chore: GI tweaks

features/Subsurface Scattering/Shaders/SubsurfaceScattering/SeparableSSS.hlsli

@@ -102,7 +102,7 @@ float4 SSSSBlurCS(
 	float4 colorM = ColorTexture[DTid.xy];
 
 #if defined(HORIZONTAL)
-	colorM.rgb = Color::GammaToLinear(colorM.rgb);
+	colorM.rgb = Color::GammaToTrueLinear(colorM.rgb);
 #endif
 
 	if (sssAmount == 0)

features/Subsurface Scattering/Shaders/SubsurfaceScattering/SeparableSSSCS.hlsl

@@ -38,7 +38,7 @@ cbuffer PerFrameSSS : register(b1)
 	bool humanProfile = MaskTexture[DTid.xy].y == sssAmount;
 
 	float4 color = SSSSBlurCS(DTid.xy, texCoord, float2(0.0, 1.0), sssAmount, humanProfile);
-	color.rgb = Color::LinearToGamma(color.rgb);
+	color.rgb = Color::TrueLinearToGamma(color.rgb);
 	SSSRW[DTid.xy] = float4(color.rgb, 1.0);
 
 #endif

package/Shaders/Common/Color.hlsli

@@ -46,12 +46,22 @@ namespace Color
 
 	float3 GammaToLinear(float3 color)
 	{
-		return pow(color, 1.6);
+		return pow(color, 1.8);
 	}
 
 	float3 LinearToGamma(float3 color)
 	{
-		return pow(color, 1.0 / 1.6);
+		return pow(color, 1.0 / 1.8);
+	}
+
+	float3 GammaToTrueLinear(float3 color)
+	{
+		return pow(color, 2.2);
+	}
+
+	float3 TrueLinearToGamma(float3 color)
+	{
+		return pow(color, 1.0 / 2.2);
 	}
 
 	float3 Diffuse(float3 color)

src/Features/ScreenSpaceGI.cpp

@@ -171,14 +171,14 @@ void ScreenSpaceGI::DrawSettings()
 
 	ImGui::Separator();
 
-	ImGui::SliderFloat("AO radius", &settings.AORadius, 10.f, 800.0f, "%.1f game units");
+	ImGui::SliderFloat("AO radius", &settings.AORadius, 10.f, 1024.0f, "%.1f game units");
 	if (auto _tt = Util::HoverTooltipWrapper())
 		ImGui::Text("A smaller radius produces tighter AO.");
 
 	{
 		auto _ = Util::DisableGuard(!settings.EnableGI);
 
-		ImGui::SliderFloat("IL radius", &settings.GIRadius, 10.f, 800.0f, "%.1f game units");
+		ImGui::SliderFloat("IL radius", &settings.GIRadius, 10.f, 1024.0f, "%.1f game units");
 		if (auto _tt = Util::HoverTooltipWrapper())
 			ImGui::Text("A larger radius produces wider IL.");
 	}
@@ -194,7 +194,7 @@ void ScreenSpaceGI::DrawSettings()
 	if (showAdvanced) {
 		ImGui::Separator();
 
-		ImGui::SliderFloat("Thickness", &settings.Thickness, 0.f, 500.0f, "%.1f game units");
+		ImGui::SliderFloat("Thickness", &settings.Thickness, 0.f, 128.0f, "%.1f game units");
 		if (auto _tt = Util::HoverTooltipWrapper())
 			ImGui::Text("How thick the occluders are. Only affects AO.");
 	}

src/Features/ScreenSpaceGI.h

@@ -51,25 +51,25 @@ struct ScreenSpaceGI : Feature
 		int ResolutionMode = 1;  // 0-full, 1-half, 2-quarter
 		// visual
 		float MinScreenRadius = 0.01f;
-		float AORadius = 256.f;
-		float GIRadius = 256.f;
-		float Thickness = 16.f;
+		float AORadius = 512.f;
+		float GIRadius = 512.f;
+		float Thickness = 32.f;
 		float2 DepthFadeRange = { 4e4, 5e4 };
 		// gi
-		float GISaturation = 0.9f;
+		float GISaturation = 1.0f;
 		bool EnableGIBounce = true;
 		float GIBounceFade = 1.0f;
 		float GIDistanceCompensation = 0.f;
 		// mix
-		float AOPower = 1.0f;
-		float GIStrength = 1.5f;
+		float AOPower = 2.0f;
+		float GIStrength = 2.0f;
 		// denoise
 		bool EnableTemporalDenoiser = true;
 		bool EnableBlur = true;
 		float DepthDisocclusion = .1f;
 		float NormalDisocclusion = .1f;
-		uint MaxAccumFrames = 16;
-		float BlurRadius = 2.f;
+		uint MaxAccumFrames = 30;
+		float BlurRadius = 5.f;
 		float DistanceNormalisation = 2.f;
 	} settings;
 

src/Features/Skylighting.h

@@ -36,7 +36,7 @@ struct Skylighting : Feature
 		float MaxZenith = 3.1415926f / 2.f;  // 90 deg
 		float MinDiffuseVisibility = 0.1f;
 		float MinSpecularVisibility = 0.1f;
-		float SSGIAmbientDimmer = 1.0f;
+		float SSGIAmbientDimmer = 0.5f;
 	} settings;
 
 	struct SkylightingCB