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+/**
+ * @file class3/deferred/reflectionProbeF.glsl
+ *
+ * $LicenseInfo:firstyear=2022&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2022, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
+ * $/LicenseInfo$
+ */
+
+#define FLT_MAX 3.402823466e+38
+
+#if defined(SSR)
+float tapScreenSpaceReflection(int totalSamples, vec2 tc, vec3 viewPos, vec3 n, inout vec4 collectedColor, sampler2D source, float glossiness);
+#endif
+
+uniform samplerCubeArray reflectionProbes;
+uniform samplerCubeArray irradianceProbes;
+uniform sampler2D sceneMap;
+uniform int cube_snapshot;
+uniform float max_probe_lod;
+
+uniform bool transparent_surface;
+
+#define MAX_REFMAP_COUNT 256 // must match LL_MAX_REFLECTION_PROBE_COUNT
+
+layout (std140) uniform ReflectionProbes
+{
+ // list of OBBs for user override probes
+ // box is a set of 3 planes outward facing planes and the depth of the box along that plane
+ // for each box refBox[i]...
+ /// box[0..2] - plane 0 .. 2 in [A,B,C,D] notation
+ // box[3][0..2] - plane thickness
+ mat4 refBox[MAX_REFMAP_COUNT];
+ // list of bounding spheres for reflection probes sorted by distance to camera (closest first)
+ vec4 refSphere[MAX_REFMAP_COUNT];
+ // extra parameters
+ // x - irradiance scale
+ // y - radiance scale
+ // z - fade in
+ // w - znear
+ vec4 refParams[MAX_REFMAP_COUNT];
+ // index of cube map in reflectionProbes for a corresponding reflection probe
+ // e.g. cube map channel of refSphere[2] is stored in refIndex[2]
+ // refIndex.x - cubemap channel in reflectionProbes
+ // refIndex.y - index in refNeighbor of neighbor list (index is ivec4 index, not int index)
+ // refIndex.z - number of neighbors
+ // refIndex.w - priority, if negative, this probe has a box influence
+ ivec4 refIndex[MAX_REFMAP_COUNT];
+
+ // neighbor list data (refSphere indices, not cubemap array layer)
+ ivec4 refNeighbor[1024];
+
+ ivec4 refBucket[256];
+
+ // number of reflection probes present in refSphere
+ int refmapCount;
+};
+
+// Inputs
+uniform mat3 env_mat;
+
+// list of probeIndexes shader will actually use after "getRefIndex" is called
+// (stores refIndex/refSphere indices, NOT rerflectionProbes layer)
+int probeIndex[REF_SAMPLE_COUNT];
+
+// number of probes stored in probeIndex
+int probeInfluences = 0;
+
+bool isAbove(vec3 pos, vec4 plane)
+{
+ return (dot(plane.xyz, pos) + plane.w) > 0;
+}
+
+bool sample_automatic = true;
+
+// return true if probe at index i influences position pos
+bool shouldSampleProbe(int i, vec3 pos)
+{
+ if (refIndex[i].w < 0)
+ {
+ vec4 v = refBox[i] * vec4(pos, 1.0);
+ if (abs(v.x) > 1 ||
+ abs(v.y) > 1 ||
+ abs(v.z) > 1)
+ {
+ return false;
+ }
+
+ // never allow automatic probes to encroach on box probes
+ sample_automatic = false;
+ }
+ else
+ {
+ if (refIndex[i].w == 0 && !sample_automatic)
+ {
+ return false;
+ }
+
+ vec3 delta = pos.xyz - refSphere[i].xyz;
+ float d = dot(delta, delta);
+ float r2 = refSphere[i].w;
+ r2 *= r2;
+
+ if (d > r2)
+ { // outside bounding sphere
+ return false;
+ }
+ }
+
+ return true;
+}
+
+int getStartIndex(vec3 pos)
+{
+#if 1
+ int idx = clamp(int(floor(-pos.z)), 0, 255);
+ return clamp(refBucket[idx].x, 1, refmapCount+1);
+#else
+ return 1;
+#endif
+}
+
+// call before sampleRef
+// populate "probeIndex" with N probe indices that influence pos where N is REF_SAMPLE_COUNT
+void preProbeSample(vec3 pos)
+{
+#if REFMAP_LEVEL > 0
+
+ int start = getStartIndex(pos);
+
+ // TODO: make some sort of structure that reduces the number of distance checks
+ for (int i = start; i < refmapCount; ++i)
+ {
+ // found an influencing probe
+ if (shouldSampleProbe(i, pos))
+ {
+ probeIndex[probeInfluences] = i;
+ ++probeInfluences;
+
+ int neighborIdx = refIndex[i].y;
+ if (neighborIdx != -1)
+ {
+ int neighborCount = refIndex[i].z;
+
+ int count = 0;
+ while (count < neighborCount)
+ {
+ // check up to REF_SAMPLE_COUNT-1 neighbors (neighborIdx is ivec4 index)
+
+ // sample refNeighbor[neighborIdx].x
+ int idx = refNeighbor[neighborIdx].x;
+ if (shouldSampleProbe(idx, pos))
+ {
+ probeIndex[probeInfluences++] = idx;
+ if (probeInfluences == REF_SAMPLE_COUNT)
+ {
+ break;
+ }
+ }
+ count++;
+ if (count == neighborCount)
+ {
+ break;
+ }
+
+ // sample refNeighbor[neighborIdx].y
+ idx = refNeighbor[neighborIdx].y;
+ if (shouldSampleProbe(idx, pos))
+ {
+ probeIndex[probeInfluences++] = idx;
+ if (probeInfluences == REF_SAMPLE_COUNT)
+ {
+ break;
+ }
+ }
+ count++;
+ if (count == neighborCount)
+ {
+ break;
+ }
+
+ // sample refNeighbor[neighborIdx].z
+ idx = refNeighbor[neighborIdx].z;
+ if (shouldSampleProbe(idx, pos))
+ {
+ probeIndex[probeInfluences++] = idx;
+ if (probeInfluences == REF_SAMPLE_COUNT)
+ {
+ break;
+ }
+ }
+ count++;
+ if (count == neighborCount)
+ {
+ break;
+ }
+
+ // sample refNeighbor[neighborIdx].w
+ idx = refNeighbor[neighborIdx].w;
+ if (shouldSampleProbe(idx, pos))
+ {
+ probeIndex[probeInfluences++] = idx;
+ if (probeInfluences == REF_SAMPLE_COUNT)
+ {
+ break;
+ }
+ }
+ count++;
+
+ ++neighborIdx;
+ }
+
+ break;
+ }
+ }
+ }
+
+ if (sample_automatic)
+ { // probe at index 0 is a special probe for smoothing out automatic probes
+ probeIndex[probeInfluences++] = 0;
+ }
+#else
+ probeIndex[probeInfluences++] = 0;
+#endif
+}
+
+// from https://www.scratchapixel.com/lessons/3d-basic-rendering/minimal-ray-tracer-rendering-simple-shapes/ray-sphere-intersection
+
+// original reference implementation:
+/*
+bool intersect(const Ray &ray) const
+{
+ float t0, t1; // solutions for t if the ray intersects
+#if 0
+ // geometric solution
+ Vec3f L = center - orig;
+ float tca = L.dotProduct(dir);
+ // if (tca < 0) return false;
+ float d2 = L.dotProduct(L) - tca * tca;
+ if (d2 > radius2) return false;
+ float thc = sqrt(radius2 - d2);
+ t0 = tca - thc;
+ t1 = tca + thc;
+#else
+ // analytic solution
+ Vec3f L = orig - center;
+ float a = dir.dotProduct(dir);
+ float b = 2 * dir.dotProduct(L);
+ float c = L.dotProduct(L) - radius2;
+ if (!solveQuadratic(a, b, c, t0, t1)) return false;
+#endif
+ if (t0 > t1) std::swap(t0, t1);
+
+ if (t0 < 0) {
+ t0 = t1; // if t0 is negative, let's use t1 instead
+ if (t0 < 0) return false; // both t0 and t1 are negative
+ }
+
+ t = t0;
+
+ return true;
+} */
+
+// adapted -- assume that origin is inside sphere, return intersection of ray with edge of sphere
+vec3 sphereIntersect(vec3 origin, vec3 dir, vec3 center, float radius2)
+{
+ float t0, t1; // solutions for t if the ray intersects
+
+ vec3 L = center - origin;
+ float tca = dot(L,dir);
+
+ float d2 = dot(L,L) - tca * tca;
+
+ float thc = sqrt(radius2 - d2);
+ t0 = tca - thc;
+ t1 = tca + thc;
+
+ vec3 v = origin + dir * t1;
+ return v;
+}
+
+void swap(inout float a, inout float b)
+{
+ float t = a;
+ a = b;
+ b = a;
+}
+
+// debug implementation, make no assumptions about origin
+void sphereIntersectDebug(vec3 origin, vec3 dir, vec3 center, float radius2, float depth, inout vec4 col)
+{
+ float t[2]; // solutions for t if the ray intersects
+
+ // geometric solution
+ vec3 L = center - origin;
+ float tca = dot(L, dir);
+ // if (tca < 0) return false;
+ float d2 = dot(L, L) - tca * tca;
+ if (d2 > radius2) return;
+ float thc = sqrt(radius2 - d2);
+ t[0] = tca - thc;
+ t[1] = tca + thc;
+
+ for (int i = 0; i < 2; ++i)
+ {
+ if (t[i] > 0)
+ {
+ if (t[i] > depth)
+ {
+ float w = 0.125/((t[i]-depth)*0.125 + 1.0);
+ col += vec4(0, 0, w, w)*(1.0-min(col.a, 1.0));
+ }
+ else
+ {
+ float w = 0.25;
+ col += vec4(w,w,0,w)*(1.0-min(col.a, 1.0));
+ }
+ }
+ }
+
+}
+
+// from https://seblagarde.wordpress.com/2012/09/29/image-based-lighting-approaches-and-parallax-corrected-cubemap/
+/*
+vec3 DirectionWS = normalize(PositionWS - CameraWS);
+vec3 ReflDirectionWS = reflect(DirectionWS, NormalWS);
+
+// Intersection with OBB convertto unit box space
+// Transform in local unit parallax cube space (scaled and rotated)
+vec3 RayLS = MulMatrix( float(3x3)WorldToLocal, ReflDirectionWS);
+vec3 PositionLS = MulMatrix( WorldToLocal, PositionWS);
+
+vec3 Unitary = vec3(1.0f, 1.0f, 1.0f);
+vec3 FirstPlaneIntersect = (Unitary - PositionLS) / RayLS;
+vec3 SecondPlaneIntersect = (-Unitary - PositionLS) / RayLS;
+vec3 FurthestPlane = max(FirstPlaneIntersect, SecondPlaneIntersect);
+float Distance = min(FurthestPlane.x, min(FurthestPlane.y, FurthestPlane.z));
+
+// Use Distance in WS directly to recover intersection
+vec3 IntersectPositionWS = PositionWS + ReflDirectionWS * Distance;
+vec3 ReflDirectionWS = IntersectPositionWS - CubemapPositionWS;
+
+return texCUBE(envMap, ReflDirectionWS);
+*/
+
+// get point of intersection with given probe's box influence volume
+// origin - ray origin in clip space
+// dir - ray direction in clip space
+// i - probe index in refBox/refSphere
+// d - distance to nearest wall in clip space
+// scale - scale of box, default 1.0
+vec3 boxIntersect(vec3 origin, vec3 dir, int i, out float d, float scale)
+{
+ // Intersection with OBB convert to unit box space
+ // Transform in local unit parallax cube space (scaled and rotated)
+ mat4 clipToLocal = refBox[i];
+
+ vec3 RayLS = mat3(clipToLocal) * dir;
+ vec3 PositionLS = (clipToLocal * vec4(origin, 1.0)).xyz;
+
+ d = 1.0-max(max(abs(PositionLS.x), abs(PositionLS.y)), abs(PositionLS.z));
+
+ vec3 Unitary = vec3(scale);
+ vec3 FirstPlaneIntersect = (Unitary - PositionLS) / RayLS;
+ vec3 SecondPlaneIntersect = (-Unitary - PositionLS) / RayLS;
+ vec3 FurthestPlane = max(FirstPlaneIntersect, SecondPlaneIntersect);
+ float Distance = min(FurthestPlane.x, min(FurthestPlane.y, FurthestPlane.z));
+
+ // Use Distance in CS directly to recover intersection
+ vec3 IntersectPositionCS = origin + dir * Distance;
+
+ return IntersectPositionCS;
+}
+
+vec3 boxIntersect(vec3 origin, vec3 dir, int i, out float d)
+{
+ return boxIntersect(origin, dir, i, d, 1.0);
+}
+
+void debugBoxCol(vec3 ro, vec3 rd, float t, vec3 p, inout vec4 col)
+{
+ vec3 v = ro + rd * t;
+
+ v -= ro;
+ vec3 pos = p - ro;
+
+
+ bool behind = dot(v,v) > dot(pos,pos);
+
+ float w = 0.25;
+
+ if (behind)
+ {
+ w *= 0.5;
+ w /= (length(v)-length(pos))*0.5+1.0;
+ col += vec4(0,0,w,w)*(1.0-min(col.a, 1.0));
+ }
+ else
+ {
+ col += vec4(w,w,0,w)*(1.0-min(col.a, 1.0));
+ }
+}
+
+// cribbed from https://iquilezles.org/articles/intersectors/
+// axis aligned box centered at the origin, with size boxSize
+void boxIntersectionDebug( in vec3 ro, in vec3 p, vec3 boxSize, inout vec4 col)
+{
+ vec3 rd = normalize(p-ro);
+
+ vec3 m = 1.0/rd; // can precompute if traversing a set of aligned boxes
+ vec3 n = m*ro; // can precompute if traversing a set of aligned boxes
+ vec3 k = abs(m)*boxSize;
+ vec3 t1 = -n - k;
+ vec3 t2 = -n + k;
+ float tN = max( max( t1.x, t1.y ), t1.z );
+ float tF = min( min( t2.x, t2.y ), t2.z );
+ if( tN>tF || tF<0.0) return ; // no intersection
+
+ float t = tN < 0 ? tF : tN;
+
+ debugBoxCol(ro, rd, t, p, col);
+
+ if (tN > 0) // eye is outside box, check backside, too
+ {
+ debugBoxCol(ro, rd, tF, p, col);
+ }
+}
+
+
+void boxIntersectDebug(vec3 origin, vec3 pos, int i, inout vec4 col)
+{
+ mat4 clipToLocal = refBox[i];
+
+ // transform into unit cube space
+ origin = (clipToLocal * vec4(origin, 1.0)).xyz;
+ pos = (clipToLocal * vec4(pos, 1.0)).xyz;
+
+ boxIntersectionDebug(origin, pos, vec3(1), col);
+}
+
+
+// get the weight of a sphere probe
+// pos - position to be weighted
+// dir - normal to be weighted
+// origin - center of sphere probe
+// r - radius of probe influence volume
+// i - index of probe in refSphere
+// dw - distance weight
+float sphereWeight(vec3 pos, vec3 dir, vec3 origin, float r, int i, out float dw)
+{
+ float r1 = r * 0.5; // 50% of radius (outer sphere to start interpolating down)
+ vec3 delta = pos.xyz - origin;
+ float d2 = max(length(delta), 0.001);
+
+ float atten = 1.0 - max(d2 - r1, 0.0) / max((r - r1), 0.001);
+ float w = 1.0 / d2;
+
+ w *= refParams[i].z;
+
+ dw = w * atten * max(r, 1.0)*4;
+
+ w *= atten;
+
+ return w;
+}
+
+// Tap a reflection probe
+// pos - position of pixel
+// dir - pixel normal
+// w - weight of sample (distance and angular attenuation)
+// dw - weight of sample (distance only)
+// lod - which mip to sample (lower is higher res, sharper reflections)
+// c - center of probe
+// r2 - radius of probe squared
+// i - index of probe
+vec3 tapRefMap(vec3 pos, vec3 dir, out float w, out float dw, float lod, vec3 c, int i)
+{
+ // parallax adjustment
+ vec3 v;
+
+ if (refIndex[i].w < 0)
+ { // box probe
+ float d = 0;
+ v = boxIntersect(pos, dir, i, d);
+
+ w = max(d, 0.001);
+ }
+ else
+ { // sphere probe
+ float r = refSphere[i].w;
+
+ float rr = r * r;
+
+ v = sphereIntersect(pos, dir, c,
+ refIndex[i].w < 1 ? 4096.0*4096.0 : // <== effectively disable parallax correction for automatically placed probes to keep from bombing the world with obvious spheres
+ rr);
+
+ w = sphereWeight(pos, dir, refSphere[i].xyz, r, i, dw);
+ }
+
+ v -= c;
+ vec3 d = normalize(v);
+
+ v = env_mat * v;
+
+ vec4 ret = textureLod(reflectionProbes, vec4(v.xyz, refIndex[i].x), lod) * refParams[i].y;
+
+ return ret.rgb;
+}
+
+// Tap an irradiance map
+// pos - position of pixel
+// dir - pixel normal
+// w - weight of sample (distance and angular attenuation)
+// dw - weight of sample (distance only)
+// i - index of probe
+vec3 tapIrradianceMap(vec3 pos, vec3 dir, out float w, out float dw, vec3 c, int i)
+{
+ // parallax adjustment
+ vec3 v;
+ if (refIndex[i].w < 0)
+ {
+ float d = 0.0;
+ v = boxIntersect(pos, dir, i, d, 3.0);
+ w = max(d, 0.001);
+ }
+ else
+ {
+ float r = refSphere[i].w; // radius of sphere volume
+
+ // pad sphere for manual probe extending into automatic probe space
+ float rr = r * r;
+
+ v = sphereIntersect(pos, dir, c,
+ refIndex[i].w < 1 ? 4096.0*4096.0 : // <== effectively disable parallax correction for automatically placed probes to keep from bombing the world with obvious spheres
+ rr);
+
+ w = sphereWeight(pos, dir, refSphere[i].xyz, r, i, dw);
+ }
+
+ v -= c;
+ v = env_mat * v;
+ {
+ return textureLod(irradianceProbes, vec4(v.xyz, refIndex[i].x), 0).rgb * refParams[i].x;
+ }
+}
+
+vec3 sampleProbes(vec3 pos, vec3 dir, float lod)
+{
+ float wsum[2];
+ wsum[0] = 0;
+ wsum[1] = 0;
+
+ float dwsum[2];
+ dwsum[0] = 0;
+ dwsum[1] = 0;
+
+ vec3 col[2];
+ col[0] = vec3(0);
+ col[1] = vec3(0);
+
+ for (int idx = 0; idx < probeInfluences; ++idx)
+ {
+ int i = probeIndex[idx];
+ int p = clamp(abs(refIndex[i].w), 0, 1);
+
+ if (p == 0 && !sample_automatic)
+ {
+ continue;
+ }
+
+ float w = 0;
+ float dw = 0;
+ vec3 refcol;
+
+ {
+ refcol = tapRefMap(pos, dir, w, dw, lod, refSphere[i].xyz, i);
+
+ col[p] += refcol.rgb*w;
+ wsum[p] += w;
+ dwsum[p] += dw;
+ }
+ }
+
+ // mix automatic and manual probes
+ if (sample_automatic && wsum[0] > 0.0)
+ { // some automatic probes were sampled
+ col[0] *= 1.0/wsum[0];
+ if (wsum[1] > 0.0)
+ { //some manual probes were sampled, mix between the two
+ col[1] *= 1.0/wsum[1];
+ col[1] = mix(col[0], col[1], min(dwsum[1], 1.0));
+ col[0] = vec3(0);
+ }
+ }
+ else if (wsum[1] > 0.0)
+ {
+ // manual probes were sampled but no automatic probes were
+ col[1] *= 1.0/wsum[1];
+ col[0] = vec3(0);
+ }
+
+ return col[1]+col[0];
+}
+
+vec3 sampleProbeAmbient(vec3 pos, vec3 dir)
+{
+ // modified copy/paste of sampleProbes follows, will likely diverge from sampleProbes further
+ // as irradiance map mixing is tuned independently of radiance map mixing
+ float wsum[2];
+ wsum[0] = 0;
+ wsum[1] = 0;
+
+ float dwsum[2];
+ dwsum[0] = 0;
+ dwsum[1] = 0;
+
+ vec3 col[2];
+ col[0] = vec3(0);
+ col[1] = vec3(0);
+
+ for (int idx = 0; idx < probeInfluences; ++idx)
+ {
+ int i = probeIndex[idx];
+ int p = clamp(abs(refIndex[i].w), 0, 1);
+
+ if (p == 0 && !sample_automatic)
+ {
+ continue;
+ }
+
+ {
+ float w = 0;
+ float dw = 0;
+
+ vec3 refcol = tapIrradianceMap(pos, dir, w, dw, refSphere[i].xyz, i);
+
+ col[p] += refcol*w;
+ wsum[p] += w;
+ dwsum[p] += dw;
+ }
+ }
+
+ // mix automatic and manual probes
+ if (sample_automatic && wsum[0] > 0.0)
+ { // some automatic probes were sampled
+ col[0] *= 1.0/wsum[0];
+ if (wsum[1] > 0.0)
+ { //some manual probes were sampled, mix between the two
+ col[1] *= 1.0/wsum[1];
+ col[1] = mix(col[0], col[1], min(dwsum[1], 1.0));
+ col[0] = vec3(0);
+ }
+ }
+ else if (wsum[1] > 0.0)
+ {
+ // manual probes were sampled but no automatic probes were
+ col[1] *= 1.0/wsum[1];
+ col[0] = vec3(0);
+ }
+
+ return col[1]+col[0];
+}
+
+void doProbeSample(inout vec3 ambenv, inout vec3 glossenv,
+ vec2 tc, vec3 pos, vec3 norm, float glossiness, bool transparent)
+{
+ // TODO - don't hard code lods
+ float reflection_lods = max_probe_lod;
+
+ vec3 refnormpersp = reflect(pos.xyz, norm.xyz);
+
+ ambenv = sampleProbeAmbient(pos, norm);
+
+ float lod = (1.0-glossiness)*reflection_lods;
+ glossenv = sampleProbes(pos, normalize(refnormpersp), lod);
+
+#if defined(SSR)
+ if (cube_snapshot != 1 && glossiness >= 0.9)
+ {
+ vec4 ssr = vec4(0);
+ if (transparent)
+ {
+ tapScreenSpaceReflection(1, tc, pos, norm, ssr, sceneMap, 1);
+ ssr.a *= glossiness;
+ }
+ else
+ {
+ tapScreenSpaceReflection(1, tc, pos, norm, ssr, sceneMap, glossiness);
+ }
+
+
+ glossenv = mix(glossenv, ssr.rgb, ssr.a);
+ }
+#endif
+}
+
+void sampleReflectionProbes(inout vec3 ambenv, inout vec3 glossenv,
+ vec2 tc, vec3 pos, vec3 norm, float glossiness, bool transparent)
+{
+ preProbeSample(pos);
+ doProbeSample(ambenv, glossenv, tc, pos, norm, glossiness, transparent);
+}
+
+void sampleReflectionProbesWater(inout vec3 ambenv, inout vec3 glossenv,
+ vec2 tc, vec3 pos, vec3 norm, float glossiness)
+{
+ // don't sample automatic probes for water
+ sample_automatic = false;
+ preProbeSample(pos);
+ sample_automatic = true;
+ // always include void probe on water
+ probeIndex[probeInfluences++] = 0;
+
+ doProbeSample(ambenv, glossenv, tc, pos, norm, glossiness, false);
+
+ // fudge factor to get PBR water at a similar luminance ot legacy water
+ glossenv *= 0.4;
+}
+
+void debugTapRefMap(vec3 pos, vec3 dir, float depth, int i, inout vec4 col)
+{
+ vec3 origin = vec3(0,0,0);
+
+ bool manual_probe = abs(refIndex[i].w) > 0;
+
+ if (manual_probe)
+ {
+ if (refIndex[i].w < 0)
+ {
+ boxIntersectDebug(origin, pos, i, col);
+ }
+ else
+ {
+ float r = refSphere[i].w; // radius of sphere volume
+ float rr = r * r; // radius squared
+
+ float t = 0.0;
+
+ sphereIntersectDebug(origin, dir, refSphere[i].xyz, rr, depth, col);
+ }
+ }
+}
+
+vec4 sampleReflectionProbesDebug(vec3 pos)
+{
+ vec4 col = vec4(0,0,0,0);
+
+ vec3 dir = normalize(pos);
+
+ float d = length(pos);
+
+ for (int i = 1; i < refmapCount; ++i)
+ {
+ debugTapRefMap(pos, dir, d, i, col);
+ }
+
+#if 0 //debug getStartIndex
+ col.g = float(getStartIndex(pos));
+
+ col.g /= 255.0;
+ col.rb = vec2(0);
+ col.a = 1.0;
+#endif
+
+ return col;
+}
+
+void sampleReflectionProbesLegacy(inout vec3 ambenv, inout vec3 glossenv, inout vec3 legacyenv,
+ vec2 tc, vec3 pos, vec3 norm, float glossiness, float envIntensity, bool transparent)
+{
+ float reflection_lods = max_probe_lod;
+ preProbeSample(pos);
+
+ vec3 refnormpersp = reflect(pos.xyz, norm.xyz);
+
+ ambenv = sampleProbeAmbient(pos, norm);
+
+ if (glossiness > 0.0)
+ {
+ float lod = (1.0-glossiness)*reflection_lods;
+ glossenv = sampleProbes(pos, normalize(refnormpersp), lod);
+ }
+
+ if (envIntensity > 0.0)
+ {
+ legacyenv = sampleProbes(pos, normalize(refnormpersp), 0.0);
+ }
+
+#if defined(SSR)
+ if (cube_snapshot != 1)
+ {
+ vec4 ssr = vec4(0);
+
+ if (transparent)
+ {
+ tapScreenSpaceReflection(1, tc, pos, norm, ssr, sceneMap, 1);
+ ssr.a *= glossiness;
+ }
+ else
+ {
+ tapScreenSpaceReflection(1, tc, pos, norm, ssr, sceneMap, glossiness);
+ }
+
+ glossenv = mix(glossenv, ssr.rgb, ssr.a);
+ legacyenv = mix(legacyenv, ssr.rgb, ssr.a);
+ }
+#endif
+
+ glossenv = clamp(glossenv, vec3(0), vec3(10));
+}
+
+void applyGlossEnv(inout vec3 color, vec3 glossenv, vec4 spec, vec3 pos, vec3 norm)
+{
+ glossenv *= 0.5; // fudge darker
+ float fresnel = clamp(1.0+dot(normalize(pos.xyz), norm.xyz), 0.3, 1.0);
+ fresnel *= fresnel;
+ fresnel *= spec.a;
+ glossenv *= spec.rgb*fresnel;
+ glossenv *= vec3(1.0) - color; // fake energy conservation
+ color.rgb += glossenv*0.5;
+}
+
+ void applyLegacyEnv(inout vec3 color, vec3 legacyenv, vec4 spec, vec3 pos, vec3 norm, float envIntensity)
+ {
+ vec3 reflected_color = legacyenv;
+ vec3 lookAt = normalize(pos);
+ float fresnel = 1.0+dot(lookAt, norm.xyz);
+ fresnel *= fresnel;
+ fresnel = min(fresnel+envIntensity, 1.0);
+ reflected_color *= (envIntensity*fresnel);
+ color = mix(color.rgb, reflected_color*0.5, envIntensity);
+ }
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-10-02 22:21:22 +0000