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Add direct lighting rendering into Global Surface Atlas

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This commit is contained in:
Wojciech Figat
2022-04-13 16:26:19 +02:00
parent 0a27d277a0
commit 0668a23167
10 changed files with 322 additions and 97 deletions
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29
Source/Shaders/Lighting.hlsl
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@@ -3,10 +3,6 @@
#ifndef __LIGHTING__
#define __LIGHTING__
#if !defined(USE_GBUFFER_CUSTOM_DATA)
#error "Cannot calculate lighting without custom data in GBuffer. Define USE_GBUFFER_CUSTOM_DATA."
#endif
#include "./Flax/LightingCommon.hlsl"
ShadowData GetShadow(LightData lightData, GBufferSample gBuffer, float4 shadowMask)
@@ -20,21 +16,23 @@ ShadowData GetShadow(LightData lightData, GBufferSample gBuffer, float4 shadowMa
LightingData StandardShading(GBufferSample gBuffer, float energy, float3 L, float3 V, half3 N)
{
float3 diffuseColor = GetDiffuseColor(gBuffer);
float3 specularColor = GetSpecularColor(gBuffer);
float3 H = normalize(V + L);
float NoL = saturate(dot(N, L));
float NoV = max(dot(N, V), 1e-5);
float NoH = saturate(dot(N, H));
float VoH = saturate(dot(V, H));
float D = D_GGX(gBuffer.Roughness, NoH) * energy;
float Vis = Vis_SmithJointApprox(gBuffer.Roughness, NoV, NoL);
float3 F = F_Schlick(specularColor, VoH);
LightingData lighting;
lighting.Diffuse = Diffuse_Lambert(diffuseColor);
#if defined(NO_SPECULAR)
lighting.Specular = 0;
#else
float3 specularColor = GetSpecularColor(gBuffer);
float3 F = F_Schlick(specularColor, VoH);
float D = D_GGX(gBuffer.Roughness, NoH) * energy;
float Vis = Vis_SmithJointApprox(gBuffer.Roughness, NoV, NoL);
lighting.Specular = (D * Vis) * F;
#endif
lighting.Transmission = 0;
return lighting;
}
@@ -42,7 +40,7 @@ LightingData StandardShading(GBufferSample gBuffer, float energy, float3 L, floa
LightingData SubsurfaceShading(GBufferSample gBuffer, float energy, float3 L, float3 V, half3 N)
{
LightingData lighting = StandardShading(gBuffer, energy, L, V, N);
#if defined(USE_GBUFFER_CUSTOM_DATA)
// Fake effect of the light going through the material
float3 subsurfaceColor = gBuffer.CustomData.rgb;
float opacity = gBuffer.CustomData.a;
@@ -51,21 +49,21 @@ LightingData SubsurfaceShading(GBufferSample gBuffer, float energy, float3 L, fl
float normalContribution = saturate(dot(N, H) * opacity + 1.0f - opacity);
float backScatter = gBuffer.AO * normalContribution / (PI * 2.0f);
lighting.Transmission = lerp(backScatter, 1, inscatter) * subsurfaceColor;
#endif
return lighting;
}
LightingData FoliageShading(GBufferSample gBuffer, float energy, float3 L, float3 V, half3 N)
{
LightingData lighting = StandardShading(gBuffer, energy, L, V, N);
#if defined(USE_GBUFFER_CUSTOM_DATA)
// Fake effect of the light going through the thin foliage
float3 subsurfaceColor = gBuffer.CustomData.rgb;
float wrapNoL = saturate((-dot(N, L) + 0.5f) / 2.25);
float VoL = dot(V, L);
float scatter = D_GGX(0.36, saturate(-VoL));
lighting.Transmission = subsurfaceColor * (wrapNoL * scatter);
#endif
return lighting;
}
@@ -144,9 +142,6 @@ float4 GetLighting(float3 viewPos, LightData lightData, GBufferSample gBuffer, f
// Calculate direct lighting
LightingData lighting = SurfaceShading(gBuffer, energy, L, V, N);
#if NO_SPECULAR
lighting.Specular = float3(0, 0, 0);
#endif
// Calculate final light color
float3 surfaceLight = (lighting.Diffuse + lighting.Specular) * (NoL * attenuation * shadow.SurfaceShadow);