260 lines
9.2 KiB
HLSL
260 lines
9.2 KiB
HLSL
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#ifndef EDGE_FUSION_BLEND_LIB_INCLUDED
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#define EDGE_FUSION_BLEND_LIB_INCLUDED
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static const float2 sunflower_points[32] = {
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float2(-0.08756255f, 0.08021447f),
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float2(0.01468209f, -0.16729483f),
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float2(0.12514433f, 0.16322862f),
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float2(-0.23386945f, -0.04136821f),
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float2(0.22404494f, -0.14251905f),
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float2(-0.07551290f, 0.28090421f),
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float2(-0.14480914f, -0.27882118f),
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float2(0.31549522f, 0.11521835f),
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float2(-0.32929810f, 0.13592947f),
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float2(0.15916285f, -0.34012176f),
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float2(0.11787271f, 0.37579677f),
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float2(-0.35591507f, -0.20626006f),
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float2(0.41817273f, -0.09193410f),
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float2(-0.25554255f, 0.36348298f),
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float2(-0.05910422f, -0.45610320f),
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float2(0.36320827f, 0.30611232f),
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float2(-0.48920069f, 0.02022998f),
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float2(0.35711789f, -0.35537999f),
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float2(-0.02390958f, 0.51706675f),
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float2(-0.34025894f, -0.40774392f),
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float2(0.53932101f, 0.07256488f),
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float2(-0.45720732f, 0.31811294f),
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float2(0.12499574f, -0.55561858f),
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float2(0.28923687f, 0.50475690f),
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float2(-0.56566134f, -0.18046139f),
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float2(0.54967531f, -0.25396393f),
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float2(-0.23821633f, 0.56920574f),
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float2(-0.21267188f, -0.59128201f),
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float2(0.56606831f, 0.29750964f),
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float2(-0.62893715f, 0.16578581f),
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float2(0.35758678f, -0.55612960f),
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float2(0.11377869f, 0.66204563f)
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};
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inline float2 GetOffset(int index) {
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return sunflower_points[index];
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}
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float _JitterFrame;
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#define dot2(x) dot(x, x)
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float3 HashToColor(float x) {
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float3 v = frac(sin(float3(x, x * 1.37, x * 2.17)) * 4378.5453);
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return saturate(v);
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}
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float GetLuma(float3 rgb) {
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//const float3 lum = float3(0.2627, 0.6780, 0.0593); // Rec.2020 (HDR/wide gamut)
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//const float3 lum = float3(0.2126, 0.7152, 0.0722); // Rec709 (sRGB/HD)
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const float3 lum = float3(0.299, 0.587, 0.114); // Rec601 (SD/broadcast)
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return dot(rgb, lum);
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}
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float3 ColorLerp(float3 a, float3 b, float t) {
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#if UNITY_COLORSPACE_GAMMA
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a = SRGBToLinear(a);
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b = SRGBToLinear(b);
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#endif
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float3 c = lerp(a, b, t);
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#if UNITY_COLORSPACE_GAMMA
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c = LinearToSRGB(c);
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#endif
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return c;
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}
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float FindEdgeNeighbour(float2 uvA, out float2 neighbourUV) {
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neighbourUV = uvA;
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float4 oidA = SampleObjectData(uvA);
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if (abs(oidA.r) < 1e-6) return 0.0;
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float4 oidEdge = oidA;
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float2 edgeUV = uvA;
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float linearDepthA = LinearEyeDepth(oidA.y, _ZBufferParams);
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float compensatedDefaultRadius = _DefaultRadiusWorld * (1.0 + _DistanceCompensation * linearDepthA);
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float maxRadiusWorldSqr = compensatedDefaultRadius * compensatedDefaultRadius;
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float bestDistSqr = maxRadiusWorldSqr;
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#if EDGE_FUSION_ANTI_FLICKER
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float sumSoftW = 0.0;
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float2 accumEdgeUV = float2(0.0, 0.0);
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float3 accumEdgeWpos = float3(0.0, 0.0, 0.0);
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#endif
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float3 wposA = GetWorldPos(uvA, oidA.y);
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float3 edgeWpos = wposA;
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#if EDGE_FUSION_INTRA_OBJECT || EDGE_FUSION_CONCAVE_ONLY
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float3 normalA = GetNormal(oidA);
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bool edgeCanUseSameIds = normalA.x < 100.0;
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#endif
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float uvRadiusBase = GetRadiusUV(oidA, linearDepthA);
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float radiusLimit = MAX_SCREEN_RADIUS;
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float uvRadiusEff = (radiusLimit * uvRadiusBase) / (uvRadiusBase + radiusLimit + 1e-6);
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float aspectRatio = _SrcColorTexture_TexelSize.y / _SrcColorTexture_TexelSize.x;
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float2 uvRadiusSearch = float2(uvRadiusBase, uvRadiusBase * aspectRatio);
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#if EDGE_FUSION_ENABLE_JITTER
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float ca, sa;
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float2 pixel = uvA * _ScreenParams.xy;
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float jitter = InterleavedGradientNoise(pixel, _JitterFrame);
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float angle = jitter * 2.0 * 3.1415927;
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sincos(angle, sa, ca);
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float2 axisX = float2(ca, sa) * uvRadiusSearch;
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float2 axisY = float2(-sa, ca) * uvRadiusSearch;
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#endif
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float edgeFactor = 0.0;
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for (int d = 0; d < _SampleCount; d++) {
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float2 offset;
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float2 pdir = GetOffset(d);
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#if EDGE_FUSION_ENABLE_JITTER
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offset = axisX * pdir.x + axisY * pdir.y;
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#else
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offset = pdir * uvRadiusSearch;
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#endif
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float2 uvB = uvA + offset;
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if (uvB.x < 0.0 || uvB.x > 1.0 || uvB.y < 0.0 || uvB.y > 1.0) continue;
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float4 oidB = SampleObjectData(uvB);
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if (abs(oidB.r) < 1e-6) continue;
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// Check if it's a different valid object
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bool isSameObject = SameObjectIds(oidB, oidA);
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// If intra-object fusion is enabled, check for edges within the same object
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#if EDGE_FUSION_INTRA_OBJECT || EDGE_FUSION_CONCAVE_ONLY
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bool sameIds = isSameObject && edgeCanUseSameIds;
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if (sameIds) {
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float3 normalB = GetNormal(oidB);
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float normalDot = dot(normalA, normalB);
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isSameObject = normalDot >= NORMAL_THRESHOLD;
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}
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#endif
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if (isSameObject) continue;
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#if EDGE_FUSION_ID_EXCLUSION
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if (IsExcludedIdPair(oidA, oidB)) continue;
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#endif
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// Binary refine between center (uv) and this outer point (uvB)
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float2 a = uvA, b = uvB;
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for (int k = 0; k < _BinarySearchSteps; k++) {
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float2 m = (a + b) * 0.5;
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float4 oidM = SampleObjectData(m);
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// Check object ID sameness (inter-object edges)
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bool sameM = SameObjectIds(oidM, oidA);
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// For intra-object edges, check normal/depth discontinuities
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#if EDGE_FUSION_INTRA_OBJECT || EDGE_FUSION_CONCAVE_ONLY
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if (sameIds && sameM) {
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float3 normalM = GetNormal(oidM);
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sameM = dot(normalA, normalM) >= NORMAL_THRESHOLD;
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}
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#endif
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if (sameM) { a = m; } else { b = m; oidB = oidM; }
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}
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float3 wposB = GetWorldPos(b, oidB.y);
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float distSqr = dot2(wposB - wposA);
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if (distSqr >= maxRadiusWorldSqr) continue;
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#if EDGE_FUSION_ANTI_FLICKER
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float softW = 1.0 / (distSqr + 1e-10);
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sumSoftW += softW;
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accumEdgeUV += b * softW;
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accumEdgeWpos += wposB * softW;
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#else
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if (distSqr >= bestDistSqr) continue;
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#endif
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// Winner tracking drives oidEdge and the early-exit count. When anti-flicker is OFF, this is also where edgeUV/edgeWpos are set
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if (distSqr < bestDistSqr) {
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bestDistSqr = distSqr;
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oidEdge = oidB;
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#if !EDGE_FUSION_ANTI_FLICKER
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edgeUV = b;
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edgeWpos = wposB;
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#endif
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edgeFactor++;
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if (edgeFactor >= _EarlyExitHits) break;
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#if EDGE_FUSION_INTRA_OBJECT || EDGE_FUSION_CONCAVE_ONLY
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edgeCanUseSameIds = sameIds;
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#endif
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}
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}
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if (edgeFactor <= 0.0) return 0.0;
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#if EDGE_FUSION_ANTI_FLICKER
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// Replace edgeUV/edgeWpos with the weighted average and recompute bestDistSqr from the resolved edgeWpos
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edgeUV = accumEdgeUV / sumSoftW;
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edgeWpos = accumEdgeWpos / sumSoftW;
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bestDistSqr = dot2(edgeWpos - wposA);
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#endif
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#if EDGE_FUSION_NOISE
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float noise = SAMPLE_TEXTURE3D_LOD(_NoiseTex3D, sampler_LinearRepeat, wposA * NOISE_SCALE, 0).r;
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noise = smoothstep(0.5 - NOISE_CONTRAST, 0.5 + NOISE_CONTRAST, noise);
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noise *= NOISE_INTENSITY;
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edgeUV -= (uvA - edgeUV) * noise;
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#endif
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// Compute neighbour/mirrored pixel UV
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float2 deltaUV = edgeUV - uvA;
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neighbourUV = edgeUV + deltaUV;
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if (neighbourUV.x < 0.0 || neighbourUV.x > 1.0 || neighbourUV.y < 0.0 || neighbourUV.y > 1.0) return 0.0;
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float4 neighbourData = SampleObjectData(neighbourUV);
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// Is still different object?
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#if !EDGE_FUSION_INTRA_OBJECT && !EDGE_FUSION_CONCAVE_ONLY
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if (SameObjectIds(neighbourData, oidA)) return 0.0;
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#endif
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// Is still the edge object?
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if (!SameObjectIds(neighbourData, oidEdge)) return 0.0;
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// Check neighbour distance (real 3D, using the neighbour's own depth).
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float3 neighbourWpos = GetWorldPos(neighbourUV, neighbourData.y);
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float neighbourDistSqr = dot2(neighbourWpos - edgeWpos);
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// Distance falloff
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float neighbourLinearDepth = LinearEyeDepth(neighbourData.y, _ZBufferParams);
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float neighbourUvRadiusBase = GetRadiusUV(neighbourData, neighbourLinearDepth);
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float neighbourUvRadiusEff = (radiusLimit * neighbourUvRadiusBase) / (neighbourUvRadiusBase + radiusLimit + 1e-6);
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float falloffRadius = min(uvRadiusEff, neighbourUvRadiusEff);
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float reductionFactorSS = length(deltaUV) / falloffRadius;
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float reductionFactorWS = sqrt( max(bestDistSqr, neighbourDistSqr)) / compensatedDefaultRadius;
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edgeFactor = saturate(1.0 - max(reductionFactorSS, reductionFactorWS));
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// Concavity test
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#if EDGE_FUSION_CONCAVE_ONLY
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if (SameObjectIds(neighbourData, oidA)) {
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float3 normalNVS = GetNormal(neighbourData);
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float3 dVS = mul((float3x3)UNITY_MATRIX_V, neighbourWpos - wposA);
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float3 dnVS = normalNVS - normalA;
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float s = dot(dVS, dnVS);
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float nn = dot(dnVS, dnVS);
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const float epsilon = 0.0004;
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bool isConcave = (2.0 * s + epsilon * nn) < 0.0;
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if (!isConcave) return 0.0;
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}
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#endif
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return edgeFactor;
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}
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#endif // EDGE_FUSION_BLEND_LIB_INCLUDED
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