Code
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Copyright (C) 1993-2012 id Software LLC, a ZeniMax Media company.
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Copyright (C) 2013-2020 Robert Beckebans
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This file is part of the Doom 3 BFG Edition GPL Source Code ("Doom 3 BFG Edition Source Code").
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Doom 3 BFG Edition Source Code is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Doom 3 BFG Edition Source Code is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Doom 3 BFG Edition Source Code. If not, see <http://www.gnu.org/licenses/>.
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In addition, the Doom 3 BFG Edition Source Code is also subject to certain additional terms. You should have received a copy of these additional terms immediately following the terms and conditions of the GNU General Public License which accompanied the Doom 3 BFG Edition Source Code. If not, please request a copy in writing from id Software at the address below.
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If you have questions concerning this license or the applicable additional terms, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
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===========================================================================
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*/
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#include "global_inc.hlsl"
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// *INDENT-OFF*
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Texture2D t_Normal : register( t0 VK_DESCRIPTOR_SET( 1 ) );
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Texture2D t_Specular : register( t1 VK_DESCRIPTOR_SET( 1 ) );
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Texture2D t_BaseColor : register( t2 VK_DESCRIPTOR_SET( 1 ) );
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Texture2D t_LightFalloff : register( t3 VK_DESCRIPTOR_SET( 2 ) );
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Texture2D t_LightProjection : register( t4 VK_DESCRIPTOR_SET( 2 ) );
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SamplerState s_Material : register( s0 VK_DESCRIPTOR_SET( 3 ) ); // for the normal/specular/basecolor
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SamplerState s_Lighting : register( s1 VK_DESCRIPTOR_SET( 3 ) ); // for sampling the jitter
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struct PS_IN
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{
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float4 position : SV_Position;
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// float4 texcoord0 : TEXCOORD0_centroid;
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float4 texcoord1 : TEXCOORD1_centroid;
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float4 texcoord2 : TEXCOORD2_centroid;
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float4 texcoord3 : TEXCOORD3_centroid;
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float4 texcoord4 : TEXCOORD4_centroid;
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float4 texcoord5 : TEXCOORD5_centroid;
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float4 texcoord6 : TEXCOORD6_centroid;
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float4 color : COLOR0;
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};
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struct PS_OUT
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{
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half4 color : SV_Target0;
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};
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// *INDENT-ON*
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void main( PS_IN fragment, out PS_OUT result )
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{
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float4 bumpMap = t_Normal.Sample( s_Material, fragment.texcoord1.xy );
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float4 lightFalloff = idtex2Dproj( s_Lighting, t_LightFalloff, fragment.texcoord2 );
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float4 lightProj = idtex2Dproj( s_Lighting, t_LightProjection, fragment.texcoord3 );
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float4 YCoCG = t_BaseColor.Sample( s_Material, fragment.texcoord4.xy );
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float4 specMapSRGB = t_Specular.Sample( s_Material, fragment.texcoord5.xy );
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float4 specMap = sRGBAToLinearRGBA( specMapSRGB );
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const float3 ambientLightVector = half3( 0.5f, 9.5f - 0.385f, 0.8925f );
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float3 lightVector = normalize( ambientLightVector );
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float3 diffuseMap = sRGBToLinearRGB( ConvertYCoCgToRGB( YCoCG ) );
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float3 localNormal;
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// RB begin
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#if defined(USE_NORMAL_FMT_RGB8)
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localNormal.xy = bumpMap.rg - 0.5;
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#else
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localNormal.xy = bumpMap.wy - 0.5;
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#endif
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// RB end
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localNormal.z = sqrt( abs( dot( localNormal.xy, localNormal.xy ) - 0.25 ) );
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localNormal = normalize( localNormal );
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// traditional very dark Lambert light model used in Doom 3
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float ldotN = saturate( dot3( localNormal, lightVector ) );
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#if defined(USE_HALF_LAMBERT)
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// RB: http://developer.valvesoftware.com/wiki/Half_Lambert
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float halfLdotN = dot3( localNormal, lightVector ) * 0.5 + 0.5;
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halfLdotN *= halfLdotN;
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float lambert = halfLdotN;
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#else
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float lambert = ldotN;
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#endif
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const float specularPower = 10.0f;
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float hDotN = dot3( normalize( fragment.texcoord6.xyz ), localNormal );
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// RB: added abs
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float3 specularContribution = _float3( pow( abs( hDotN ), specularPower ) );
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float3 diffuseColor = diffuseMap * ( rpDiffuseModifier.xyz );
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float3 specularColor = specMap.xyz * specularContribution * ( rpSpecularModifier.xyz );
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float3 lightColor = sRGBToLinearRGB( lightProj.xyz * lightFalloff.xyz );
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result.color.xyz = ( diffuseColor + specularColor ) * lightColor * fragment.color.xyz;
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result.color.w = 1.0;
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}
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