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231 行
11 KiB
231 行
11 KiB
#ifndef UNITY_MATERIAL_INCLUDED
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#define UNITY_MATERIAL_INCLUDED
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#include "CoreRP/ShaderLibrary/Color.hlsl"
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#include "CoreRP/ShaderLibrary/Packing.hlsl"
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#include "CoreRP/ShaderLibrary/BSDF.hlsl"
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#include "CoreRP/ShaderLibrary/Debug.hlsl"
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#include "CoreRP/ShaderLibrary/GeometricTools.hlsl"
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#include "CoreRP/ShaderLibrary/CommonMaterial.hlsl"
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#include "CoreRP/ShaderLibrary/EntityLighting.hlsl"
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#include "CoreRP/ShaderLibrary/ImageBasedLighting.hlsl"
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#include "../Sky/AtmosphericScattering/AtmosphericScattering.hlsl"
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// Guidelines for Material Keyword.
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// There is a set of Material Keyword that a HD shaders must define (or not define). We call them system KeyWord.
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// .Shader need to define:
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// - _SURFACE_TYPE_TRANSPARENT if they use a transparent material
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// - _BLENDMODE_ALPHA, _BLENDMODE_ADD, _BLENDMODE_PRE_MULTIPLY for blend mode
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// - _BLENDMODE_PRESERVE_SPECULAR_LIGHTING for correct lighting when blend mode are use with a Lit material
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// - _ENABLE_FOG_ON_TRANSPARENT if fog is enable on transparent surface
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//-----------------------------------------------------------------------------
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// ApplyBlendMode function
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//-----------------------------------------------------------------------------
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float4 ApplyBlendMode(float3 diffuseLighting, float3 specularLighting, float opacity)
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{
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// ref: http://advances.realtimerendering.com/other/2016/naughty_dog/NaughtyDog_TechArt_Final.pdf
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// Lit transparent object should have reflection and tramission.
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// Transmission when not using "rough refraction mode" (with fetch in preblured background) is handled with blend mode.
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// However reflection should not be affected by blend mode. For example a glass should still display reflection and not lose the highlight when blend
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// This is the purpose of following function, "Cancel" the blend mode effect on the specular lighting but not on the diffuse lighting
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#ifdef _BLENDMODE_PRESERVE_SPECULAR_LIGHTING
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// In the case of _BLENDMODE_ALPHA the code should be float4(diffuseLighting + (specularLighting / max(opacity, 0.01)), opacity)
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// However this have precision issue when reaching 0, so we change the blend mode and apply src * src_a inside the shader instead
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#if defined(_BLENDMODE_ADD) || defined(_BLENDMODE_ALPHA)
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return float4(diffuseLighting * opacity + specularLighting, opacity);
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#else // defined(_BLENDMODE_PRE_MULTIPLY)
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return float4(diffuseLighting + specularLighting, opacity);
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#endif
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#else
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#if defined(_BLENDMODE_ADD) || defined(_BLENDMODE_ALPHA)
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return float4((diffuseLighting + specularLighting) * opacity, opacity);
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#else // defined(_BLENDMODE_PRE_MULTIPLY)
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return float4(diffuseLighting + specularLighting, opacity);
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#endif
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#endif
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}
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float4 ApplyBlendMode(float3 color, float opacity)
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{
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return ApplyBlendMode(color, float3(0.0, 0.0, 0.0), opacity);
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}
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//-----------------------------------------------------------------------------
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// Fog sampling function for materials
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//-----------------------------------------------------------------------------
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// Used for transparent object. input color is color + alpha of the original transparent pixel.
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// This must be call after ApplyBlendMode to work correctly
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float4 EvaluateAtmosphericScattering(PositionInputs posInput, float4 inputColor)
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{
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float4 result = inputColor;
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#ifdef _ENABLE_FOG_ON_TRANSPARENT
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float4 fog = EvaluateAtmosphericScattering(posInput);
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#if defined(_BLENDMODE_ALPHA)
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// Regular alpha blend need to multiply fog color by opacity (as we do src * src_a inside the shader)
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result.rgb = lerp(result.rgb, fog.rgb * result.a, fog.a);
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#elif defined(_BLENDMODE_ADD)
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// For additive, we just need to fade to black with fog density (black + background == background color == fog color)
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result.rgb = result.rgb * (1.0 - fog.a);
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#elif defined(_BLENDMODE_PRE_MULTIPLY)
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// For Pre-Multiplied Alpha Blend, we need to multiply fog color by src alpha to match regular alpha blending formula.
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result.rgb = lerp(result.rgb, fog.rgb * result.a, fog.a);
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#endif
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#else
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// Evaluation of fog for opaque objects is currently done in a full screen pass independent from any material parameters.
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// but this funtction is called in generic forward shader code so we need it to be neutral in this case.
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#endif
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return result;
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}
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//-----------------------------------------------------------------------------
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// Alpha test replacement
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//-----------------------------------------------------------------------------
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// This function must be use instead of clip instruction. It allow to manage in which case the clip is perform for optimization purpose
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void DoAlphaTest(float alpha, float alphaCutoff)
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{
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// For Deferred:
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// If we have a prepass, we may want to remove the clip from the GBuffer pass (otherwise HiZ does not work on PS4) - SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST
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// For Forward Opaque:
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// If we have a prepass, we may want to remove the clip from the forward pass (otherwise HiZ does not work on PS4) - SHADERPASS_FORWARD_BYPASS_ALPHA_TEST
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// For Forward Transparent
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// Also no alpha test for light transport
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// Note: If SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST or SHADERPASS_FORWARD_BYPASS_ALPHA_TEST are used, it mean that we must use ZTest depth equal for the pass (Need to use _ZTestDepthEqualForOpaque property).
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#if !defined(SHADERPASS_FORWARD_BYPASS_ALPHA_TEST) && !defined(SHADERPASS_GBUFFER_BYPASS_ALPHA_TEST) && !(SHADERPASS == SHADERPASS_LIGHT_TRANSPORT)
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clip(alpha - alphaCutoff);
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#endif
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}
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//-----------------------------------------------------------------------------
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// Reflection / Refraction hierarchy handling
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//-----------------------------------------------------------------------------
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// This function is use with reflection and refraction hierarchy of LightLoop
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// It will add weight to hierarchyWeight but ensure that hierarchyWeight is not more than one
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// by updating the weight value. Returned weight value must be apply on current lighting
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// Example: Total hierarchyWeight is 0.8 and weight is 0.4. Function return hierarchyWeight of 1.0 and weight of 0.2
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// hierarchyWeight and weight must be positive and between 0 and 1
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void UpdateLightingHierarchyWeights(inout float hierarchyWeight, inout float weight)
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{
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float accumulatedWeight = hierarchyWeight + weight;
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hierarchyWeight = saturate(accumulatedWeight);
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weight -= saturate(accumulatedWeight - hierarchyWeight);
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}
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//-----------------------------------------------------------------------------
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// BuiltinData
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//-----------------------------------------------------------------------------
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#include "Builtin/BuiltinData.hlsl"
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//-----------------------------------------------------------------------------
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// Material definition
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//-----------------------------------------------------------------------------
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// Here we include all the different lighting model supported by the renderloop based on define done in .shader
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// Only one deferred layout is allowed for a HDRenderPipeline, this will be detect by the redefinition of GBUFFERMATERIAL_COUNT
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// If GBUFFERMATERIAL_COUNT is define two time, the shaders will not compile
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#ifdef UNITY_MATERIAL_LIT
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#include "Lit/Lit.hlsl"
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#elif defined(UNITY_MATERIAL_UNLIT)
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#include "Unlit/Unlit.hlsl"
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#endif
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//-----------------------------------------------------------------------------
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// Define for GBuffer management
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//-----------------------------------------------------------------------------
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#ifdef GBUFFERMATERIAL_COUNT
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#if GBUFFERMATERIAL_COUNT == 2
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#define OUTPUT_GBUFFER(NAME) \
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out GBufferType0 MERGE_NAME(NAME, 0) : SV_Target0, \
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out GBufferType1 MERGE_NAME(NAME, 1) : SV_Target1
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#define ENCODE_INTO_GBUFFER(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, NAME) EncodeIntoGBuffer(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, MERGE_NAME(NAME,0), MERGE_NAME(NAME,1))
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#ifdef SHADOWS_SHADOWMASK
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#define OUTPUT_GBUFFER_SHADOWMASK(NAME) ,out float4 NAME : SV_Target2
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#endif
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#elif GBUFFERMATERIAL_COUNT == 3
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#define OUTPUT_GBUFFER(NAME) \
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out GBufferType0 MERGE_NAME(NAME, 0) : SV_Target0, \
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out GBufferType1 MERGE_NAME(NAME, 1) : SV_Target1, \
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out GBufferType2 MERGE_NAME(NAME, 2) : SV_Target2
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#define ENCODE_INTO_GBUFFER(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, NAME) EncodeIntoGBuffer(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, MERGE_NAME(NAME,0), MERGE_NAME(NAME,1), MERGE_NAME(NAME,2))
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#ifdef SHADOWS_SHADOWMASK
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#define OUTPUT_GBUFFER_SHADOWMASK(NAME) ,out float4 NAME : SV_Target3
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#endif
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#elif GBUFFERMATERIAL_COUNT == 4
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#define OUTPUT_GBUFFER(NAME) \
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out GBufferType0 MERGE_NAME(NAME, 0) : SV_Target0, \
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out GBufferType1 MERGE_NAME(NAME, 1) : SV_Target1, \
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out GBufferType2 MERGE_NAME(NAME, 2) : SV_Target2, \
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out GBufferType3 MERGE_NAME(NAME, 3) : SV_Target3
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#define ENCODE_INTO_GBUFFER(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, NAME) EncodeIntoGBuffer(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, MERGE_NAME(NAME, 0), MERGE_NAME(NAME, 1), MERGE_NAME(NAME, 2), MERGE_NAME(NAME, 3))
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#ifdef SHADOWS_SHADOWMASK
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#define OUTPUT_GBUFFER_SHADOWMASK(NAME) ,out float4 NAME : SV_Target4
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#endif
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#elif GBUFFERMATERIAL_COUNT == 5
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#define OUTPUT_GBUFFER(NAME) \
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out GBufferType0 MERGE_NAME(NAME, 0) : SV_Target0, \
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out GBufferType1 MERGE_NAME(NAME, 1) : SV_Target1, \
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out GBufferType2 MERGE_NAME(NAME, 2) : SV_Target2, \
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out GBufferType3 MERGE_NAME(NAME, 3) : SV_Target3, \
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out GBufferType4 MERGE_NAME(NAME, 4) : SV_Target4
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#define ENCODE_INTO_GBUFFER(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, NAME) EncodeIntoGBuffer(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, MERGE_NAME(NAME, 0), MERGE_NAME(NAME, 1), MERGE_NAME(NAME, 2), MERGE_NAME(NAME, 3), MERGE_NAME(NAME, 4))
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#ifdef SHADOWS_SHADOWMASK
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#define OUTPUT_GBUFFER_SHADOWMASK(NAME) ,out float4 NAME : SV_Target5
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#endif
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#elif GBUFFERMATERIAL_COUNT == 6
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#define OUTPUT_GBUFFER(NAME) \
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out GBufferType0 MERGE_NAME(NAME, 0) : SV_Target0, \
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out GBufferType1 MERGE_NAME(NAME, 1) : SV_Target1, \
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out GBufferType2 MERGE_NAME(NAME, 2) : SV_Target2, \
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out GBufferType3 MERGE_NAME(NAME, 3) : SV_Target3, \
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out GBufferType4 MERGE_NAME(NAME, 4) : SV_Target4, \
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out GBufferType5 MERGE_NAME(NAME, 5) : SV_Target5
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#define ENCODE_INTO_GBUFFER(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, NAME) EncodeIntoGBuffer(SURFACE_DATA, BAKE_DIFFUSE_LIGHTING, UNPOSITIONSS, MERGE_NAME(NAME, 0), MERGE_NAME(NAME, 1), MERGE_NAME(NAME, 2), MERGE_NAME(NAME, 3), MERGE_NAME(NAME, 4), MERGE_NAME(NAME, 5))
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#ifdef SHADOWS_SHADOWMASK
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#define OUTPUT_GBUFFER_SHADOWMASK(NAME) ,out float4 NAME : SV_Target6
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#endif
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#endif
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#define DECODE_FROM_GBUFFER(UNPOSITIONSS, FEATURE_FLAGS, BSDF_DATA, BAKE_DIFFUSE_LIGHTING) DecodeFromGBuffer(UNPOSITIONSS, FEATURE_FLAGS, BSDF_DATA, BAKE_DIFFUSE_LIGHTING)
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#define MATERIAL_FEATURE_FLAGS_FROM_GBUFFER(UNPOSITIONSS) MaterialFeatureFlagsFromGBuffer(UNPOSITIONSS)
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#ifdef SHADOWS_SHADOWMASK
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#define ENCODE_SHADOWMASK_INTO_GBUFFER(SHADOWMASK, NAME) EncodeShadowMask(SHADOWMASK, NAME)
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#else
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#define OUTPUT_GBUFFER_SHADOWMASK(NAME)
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#define ENCODE_SHADOWMASK_INTO_GBUFFER(SHADOWMASK, NAME)
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#endif
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#endif // #ifdef GBUFFERMATERIAL_COUNT
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#endif // UNITY_MATERIAL_INCLUDED
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