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improve screenspace direct SSS for stuff in the opposite direction of the sun

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Xonk
2026-04-04 21:31:46 -04:00
parent 86292ccbc5
commit 2aad8602d5
1 changed files with 17 additions and 21 deletions
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shaders/dimensions/composite1.fsh
+17 -21
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@@ -334,7 +334,7 @@ float swapperlinZ(float depth, float _near, float _far) {
}
vec2 SSRT_Shadows(vec3 viewPos, bool depthCheck, vec3 lightDir, float noise, bool isSSS, bool hand){
vec2 SSRT_Shadows(vec3 viewPos, bool depthCheck, vec3 lightDir, float noise, bool isSSS, bool hand, in float NdotL){
// return 1.0;
@@ -355,7 +355,7 @@ vec2 SSRT_Shadows(vec3 viewPos, bool depthCheck, vec3 lightDir, float noise, boo
float rayLength = ((viewPos.z + lightDir.z * _far * sqrt(3.)) > -_near) ? (-_near - viewPos.z) / lightDir.z : _far * sqrt(3.);
vec3 direction = toClipSpace3_DH(viewPos + lightDir*rayLength, depthCheck) - position;
direction.xyz = direction.xyz / max(max(abs(direction.x)/0.0005, abs(direction.y)/0.0005),400.0); //fixed step size
direction.xyz = direction.xyz / max(max(abs(direction.x)/0.0005, abs(direction.y)/0.0005),400.0); //fixed step size
direction *= 6.0;
position.xy *= RENDER_SCALE;
@@ -365,10 +365,10 @@ vec2 SSRT_Shadows(vec3 viewPos, bool depthCheck, vec3 lightDir, float noise, boo
// literally shadow bias to fight shadow acne due to precision problems when comparing sampled depth and marched position
newPos += direction*0.3;
float SSSdistanceScale = 1.0 / (1.0 + swapperlinZ(position.z, _near, _far)*32.0);
float distanceScale2 = 1.0 + length(mat3(gbufferModelViewInverse) * viewPos) / 150.0;
float distanceScale2 = 1.0 + length(viewPos) / 100.0;
float SSSdistanceScale = 1.0 / distanceScale2;
for (int i = 0; i < int(samples); i++) {
for (int i = 0; i < int(samples); i++) {
if(newPos.x < 0 || newPos.x > 1 || newPos.y < 0 || newPos.y > 1) break;
#ifdef USING_LOD_MOD
@@ -382,23 +382,19 @@ vec2 SSRT_Shadows(vec3 viewPos, bool depthCheck, vec3 lightDir, float noise, boo
float sampleDepth = convertHandDepth_2(texelFetch(depthtex1, ivec2(newPos.xy/texelSize),0).x,hand);
#endif
if(sampleDepth < newPos.z){
float linearCurrentPos = swapperlinZ(newPos.z, _near, _far);
float linearSampledDepth = swapperlinZ(sampleDepth, _near, _far);
float dist = abs(linearSampledDepth - linearCurrentPos) / linearCurrentPos;
// if (dist < 0.035){
if (dist < 0.035/(1.0+linearCurrentPos)) shadows = 0.0;
// if (dist < 0.3/(1.0+linearCurrentPos)) SSS += distanceScale2;
if (dist < SSSdistanceScale) SSS += distanceScale2;
}
newPos += direction;
float linearCurrentPos = swapperlinZ(newPos.z, _near, _far);
float linearSampledDepth = swapperlinZ(sampleDepth, _near, _far);
float dist = abs(linearSampledDepth - linearCurrentPos) / linearCurrentPos;
if(sampleDepth < newPos.z){
if (dist < 0.035/(1.0+linearCurrentPos)) shadows = 0.0;
if (dist < SSSdistanceScale) SSS += distanceScale2;
}else{
if (dist < SSSdistanceScale*0.05) SSS += distanceScale2 * NdotL;
}
newPos += direction;
}
return vec2(shadows, SSS / samples );
return vec2(shadows, SSS / samples);
}
#if HANDHELD_LIGHTSOURCE_SSRT_SHADOWS > 0
float handHeldLight_SSRT_Shadows(vec3 viewPos, vec3 shadowHandPos, float noise){
@@ -1156,7 +1152,7 @@ void main() {
#endif
#ifdef SCREENSPACE_CONTACT_SHADOWS
vec2 SS_directLight = SSRT_Shadows(toScreenSpace_DH(texcoord/RENDER_SCALE, z, DH_depth1), isDHrange, normalize(WsunVec*mat3(gbufferModelViewInverse)), ig_noise, sunSSS_density > 0.0 && shadowMapFalloff2 < 1.0, hand);
vec2 SS_directLight = SSRT_Shadows(toScreenSpace_DH(texcoord/RENDER_SCALE, z, DH_depth1), isDHrange, normalize(WsunVec*mat3(gbufferModelViewInverse)), ig_noise, sunSSS_density > 0.0 && shadowMapFalloff2 < 1.0, hand, clamp(-dot(feetPlayerPos_normalized, WsunVec),0,1) * (NdotL));
// combine shadowmap with screenspace shadows.
if(!opaqueParticles) shadowColor *= SS_directLight.r;
#else