301 lines
12 KiB
HLSL
301 lines
12 KiB
HLSL
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#ifndef UNIVERSAL_REALTIME_LIGHTS_INCLUDED
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#define UNIVERSAL_REALTIME_LIGHTS_INCLUDED
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/AmbientOcclusion.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Input.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Shadows.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/LightCookie/LightCookie.hlsl"
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#include "Packages/com.unity.render-pipelines.universal/ShaderLibrary/Clustering.hlsl"
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// Abstraction over Light shading data.
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struct Light
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{
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half3 direction;
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half3 color;
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float distanceAttenuation; // full-float precision required on some platforms
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half shadowAttenuation;
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uint layerMask;
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};
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#if USE_FORWARD_PLUS && defined(LIGHTMAP_ON) && defined(LIGHTMAP_SHADOW_MIXING)
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#define FORWARD_PLUS_SUBTRACTIVE_LIGHT_CHECK if (_AdditionalLightsColor[lightIndex].a > 0.0h) continue;
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#else
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#define FORWARD_PLUS_SUBTRACTIVE_LIGHT_CHECK
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#endif
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#if USE_FORWARD_PLUS
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#define LIGHT_LOOP_BEGIN(lightCount) { \
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uint lightIndex; \
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ClusterIterator _urp_internal_clusterIterator = ClusterInit(inputData.normalizedScreenSpaceUV, inputData.positionWS, 0); \
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[loop] while (ClusterNext(_urp_internal_clusterIterator, lightIndex)) { \
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lightIndex += URP_FP_DIRECTIONAL_LIGHTS_COUNT; \
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FORWARD_PLUS_SUBTRACTIVE_LIGHT_CHECK
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#define LIGHT_LOOP_END } }
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#else
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#define LIGHT_LOOP_BEGIN(lightCount) \
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for (uint lightIndex = 0u; lightIndex < lightCount; ++lightIndex) {
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#define LIGHT_LOOP_END }
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#endif
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///////////////////////////////////////////////////////////////////////////////
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// Attenuation Functions /
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///////////////////////////////////////////////////////////////////////////////
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// Matches Unity Vanilla HINT_NICE_QUALITY attenuation
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// Attenuation smoothly decreases to light range.
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float DistanceAttenuation(float distanceSqr, half2 distanceAttenuation)
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{
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// We use a shared distance attenuation for additional directional and puctual lights
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// for directional lights attenuation will be 1
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float lightAtten = rcp(distanceSqr);
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float2 distanceAttenuationFloat = float2(distanceAttenuation);
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// Use the smoothing factor also used in the Unity lightmapper.
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half factor = half(distanceSqr * distanceAttenuationFloat.x);
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half smoothFactor = saturate(half(1.0) - factor * factor);
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smoothFactor = smoothFactor * smoothFactor;
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return lightAtten * smoothFactor;
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}
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half AngleAttenuation(half3 spotDirection, half3 lightDirection, half2 spotAttenuation)
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{
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// Spot Attenuation with a linear falloff can be defined as
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// (SdotL - cosOuterAngle) / (cosInnerAngle - cosOuterAngle)
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// This can be rewritten as
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// invAngleRange = 1.0 / (cosInnerAngle - cosOuterAngle)
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// SdotL * invAngleRange + (-cosOuterAngle * invAngleRange)
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// SdotL * spotAttenuation.x + spotAttenuation.y
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// If we precompute the terms in a MAD instruction
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half SdotL = dot(spotDirection, lightDirection);
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half atten = saturate(SdotL * spotAttenuation.x + spotAttenuation.y);
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return atten * atten;
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}
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///////////////////////////////////////////////////////////////////////////////
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// Light Abstraction //
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///////////////////////////////////////////////////////////////////////////////
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Light GetMainLight()
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{
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Light light;
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light.direction = half3(_MainLightPosition.xyz);
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#if USE_FORWARD_PLUS
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#if defined(LIGHTMAP_ON) && defined(LIGHTMAP_SHADOW_MIXING)
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light.distanceAttenuation = _MainLightColor.a;
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#else
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light.distanceAttenuation = 1.0;
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#endif
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#else
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light.distanceAttenuation = unity_LightData.z; // unity_LightData.z is 1 when not culled by the culling mask, otherwise 0.
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#endif
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light.shadowAttenuation = 1.0;
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light.color = _MainLightColor.rgb;
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light.layerMask = _MainLightLayerMask;
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return light;
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}
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Light GetMainLight(float4 shadowCoord)
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{
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Light light = GetMainLight();
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light.shadowAttenuation = MainLightRealtimeShadow(shadowCoord);
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return light;
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}
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Light GetMainLight(float4 shadowCoord, float3 positionWS, half4 shadowMask)
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{
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Light light = GetMainLight();
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light.shadowAttenuation = MainLightShadow(shadowCoord, positionWS, shadowMask, _MainLightOcclusionProbes);
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#if defined(_LIGHT_COOKIES)
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real3 cookieColor = SampleMainLightCookie(positionWS);
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light.color *= cookieColor;
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#endif
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return light;
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}
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Light GetMainLight(InputData inputData, half4 shadowMask, AmbientOcclusionFactor aoFactor)
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{
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Light light = GetMainLight(inputData.shadowCoord, inputData.positionWS, shadowMask);
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#if defined(_SCREEN_SPACE_OCCLUSION) && !defined(_SURFACE_TYPE_TRANSPARENT)
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if (IsLightingFeatureEnabled(DEBUGLIGHTINGFEATUREFLAGS_AMBIENT_OCCLUSION))
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{
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light.color *= aoFactor.directAmbientOcclusion;
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}
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#endif
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return light;
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}
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// Fills a light struct given a perObjectLightIndex
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Light GetAdditionalPerObjectLight(int perObjectLightIndex, float3 positionWS)
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{
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// Abstraction over Light input constants
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#if USE_STRUCTURED_BUFFER_FOR_LIGHT_DATA
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float4 lightPositionWS = _AdditionalLightsBuffer[perObjectLightIndex].position;
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half3 color = _AdditionalLightsBuffer[perObjectLightIndex].color.rgb;
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half4 distanceAndSpotAttenuation = _AdditionalLightsBuffer[perObjectLightIndex].attenuation;
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half4 spotDirection = _AdditionalLightsBuffer[perObjectLightIndex].spotDirection;
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uint lightLayerMask = _AdditionalLightsBuffer[perObjectLightIndex].layerMask;
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#else
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float4 lightPositionWS = _AdditionalLightsPosition[perObjectLightIndex];
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half3 color = _AdditionalLightsColor[perObjectLightIndex].rgb;
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half4 distanceAndSpotAttenuation = _AdditionalLightsAttenuation[perObjectLightIndex];
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half4 spotDirection = _AdditionalLightsSpotDir[perObjectLightIndex];
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uint lightLayerMask = asuint(_AdditionalLightsLayerMasks[perObjectLightIndex]);
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#endif
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// Directional lights store direction in lightPosition.xyz and have .w set to 0.0.
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// This way the following code will work for both directional and punctual lights.
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float3 lightVector = lightPositionWS.xyz - positionWS * lightPositionWS.w;
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float distanceSqr = max(dot(lightVector, lightVector), HALF_MIN);
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half3 lightDirection = half3(lightVector * rsqrt(distanceSqr));
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// full-float precision required on some platforms
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float attenuation = DistanceAttenuation(distanceSqr, distanceAndSpotAttenuation.xy) * AngleAttenuation(spotDirection.xyz, lightDirection, distanceAndSpotAttenuation.zw);
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Light light;
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light.direction = lightDirection;
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light.distanceAttenuation = attenuation;
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light.shadowAttenuation = 1.0; // This value can later be overridden in GetAdditionalLight(uint i, float3 positionWS, half4 shadowMask)
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light.color = color;
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light.layerMask = lightLayerMask;
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return light;
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}
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uint GetPerObjectLightIndexOffset()
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{
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#if USE_STRUCTURED_BUFFER_FOR_LIGHT_DATA
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return uint(unity_LightData.x);
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#else
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return 0;
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#endif
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}
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// Returns a per-object index given a loop index.
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// This abstract the underlying data implementation for storing lights/light indices
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int GetPerObjectLightIndex(uint index)
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{
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/////////////////////////////////////////////////////////////////////////////////////////////
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// Structured Buffer Path /
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// /
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// Lights and light indices are stored in StructuredBuffer. We can just index them. /
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// Currently all non-mobile platforms take this path :( /
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// There are limitation in mobile GPUs to use SSBO (performance / no vertex shader support) /
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/////////////////////////////////////////////////////////////////////////////////////////////
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#if USE_STRUCTURED_BUFFER_FOR_LIGHT_DATA
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uint offset = uint(unity_LightData.x);
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return _AdditionalLightsIndices[offset + index];
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/////////////////////////////////////////////////////////////////////////////////////////////
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// UBO path /
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// /
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// We store 8 light indices in half4 unity_LightIndices[2]; /
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// Due to memory alignment unity doesn't support int[] or float[] /
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// Even trying to reinterpret cast the unity_LightIndices to float[] won't work /
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// it will cast to float4[] and create extra register pressure. :( /
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/////////////////////////////////////////////////////////////////////////////////////////////
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#else
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// since index is uint shader compiler will implement
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// div & mod as bitfield ops (shift and mask).
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// TODO: Can we index a float4? Currently compiler is
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// replacing unity_LightIndicesX[i] with a dp4 with identity matrix.
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// u_xlat16_40 = dot(unity_LightIndices[int(u_xlatu13)], ImmCB_0_0_0[u_xlati1]);
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// This increases both arithmetic and register pressure.
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//
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// NOTE: min16float4 bug workaround.
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// Take the "vec4" part into float4 tmp variable in order to force float4 math.
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// It appears indexing half4 as min16float4 on DX11 can fail. (dp4 {min16f})
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float4 tmp = unity_LightIndices[index / 4];
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return int(tmp[index % 4]);
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#endif
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}
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// Fills a light struct given a loop i index. This will convert the i
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// index to a perObjectLightIndex
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Light GetAdditionalLight(uint i, float3 positionWS)
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{
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#if USE_FORWARD_PLUS
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int lightIndex = i;
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#else
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int lightIndex = GetPerObjectLightIndex(i);
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#endif
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return GetAdditionalPerObjectLight(lightIndex, positionWS);
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}
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Light GetAdditionalLight(uint i, float3 positionWS, half4 shadowMask)
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{
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#if USE_FORWARD_PLUS
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int lightIndex = i;
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#else
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int lightIndex = GetPerObjectLightIndex(i);
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#endif
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Light light = GetAdditionalPerObjectLight(lightIndex, positionWS);
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#if USE_STRUCTURED_BUFFER_FOR_LIGHT_DATA
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half4 occlusionProbeChannels = _AdditionalLightsBuffer[lightIndex].occlusionProbeChannels;
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#else
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half4 occlusionProbeChannels = _AdditionalLightsOcclusionProbes[lightIndex];
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#endif
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light.shadowAttenuation = AdditionalLightShadow(lightIndex, positionWS, light.direction, shadowMask, occlusionProbeChannels);
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#if defined(_LIGHT_COOKIES)
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real3 cookieColor = SampleAdditionalLightCookie(lightIndex, positionWS);
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light.color *= cookieColor;
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#endif
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return light;
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}
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Light GetAdditionalLight(uint i, InputData inputData, half4 shadowMask, AmbientOcclusionFactor aoFactor)
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{
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Light light = GetAdditionalLight(i, inputData.positionWS, shadowMask);
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#if defined(_SCREEN_SPACE_OCCLUSION) && !defined(_SURFACE_TYPE_TRANSPARENT)
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if (IsLightingFeatureEnabled(DEBUGLIGHTINGFEATUREFLAGS_AMBIENT_OCCLUSION))
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{
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light.color *= aoFactor.directAmbientOcclusion;
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}
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#endif
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return light;
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}
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int GetAdditionalLightsCount()
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{
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#if USE_FORWARD_PLUS
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// Counting the number of lights in clustered requires traversing the bit list, and is not needed up front.
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return 0;
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#else
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// TODO: we need to expose in SRP api an ability for the pipeline cap the amount of lights
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// in the culling. This way we could do the loop branch with an uniform
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// This would be helpful to support baking exceeding lights in SH as well
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return int(min(_AdditionalLightsCount.x, unity_LightData.y));
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#endif
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}
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half4 CalculateShadowMask(InputData inputData)
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{
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// To ensure backward compatibility we have to avoid using shadowMask input, as it is not present in older shaders
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#if defined(SHADOWS_SHADOWMASK) && defined(LIGHTMAP_ON)
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half4 shadowMask = inputData.shadowMask; // Shadowmask was sampled from lightmap
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#elif !defined(LIGHTMAP_ON) && (defined(PROBE_VOLUMES_L1) || defined(PROBE_VOLUMES_L2))
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half4 shadowMask = inputData.shadowMask; // Shadowmask (probe occlusion) was sampled from APV
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#elif !defined (LIGHTMAP_ON)
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half4 shadowMask = unity_ProbesOcclusion; // Sample shadowmask (probe occlusion) from legacy probes
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#else
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half4 shadowMask = half4(1, 1, 1, 1); // Fallback shadowmask, fully unoccluded
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#endif
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return shadowMask;
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}
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#endif
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