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@ -18,7 +18,11 @@
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#include <Atom/Features/PBR/Lights/LightTypesCommon.azsli>
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#include <Atom/Features/PBR/LightingUtils.azsli>
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void ApplyIblDiffuse(float3 normal, float3 albedo, float3 diffuseResponse, out float3 outDiffuse)
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void ApplyIblDiffuse(
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float3 normal,
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float3 albedo,
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float3 diffuseResponse,
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out float3 outDiffuse)
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{
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float3 irradianceDir = MultiplyVectorQuaternion(normal, SceneSrg::m_iblOrientation);
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float3 diffuseSample = SceneSrg::m_diffuseEnvMap.Sample(SceneSrg::m_samplerEnv, GetCubemapCoords(irradianceDir)).rgb;
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@ -26,10 +30,18 @@ void ApplyIblDiffuse(float3 normal, float3 albedo, float3 diffuseResponse, out f
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outDiffuse = diffuseResponse * albedo * diffuseSample;
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}
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void ApplyIblSpecular(float3 position, float3 normal, float3 specularF0, float roughnessLinear, float3 specularResponse, float3 dirToCamera, float2 brdf, out float3 outSpecular)
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void ApplyIblSpecular(
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float3 position,
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float3 normal,
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float3 specularF0,
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float roughnessLinear,
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float3 dirToCamera,
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float2 brdf,
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out float3 outSpecular)
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{
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float3 reflectDir = reflect(-dirToCamera, normal);
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reflectDir = MultiplyVectorQuaternion(reflectDir, SceneSrg::m_iblOrientation);
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// global
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outSpecular = SceneSrg::m_specularEnvMap.SampleLevel(SceneSrg::m_samplerEnv, GetCubemapCoords(reflectDir), GetRoughnessMip(roughnessLinear)).rgb;
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outSpecular *= (specularF0 * brdf.x + brdf.y);
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@ -70,9 +82,21 @@ void ApplyIBL(Surface surface, inout LightingData lightingData)
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if (o_enableIBL)
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{
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float3 iblDiffuse = 0.0f;
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ApplyIblDiffuse(
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surface.normal,
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surface.albedo,
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lightingData.diffuseResponse,
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iblDiffuse);
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float3 iblSpecular = 0.0f;
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ApplyIblDiffuse(surface.normal, surface.albedo, lightingData.diffuseResponse, iblDiffuse);
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ApplyIblSpecular(surface.position, surface.normal, surface.specularF0, surface.roughnessLinear, lightingData.specularResponse, lightingData.dirToCamera, lightingData.brdf, iblSpecular);
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ApplyIblSpecular(
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surface.position,
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surface.normal,
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surface.specularF0,
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surface.roughnessLinear,
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lightingData.dirToCamera,
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lightingData.brdf,
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iblSpecular);
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// Adjust IBL lighting by exposure.
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float iblExposureFactor = pow(2.0, SceneSrg::m_iblExposure);
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@ -85,7 +109,47 @@ void ApplyIBL(Surface surface, inout LightingData lightingData)
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if (o_enableIBL)
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{
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float3 iblSpecular = 0.0f;
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ApplyIblSpecular(surface.position, surface.normal, surface.specularF0, surface.roughnessLinear, lightingData.specularResponse, lightingData.dirToCamera, lightingData.brdf, iblSpecular);
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ApplyIblSpecular(
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surface.position,
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surface.normal,
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surface.specularF0,
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surface.roughnessLinear,
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lightingData.dirToCamera,
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lightingData.brdf,
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iblSpecular);
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iblSpecular *= lightingData.multiScatterCompensation;
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if (o_clearCoat_feature_enabled)
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{
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if (surface.clearCoat.factor > 0.0f)
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{
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float clearCoatNdotV = saturate(dot(surface.clearCoat.normal, lightingData.dirToCamera));
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clearCoatNdotV = max(clearCoatNdotV, 0.01f); // [GFX TODO][ATOM-4466] This is a current band-aid for specular noise at grazing angles.
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float2 clearCoatBrdf = PassSrg::m_brdfMap.Sample(PassSrg::LinearSampler, GetBRDFTexCoords(surface.clearCoat.roughness, clearCoatNdotV)).rg;
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// clear coat uses fixed IOR = 1.5 represents polyurethane which is the most common material for gloss clear coat
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// coat layer assumed to be dielectric thus don't need multiple scattering compensation
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float3 clearCoatSpecularF0 = float3(0.04f, 0.04f, 0.04f);
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float3 clearCoatIblSpecular = 0.0f;
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ApplyIblSpecular(
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surface.position,
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surface.clearCoat.normal,
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clearCoatSpecularF0,
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surface.clearCoat.roughness,
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lightingData.dirToCamera,
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clearCoatBrdf,
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clearCoatIblSpecular);
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clearCoatIblSpecular *= surface.clearCoat.factor;
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// attenuate base layer energy
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float3 clearCoatResponse = FresnelSchlickWithRoughness(clearCoatNdotV, clearCoatSpecularF0, surface.clearCoat.roughness) * surface.clearCoat.factor;
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iblSpecular = iblSpecular * (1.0 - clearCoatResponse) * (1.0 - clearCoatResponse) + clearCoatIblSpecular;
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}
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}
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float iblExposureFactor = pow(2.0f, SceneSrg::m_iblExposure);
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lightingData.specularLighting += (iblSpecular * iblExposureFactor);
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dmcdiar
5 years ago