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Merge pull request #809 from Unity-Technologies/Branch_ScreenSpaceShadows
Merge pull request #809 from Unity-Technologies/Branch_ScreenSpaceShadows
Contact Shadows/main
GitHub
7 年前
当前提交
5c7e1fd0
共有 13 个文件被更改，包括 317 次插入 和 34 次删除
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99SampleScenes/HDTest/ShadowsTest.unity
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4ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Random.hlsl
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12ScriptableRenderPipeline/Core/CoreRP/Shadow/AdditionalShadowData.cs
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7ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Lighting/HDLightEditor.Styles.cs
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33ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/Lighting/HDLightEditor.cs
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1ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/RenderLoopSettings/FrameSettingsUI.cs
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2ScriptableRenderPipeline/HDRenderPipeline/HDRP/Editor/RenderLoopSettings/SerializedFrameSettings.cs
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8ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDRenderPipelineAsset.asset
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3ScriptableRenderPipeline/HDRenderPipeline/HDRP/HDStringConstants.cs
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122ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/DeferredDirectionalShadow.compute
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30ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/LightLoop.cs
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7ScriptableRenderPipeline/HDRenderPipeline/HDRP/RenderPipeline/FrameSettings.cs
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23ScriptableRenderPipeline/HDRenderPipeline/HDRP/ShaderVariablesFunctions.hlsl
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// Each #kernel tells which function to compile; you can have many kernels |
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#pragma kernel DeferredDirectionalShadow |
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#pragma kernel DeferredDirectionalShadow DEFERRED_DIRECTIONAL=DeferredDirectionalShadow |
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#pragma kernel DeferredDirectionalShadow_Contact DEFERRED_DIRECTIONAL=DeferredDirectionalShadow_Contact ENABLE_CONTACT_SHADOWS |
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//#pragma enable_d3d11_debug_symbols |
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float _DirectionalShadowIndex; |
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CBUFFER_START(DeferredShadowParameters) |
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float _DirectionalShadowIndex; |
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float3 _LightDirection; |
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float4 _ScreenSpaceShadowsParameters; |
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uint _SampleCount; |
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CBUFFER_END |
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#define _ContactShadowLength _ScreenSpaceShadowsParameters.x |
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#define _ContactShadowDistanceScaleFactor _ScreenSpaceShadowsParameters.y |
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#define _ContactShadowFadeEnd _ScreenSpaceShadowsParameters.z |
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#define _ContactShadowFadeOneOverRange _ScreenSpaceShadowsParameters.w |
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// Return 1.0 if occluded 0.0 if not |
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float4 ScreenSpaceShadowRayCast(float3 positionWS, float3 rayDirection, float rayLength) |
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{ |
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uint3 hashInput = uint3(abs(GetAbsolutePositionWS(positionWS)) * 1000); |
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// Dither pattern is shifted by 0.5 because we want to jitter the ray starting position backward and forward (so we need values between -0.5 and 0.5) |
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float ditherBias = 0.5; |
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float dither = GenerateHashedRandomFloat(hashInput) - ditherBias; |
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float3 rayStartWS = positionWS; |
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float3 rayEndWS = rayStartWS + rayDirection * rayLength; |
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float4 rayStartCS = TransformWorldToHClip(rayStartWS); |
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float4 rayEndCS = TransformWorldToHClip(rayEndWS); |
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// Here we compute a ray perpendicular to view space. This is the ray we use to compute the threshold for rejecting samples. |
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// This is done this way so that the threshold is less dependent of ray slope. |
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float4 rayOrthoViewSpace = rayStartCS + mul(GetViewToHClipMatrix(), float4(0, 0, rayLength, 0)); |
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rayOrthoViewSpace = rayOrthoViewSpace / rayOrthoViewSpace.w; |
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rayStartCS.xyz = rayStartCS.xyz / rayStartCS.w; |
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rayEndCS.xyz = rayEndCS.xyz / rayEndCS.w; |
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// Pixel to light ray in clip space. |
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float3 rayCS = rayEndCS.xyz - rayStartCS.xyz; |
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// Depth at the start of the ray |
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float startDepth = rayStartCS.z; |
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// Depth range of the ray |
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float rayDepth = rayCS.z; |
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// Starting UV of the sampling loop |
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float2 startUV = rayStartCS.xy * 0.5f + 0.5f; |
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startUV.y = 1.0 - startUV.y; |
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// Pixel to light ray in |
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float2 rayUV = rayCS.xy * 0.5f; |
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rayUV.y = -rayUV.y; |
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float step = 1.0 / _SampleCount; |
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float compareThreshold = abs(rayOrthoViewSpace.z - rayStartCS.z) * step; |
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float occluded = 0.0f; |
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for (int i = 0; i < _SampleCount; i++) |
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{ |
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// Step for this sample |
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float sampleStep = ((i + 1) * step + step * dither); |
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// UVs for the current sample |
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float2 sampleUV = startUV + rayUV * sampleStep; |
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// Ray depth for this sample |
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float raySampleDepth = startDepth + rayDepth * sampleStep; |
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// Depth buffer depth for this sample |
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float sampleDepth = SAMPLE_TEXTURE2D_LOD(_MainDepthTexture, sampler_MainDepthTexture, sampleUV, 0.0).x; |
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bool Hit = false; |
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float depthDiff = sampleDepth - raySampleDepth; |
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Hit = depthDiff < compareThreshold && depthDiff > 0.0;// 1e-4; |
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if (Hit) |
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occluded = 1.0f; |
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} |
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// Off screen masking |
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// We remove the occlusion if the ray is occluded and only if direction steps out of the screen |
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float2 vignette = max(6.0 * abs(rayStartCS.xy + rayCS.xy * occluded * 0.5) - 5.0, 0.0); |
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occluded *= saturate( 1.0 - dot(vignette, vignette) ); |
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return occluded; |
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} |
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void DeferredDirectionalShadow(uint2 groupThreadId : SV_GroupThreadID, uint2 groupId : SV_GroupID) |
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void DEFERRED_DIRECTIONAL(uint2 groupThreadId : SV_GroupThreadID, uint2 groupId : SV_GroupID) |
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uint2 pixelCoord = groupId * DEFERRED_SHADOW_TILE_SIZE + groupThreadId; |
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uint2 tileCoord = groupId; |
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uint2 pixelCoord = groupId * DEFERRED_SHADOW_TILE_SIZE + groupThreadId; |
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uint2 tileCoord = groupId; |
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PositionInputs posInput = GetPositionInput(pixelCoord.xy, _ScreenSize.zw, tileCoord); |
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PositionInputs posInput = GetPositionInput(pixelCoord.xy, _ScreenSize.zw, tileCoord); |
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float depth = LOAD_TEXTURE2D(_MainDepthTexture, posInput.positionSS).x; |
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UpdatePositionInput(depth, UNITY_MATRIX_I_VP, UNITY_MATRIX_VP, posInput); |
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float depth = LOAD_TEXTURE2D(_MainDepthTexture, posInput.positionSS).x; |
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ShadowContext shadowContext = InitShadowContext(); |
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float shadow = GetDirectionalShadowAttenuation(shadowContext, posInput.positionWS, float3(0.0, 0.0, 0.0), (uint)_DirectionalShadowIndex, float3(0.0, 0.0, 0.0)); |
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if (depth == UNITY_RAW_FAR_CLIP_VALUE) |
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return; |
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_DeferredShadowTextureUAV[pixelCoord] = float4(shadow.xxx, 0.0); |
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UpdatePositionInput(depth, UNITY_MATRIX_I_VP, UNITY_MATRIX_VP, posInput); |
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ShadowContext shadowContext = InitShadowContext(); |
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float shadow = GetDirectionalShadowAttenuation(shadowContext, posInput.positionWS, float3(0.0, 0.0, 0.0), (uint)_DirectionalShadowIndex, float3(0.0, 0.0, 0.0)); |
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#ifdef ENABLE_CONTACT_SHADOWS |
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float contactShadow = 1.0f; |
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if (_ContactShadowLength > 0.0f) |
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{ |
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float4 result = ScreenSpaceShadowRayCast(posInput.positionWS, normalize(_LightDirection), _ContactShadowLength * max(0.5, posInput.linearDepth * _ContactShadowDistanceScaleFactor)); |
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contactShadow = 1.0 - result.x * saturate((_ContactShadowFadeEnd - posInput.linearDepth) * _ContactShadowFadeOneOverRange); |
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shadow *= contactShadow; |
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} |
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#endif |
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_DeferredShadowTextureUAV[pixelCoord] = float4(shadow, 0.0, 0.0, 0.0); |
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} |
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