76 lines
2.2 KiB
PostScript
76 lines
2.2 KiB
PostScript
/**
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* @ Version: SCREEN SPACE SHADERS - UPDATE 20
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* @ Description: Non-directional volumetric shader
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* @ Modified time: 2024-02-20 07:26
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* @ Author: https://www.moddb.com/members/ascii1457
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* @ Mod: https://www.moddb.com/mods/stalker-anomaly/addons/screen-space-shaders
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*/
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// Remember: If you need new textures or samplers, remember to edit both `accum_volumetric.s` and `accum_volumetric_nomsaa.s`
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#include "common.h"
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#include "shadow.h"
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#ifndef ISAMPLE
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#define ISAMPLE 0
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#endif
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struct v2p
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{
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float3 lightToPos : TEXCOORD0; // light center to plane vector
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float3 vPos : TEXCOORD1; // position in camera space
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float fDensity : TEXCOORD2; // plane density along Z axis
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};
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float4 m_lmap[2];
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//uniform float4 shader_param_6;
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//////////////////////////////////////////////////////////////////////////////////////////
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// Pixel
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#ifndef MSAA_OPTIMIZATION
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float4 main ( v2p I ) : SV_Target
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#else
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float4 main ( v2p I, uint iSample : SV_SAMPLEINDEX ) : SV_Target
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#endif
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{
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// Screen UV ( view to uv ) // TODO : Use the Matrix mul from the vertex shader
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float4 Postc = mul(m_P, float4(I.vPos, 1));
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float2 tc = (Postc.xy / Postc.w) * float2(0.5f, -0.5f) + 0.5f;
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// Shadow matrix
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float4 P4 = float4(I.vPos, 1);
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float4 PS = mul( m_shadow, P4);
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PS.xyz /= PS.w;
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// Occlusion from light perspective.
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float occ = s_smap.SampleCmpLevelZero( smp_smap, PS.xy, PS.z).x;
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// Occlusion from player perspective.
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float _depth = 0;
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#ifndef USE_MSAA
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_depth = s_position.Sample(smp_nofilter, tc).z;
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#else
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_depth = s_position.Load(int3(tc * screen_res.xy, 0), iSample).z;
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#endif
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_depth = _depth <= SKY_EPS ? 10000 : _depth; // Sky
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occ *= _depth < Postc.z ? 0.0f : 1.0f;
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// Texture mask
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PS.x = dot( P4, m_lmap[0]);
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PS.y = dot( P4, m_lmap[1]);
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PS.xy /= PS.w;
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float4 lightmap = s_lmap.Sample(smp_jitter, PS.xy);
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// Attenuate ( Vanilla light attenuation )
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float rsqr = dot( I.lightToPos, I.lightToPos); // distance 2 light (squared)
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float att = saturate( 1.0f - rsqr * Ldynamic_pos.w ); // q-linear attenuate
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// Add extra attenuation when passing through.
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att *= saturate(Postc.z * 2.5f);
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// Result
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float3 result = I.fDensity * occ * att * lightmap * Ldynamic_color;
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return float4( result, 0);
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} |