namespace UnityEngine.Experimental.Rendering { public class ShadowUtilsConstants { // Matches ScriptableShadowsUtility.cpp public enum CubemapEdge { kCubeEdgePX_PY = 0, kCubeEdgePX_NY, kCubeEdgePX_PZ, kCubeEdgePX_NZ, kCubeEdgeNX_PY, kCubeEdgeNX_NY, kCubeEdgeNX_PZ, kCubeEdgeNX_NZ, kCubeEdgePY_PZ, kCubeEdgePY_NZ, kCubeEdgeNY_PZ, kCubeEdgeNY_NZ, kCubeEdge_Count }; public static readonly CubemapEdge[,] kCubemapEdgesPerFace = new CubemapEdge[6,4] { { CubemapEdge.kCubeEdgePX_PY, CubemapEdge.kCubeEdgePX_NY, CubemapEdge.kCubeEdgePX_PZ, CubemapEdge.kCubeEdgePX_NZ }, // PX { CubemapEdge.kCubeEdgeNX_PY, CubemapEdge.kCubeEdgeNX_NY, CubemapEdge.kCubeEdgeNX_PZ, CubemapEdge.kCubeEdgeNX_NZ }, // NX { CubemapEdge.kCubeEdgePX_PY, CubemapEdge.kCubeEdgeNX_PY, CubemapEdge.kCubeEdgePY_PZ, CubemapEdge.kCubeEdgePY_NZ }, // PY { CubemapEdge.kCubeEdgePX_NY, CubemapEdge.kCubeEdgeNX_NY, CubemapEdge.kCubeEdgeNY_PZ, CubemapEdge.kCubeEdgeNY_NZ }, // NY { CubemapEdge.kCubeEdgePX_PZ, CubemapEdge.kCubeEdgeNX_PZ, CubemapEdge.kCubeEdgePY_PZ, CubemapEdge.kCubeEdgeNY_PZ }, // PZ { CubemapEdge.kCubeEdgePX_NZ, CubemapEdge.kCubeEdgeNX_NZ, CubemapEdge.kCubeEdgePY_NZ, CubemapEdge.kCubeEdgeNY_NZ } // NZ }; const float oneOverSqr2 = 0.70710678118654752440084436210485f; public static readonly Vector3[] kCubemapEdgeDirections = new Vector3[(int)CubemapEdge.kCubeEdge_Count] { new Vector3( oneOverSqr2, oneOverSqr2, 0 ), new Vector3( oneOverSqr2, -oneOverSqr2, 0 ), new Vector3( oneOverSqr2, 0, oneOverSqr2 ), new Vector3( oneOverSqr2, 0, -oneOverSqr2 ), new Vector3( -oneOverSqr2, oneOverSqr2, 0 ), new Vector3( -oneOverSqr2, -oneOverSqr2, 0 ), new Vector3( -oneOverSqr2, 0, oneOverSqr2 ), new Vector3( -oneOverSqr2, 0, -oneOverSqr2 ), new Vector3( 0, oneOverSqr2, oneOverSqr2 ), new Vector3( 0, oneOverSqr2, -oneOverSqr2 ), new Vector3( 0, -oneOverSqr2, oneOverSqr2 ), new Vector3( 0, -oneOverSqr2, -oneOverSqr2 ) }; // Cubemap faces with flipped z coordinate. // These matrices do NOT match what we have in Skybox.cpp. // The C++ runtime flips y as well and requires patching up // the culling state. Using these matrices keeps the winding // order, but may need some special treatment if rendering // into an actual cubemap. public static readonly Matrix4x4[] kCubemapFaces = new Matrix4x4[] { new Matrix4x4( // pos X new Vector4( 0.0f, 0.0f, -1.0f, 0.0f ), new Vector4( 0.0f, 1.0f, 0.0f, 0.0f ), new Vector4( -1.0f, 0.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 0.0f, 1.0f ) ), new Matrix4x4( // neg x new Vector4( 0.0f, 0.0f, 1.0f, 0.0f ), new Vector4( 0.0f, 1.0f, 0.0f, 0.0f ), new Vector4( 1.0f, 0.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 0.0f, 1.0f ) ), new Matrix4x4( // pos y new Vector4( 1.0f, 0.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, -1.0f, 0.0f ), new Vector4( 0.0f, -1.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 0.0f, 1.0f ) ), new Matrix4x4( // neg y new Vector4( 1.0f, 0.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 1.0f, 0.0f ), new Vector4( 0.0f, 1.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 0.0f, 1.0f ) ), new Matrix4x4( // pos z new Vector4( 1.0f, 0.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 1.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, -1.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 0.0f, 1.0f ) ), new Matrix4x4( // neg z new Vector4( -1.0f, 0.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 1.0f, 0.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 1.0f, 0.0f ), new Vector4( 0.0f, 0.0f, 0.0f, 1.0f ) ) }; } public class ShadowUtils { public static void InvertView( ref Matrix4x4 view, out Matrix4x4 invview ) { invview = Matrix4x4.zero; invview.m00 = view.m00; invview.m01 = view.m10; invview.m02 = view.m20; invview.m10 = view.m01; invview.m11 = view.m11; invview.m12 = view.m21; invview.m20 = view.m02; invview.m21 = view.m12; invview.m22 = view.m22; invview.m33 = 1.0f; invview.m03 = -(invview.m00 * view.m03 + invview.m01 * view.m13 + invview.m02 * view.m23); invview.m13 = -(invview.m10 * view.m03 + invview.m11 * view.m13 + invview.m12 * view.m23); invview.m23 = -(invview.m20 * view.m03 + invview.m21 * view.m13 + invview.m22 * view.m23); } public static void InvertOrthographic( ref Matrix4x4 proj, ref Matrix4x4 view, out Matrix4x4 vpinv ) { Matrix4x4 invview; InvertView( ref view, out invview ); Matrix4x4 invproj = Matrix4x4.zero; invproj.m00 = 1.0f / proj.m00; invproj.m11 = 1.0f / proj.m11; invproj.m22 = 1.0f / proj.m22; invproj.m33 = 1.0f; invproj.m03 = proj.m03 * invproj.m00; invproj.m13 = proj.m13 * invproj.m11; invproj.m23 = - proj.m23 * invproj.m22; vpinv = invview * invproj; } public static void InvertPerspective( ref Matrix4x4 proj, ref Matrix4x4 view, out Matrix4x4 vpinv ) { Matrix4x4 invview; InvertView(ref view, out invview); Matrix4x4 invproj = Matrix4x4.zero; invproj.m00 = 1.0f / proj.m00; invproj.m03 = proj.m02 * invproj.m00; invproj.m11 = 1.0f / proj.m11; invproj.m13 = proj.m12 * invproj.m11; invproj.m22 = 0.0f; invproj.m23 = -1.0f; invproj.m33 = proj.m22 / proj.m23; invproj.m32 = invproj.m33 / proj.m22; vpinv = invview * invproj; } public static Matrix4x4 ExtractSpotLightMatrix( VisibleLight vl, out Matrix4x4 view, out Matrix4x4 proj, out Matrix4x4 vpinverse, out Vector4 lightDir, out ShadowSplitData splitData ) { splitData = new ShadowSplitData(); splitData.cullingSphere.Set( 0.0f, 0.0f, 0.0f, float.NegativeInfinity ); splitData.cullingPlaneCount = 0; // get lightDir lightDir = vl.light.transform.forward; // calculate view Matrix4x4 scaleMatrix = Matrix4x4.identity; scaleMatrix.m22 = -1.0f; view = scaleMatrix * vl.localToWorld.inverse; // following code is from SharedLightData::GetNearPlaneMinBound float percentageBound = 0.01f * vl.light.range; float fixedBound = 0.1f; float nearmin = fixedBound <= percentageBound ? fixedBound : percentageBound; // calculate projection float zfar = vl.range; float znear = vl.light.shadowNearPlane >= nearmin ? vl.light.shadowNearPlane : nearmin; float fov = vl.spotAngle; proj = Matrix4x4.Perspective(fov, 1.0f, znear, zfar); // and the compound InvertPerspective( ref proj, ref view, out vpinverse ); return proj * view; } public static Matrix4x4 ExtractPointLightMatrix( VisibleLight vl, uint faceIdx, float fovBias, out Matrix4x4 view, out Matrix4x4 proj, out Matrix4x4 vpinverse, out Vector4 lightDir, out ShadowSplitData splitData ) { Debug.Assert( faceIdx <= (uint) CubemapFace.NegativeZ, "Tried to extract cubemap face " + faceIdx + "." ); splitData = new ShadowSplitData(); splitData.cullingSphere.Set( 0.0f, 0.0f, 0.0f, float.NegativeInfinity ); splitData.cullingPlaneCount = 4; // get lightDir lightDir = vl.light.transform.forward; // calculate the view matrices Vector3 lpos = vl.light.transform.position; view = ShadowUtilsConstants.kCubemapFaces[faceIdx]; Vector3 inverted_viewpos = ShadowUtilsConstants.kCubemapFaces[faceIdx].MultiplyPoint( -lpos ); view.SetColumn( 3, new Vector4( inverted_viewpos.x, inverted_viewpos.y, inverted_viewpos.z, 1.0f ) ); for( int i = 0; i < 4; ++i ) { ShadowUtilsConstants.CubemapEdge cubemapEdge = ShadowUtilsConstants.kCubemapEdgesPerFace[faceIdx,i]; Vector3 cullingPlaneDirection = ShadowUtilsConstants.kCubemapEdgeDirections[(int)cubemapEdge]; splitData.SetCullingPlane( i, new Plane( cullingPlaneDirection, lpos ) ); } // following code is from SharedLightData::GetNearPlaneMinBound float percentageBound = 0.01f * vl.light.range; float fixedBound = 0.1f; float nearmin = fixedBound <= percentageBound ? fixedBound : percentageBound; // calculate projection float farPlane = vl.range; float nearPlane = vl.light.shadowNearPlane >= nearmin ? vl.light.shadowNearPlane : nearmin; proj = Matrix4x4.Perspective( 90.0f + fovBias, 1.0f, nearPlane, farPlane ); // and the compound InvertPerspective( ref proj, ref view, out vpinverse ); return proj * view; } public static Matrix4x4 ExtractDirectionalLightMatrix( VisibleLight vl, uint cascadeIdx, int cascadeCount, float[] splitRatio, float nearPlaneOffset, uint width, uint height, out Matrix4x4 view, out Matrix4x4 proj, out Matrix4x4 vpinverse, out Vector4 lightDir, out ShadowSplitData splitData, CullResults cullResults, int lightIndex ) { Debug.Assert( width == height, "Currently the cascaded shadow mapping code requires square cascades." ); splitData = new ShadowSplitData(); splitData.cullingSphere.Set(0.0f, 0.0f, 0.0f, float.NegativeInfinity); splitData.cullingPlaneCount = 0; // get lightDir lightDir = vl.light.transform.forward; // TODO: At some point this logic should be moved to C#, then the parameters cullResults and lightIndex can be removed as well // For directional lights shadow data is extracted from the cullResults, so that needs to be somehow provided here. // Check ScriptableShadowsUtility.cpp ComputeDirectionalShadowMatricesAndCullingPrimitives(...) for details. Vector3 ratios = new Vector3(); for( int i = 0, cnt = splitRatio.Length < 3 ? splitRatio.Length : 3; i < cnt; i++ ) ratios[i] = splitRatio[i]; cullResults.ComputeDirectionalShadowMatricesAndCullingPrimitives( lightIndex, (int) cascadeIdx, cascadeCount, ratios, (int) width, nearPlaneOffset, out view, out proj, out splitData ); // and the compound InvertOrthographic( ref proj, ref view, out vpinverse ); return proj * view; } public static GPUShadowAlgorithm Pack( ShadowAlgorithm algo, ShadowVariant vari, ShadowPrecision prec ) { int precshift = ShadowConstants.Bits.k_ShadowVariant + ShadowConstants.Bits.k_ShadowAlgorithm; int algoshift = ShadowConstants.Bits.k_ShadowVariant; return (GPUShadowAlgorithm) ( (int) prec << precshift | ((int) algo << algoshift) | (int)vari); } public static ShadowAlgorithm ExtractAlgorithm( GPUShadowAlgorithm gpuAlgo ) { return (ShadowAlgorithm) ( ShadowConstants.Masks.k_ShadowAlgorithm & ((int)gpuAlgo >> ShadowConstants.Bits.k_ShadowVariant) ); } public static ShadowVariant ExtractVariant( GPUShadowAlgorithm gpuAlgo ) { return (ShadowVariant ) ( ShadowConstants.Masks.k_ShadowVariant & (int)gpuAlgo ); } public static ShadowPrecision ExtractPrecision( GPUShadowAlgorithm gpuAlgo ) { return (ShadowPrecision) ( ShadowConstants.Masks.k_ShadowPrecision & ((int)gpuAlgo >> (ShadowConstants.Bits.k_ShadowVariant + ShadowConstants.Bits.k_ShadowAlgorithm)) ); } public static void Unpack( GPUShadowAlgorithm gpuAlgo, out ShadowAlgorithm algo, out ShadowVariant vari, out ShadowPrecision prec ) { algo = ExtractAlgorithm( gpuAlgo ); vari = ExtractVariant( gpuAlgo ); prec = ExtractPrecision( gpuAlgo ); } public static GPUShadowAlgorithm ClearPrecision( GPUShadowAlgorithm gpuAlgo ) { var algo = ExtractAlgorithm( gpuAlgo ); var vari = ExtractVariant( gpuAlgo ); return Pack( algo, vari, ShadowPrecision.Low ); } public static float Asfloat( uint val ) { return System.BitConverter.ToSingle( System.BitConverter.GetBytes( val ), 0 ); } public static float Asfloat( int val ) { return System.BitConverter.ToSingle( System.BitConverter.GetBytes( val ), 0 ); } public static int Asint( float val ) { return System.BitConverter.ToInt32( System.BitConverter.GetBytes( val ), 0 ); } public static uint Asuint( float val ) { return System.BitConverter.ToUInt32( System.BitConverter.GetBytes( val ), 0 ); } } } // end of namespace UnityEngine.Experimental.ScriptableRenderLoop