Sebastien Lagarde
8 年前
当前提交
eed1a7a3
共有 8 个文件被更改，包括 542 次插入 和 128 次删除
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58Assets/ScriptableRenderLoop/fptl/FptlLighting.cs
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1Assets/ScriptableRenderLoop/fptl/LightDefinitions.cs
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5Assets/ScriptableRenderLoop/fptl/LightDefinitions.cs.hlsl
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77Assets/ScriptableRenderLoop/fptl/lightlistbuild-clustered.compute
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22Assets/ScriptableRenderLoop/fptl/lightlistbuild.compute
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60Assets/ScriptableRenderLoop/fptl/scrbound.compute
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102Assets/ScriptableRenderLoop/fptl/LightingConvexHullUtils.hlsl
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345Assets/ScriptableRenderLoop/fptl/lightlistbuild-bigtile.compute
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#ifndef __LIGHTINGCONVEXHULLUTILS_H__ |
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#define __LIGHTINGCONVEXHULLUTILS_H__ |
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#include "..\common\ShaderBase.h" |
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#include "LightDefinitions.cs.hlsl" |
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float3 GetHullVertex(const float3 boxX, const float3 boxY, const float3 boxZ, const float3 center, const float2 scaleXY, const int p) |
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{ |
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const bool bIsTopVertex = (p&4)!=0; |
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float3 vScales = float3( ((p&1)!=0 ? 1.0f : (-1.0f))*(bIsTopVertex ? scaleXY.x : 1.0), ((p&2)!=0 ? 1.0f : (-1.0f))*(bIsTopVertex ? scaleXY.y : 1.0), (p&4)!=0 ? 1.0f : (-1.0f) ); |
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return (vScales.x*boxX + vScales.y*boxY + vScales.z*boxZ) + center; |
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} |
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void GetHullEdge(out int idx0, out int idx_twin, out float3 vP0, out float3 vE0, const int e0, const float3 boxX, const float3 boxY, const float3 boxZ, const float3 center, const float2 scaleXY) |
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{ |
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int iAxis = e0>>2; |
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int iSwizzle = e0&0x3; |
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bool bIsSwizzleOneOrTwo = ((iSwizzle-1)&0x2)==0; |
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const int i0 = iAxis==0 ? (2*iSwizzle+0) : ( iAxis==1 ? (iSwizzle+(iSwizzle&2)) : iSwizzle); |
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const int i1 = i0 + (1<<iAxis); |
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const bool bSwap = iAxis==0 ? (!bIsSwizzleOneOrTwo) : (iAxis==1 ? false : bIsSwizzleOneOrTwo); |
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idx0 = bSwap ? i1 : i0; |
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idx_twin = bSwap ? i0 : i1; |
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float3 p0 = GetHullVertex(boxX, boxY, boxZ, center, scaleXY, idx0); |
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float3 p1 = GetHullVertex(boxX, boxY, boxZ, center, scaleXY, idx_twin); |
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vP0 = p0; |
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vE0 = p1-p0; |
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} |
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void GetQuad(out float3 p0, out float3 p1, out float3 p2, out float3 p3, const float3 boxX, const float3 boxY, const float3 boxZ, const float3 center, const float2 scaleXY, const int sideIndex) |
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{ |
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//const int iAbsSide = (sideIndex == 0 || sideIndex == 1) ? 0 : ((sideIndex == 2 || sideIndex == 3) ? 1 : 2); |
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const int iAbsSide = min(sideIndex>>1, 2); |
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const float fS = (sideIndex & 1) != 0 ? 1 : (-1); |
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float3 vA = fS*(iAbsSide == 0 ? boxX : (iAbsSide == 1 ? (-boxY) : boxZ)); |
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float3 vB = fS*(iAbsSide == 0 ? (-boxY) : (iAbsSide == 1 ? (-boxX) : (-boxY))); |
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float3 vC = iAbsSide == 0 ? boxZ : (iAbsSide == 1 ? boxZ : (-boxX)); |
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bool bIsTopQuad = iAbsSide == 2 && (sideIndex & 1) != 0; // in this case all 4 verts get scaled. |
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bool bIsSideQuad = (iAbsSide == 0 || iAbsSide == 1); // if side quad only two verts get scaled (impacts q1 and q2) |
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if (bIsTopQuad) { vB *= scaleXY.y; vC *= scaleXY.x; } |
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float3 vA2 = vA; |
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float3 vB2 = vB; |
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if (bIsSideQuad) { vA2 *= (iAbsSide == 0 ? scaleXY.x : scaleXY.y); vB2 *= (iAbsSide == 0 ? scaleXY.y : scaleXY.x); } |
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// delivered counterclockwise in right hand space and clockwise in left hand space |
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p0 = center + (vA + vB - vC); // center + vA is center of face when scaleXY is 1.0 |
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p1 = center + (vA - vB - vC); |
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p2 = center + (vA2 - vB2 + vC); |
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p3 = center + (vA2 + vB2 + vC); |
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} |
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void GetPlane(out float3 p0, out float3 vN, const float3 boxX, const float3 boxY, const float3 boxZ, const float3 center, const float2 scaleXY, const int sideIndex) |
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{ |
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//const int iAbsSide = (sideIndex == 0 || sideIndex == 1) ? 0 : ((sideIndex == 2 || sideIndex == 3) ? 1 : 2); |
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const int iAbsSide = min(sideIndex>>1, 2); |
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const float fS = (sideIndex & 1) != 0 ? 1 : (-1); |
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float3 vA = fS*(iAbsSide == 0 ? boxX : (iAbsSide == 1 ? (-boxY) : boxZ)); |
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float3 vB = fS*(iAbsSide == 0 ? (-boxY) : (iAbsSide == 1 ? (-boxX) : (-boxY))); |
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float3 vC = iAbsSide == 0 ? boxZ : (iAbsSide == 1 ? boxZ : (-boxX)); |
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bool bIsTopQuad = iAbsSide == 2 && (sideIndex & 1) != 0; // in this case all 4 verts get scaled. |
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bool bIsSideQuad = (iAbsSide == 0 || iAbsSide == 1); // if side quad only two verts get scaled (impacts q1 and q2) |
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if (bIsTopQuad) { vB *= scaleXY.y; vC *= scaleXY.x; } |
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float3 vA2 = vA; |
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float3 vB2 = vB; |
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if (bIsSideQuad) { vA2 *= (iAbsSide == 0 ? scaleXY.x : scaleXY.y); vB2 *= (iAbsSide == 0 ? scaleXY.y : scaleXY.x); } |
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p0 = center + (vA + vB - vC); // center + vA is center of face when scaleXY is 1.0 |
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float3 vNout = cross( vB2, 0.5*(vA-vA2) - vC ); |
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#ifdef LEFT_HAND_COORDINATES |
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vNout = -vNout; |
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#endif |
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vN = vNout; |
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} |
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float4 GetPlaneEq(const float3 boxX, const float3 boxY, const float3 boxZ, const float3 center, const float2 scaleXY, const int sideIndex) |
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{ |
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float3 p0, vN; |
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GetPlane(p0, vN, boxX, boxY, boxZ, center, scaleXY, sideIndex); |
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return float4(vN, -dot(vN,p0)); |
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} |
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#endif |
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#pragma kernel BigTileLightListGen |
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#include "..\common\ShaderBase.h" |
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#include "LightDefinitions.cs.hlsl" |
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#include "LightingConvexHullUtils.hlsl" |
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#define EXACT_EDGE_TESTS |
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#define PERFORM_SPHERICAL_INTERSECTION_TESTS |
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#define MAX_NR_BIGTILE_LIGHTS (MAX_NR_BIGTILE_LIGHTS_PLUSONE-1) |
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uniform int g_iNrVisibLights; |
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uniform uint2 g_viDimensions; |
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uniform float4x4 g_mInvScrProjection; |
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uniform float4x4 g_mScrProjection; |
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uniform float g_fNearPlane; |
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uniform float g_fFarPlane; |
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StructuredBuffer<float3> g_vBoundsBuffer : register( t1 ); |
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StructuredBuffer<SFiniteLightData> g_vLightData : register( t2 ); |
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StructuredBuffer<SFiniteLightBound> g_data : register( t3 ); |
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#define NR_THREADS 64 |
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// output buffer |
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RWStructuredBuffer<uint> g_vLightList : register( u0 ); |
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// 2kB (room for roughly 30 wavefronts) |
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groupshared unsigned int lightsListLDS[MAX_NR_BIGTILE_LIGHTS_PLUSONE]; |
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groupshared uint lightOffs; |
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float GetLinearDepth(float zDptBufSpace) // 0 is near 1 is far |
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{ |
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float3 vP = float3(0.0f,0.0f,zDptBufSpace); |
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float4 v4Pres = mul(g_mInvScrProjection, float4(vP,1.0)); |
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return v4Pres.z / v4Pres.w; |
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} |
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float3 GetViewPosFromLinDepth(float2 v2ScrPos, float fLinDepth) |
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{ |
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float fSx = g_mScrProjection[0].x; |
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float fCx = g_mScrProjection[0].z; |
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float fSy = g_mScrProjection[1].y; |
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float fCy = g_mScrProjection[1].z; |
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#ifdef LEFT_HAND_COORDINATES |
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return fLinDepth*float3( ((v2ScrPos.x-fCx)/fSx), ((v2ScrPos.y-fCy)/fSy), 1.0 ); |
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#else |
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return fLinDepth*float3( -((v2ScrPos.x+fCx)/fSx), -((v2ScrPos.y+fCy)/fSy), 1.0 ); |
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#endif |
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} |
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float GetOnePixDiagWorldDistAtDepthOne() |
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{ |
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float fSx = g_mScrProjection[0].x; |
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float fSy = g_mScrProjection[1].y; |
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return length( float2(1.0/fSx,1.0/fSy) ); |
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} |
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void sortLightList(int localThreadID, int n); |
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#ifdef PERFORM_SPHERICAL_INTERSECTION_TESTS |
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void SphericalIntersectionTests(uint threadID, int iNrCoarseLights, float2 screenCoordinate); |
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#endif |
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#ifdef EXACT_EDGE_TESTS |
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void CullByExactEdgeTests(uint threadID, int iNrCoarseLights, uint2 viTilLL, uint2 viTilUR); |
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#endif |
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[numthreads(NR_THREADS, 1, 1)] |
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void BigTileLightListGen(uint threadID : SV_GroupIndex, uint3 u3GroupID : SV_GroupID) |
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{ |
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uint2 tileIDX = u3GroupID.xy; |
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uint t=threadID; |
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uint iWidth = g_viDimensions.x; |
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uint iHeight = g_viDimensions.y; |
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uint nrBigTilesX = (iWidth+63)/64; |
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uint nrBigTilesY = (iHeight+63)/64; |
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if(t==0) lightOffs = 0; |
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#if !defined(XBONE) && !defined(PLAYSTATION4) |
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GroupMemoryBarrierWithGroupSync(); |
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#endif |
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uint2 viTilLL = 64*tileIDX; |
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uint2 viTilUR = min( viTilLL+uint2(64,64), uint2(iWidth, iHeight) ); // not width and height minus 1 since viTilUR represents the end of the tile corner. |
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float2 vTileLL = float2(viTilLL.x/(float) iWidth, viTilLL.y/(float) iHeight); |
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float2 vTileUR = float2(viTilUR.x/(float) iWidth, viTilUR.y/(float) iHeight); |
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// build coarse list using AABB |
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for(int l=(int) t; l<(int) g_iNrVisibLights; l += NR_THREADS) |
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{ |
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const float2 vMi = g_vBoundsBuffer[l].xy; |
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const float2 vMa = g_vBoundsBuffer[l+g_iNrVisibLights].xy; |
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if( all(vMa>vTileLL) && all(vMi<vTileUR)) |
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{ |
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unsigned int uInc = 1; |
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unsigned int uIndex; |
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InterlockedAdd(lightOffs, uInc, uIndex); |
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if(uIndex<MAX_NR_BIGTILE_LIGHTS) lightsListLDS[uIndex] = l; // add to light list |
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} |
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} |
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#if !defined(XBONE) && !defined(PLAYSTATION4) |
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GroupMemoryBarrierWithGroupSync(); |
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#endif |
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int iNrCoarseLights = lightOffs<MAX_NR_BIGTILE_LIGHTS ? lightOffs : MAX_NR_BIGTILE_LIGHTS; |
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#ifdef PERFORM_SPHERICAL_INTERSECTION_TESTS |
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SphericalIntersectionTests( t, iNrCoarseLights, float2(min(viTilLL.xy+uint2(64/2,64/2), uint2(iWidth-1, iHeight-1))) ); |
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#endif |
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#ifdef EXACT_EDGE_TESTS |
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CullByExactEdgeTests(t, iNrCoarseLights, viTilLL.xy, viTilUR.xy); |
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#endif |
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// sort lights |
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sortLightList((int) t, iNrCoarseLights); // sorting on GCN as well for now since we need the culled lights weeded out. |
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lightOffs = 0; |
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GroupMemoryBarrierWithGroupSync(); |
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for(int i=t; i<iNrCoarseLights; i+=NR_THREADS) if(lightsListLDS[i]<g_iNrVisibLights) InterlockedAdd(lightOffs, 1); |
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GroupMemoryBarrierWithGroupSync(); |
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iNrCoarseLights = lightOffs; |
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int offs = tileIDX.y*nrBigTilesX + tileIDX.x; |
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for(int i=t; i<(iNrCoarseLights+1); i+=NR_THREADS) |
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g_vLightList[MAX_NR_BIGTILE_LIGHTS_PLUSONE*offs + i] = t==0 ? iNrCoarseLights : lightsListLDS[i-1]; |
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} |
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// NOTE! returns 1 when value_in==0 |
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unsigned int LimitPow2AndClamp(unsigned int value_in, unsigned int maxValue) |
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{ |
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unsigned int value = 1; |
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while(value<value_in && (value<<1)<=maxValue) |
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value<<=1; |
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return value; |
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} |
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void sortLightList(int localThreadID, int length) |
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{ |
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// closest pow2 integer greater than or equal to length |
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const int N = (const int) LimitPow2AndClamp((unsigned int) length, MAX_NR_BIGTILE_LIGHTS_PLUSONE); // N is 1 when length is zero but will still not enter first for-loop |
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// bitonic sort can only handle arrays with a power of two length. Fill remaining entries with greater than possible index. |
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for(int t=length+localThreadID; t<N; t+=NR_THREADS) { lightsListLDS[t]=0xffffffff; } // impossible index |
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GroupMemoryBarrierWithGroupSync(); |
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for(int k=2; k<=N; k=2*k) |
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{ |
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for(int j=k>>1; j>0; j=j>>1) |
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{ |
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for(int i=localThreadID; i<N; i+=NR_THREADS) |
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{ |
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int ixj=i^j; |
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if((ixj)>i) |
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{ |
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const unsigned int Avalue = lightsListLDS[i]; |
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const unsigned int Bvalue = lightsListLDS[ixj]; |
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const bool mustSwap = ((i&k)!=0^(Avalue>Bvalue)) && Avalue!=Bvalue; |
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if(mustSwap) |
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{ |
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lightsListLDS[i]=Bvalue; |
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lightsListLDS[ixj]=Avalue; |
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} |
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} |
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} |
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GroupMemoryBarrierWithGroupSync(); |
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} |
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} |
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} |
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#ifdef PERFORM_SPHERICAL_INTERSECTION_TESTS |
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void SphericalIntersectionTests(uint threadID, int iNrCoarseLights, float2 screenCoordinate) |
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{ |
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#ifdef LEFT_HAND_COORDINATES |
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float3 V = GetViewPosFromLinDepth( screenCoordinate, 1.0); |
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#else |
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float3 V = GetViewPosFromLinDepth( screenCoordinate, -1.0); |
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#endif |
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float onePixDiagDist = GetOnePixDiagWorldDistAtDepthOne(); |
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float worldDistAtDepthOne = 32*onePixDiagDist; // scale by half a tile |
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int iNrVisib = 0; |
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for(int l=threadID; l<iNrCoarseLights; l+=NR_THREADS) |
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{ |
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SFiniteLightBound lgtDat = g_data[lightsListLDS[l]]; |
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const float3 center = lgtDat.center.xyz; |
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float fRad = lgtDat.radius; |
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#if 1 |
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float3 maxZdir = float3(-center.z*center.x, -center.z*center.y, center.x*center.x + center.y*center.y); // cross(center,cross(Zaxis,center)) |
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float len = length(maxZdir); |
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float scalarProj = len>0.0001 ? (maxZdir.z/len) : len; // since len>=(maxZdir.z/len) we can use len as an approximate value when len<=epsilon |
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float fOffs = scalarProj*fRad; |
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#else |
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float fOffs = fRad; // more false positives due to larger radius but works too |
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#endif |
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#ifdef LEFT_HAND_COORDINATES |
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fRad = fRad + (center.z+fOffs)*worldDistAtDepthOne; |
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#else |
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fRad = fRad - (center.z-fOffs)*worldDistAtDepthOne; |
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#endif |
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float a = dot(V,V); |
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float CdotV = dot(center,V); |
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float c = dot(center,center) - fRad*fRad; |
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float fDescDivFour = CdotV*CdotV - a*c; |
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if(!(c<0 || (fDescDivFour>0 && CdotV>0))) // if ray misses bounding sphere |
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lightsListLDS[l]=0xffffffff; |
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} |
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#if !defined(XBONE) && !defined(PLAYSTATION4) |
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GroupMemoryBarrierWithGroupSync(); |
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#endif |
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} |
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#endif |
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#ifdef EXACT_EDGE_TESTS |
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float3 GetTileVertex(uint2 viTilLL, uint2 viTilUR, int i, float fTileFarPlane) |
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{ |
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float x = (i&1)==0 ? viTilLL.x : viTilUR.x; |
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float y = (i&2)==0 ? viTilLL.y : viTilUR.y; |
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float z = (i&4)==0 ? g_fNearPlane : fTileFarPlane; |
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#ifndef LEFT_HAND_COORDINATES |
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z = -z; |
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#endif |
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return GetViewPosFromLinDepth( float2(x, y), z); |
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} |
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void GetFrustEdge(out float3 vP0, out float3 vE0, const int e0, uint2 viTilLL, uint2 viTilUR, float fTileFarPlane) |
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{ |
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int iSection = e0>>2; // section 0 is side edges, section 1 is near edges and section 2 is far edges |
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int iSwizzle = e0&0x3; |
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int i=iSwizzle + (2*(iSection&0x2)); // offset by 4 at section 2 |
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vP0 = GetTileVertex(uint2(viTilLL.x, viTilUR.y), uint2(viTilUR.x, viTilLL.y), i, fTileFarPlane); |
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vE0 = iSection==0 ? vP0 : (((iSwizzle&0x2)==0 ? 1.0f : (-1.0f))*((iSwizzle&0x1)==(iSwizzle>>1) ? float3(1,0,0) : float3(0,1,0))); |
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} |
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void CullByExactEdgeTests(uint threadID, int iNrCoarseLights, uint2 viTilLL, uint2 viTilUR) |
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{ |
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const bool bOnlyNeedFrustumSideEdges = true; |
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const int nrFrustEdges = bOnlyNeedFrustumSideEdges ? 4 : 8; // max 8 since we never need to test 4 far edges of frustum since they are identical vectors to near edges and plane is placed at vP0 on light hull. |
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const int totNrEdgePairs = 12*nrFrustEdges; |
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for(int l=0; l<iNrCoarseLights; l++) |
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{ |
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const int idxCoarse = lightsListLDS[l]; |
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[branch]if(idxCoarse<(uint) g_iNrVisibLights && g_vLightData[idxCoarse].lightType!=SPHERE_LIGHT) // don't bother doing edge tests for sphere lights since these have camera aligned bboxes. |
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{ |
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SFiniteLightBound lgtDat = g_data[idxCoarse]; |
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const float3 boxX = lgtDat.boxAxisX.xyz; |
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const float3 boxY = lgtDat.boxAxisY.xyz; |
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const float3 boxZ = -lgtDat.boxAxisZ.xyz; // flip an axis to make it right handed since Determinant(worldToView)<0 |
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const float3 center = lgtDat.center.xyz; |
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const float2 scaleXY = lgtDat.scaleXY; |
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for(int i=threadID; i<totNrEdgePairs; i+=NR_THREADS) |
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{ |
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int e0 = (int) (((uint)i)/((uint) nrFrustEdges)); // should become a shift right |
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int e1 = i - e0*nrFrustEdges; |
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int idx_cur=0, idx_twin=0; |
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float3 vP0, vE0; |
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GetHullEdge(idx_cur, idx_twin, vP0, vE0, e0, boxX, boxY, boxZ, center, scaleXY); |
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float3 vP1, vE1; |
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GetFrustEdge(vP1, vE1, e1, viTilLL, viTilUR, g_fFarPlane); |
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|
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// potential separation plane |
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float3 vN = cross(vE0, vE1); |
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|
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int positive=0, negative=0; |
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for(int k=1; k<8; k++) // only need to test 7 verts (technically just 6). |
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{ |
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int j = (idx_cur+k)&0x7; |
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float3 vPh = GetHullVertex(boxX, boxY, boxZ, center, scaleXY, j); |
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float fSignDist = idx_twin==j ? 0.0 : dot(vN, vPh-vP0); |
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if(fSignDist>0) ++positive; else if(fSignDist<0) ++negative; |
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} |
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int resh = (positive>0 && negative>0) ? 0 : (positive>0 ? 1 : (negative>0 ? (-1) : 0)); |
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|
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positive=0; negative=0; |
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for(int j=0; j<8; j++) |
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{ |
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float3 vPf = GetTileVertex(viTilLL, viTilUR, j, g_fFarPlane); |
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float fSignDist = dot(vN, vPf-vP0); |
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if(fSignDist>0) ++positive; else if(fSignDist<0) ++negative; |
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} |
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int resf = (positive>0 && negative>0) ? 0 : (positive>0 ? 1 : (negative>0 ? (-1) : 0)); |
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|
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bool bFoundSepPlane = (resh*resf)<0; |
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if(bFoundSepPlane) lightsListLDS[l]=0xffffffff; |
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} |
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} |
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} |
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#if !defined(XBONE) && !defined(PLAYSTATION4) |
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GroupMemoryBarrierWithGroupSync(); |
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#endif |
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} |
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#endif |
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