71 lines
1.7 KiB
HLSL
71 lines
1.7 KiB
HLSL
// Copyright (c) Wojciech Figat. All rights reserved.
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#ifndef __GBUFFER_COMMON__
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#define __GBUFFER_COMMON__
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#include "./Flax/Common.hlsl"
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// GBuffer sample data structure
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struct GBufferSample
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{
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float3 Normal;
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float Roughness;
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float3 WorldPos;
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float Metalness;
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float3 Color;
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float Specular;
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float3 ViewPos;
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float AO;
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int ShadingModel;
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#if defined(USE_GBUFFER_CUSTOM_DATA)
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float4 CustomData;
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#endif
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};
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bool IsSubsurfaceMode(int shadingModel)
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{
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return shadingModel == SHADING_MODEL_SUBSURFACE || shadingModel == SHADING_MODEL_FOLIAGE;
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}
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float3 GetDiffuseColor(float3 color, float metalness)
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{
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return color * (1.0 - metalness);
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}
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// [https://google.github.io/filament/Filament.md.html]
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float3 GetSpecularColor(float3 color, float specular, float metalness)
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{
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float dielectricF0 = 0.16 * specular * specular;
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return lerp(dielectricF0.xxx, color, metalness.xxx);
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}
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// Calculate material diffuse color
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float3 GetDiffuseColor(GBufferSample gBuffer)
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{
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return GetDiffuseColor(gBuffer.Color, gBuffer.Metalness);
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}
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// Calculate material specular color
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float3 GetSpecularColor(GBufferSample gBuffer)
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{
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return GetSpecularColor(gBuffer.Color, gBuffer.Specular, gBuffer.Metalness);
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}
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// Compact Normal Storage for Small G-Buffers
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// [Aras Pranckevièius 2010, http://aras-p.info/texts/CompactNormalStorage.html]
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float3 EncodeNormal(float3 n)
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{
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// Pack to [0;1] range
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return n * 0.5 + 0.5;
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}
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// Compact Normal Storage for Small G-Buffers
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// [Aras Pranckevièius 2010, http://aras-p.info/texts/CompactNormalStorage.html]
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float3 DecodeNormal(float3 enc)
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{
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// Unpack from [0;1] range
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return normalize(enc * 2 - 1);
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}
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#endif
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