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Add area light support with Fresnel and Disney Diffuse

/main
Evgenii Golubev 8 年前
当前提交
105f41c5
共有 23 个文件被更改，包括 3118 次插入 和 1046 次删除
  1. 1
      .gitignore
  2. 34
      Assets/ScriptableRenderLoop/AdditionalLightData.cs
  3. 88
      Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.cs
  4. 6
      Assets/ScriptableRenderLoop/HDRenderLoop/Lighting/SinglePass/SinglePass.hlsl
  5. 46
      Assets/ScriptableRenderLoop/HDRenderLoop/Lighting/SinglePass/SinglePassLoop.hlsl
  6. 2
      Assets/ScriptableRenderLoop/HDRenderLoop/Material.meta
  7. 2
      Assets/ScriptableRenderLoop/HDRenderLoop/Material/Lit.meta
  8. 980
      Assets/ScriptableRenderLoop/HDRenderLoop/Material/Lit/Lit.cs
  9. 135
      Assets/ScriptableRenderLoop/HDRenderLoop/Material/Lit/Lit.hlsl
  10. 29
      Assets/ScriptableRenderLoop/ShaderLibrary/AreaLighting.hlsl
  11. 688
      Assets/TestScenes/HDTest/HDRenderLoopTest.unity
  12. 9
      Assets/ScriptableRenderLoop/HDRenderLoop/Shaders.meta
  13. 92
      Assets/TestScenes/HDTest/Material/HDRenderLoopMaterials/unlitTwoSided.mat
  14. 8
      Assets/TestScenes/HDTest/Material/HDRenderLoopMaterials/unlitTwoSided.mat.meta
  15. 9
      Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material.meta
  16. 9
      Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Lit.meta
  17. 1001
      Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Lit/LtcData.DisneyDiffuse.cs
  18. 12
      Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Lit/LtcData.DisneyDiffuse.cs.meta
  19. 1001
      Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Lit/LtcData.GGX.cs
  20. 12
      Assets/ScriptableRenderLoop/HDRenderLoop/Shaders/Material/Lit/LtcData.GGX.cs.meta

1
.gitignore
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Assets/UnityHDRI.meta
Assets/UnityHDRI/Gareoult/GareoultWhiteBalanced.exr
obj/Debug/Assembly-CSharp.csproj.FileListAbsolute.txt

34
Assets/ScriptableRenderLoop/AdditionalLightData.cs
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public bool affectDiffuse = true;
public bool affectSpecular = true;
// Area Light Hack
public bool treatAsAreaLight = false;
public bool isDoubleSided = false;
[RangeAttribute(0.0f, 20.0f)]
public float areaLightLength = 0.0f;
[RangeAttribute(0.0f, 20.0f)]
public float areaLightWidth = 0.0f;
public static float GetInnerSpotPercent01(AdditionalLightData lightData)
{
if (lightData != null)

return lightData.shadowResolution;
else
return DefaultShadowResolution;
}
public static bool GetTreatAsAreaLight(AdditionalLightData lightData)
{
if (lightData != null)
return lightData.treatAsAreaLight;
else
return false;
}
public static bool GetIsDoubleSided(AdditionalLightData lightData)
{
if (lightData != null)
return lightData.isDoubleSided;
else
return false;
}
public static Vector2 GetAreaLightDimensions(AdditionalLightData lightData)
{
if (lightData != null)
return new Vector2(lightData.areaLightLength, lightData.areaLightWidth);
else
return new Vector2(0.0f, 0.0f);
}
}
}

88
Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.cs
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private ComputeBuffer s_punctualLightList;
private ComputeBuffer s_envLightList;
private ComputeBuffer s_areaLightList;
private ComputeBuffer s_punctualShadowList;
private TextureCacheCubemap m_cubeReflTexArray;

if (s_punctualLightList != null)
s_punctualLightList.Release();
if (s_areaLightList != null)
s_areaLightList.Release();
if (s_punctualShadowList != null)
s_punctualShadowList.Release();

{
ClearComputeBuffers();
s_CameraColorBuffer = Shader.PropertyToID("_CameraColorTexture");
s_CameraDepthBuffer = Shader.PropertyToID("_CameraDepthTexture");
s_CameraColorBuffer = Shader.PropertyToID("_CameraColorTexture");
s_CameraDepthBuffer = Shader.PropertyToID("_CameraDepthTexture");
s_punctualLightList = new ComputeBuffer(MaxLights, System.Runtime.InteropServices.Marshal.SizeOf(typeof(PunctualLightData)));
s_envLightList = new ComputeBuffer(MaxLights, System.Runtime.InteropServices.Marshal.SizeOf(typeof(EnvLightData)));
s_punctualLightList = new ComputeBuffer(MaxLights, System.Runtime.InteropServices.Marshal.SizeOf(typeof(PunctualLightData)));
s_areaLightList = new ComputeBuffer(MaxLights, System.Runtime.InteropServices.Marshal.SizeOf(typeof(AreaLightData)));
s_envLightList = new ComputeBuffer(MaxLights, System.Runtime.InteropServices.Marshal.SizeOf(typeof(EnvLightData)));
m_DeferredMaterial = CreateEngineMaterial("Hidden/HDRenderLoop/Deferred");
m_FinalPassMaterial = CreateEngineMaterial("Hidden/HDRenderLoop/FinalPass");
m_DeferredMaterial = CreateEngineMaterial("Hidden/HDRenderLoop/Deferred");
m_FinalPassMaterial = CreateEngineMaterial("Hidden/HDRenderLoop/FinalPass");
// Debug
m_DebugViewMaterialGBuffer = CreateEngineMaterial("Hidden/HDRenderLoop/DebugViewMaterialGBuffer");

m_LitRenderLoop.OnDisable();
s_punctualLightList.Release();
s_areaLightList.Release();
if (m_DeferredMaterial) DestroyImmediate(m_DeferredMaterial);
if (m_DeferredMaterial) DestroyImmediate(m_DeferredMaterial);
if (m_FinalPassMaterial) DestroyImmediate(m_FinalPassMaterial);
m_cubeReflTexArray.Release();

void UpdatePunctualLights(VisibleLight[] visibleLights, ref ShadowOutput shadowOutput)
{
var lights = new List<PunctualLightData>();
var pLights = new List<PunctualLightData>();
var aLights = new List<AreaLightData>();
for (int lightIndex = 0; lightIndex < Math.Min(visibleLights.Length, MaxLights); lightIndex++)
for (int lightIndex = 0, numLights = Math.Min(visibleLights.Length, MaxLights); lightIndex < numLights; ++lightIndex)
if (light.lightType != LightType.Spot && light.lightType != LightType.Point && light.lightType != LightType.Directional)
if (light.lightType == LightType.Area) {
// Skip area lights which are currently only used for baking.
}
var additionalLightData = light.light.GetComponent<AdditionalLightData>();
// Correct intensity calculation (different from Unity)
var lightColorR = light.light.intensity * Mathf.GammaToLinearSpace(light.light.color.r);
var lightColorG = light.light.intensity * Mathf.GammaToLinearSpace(light.light.color.g);
var lightColorB = light.light.intensity * Mathf.GammaToLinearSpace(light.light.color.b);
var additionalData = light.light.GetComponent<AdditionalLightData>();
// Test whether we should treat this punctual light as an area light.
// It's a temporary hack until the proper UI support is added.
if (AdditionalLightData.GetTreatAsAreaLight(additionalData))
{
AreaLightData lightData = new AreaLightData();
// TODO: add AreaShapeType.Line support for small widths.
lightData.shapeType = AreaShapeType.Rectangle;
lightData.size = new Vector2(additionalData.areaLightLength, additionalData.areaLightWidth);
lightData.twoSided = additionalData.isDoubleSided ? 1.0f : 0.0f;
lightData.positionWS = light.light.transform.position;
lightData.forward = light.light.transform.forward; // Note: Light direction is oriented backward (-Z)
lightData.up = light.light.transform.up;
lightData.right = light.light.transform.right;
lightData.color = new Vector3(lightColorR, lightColorG, lightColorB);
lightData.diffuseScale = additionalData.affectDiffuse ? 1.0f : 0.0f;
lightData.specularScale = additionalData.affectSpecular ? 1.0f : 0.0f;
lightData.shadowDimmer = additionalData.shadowDimmer;
lightData.invSqrAttenuationRadius = 1.0f / (light.range * light.range);
aLights.Add(lightData);
// TODO: shadows.
continue;
}
var l = new PunctualLightData();

l.invSqrAttenuationRadius = 1.0f / (light.range * light.range);
}
// Correct intensity calculation (Different from Unity)
var lightColorR = light.light.intensity * Mathf.GammaToLinearSpace(light.light.color.r);
var lightColorG = light.light.intensity * Mathf.GammaToLinearSpace(light.light.color.g);
var lightColorB = light.light.intensity * Mathf.GammaToLinearSpace(light.light.color.b);
l.color.Set(lightColorR, lightColorG, lightColorB);

{
var spotAngle = light.light.spotAngle;
var innerConePercent = AdditionalLightData.GetInnerSpotPercent01(additionalLightData);
var innerConePercent = AdditionalLightData.GetInnerSpotPercent01(additionalData);
var cosSpotOuterHalfAngle = Mathf.Clamp(Mathf.Cos(spotAngle * 0.5f * Mathf.Deg2Rad), 0.0f, 1.0f);
var cosSpotInnerHalfAngle = Mathf.Clamp(Mathf.Cos(spotAngle * 0.5f * innerConePercent * Mathf.Deg2Rad), 0.0f, 1.0f); // inner cone

l.angleOffset = 2.0f;
}
l.diffuseScale = AdditionalLightData.GetAffectDiffuse(additionalLightData) ? 1.0f : 0.0f;
l.specularScale = AdditionalLightData.GetAffectSpecular(additionalLightData) ? 1.0f : 0.0f;
l.shadowDimmer = AdditionalLightData.GetShadowDimmer(additionalLightData);
l.diffuseScale = AdditionalLightData.GetAffectDiffuse(additionalData) ? 1.0f : 0.0f;
l.specularScale = AdditionalLightData.GetAffectSpecular(additionalData) ? 1.0f : 0.0f;
l.shadowDimmer = AdditionalLightData.GetShadowDimmer(additionalData);
l.IESIndex = -1;
l.cookieIndex = -1;

}
}
lights.Add(l);
pLights.Add(l);
s_punctualLightList.SetData(lights.ToArray());
s_punctualLightList.SetData(pLights.ToArray());
s_areaLightList.SetData(aLights.ToArray());
Shader.SetGlobalInt("_PunctualLightCount", lights.Count);
Shader.SetGlobalBuffer("_AreaLightList", s_areaLightList);
Shader.SetGlobalInt("_PunctualLightCount", pLights.Count);
Shader.SetGlobalInt("_AreaLightCount", aLights.Count);
Shader.SetGlobalBuffer("_PunctualShadowList", s_punctualShadowList);
}

6
Assets/ScriptableRenderLoop/HDRenderLoop/Lighting/SinglePass/SinglePass.hlsl
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// Constant and structure declaration
// ----------------------------------------------------------------------------
StructuredBuffer<PunctualLightData> _PunctualLightList;
StructuredBuffer<EnvLightData> _EnvLightList;
StructuredBuffer<PunctualLightData> _PunctualLightList;
StructuredBuffer<AreaLightData> _AreaLightList;
StructuredBuffer<EnvLightData> _EnvLightList;
StructuredBuffer<PunctualShadowData> _PunctualShadowList;
//TEXTURE2D_ARRAY(_ShadowArray);

CBUFFER_START(UnityPerLightLoop)
int _PunctualLightCount;
int _AreaLightCount;
int _EnvLightCount;
EnvLightData _EnvLightSky;
float4 _ShadowMapSize;

46
Assets/ScriptableRenderLoop/HDRenderLoop/Lighting/SinglePass/SinglePassLoop.hlsl
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LightLoopContext context;
ZERO_INITIALIZE(LightLoopContext, context);
diffuseLighting = float4(0.0, 0.0, 0.0, 0.0);
diffuseLighting = float4(0.0, 0.0, 0.0, 0.0);
for (int i = 0; i < _PunctualLightCount; ++i)
int i = 0; // Declare once to avoid the D3D11 compiler warning.
for (i = 0; i < _PunctualLightCount; ++i)
float4 localDiffuseLighting;
float4 localSpecularLighting;
EvaluateBSDF_Punctual(context, V, positionWS, prelightData, _PunctualLightList[i], bsdfData, localDiffuseLighting, localSpecularLighting);
diffuseLighting += localDiffuseLighting;
float4 localDiffuseLighting, localSpecularLighting;
EvaluateBSDF_Punctual(context, V, positionWS, prelightData, _PunctualLightList[i], bsdfData,
localDiffuseLighting, localSpecularLighting);
diffuseLighting += localDiffuseLighting;
/*
for (int i = 0; i < 4; ++i)
for (i = 0; i < _AreaLightCount; ++i)
float4 localDiffuseLighting;
float4 localSpecularLighting;
EvaluateBSDF_Area(0, V, positionWS, areaLightData[i], bsdfData, localDiffuseLighting, localSpecularLighting);
diffuseLighting += localDiffuseLighting;
specularLighting += localSpecularLighting;
float4 localDiffuseLighting, localSpecularLighting;
EvaluateBSDF_Area(context, V, positionWS, prelightData, _AreaLightList[i], bsdfData,
localDiffuseLighting, localSpecularLighting);
diffuseLighting += localDiffuseLighting;
specularLighting += localSpecularLighting;
*/
float4 iblDiffuseLighting = float4(0.0, 0.0, 0.0, 0.0);
float4 iblDiffuseLighting = float4(0.0, 0.0, 0.0, 0.0);
for (int j = 0; j < _EnvLightCount; ++j)
for (i = 0; i < _EnvLightCount; ++i)
float4 localDiffuseLighting;
float4 localSpecularLighting;
float4 localDiffuseLighting, localSpecularLighting;
EvaluateBSDF_Env(context, V, positionWS, prelightData, _EnvLightList[j], bsdfData, localDiffuseLighting, localSpecularLighting);
EvaluateBSDF_Env(context, V, positionWS, prelightData, _EnvLightList[i], bsdfData, localDiffuseLighting, localSpecularLighting);
iblDiffuseLighting.rgb = lerp(iblDiffuseLighting.rgb, localDiffuseLighting.rgb, localDiffuseLighting.a); // Should be remove by the compiler if it is smart as all is constant 0
iblSpecularLighting.rgb = lerp(iblSpecularLighting.rgb, localSpecularLighting.rgb, localSpecularLighting.a);
}

{
float4 localDiffuseLighting;
float4 localSpecularLighting;
float4 localDiffuseLighting, localSpecularLighting;
context.sampleReflection = SINGLE_PASS_CONTEXT_SAMPLE_SKY;
EvaluateBSDF_Env(context, V, positionWS, prelightData, _EnvLightSky, bsdfData, localDiffuseLighting, localSpecularLighting);
iblDiffuseLighting.rgb = lerp(iblDiffuseLighting.rgb, localDiffuseLighting.rgb, localDiffuseLighting.a); // Should be remove by the compiler if it is smart as all is constant 0

diffuseLighting += iblDiffuseLighting;
diffuseLighting += iblDiffuseLighting;
specularLighting += iblSpecularLighting;
diffuseLighting.rgb += bakeDiffuseLighting;

2
Assets/ScriptableRenderLoop/HDRenderLoop/Material.meta
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guid: 752ba4c5a264906428ff58cb5973e10a
folderAsset: yes
timeCreated: 1474297943
licenseType: Pro

2
Assets/ScriptableRenderLoop/HDRenderLoop/Material/Lit.meta
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980
Assets/ScriptableRenderLoop/HDRenderLoop/Material/Lit/Lit.cs
文件差异内容过多而无法显示
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135
Assets/ScriptableRenderLoop/HDRenderLoop/Material/Lit/Lit.hlsl
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// Use optimization of Precomputing LambdaV
// TODO: Test if this is a win
// #define LIT_USE_BSDF_PRE_LAMBDAV
// TODO: Check if anisotropy with a dynamic if on anisotropy > 0 is performant. Because it may mean we always calculate both isotropy and anisotropy case.
// Maybe we should always calculate anisotropy in case of standard ? Don't think the compile can optimize correctly.
// TODO: Check if anisotropy with a dynamic if on anisotropy > 0 is performant. Because it may mean we always calculate both isotrpy and anisotropy case.
// Maybe we should always calculate anisotropy in case of standard ? Don't think the compile can optimize correctly.
// TODO: How can I declare a sampler for this one that is bilinear filtering
SAMPLER2D(sampler_PreIntegratedFGD);
#define SRL_PointSampler sampler_PreIntegratedFGD // Used for all textures
// TODO: This one should be set into a constant Buffer at pass frequency (with _Screensize)
TEXTURE2D(_PreIntegratedFGD);
TEXTURE2D(_LtcGGXMatrix); // RGBA
TEXTURE2D(_LtcDisneyDiffuseMatrix); // RGBA
TEXTURE2D(_LtcMultiGGXFresnelDisneyDiffuse); // RGB, A unused
// Helper functions/variable specific to this materia
// Helper functions/variable specific to this material
//-----------------------------------------------------------------------------
float PackMaterialId(int materialId)

return int(round(f * 3.0));
}
// TODO: How can I declare a sampler for this one that is bilinear filtering
// TODO: This one should be set into a constant Buffer at pass frequency (with _Screensize)
TEXTURE2D(_PreIntegratedFGD);
SAMPLER2D(sampler_PreIntegratedFGD);
TEXTURE2D(_LtcGGXMatrix);
SAMPLER2D(sampler_LtcGGXMatrix);
TEXTURE2D(_LtcGGXMagnitude);
SAMPLER2D(sampler_LtcGGXMagnitude);
// For image based lighting, a part of the BSDF is pre-integrated.
// This is done both for specular and diffuse (in case of DisneyDiffuse)
void GetPreIntegratedFGD(float NdotV, float perceptualRoughness, float3 fresnel0, out float3 specularFGD, out float diffuseFGD)

// _PreIntegratedFGD.y = Gv * Fc
// Pre integrate DisneyDiffuse FGD:
// _PreIntegratedFGD.z = DisneyDiffuse
float3 preFGD = SAMPLE_TEXTURE2D_LOD(_PreIntegratedFGD, sampler_PreIntegratedFGD, float2(NdotV, perceptualRoughness), 0).xyz;
float3 preFGD = SAMPLE_TEXTURE2D_LOD(_PreIntegratedFGD, SRL_PointSampler, float2(NdotV, perceptualRoughness), 0).xyz;
// f0 * Gv * (1 - Fc) + Gv * Fc
specularFGD = fresnel0 * preFGD.x + preFGD.y;

// image based lighting
// These variables aim to be use with EvaluateBSDF_Env
float3 iblNormalWS; // Normal to be use with image based lighting
float3 iblR; // Reflction vector, same as above.
float3 iblR; // Reflection vector, same as above.
float3 specularFGD; // Store preconvole BRDF for both specular and diffuse
float diffuseFGD;

// area light
float3x3 minV;
float ltcGGXMagnitude;
float3x3 ltcXformGGX; // TODO: make sure the compiler not wasting VGPRs on constants
float3x3 ltcXformDisneyDiffuse; // TODO: make sure the compiler not wasting VGPRs on constants
float ltcGGXFresnelMagnitudeDiff; // The difference of magnitudes of GGX and Fresnel
float ltcGGXFresnelMagnitude;
float ltcDisneyDiffuseMagnitude;
// Shadow (sampling rotation disc)
float2 unPositionSS;

// Get the inverse LTC matrix for GGX
// Note we load the matrix transpose (avoid to have to transpose it in shader)
preLightData.minV = 0.0;
preLightData.minV._m22 = 1.0;
preLightData.minV._m00_m02_m11_m20 = SAMPLE_TEXTURE2D_LOD(_LtcGGXMatrix, sampler_LtcGGXMatrix, uv, 0);
preLightData.ltcXformGGX = 0.0;
preLightData.ltcXformGGX._m22 = 1.0;
preLightData.ltcXformGGX._m00_m02_m11_m20 = SAMPLE_TEXTURE2D_LOD(_LtcGGXMatrix, SRL_PointSampler, uv, 0);
// Get the inverse LTC matrix for Disney Diffuse
// Note we load the matrix transpose (avoid to have to transpose it in shader)
preLightData.ltcXformDisneyDiffuse = 0.0;
preLightData.ltcXformDisneyDiffuse._m22 = 1.0;
preLightData.ltcXformDisneyDiffuse._m00_m02_m11_m20 = SAMPLE_TEXTURE2D_LOD(_LtcDisneyDiffuseMatrix, SRL_PointSampler, uv, 0);
preLightData.ltcGGXMagnitude = SAMPLE_TEXTURE2D_LOD(_LtcGGXMagnitude, sampler_LtcGGXMagnitude, uv, 0).w;
preLightData.ltcGGXFresnelMagnitudeDiff = SAMPLE_TEXTURE2D_LOD(_LtcMultiGGXFresnelDisneyDiffuse, SRL_PointSampler, uv, 0).r;
preLightData.ltcGGXFresnelMagnitude = SAMPLE_TEXTURE2D_LOD(_LtcMultiGGXFresnelDisneyDiffuse, SRL_PointSampler, uv, 0).g;
preLightData.ltcDisneyDiffuseMagnitude = SAMPLE_TEXTURE2D_LOD(_LtcMultiGGXFresnelDisneyDiffuse, SRL_PointSampler, uv, 0).b;
// Shadow
preLightData.unPositionSS = coord.unPositionSS;

#endif
D = D_GGX(NdotH, bsdfData.roughness);
}
specularLighting.rgb = F * Vis * D;
specularLighting.rgb = F * (Vis * D);
#ifdef LIT_DIFFUSE_LAMBERT_BRDF
float diffuseTerm = Lambert();
#else

float3 unL = P - positionWS;
float sqrDist = dot(unL, unL);
float3 L = normalize(unL);
// Cosine of the angle between the light direction and the normal of the light's surface.
float cosLNs = dot(-L, Ns);
cosLNs = lightData.twoSided ? abs(cosLNs) : saturate(cosLNs);
float illuminance = saturate(dot(Ns, -L)) * saturate(dot(bsdfData.normalWS, L)) / (sqrDist * lightPdf);
float illuminance = cosLNs * saturate(dot(bsdfData.normalWS, L)) / (sqrDist * lightPdf);
float3 localDiffuseLighting = float3(0.0, 0.0, 0.0);
float3 localSpecularLighting = float3(0.0, 0.0, 0.0);

void EvaluateBSDF_Area( LightLoopContext lightLoopContext,
float3 V, float3 positionWS, PreLightData preLightData, AreaLightData lightData, BSDFData bsdfData,
out float4 diffuseLighting,
out float4 specularLighting)
out float4 diffuseLighting, out float4 specularLighting)
float halfWidth = lightData.size.x * 0.5;
float halfWidth = lightData.size.x * 0.5;
float3 p0 = lightData.positionWS + lightData.right * -halfWidth + lightData.up * halfHeight;
float3 p0 = lightData.positionWS + lightData.right * -halfWidth + lightData.up * halfHeight;
float3 p2 = lightData.positionWS + lightData.right * halfWidth + lightData.up * -halfHeight;
float3 p3 = lightData.positionWS + lightData.right * halfWidth + lightData.up * halfHeight;
float3 p2 = lightData.positionWS + lightData.right * halfWidth + lightData.up * -halfHeight;
float3 p3 = lightData.positionWS + lightData.right * halfWidth + lightData.up * halfHeight;
float4x3 L = matL - float4x3(positionWS, positionWS, positionWS, positionWS);
float4x3 L = matL - float4x3(positionWS, positionWS, positionWS, positionWS);
diffuseLighting = float4(0.0, 0.0, 0.0, 1.0);
specularLighting = float4(0.0, 0.0, 0.0, 1.0);
float ltcValue;
// Evaluate the diffuse part.
{
#ifdef DIFFUSE_LAMBERT_BRDF
static const float3x3 identity3x3 = {1.0, 0.0, 0.0,
0.0, 1.0, 0.0,
0.0, 0.0, 1.0};
ltcValue = LTCEvaluate(V, bsdfData.normalWS, identity3x3, L, lightData.twoSided);
#else
ltcValue = LTCEvaluate(V, bsdfData.normalWS, preLightData.ltcXformDisneyDiffuse, L, lightData.twoSided);
#endif
if (ltcValue == 0.0)
{
// The polygon is either back-facing, or has been completely clipped.
return;
}
#ifndef DIFFUSE_LAMBERT_BRDF
// TODO: verify that we do not need to multiply by PI.
ltcValue *= preLightData.ltcDisneyDiffuseMagnitude;
#endif
// TODO: Can we get early out based on diffuse computation ? (if all point are clip)
diffuseLighting = float4(0.0f, 0.0f, 0.0f, 1.0f);
specularLighting = float4(0.0f, 0.0f, 0.0f, 1.0f);
ltcValue *= lightData.diffuseScale;
diffuseLighting.rgb = bsdfData.diffuseColor * lightData.color * ltcValue;
}
// TODO: Fresnel is missing here but should be present
specularLighting.rgb = LTCEvaluate(V, bsdfData.normalWS, preLightData.minV, L, lightData.twoSided) * preLightData.ltcGGXMagnitude;
// Evaluate the specular part.
{
float3 fresnelTerm = bsdfData.fresnel0 * preLightData.ltcGGXFresnelMagnitudeDiff
+ (float3)preLightData.ltcGGXFresnelMagnitude;
//#ifdef LIT_DIFFUSE_LAMBERT_BRDF
// Lambert diffuse term (here it should be Disney)
float3x3 identity = 0;
identity._m00_m11_m22 = 1.0;
diffuseLighting.rgb = LTCEvaluate(V, bsdfData.normalWS, identity, L, lightData.twoSided) * bsdfData.diffuseColor;
//#else
// TODO: Disney
//#endif
// Divide all by 2 PI as it is Lambert integration for diffuse
diffuseLighting.rgb *= lightData.color * INV_TWO_PI * lightData.diffuseScale;
specularLighting.rgb *= lightData.color * INV_TWO_PI * lightData.specularScale;
ltcValue = LTCEvaluate(V, bsdfData.normalWS, preLightData.ltcXformGGX, L, lightData.twoSided);
ltcValue *= lightData.specularScale;
specularLighting.rgb = fresnelTerm * lightData.color * ltcValue;
}
// TODO: current area light code doesn't take into account artist attenuation radius!
#endif

{
#ifdef LIT_DISPLAY_REFERENCE
specularLighting.rgb = IntegrateSpecularGGXIBLRef(lightLoopContext, V, lightData, bsdfData);
// TODO: fix 'IntegrateSpecularGGXIBLRef'.
// specularLighting.rgb = IntegrateSpecularGGXIBLRef(lightLoopContext, V, lightData, bsdfData);
specularLighting.rgb = float3(0.0, 0.0, 0.0);
specularLighting.a = 1.0;
/*

29
Assets/ScriptableRenderLoop/ShaderLibrary/AreaLighting.hlsl
查看文件


// Even though that replaced the switch with just some indexing and no branches, it became
// way, way slower - mem fetch stalls?
// clip
uint n = 0;
switch (config)
{

break;
}
if (n == 0)
return 0;
if (n == 3)
L[3] = L[0];
if (n == 4)
L4 = L[0];
if (n == 0) return 0;
L[3] = normalize(L[3]);
L4 = normalize(L4);
switch (n)
{
case 3:
L[3] = L[0];
break;
case 4:
L[3] = normalize(L[3]);
L4 = L[0];
break;
default: // 1, 2, 5
L[3] = normalize(L[3]);
L4 = normalize(L4);
break;
}
// 3. Integrate
float sum = 0;

if (n == 5)
sum += IntegrateEdge(L4, L[0]);
return twoSided > 0.0 ? abs(sum) : max(0.0, sum);
sum *= INV_TWO_PI; // Normalization of the integral of cosine over the sphere
return twoSided ? abs(sum) : max(sum, 0.0);
}
float LTCEvaluate(float3 V, float3 N, float3x3 minV, float4x3 L, bool twoSided)

688
Assets/TestScenes/HDTest/HDRenderLoopTest.unity
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