forked from bartvdbraak/blender
340cbc7f15
The current 1D Voronoi implementation for the Distance to Edge option computes the distance to the cells instead. This patch fixes that and compute the distance to the edge. Reviewed By: JacquesLucke, brecht Differential Revision: https://developer.blender.org/D8634
1139 lines
42 KiB
C
1139 lines
42 KiB
C
/*
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* Copyright 2011-2013 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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CCL_NAMESPACE_BEGIN
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/*
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* Smooth Voronoi:
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*
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* - https://wiki.blender.org/wiki/User:OmarSquircleArt/GSoC2019/Documentation/Smooth_Voronoi
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*
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* Distance To Edge:
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*
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* - https://www.shadertoy.com/view/llG3zy
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*
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*/
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/* **** 1D Voronoi **** */
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ccl_device float voronoi_distance_1d(float a,
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float b,
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NodeVoronoiDistanceMetric metric,
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float exponent)
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{
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return fabsf(b - a);
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}
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ccl_device void voronoi_f1_1d(float w,
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float exponent,
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float randomness,
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NodeVoronoiDistanceMetric metric,
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float *outDistance,
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float3 *outColor,
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float *outW)
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{
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float cellPosition = floorf(w);
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float localPosition = w - cellPosition;
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float minDistance = 8.0f;
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float targetOffset = 0.0f;
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float targetPosition = 0.0f;
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for (int i = -1; i <= 1; i++) {
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float cellOffset = i;
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float pointPosition = cellOffset + hash_float_to_float(cellPosition + cellOffset) * randomness;
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float distanceToPoint = voronoi_distance_1d(pointPosition, localPosition, metric, exponent);
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if (distanceToPoint < minDistance) {
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targetOffset = cellOffset;
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minDistance = distanceToPoint;
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targetPosition = pointPosition;
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}
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}
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*outDistance = minDistance;
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*outColor = hash_float_to_float3(cellPosition + targetOffset);
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*outW = targetPosition + cellPosition;
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}
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ccl_device void voronoi_smooth_f1_1d(float w,
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float smoothness,
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float exponent,
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float randomness,
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NodeVoronoiDistanceMetric metric,
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float *outDistance,
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float3 *outColor,
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float *outW)
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{
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float cellPosition = floorf(w);
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float localPosition = w - cellPosition;
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float smoothDistance = 8.0f;
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float smoothPosition = 0.0f;
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float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
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for (int i = -2; i <= 2; i++) {
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float cellOffset = i;
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float pointPosition = cellOffset + hash_float_to_float(cellPosition + cellOffset) * randomness;
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float distanceToPoint = voronoi_distance_1d(pointPosition, localPosition, metric, exponent);
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float h = smoothstep(
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0.0f, 1.0f, 0.5f + 0.5f * (smoothDistance - distanceToPoint) / smoothness);
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float correctionFactor = smoothness * h * (1.0f - h);
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smoothDistance = mix(smoothDistance, distanceToPoint, h) - correctionFactor;
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correctionFactor /= 1.0f + 3.0f * smoothness;
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float3 cellColor = hash_float_to_float3(cellPosition + cellOffset);
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smoothColor = mix(smoothColor, cellColor, h) - correctionFactor;
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smoothPosition = mix(smoothPosition, pointPosition, h) - correctionFactor;
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}
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*outDistance = smoothDistance;
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*outColor = smoothColor;
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*outW = cellPosition + smoothPosition;
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}
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ccl_device void voronoi_f2_1d(float w,
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float exponent,
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float randomness,
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NodeVoronoiDistanceMetric metric,
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float *outDistance,
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float3 *outColor,
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float *outW)
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{
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float cellPosition = floorf(w);
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float localPosition = w - cellPosition;
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float distanceF1 = 8.0f;
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float distanceF2 = 8.0f;
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float offsetF1 = 0.0f;
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float positionF1 = 0.0f;
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float offsetF2 = 0.0f;
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float positionF2 = 0.0f;
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for (int i = -1; i <= 1; i++) {
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float cellOffset = i;
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float pointPosition = cellOffset + hash_float_to_float(cellPosition + cellOffset) * randomness;
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float distanceToPoint = voronoi_distance_1d(pointPosition, localPosition, metric, exponent);
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if (distanceToPoint < distanceF1) {
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distanceF2 = distanceF1;
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distanceF1 = distanceToPoint;
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offsetF2 = offsetF1;
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offsetF1 = cellOffset;
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positionF2 = positionF1;
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positionF1 = pointPosition;
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}
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else if (distanceToPoint < distanceF2) {
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distanceF2 = distanceToPoint;
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offsetF2 = cellOffset;
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positionF2 = pointPosition;
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}
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}
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*outDistance = distanceF2;
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*outColor = hash_float_to_float3(cellPosition + offsetF2);
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*outW = positionF2 + cellPosition;
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}
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ccl_device void voronoi_distance_to_edge_1d(float w, float randomness, float *outDistance)
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{
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float cellPosition = floorf(w);
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float localPosition = w - cellPosition;
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float midPointPosition = hash_float_to_float(cellPosition) * randomness;
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float leftPointPosition = -1.0f + hash_float_to_float(cellPosition - 1.0f) * randomness;
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float rightPointPosition = 1.0f + hash_float_to_float(cellPosition + 1.0f) * randomness;
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float distanceToMidLeft = fabsf((midPointPosition + leftPointPosition) / 2.0f - localPosition);
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float distanceToMidRight = fabsf((midPointPosition + rightPointPosition) / 2.0f - localPosition);
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*outDistance = min(distanceToMidLeft, distanceToMidRight);
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}
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ccl_device void voronoi_n_sphere_radius_1d(float w, float randomness, float *outRadius)
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{
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float cellPosition = floorf(w);
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float localPosition = w - cellPosition;
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float closestPoint = 0.0f;
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float closestPointOffset = 0.0f;
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float minDistance = 8.0f;
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for (int i = -1; i <= 1; i++) {
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float cellOffset = i;
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float pointPosition = cellOffset + hash_float_to_float(cellPosition + cellOffset) * randomness;
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float distanceToPoint = fabsf(pointPosition - localPosition);
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if (distanceToPoint < minDistance) {
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minDistance = distanceToPoint;
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closestPoint = pointPosition;
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closestPointOffset = cellOffset;
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}
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}
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minDistance = 8.0f;
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float closestPointToClosestPoint = 0.0f;
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for (int i = -1; i <= 1; i++) {
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if (i == 0) {
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continue;
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}
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float cellOffset = i + closestPointOffset;
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float pointPosition = cellOffset + hash_float_to_float(cellPosition + cellOffset) * randomness;
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float distanceToPoint = fabsf(closestPoint - pointPosition);
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if (distanceToPoint < minDistance) {
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minDistance = distanceToPoint;
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closestPointToClosestPoint = pointPosition;
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}
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}
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*outRadius = fabsf(closestPointToClosestPoint - closestPoint) / 2.0f;
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}
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/* **** 2D Voronoi **** */
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ccl_device float voronoi_distance_2d(float2 a,
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float2 b,
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NodeVoronoiDistanceMetric metric,
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float exponent)
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{
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if (metric == NODE_VORONOI_EUCLIDEAN) {
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return distance(a, b);
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}
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else if (metric == NODE_VORONOI_MANHATTAN) {
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return fabsf(a.x - b.x) + fabsf(a.y - b.y);
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}
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else if (metric == NODE_VORONOI_CHEBYCHEV) {
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return max(fabsf(a.x - b.x), fabsf(a.y - b.y));
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}
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else if (metric == NODE_VORONOI_MINKOWSKI) {
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return powf(powf(fabsf(a.x - b.x), exponent) + powf(fabsf(a.y - b.y), exponent),
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1.0f / exponent);
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}
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else {
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return 0.0f;
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}
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}
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ccl_device void voronoi_f1_2d(float2 coord,
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float exponent,
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float randomness,
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NodeVoronoiDistanceMetric metric,
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float *outDistance,
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float3 *outColor,
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float2 *outPosition)
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{
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float2 cellPosition = floor(coord);
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float2 localPosition = coord - cellPosition;
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float minDistance = 8.0f;
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float2 targetOffset = make_float2(0.0f, 0.0f);
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float2 targetPosition = make_float2(0.0f, 0.0f);
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for (int j = -1; j <= 1; j++) {
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for (int i = -1; i <= 1; i++) {
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float2 cellOffset = make_float2(i, j);
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float2 pointPosition = cellOffset +
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hash_float2_to_float2(cellPosition + cellOffset) * randomness;
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float distanceToPoint = voronoi_distance_2d(pointPosition, localPosition, metric, exponent);
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if (distanceToPoint < minDistance) {
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targetOffset = cellOffset;
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minDistance = distanceToPoint;
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targetPosition = pointPosition;
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}
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}
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}
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*outDistance = minDistance;
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*outColor = hash_float2_to_float3(cellPosition + targetOffset);
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*outPosition = targetPosition + cellPosition;
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}
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ccl_device void voronoi_smooth_f1_2d(float2 coord,
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float smoothness,
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float exponent,
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float randomness,
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NodeVoronoiDistanceMetric metric,
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float *outDistance,
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float3 *outColor,
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float2 *outPosition)
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{
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float2 cellPosition = floor(coord);
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float2 localPosition = coord - cellPosition;
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float smoothDistance = 8.0f;
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float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
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float2 smoothPosition = make_float2(0.0f, 0.0f);
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for (int j = -2; j <= 2; j++) {
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for (int i = -2; i <= 2; i++) {
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float2 cellOffset = make_float2(i, j);
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float2 pointPosition = cellOffset +
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hash_float2_to_float2(cellPosition + cellOffset) * randomness;
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float distanceToPoint = voronoi_distance_2d(pointPosition, localPosition, metric, exponent);
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float h = smoothstep(
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0.0f, 1.0f, 0.5f + 0.5f * (smoothDistance - distanceToPoint) / smoothness);
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float correctionFactor = smoothness * h * (1.0f - h);
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smoothDistance = mix(smoothDistance, distanceToPoint, h) - correctionFactor;
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correctionFactor /= 1.0f + 3.0f * smoothness;
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float3 cellColor = hash_float2_to_float3(cellPosition + cellOffset);
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smoothColor = mix(smoothColor, cellColor, h) - correctionFactor;
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smoothPosition = mix(smoothPosition, pointPosition, h) - correctionFactor;
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}
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}
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*outDistance = smoothDistance;
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*outColor = smoothColor;
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*outPosition = cellPosition + smoothPosition;
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}
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ccl_device void voronoi_f2_2d(float2 coord,
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float exponent,
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float randomness,
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NodeVoronoiDistanceMetric metric,
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float *outDistance,
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float3 *outColor,
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float2 *outPosition)
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{
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float2 cellPosition = floor(coord);
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float2 localPosition = coord - cellPosition;
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float distanceF1 = 8.0f;
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float distanceF2 = 8.0f;
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float2 offsetF1 = make_float2(0.0f, 0.0f);
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float2 positionF1 = make_float2(0.0f, 0.0f);
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float2 offsetF2 = make_float2(0.0f, 0.0f);
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float2 positionF2 = make_float2(0.0f, 0.0f);
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for (int j = -1; j <= 1; j++) {
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for (int i = -1; i <= 1; i++) {
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float2 cellOffset = make_float2(i, j);
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float2 pointPosition = cellOffset +
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hash_float2_to_float2(cellPosition + cellOffset) * randomness;
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float distanceToPoint = voronoi_distance_2d(pointPosition, localPosition, metric, exponent);
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if (distanceToPoint < distanceF1) {
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distanceF2 = distanceF1;
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distanceF1 = distanceToPoint;
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offsetF2 = offsetF1;
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offsetF1 = cellOffset;
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positionF2 = positionF1;
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positionF1 = pointPosition;
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}
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else if (distanceToPoint < distanceF2) {
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distanceF2 = distanceToPoint;
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offsetF2 = cellOffset;
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positionF2 = pointPosition;
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}
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}
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}
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*outDistance = distanceF2;
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*outColor = hash_float2_to_float3(cellPosition + offsetF2);
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*outPosition = positionF2 + cellPosition;
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}
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ccl_device void voronoi_distance_to_edge_2d(float2 coord, float randomness, float *outDistance)
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{
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float2 cellPosition = floor(coord);
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float2 localPosition = coord - cellPosition;
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float2 vectorToClosest = make_float2(0.0f, 0.0f);
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float minDistance = 8.0f;
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for (int j = -1; j <= 1; j++) {
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for (int i = -1; i <= 1; i++) {
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float2 cellOffset = make_float2(i, j);
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float2 vectorToPoint = cellOffset +
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hash_float2_to_float2(cellPosition + cellOffset) * randomness -
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localPosition;
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float distanceToPoint = dot(vectorToPoint, vectorToPoint);
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if (distanceToPoint < minDistance) {
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minDistance = distanceToPoint;
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vectorToClosest = vectorToPoint;
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}
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}
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}
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minDistance = 8.0f;
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for (int j = -1; j <= 1; j++) {
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for (int i = -1; i <= 1; i++) {
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float2 cellOffset = make_float2(i, j);
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float2 vectorToPoint = cellOffset +
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hash_float2_to_float2(cellPosition + cellOffset) * randomness -
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localPosition;
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float2 perpendicularToEdge = vectorToPoint - vectorToClosest;
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if (dot(perpendicularToEdge, perpendicularToEdge) > 0.0001f) {
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float distanceToEdge = dot((vectorToClosest + vectorToPoint) / 2.0f,
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normalize(perpendicularToEdge));
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minDistance = min(minDistance, distanceToEdge);
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}
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}
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}
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*outDistance = minDistance;
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}
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ccl_device void voronoi_n_sphere_radius_2d(float2 coord, float randomness, float *outRadius)
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{
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float2 cellPosition = floor(coord);
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float2 localPosition = coord - cellPosition;
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float2 closestPoint = make_float2(0.0f, 0.0f);
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float2 closestPointOffset = make_float2(0.0f, 0.0f);
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float minDistance = 8.0f;
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for (int j = -1; j <= 1; j++) {
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for (int i = -1; i <= 1; i++) {
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float2 cellOffset = make_float2(i, j);
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float2 pointPosition = cellOffset +
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hash_float2_to_float2(cellPosition + cellOffset) * randomness;
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float distanceToPoint = distance(pointPosition, localPosition);
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if (distanceToPoint < minDistance) {
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minDistance = distanceToPoint;
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closestPoint = pointPosition;
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closestPointOffset = cellOffset;
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}
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}
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}
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minDistance = 8.0f;
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float2 closestPointToClosestPoint = make_float2(0.0f, 0.0f);
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for (int j = -1; j <= 1; j++) {
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for (int i = -1; i <= 1; i++) {
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if (i == 0 && j == 0) {
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continue;
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}
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float2 cellOffset = make_float2(i, j) + closestPointOffset;
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float2 pointPosition = cellOffset +
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hash_float2_to_float2(cellPosition + cellOffset) * randomness;
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float distanceToPoint = distance(closestPoint, pointPosition);
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if (distanceToPoint < minDistance) {
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minDistance = distanceToPoint;
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closestPointToClosestPoint = pointPosition;
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}
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}
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}
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*outRadius = distance(closestPointToClosestPoint, closestPoint) / 2.0f;
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}
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/* **** 3D Voronoi **** */
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ccl_device float voronoi_distance_3d(float3 a,
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float3 b,
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NodeVoronoiDistanceMetric metric,
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float exponent)
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{
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if (metric == NODE_VORONOI_EUCLIDEAN) {
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return distance(a, b);
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}
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else if (metric == NODE_VORONOI_MANHATTAN) {
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return fabsf(a.x - b.x) + fabsf(a.y - b.y) + fabsf(a.z - b.z);
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}
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else if (metric == NODE_VORONOI_CHEBYCHEV) {
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return max(fabsf(a.x - b.x), max(fabsf(a.y - b.y), fabsf(a.z - b.z)));
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}
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else if (metric == NODE_VORONOI_MINKOWSKI) {
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return powf(powf(fabsf(a.x - b.x), exponent) + powf(fabsf(a.y - b.y), exponent) +
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powf(fabsf(a.z - b.z), exponent),
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1.0f / exponent);
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}
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else {
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return 0.0f;
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}
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}
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ccl_device void voronoi_f1_3d(float3 coord,
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float exponent,
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float randomness,
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NodeVoronoiDistanceMetric metric,
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float *outDistance,
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float3 *outColor,
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float3 *outPosition)
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{
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float3 cellPosition = floor(coord);
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float3 localPosition = coord - cellPosition;
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float minDistance = 8.0f;
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float3 targetOffset = make_float3(0.0f, 0.0f, 0.0f);
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float3 targetPosition = make_float3(0.0f, 0.0f, 0.0f);
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for (int k = -1; k <= 1; k++) {
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for (int j = -1; j <= 1; j++) {
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for (int i = -1; i <= 1; i++) {
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float3 cellOffset = make_float3(i, j, k);
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float3 pointPosition = cellOffset +
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hash_float3_to_float3(cellPosition + cellOffset) * randomness;
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float distanceToPoint = voronoi_distance_3d(
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pointPosition, localPosition, metric, exponent);
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if (distanceToPoint < minDistance) {
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targetOffset = cellOffset;
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minDistance = distanceToPoint;
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targetPosition = pointPosition;
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}
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}
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}
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}
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*outDistance = minDistance;
|
|
*outColor = hash_float3_to_float3(cellPosition + targetOffset);
|
|
*outPosition = targetPosition + cellPosition;
|
|
}
|
|
|
|
ccl_device void voronoi_smooth_f1_3d(float3 coord,
|
|
float smoothness,
|
|
float exponent,
|
|
float randomness,
|
|
NodeVoronoiDistanceMetric metric,
|
|
float *outDistance,
|
|
float3 *outColor,
|
|
float3 *outPosition)
|
|
{
|
|
float3 cellPosition = floor(coord);
|
|
float3 localPosition = coord - cellPosition;
|
|
|
|
float smoothDistance = 8.0f;
|
|
float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
|
|
float3 smoothPosition = make_float3(0.0f, 0.0f, 0.0f);
|
|
for (int k = -2; k <= 2; k++) {
|
|
for (int j = -2; j <= 2; j++) {
|
|
for (int i = -2; i <= 2; i++) {
|
|
float3 cellOffset = make_float3(i, j, k);
|
|
float3 pointPosition = cellOffset +
|
|
hash_float3_to_float3(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = voronoi_distance_3d(
|
|
pointPosition, localPosition, metric, exponent);
|
|
float h = smoothstep(
|
|
0.0f, 1.0f, 0.5f + 0.5f * (smoothDistance - distanceToPoint) / smoothness);
|
|
float correctionFactor = smoothness * h * (1.0f - h);
|
|
smoothDistance = mix(smoothDistance, distanceToPoint, h) - correctionFactor;
|
|
correctionFactor /= 1.0f + 3.0f * smoothness;
|
|
float3 cellColor = hash_float3_to_float3(cellPosition + cellOffset);
|
|
smoothColor = mix(smoothColor, cellColor, h) - correctionFactor;
|
|
smoothPosition = mix(smoothPosition, pointPosition, h) - correctionFactor;
|
|
}
|
|
}
|
|
}
|
|
*outDistance = smoothDistance;
|
|
*outColor = smoothColor;
|
|
*outPosition = cellPosition + smoothPosition;
|
|
}
|
|
|
|
ccl_device void voronoi_f2_3d(float3 coord,
|
|
float exponent,
|
|
float randomness,
|
|
NodeVoronoiDistanceMetric metric,
|
|
float *outDistance,
|
|
float3 *outColor,
|
|
float3 *outPosition)
|
|
{
|
|
float3 cellPosition = floor(coord);
|
|
float3 localPosition = coord - cellPosition;
|
|
|
|
float distanceF1 = 8.0f;
|
|
float distanceF2 = 8.0f;
|
|
float3 offsetF1 = make_float3(0.0f, 0.0f, 0.0f);
|
|
float3 positionF1 = make_float3(0.0f, 0.0f, 0.0f);
|
|
float3 offsetF2 = make_float3(0.0f, 0.0f, 0.0f);
|
|
float3 positionF2 = make_float3(0.0f, 0.0f, 0.0f);
|
|
for (int k = -1; k <= 1; k++) {
|
|
for (int j = -1; j <= 1; j++) {
|
|
for (int i = -1; i <= 1; i++) {
|
|
float3 cellOffset = make_float3(i, j, k);
|
|
float3 pointPosition = cellOffset +
|
|
hash_float3_to_float3(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = voronoi_distance_3d(
|
|
pointPosition, localPosition, metric, exponent);
|
|
if (distanceToPoint < distanceF1) {
|
|
distanceF2 = distanceF1;
|
|
distanceF1 = distanceToPoint;
|
|
offsetF2 = offsetF1;
|
|
offsetF1 = cellOffset;
|
|
positionF2 = positionF1;
|
|
positionF1 = pointPosition;
|
|
}
|
|
else if (distanceToPoint < distanceF2) {
|
|
distanceF2 = distanceToPoint;
|
|
offsetF2 = cellOffset;
|
|
positionF2 = pointPosition;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outDistance = distanceF2;
|
|
*outColor = hash_float3_to_float3(cellPosition + offsetF2);
|
|
*outPosition = positionF2 + cellPosition;
|
|
}
|
|
|
|
ccl_device void voronoi_distance_to_edge_3d(float3 coord, float randomness, float *outDistance)
|
|
{
|
|
float3 cellPosition = floor(coord);
|
|
float3 localPosition = coord - cellPosition;
|
|
|
|
float3 vectorToClosest = make_float3(0.0f, 0.0f, 0.0f);
|
|
float minDistance = 8.0f;
|
|
for (int k = -1; k <= 1; k++) {
|
|
for (int j = -1; j <= 1; j++) {
|
|
for (int i = -1; i <= 1; i++) {
|
|
float3 cellOffset = make_float3(i, j, k);
|
|
float3 vectorToPoint = cellOffset +
|
|
hash_float3_to_float3(cellPosition + cellOffset) * randomness -
|
|
localPosition;
|
|
float distanceToPoint = dot(vectorToPoint, vectorToPoint);
|
|
if (distanceToPoint < minDistance) {
|
|
minDistance = distanceToPoint;
|
|
vectorToClosest = vectorToPoint;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
minDistance = 8.0f;
|
|
for (int k = -1; k <= 1; k++) {
|
|
for (int j = -1; j <= 1; j++) {
|
|
for (int i = -1; i <= 1; i++) {
|
|
float3 cellOffset = make_float3(i, j, k);
|
|
float3 vectorToPoint = cellOffset +
|
|
hash_float3_to_float3(cellPosition + cellOffset) * randomness -
|
|
localPosition;
|
|
float3 perpendicularToEdge = vectorToPoint - vectorToClosest;
|
|
if (dot(perpendicularToEdge, perpendicularToEdge) > 0.0001f) {
|
|
float distanceToEdge = dot((vectorToClosest + vectorToPoint) / 2.0f,
|
|
normalize(perpendicularToEdge));
|
|
minDistance = min(minDistance, distanceToEdge);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outDistance = minDistance;
|
|
}
|
|
|
|
ccl_device void voronoi_n_sphere_radius_3d(float3 coord, float randomness, float *outRadius)
|
|
{
|
|
float3 cellPosition = floor(coord);
|
|
float3 localPosition = coord - cellPosition;
|
|
|
|
float3 closestPoint = make_float3(0.0f, 0.0f, 0.0f);
|
|
float3 closestPointOffset = make_float3(0.0f, 0.0f, 0.0f);
|
|
float minDistance = 8.0f;
|
|
for (int k = -1; k <= 1; k++) {
|
|
for (int j = -1; j <= 1; j++) {
|
|
for (int i = -1; i <= 1; i++) {
|
|
float3 cellOffset = make_float3(i, j, k);
|
|
float3 pointPosition = cellOffset +
|
|
hash_float3_to_float3(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = distance(pointPosition, localPosition);
|
|
if (distanceToPoint < minDistance) {
|
|
minDistance = distanceToPoint;
|
|
closestPoint = pointPosition;
|
|
closestPointOffset = cellOffset;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
minDistance = 8.0f;
|
|
float3 closestPointToClosestPoint = make_float3(0.0f, 0.0f, 0.0f);
|
|
for (int k = -1; k <= 1; k++) {
|
|
for (int j = -1; j <= 1; j++) {
|
|
for (int i = -1; i <= 1; i++) {
|
|
if (i == 0 && j == 0 && k == 0) {
|
|
continue;
|
|
}
|
|
float3 cellOffset = make_float3(i, j, k) + closestPointOffset;
|
|
float3 pointPosition = cellOffset +
|
|
hash_float3_to_float3(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = distance(closestPoint, pointPosition);
|
|
if (distanceToPoint < minDistance) {
|
|
minDistance = distanceToPoint;
|
|
closestPointToClosestPoint = pointPosition;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outRadius = distance(closestPointToClosestPoint, closestPoint) / 2.0f;
|
|
}
|
|
|
|
/* **** 4D Voronoi **** */
|
|
|
|
ccl_device float voronoi_distance_4d(float4 a,
|
|
float4 b,
|
|
NodeVoronoiDistanceMetric metric,
|
|
float exponent)
|
|
{
|
|
if (metric == NODE_VORONOI_EUCLIDEAN) {
|
|
return distance(a, b);
|
|
}
|
|
else if (metric == NODE_VORONOI_MANHATTAN) {
|
|
return fabsf(a.x - b.x) + fabsf(a.y - b.y) + fabsf(a.z - b.z) + fabsf(a.w - b.w);
|
|
}
|
|
else if (metric == NODE_VORONOI_CHEBYCHEV) {
|
|
return max(fabsf(a.x - b.x), max(fabsf(a.y - b.y), max(fabsf(a.z - b.z), fabsf(a.w - b.w))));
|
|
}
|
|
else if (metric == NODE_VORONOI_MINKOWSKI) {
|
|
return powf(powf(fabsf(a.x - b.x), exponent) + powf(fabsf(a.y - b.y), exponent) +
|
|
powf(fabsf(a.z - b.z), exponent) + powf(fabsf(a.w - b.w), exponent),
|
|
1.0f / exponent);
|
|
}
|
|
else {
|
|
return 0.0f;
|
|
}
|
|
}
|
|
|
|
ccl_device void voronoi_f1_4d(float4 coord,
|
|
float exponent,
|
|
float randomness,
|
|
NodeVoronoiDistanceMetric metric,
|
|
float *outDistance,
|
|
float3 *outColor,
|
|
float4 *outPosition)
|
|
{
|
|
float4 cellPosition = floor(coord);
|
|
float4 localPosition = coord - cellPosition;
|
|
|
|
float minDistance = 8.0f;
|
|
float4 targetOffset = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
float4 targetPosition = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
for (int u = -1; u <= 1; u++) {
|
|
for (int k = -1; k <= 1; k++) {
|
|
ccl_loop_no_unroll for (int j = -1; j <= 1; j++)
|
|
{
|
|
for (int i = -1; i <= 1; i++) {
|
|
float4 cellOffset = make_float4(i, j, k, u);
|
|
float4 pointPosition = cellOffset +
|
|
hash_float4_to_float4(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = voronoi_distance_4d(
|
|
pointPosition, localPosition, metric, exponent);
|
|
if (distanceToPoint < minDistance) {
|
|
targetOffset = cellOffset;
|
|
minDistance = distanceToPoint;
|
|
targetPosition = pointPosition;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outDistance = minDistance;
|
|
*outColor = hash_float4_to_float3(cellPosition + targetOffset);
|
|
*outPosition = targetPosition + cellPosition;
|
|
}
|
|
|
|
ccl_device void voronoi_smooth_f1_4d(float4 coord,
|
|
float smoothness,
|
|
float exponent,
|
|
float randomness,
|
|
NodeVoronoiDistanceMetric metric,
|
|
float *outDistance,
|
|
float3 *outColor,
|
|
float4 *outPosition)
|
|
{
|
|
float4 cellPosition = floor(coord);
|
|
float4 localPosition = coord - cellPosition;
|
|
|
|
float smoothDistance = 8.0f;
|
|
float3 smoothColor = make_float3(0.0f, 0.0f, 0.0f);
|
|
float4 smoothPosition = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
for (int u = -2; u <= 2; u++) {
|
|
for (int k = -2; k <= 2; k++) {
|
|
ccl_loop_no_unroll for (int j = -2; j <= 2; j++)
|
|
{
|
|
for (int i = -2; i <= 2; i++) {
|
|
float4 cellOffset = make_float4(i, j, k, u);
|
|
float4 pointPosition = cellOffset +
|
|
hash_float4_to_float4(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = voronoi_distance_4d(
|
|
pointPosition, localPosition, metric, exponent);
|
|
float h = smoothstep(
|
|
0.0f, 1.0f, 0.5f + 0.5f * (smoothDistance - distanceToPoint) / smoothness);
|
|
float correctionFactor = smoothness * h * (1.0f - h);
|
|
smoothDistance = mix(smoothDistance, distanceToPoint, h) - correctionFactor;
|
|
correctionFactor /= 1.0f + 3.0f * smoothness;
|
|
float3 cellColor = hash_float4_to_float3(cellPosition + cellOffset);
|
|
smoothColor = mix(smoothColor, cellColor, h) - correctionFactor;
|
|
smoothPosition = mix(smoothPosition, pointPosition, h) - correctionFactor;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outDistance = smoothDistance;
|
|
*outColor = smoothColor;
|
|
*outPosition = cellPosition + smoothPosition;
|
|
}
|
|
|
|
ccl_device void voronoi_f2_4d(float4 coord,
|
|
float exponent,
|
|
float randomness,
|
|
NodeVoronoiDistanceMetric metric,
|
|
float *outDistance,
|
|
float3 *outColor,
|
|
float4 *outPosition)
|
|
{
|
|
float4 cellPosition = floor(coord);
|
|
float4 localPosition = coord - cellPosition;
|
|
|
|
float distanceF1 = 8.0f;
|
|
float distanceF2 = 8.0f;
|
|
float4 offsetF1 = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
float4 positionF1 = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
float4 offsetF2 = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
float4 positionF2 = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
for (int u = -1; u <= 1; u++) {
|
|
for (int k = -1; k <= 1; k++) {
|
|
ccl_loop_no_unroll for (int j = -1; j <= 1; j++)
|
|
{
|
|
for (int i = -1; i <= 1; i++) {
|
|
float4 cellOffset = make_float4(i, j, k, u);
|
|
float4 pointPosition = cellOffset +
|
|
hash_float4_to_float4(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = voronoi_distance_4d(
|
|
pointPosition, localPosition, metric, exponent);
|
|
if (distanceToPoint < distanceF1) {
|
|
distanceF2 = distanceF1;
|
|
distanceF1 = distanceToPoint;
|
|
offsetF2 = offsetF1;
|
|
offsetF1 = cellOffset;
|
|
positionF2 = positionF1;
|
|
positionF1 = pointPosition;
|
|
}
|
|
else if (distanceToPoint < distanceF2) {
|
|
distanceF2 = distanceToPoint;
|
|
offsetF2 = cellOffset;
|
|
positionF2 = pointPosition;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outDistance = distanceF2;
|
|
*outColor = hash_float4_to_float3(cellPosition + offsetF2);
|
|
*outPosition = positionF2 + cellPosition;
|
|
}
|
|
|
|
ccl_device void voronoi_distance_to_edge_4d(float4 coord, float randomness, float *outDistance)
|
|
{
|
|
float4 cellPosition = floor(coord);
|
|
float4 localPosition = coord - cellPosition;
|
|
|
|
float4 vectorToClosest = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
float minDistance = 8.0f;
|
|
for (int u = -1; u <= 1; u++) {
|
|
for (int k = -1; k <= 1; k++) {
|
|
ccl_loop_no_unroll for (int j = -1; j <= 1; j++)
|
|
{
|
|
for (int i = -1; i <= 1; i++) {
|
|
float4 cellOffset = make_float4(i, j, k, u);
|
|
float4 vectorToPoint = cellOffset +
|
|
hash_float4_to_float4(cellPosition + cellOffset) * randomness -
|
|
localPosition;
|
|
float distanceToPoint = dot(vectorToPoint, vectorToPoint);
|
|
if (distanceToPoint < minDistance) {
|
|
minDistance = distanceToPoint;
|
|
vectorToClosest = vectorToPoint;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
minDistance = 8.0f;
|
|
for (int u = -1; u <= 1; u++) {
|
|
for (int k = -1; k <= 1; k++) {
|
|
ccl_loop_no_unroll for (int j = -1; j <= 1; j++)
|
|
{
|
|
for (int i = -1; i <= 1; i++) {
|
|
float4 cellOffset = make_float4(i, j, k, u);
|
|
float4 vectorToPoint = cellOffset +
|
|
hash_float4_to_float4(cellPosition + cellOffset) * randomness -
|
|
localPosition;
|
|
float4 perpendicularToEdge = vectorToPoint - vectorToClosest;
|
|
if (dot(perpendicularToEdge, perpendicularToEdge) > 0.0001f) {
|
|
float distanceToEdge = dot((vectorToClosest + vectorToPoint) / 2.0f,
|
|
normalize(perpendicularToEdge));
|
|
minDistance = min(minDistance, distanceToEdge);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outDistance = minDistance;
|
|
}
|
|
|
|
ccl_device void voronoi_n_sphere_radius_4d(float4 coord, float randomness, float *outRadius)
|
|
{
|
|
float4 cellPosition = floor(coord);
|
|
float4 localPosition = coord - cellPosition;
|
|
|
|
float4 closestPoint = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
float4 closestPointOffset = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
float minDistance = 8.0f;
|
|
for (int u = -1; u <= 1; u++) {
|
|
for (int k = -1; k <= 1; k++) {
|
|
ccl_loop_no_unroll for (int j = -1; j <= 1; j++)
|
|
{
|
|
for (int i = -1; i <= 1; i++) {
|
|
float4 cellOffset = make_float4(i, j, k, u);
|
|
float4 pointPosition = cellOffset +
|
|
hash_float4_to_float4(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = distance(pointPosition, localPosition);
|
|
if (distanceToPoint < minDistance) {
|
|
minDistance = distanceToPoint;
|
|
closestPoint = pointPosition;
|
|
closestPointOffset = cellOffset;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
minDistance = 8.0f;
|
|
float4 closestPointToClosestPoint = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
|
|
for (int u = -1; u <= 1; u++) {
|
|
for (int k = -1; k <= 1; k++) {
|
|
ccl_loop_no_unroll for (int j = -1; j <= 1; j++)
|
|
{
|
|
for (int i = -1; i <= 1; i++) {
|
|
if (i == 0 && j == 0 && k == 0 && u == 0) {
|
|
continue;
|
|
}
|
|
float4 cellOffset = make_float4(i, j, k, u) + closestPointOffset;
|
|
float4 pointPosition = cellOffset +
|
|
hash_float4_to_float4(cellPosition + cellOffset) * randomness;
|
|
float distanceToPoint = distance(closestPoint, pointPosition);
|
|
if (distanceToPoint < minDistance) {
|
|
minDistance = distanceToPoint;
|
|
closestPointToClosestPoint = pointPosition;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
*outRadius = distance(closestPointToClosestPoint, closestPoint) / 2.0f;
|
|
}
|
|
|
|
ccl_device void svm_node_tex_voronoi(KernelGlobals *kg,
|
|
ShaderData *sd,
|
|
float *stack,
|
|
uint dimensions,
|
|
uint feature,
|
|
uint metric,
|
|
int *offset)
|
|
{
|
|
uint4 stack_offsets = read_node(kg, offset);
|
|
uint4 defaults = read_node(kg, offset);
|
|
|
|
uint coord_stack_offset, w_stack_offset, scale_stack_offset, smoothness_stack_offset;
|
|
uint exponent_stack_offset, randomness_stack_offset, distance_out_stack_offset,
|
|
color_out_stack_offset;
|
|
uint position_out_stack_offset, w_out_stack_offset, radius_out_stack_offset;
|
|
|
|
svm_unpack_node_uchar4(stack_offsets.x,
|
|
&coord_stack_offset,
|
|
&w_stack_offset,
|
|
&scale_stack_offset,
|
|
&smoothness_stack_offset);
|
|
svm_unpack_node_uchar4(stack_offsets.y,
|
|
&exponent_stack_offset,
|
|
&randomness_stack_offset,
|
|
&distance_out_stack_offset,
|
|
&color_out_stack_offset);
|
|
svm_unpack_node_uchar3(
|
|
stack_offsets.z, &position_out_stack_offset, &w_out_stack_offset, &radius_out_stack_offset);
|
|
|
|
float3 coord = stack_load_float3(stack, coord_stack_offset);
|
|
float w = stack_load_float_default(stack, w_stack_offset, stack_offsets.w);
|
|
float scale = stack_load_float_default(stack, scale_stack_offset, defaults.x);
|
|
float smoothness = stack_load_float_default(stack, smoothness_stack_offset, defaults.y);
|
|
float exponent = stack_load_float_default(stack, exponent_stack_offset, defaults.z);
|
|
float randomness = stack_load_float_default(stack, randomness_stack_offset, defaults.w);
|
|
|
|
NodeVoronoiFeature voronoi_feature = (NodeVoronoiFeature)feature;
|
|
NodeVoronoiDistanceMetric voronoi_metric = (NodeVoronoiDistanceMetric)metric;
|
|
|
|
float distance_out = 0.0f, w_out = 0.0f, radius_out = 0.0f;
|
|
float3 color_out = make_float3(0.0f, 0.0f, 0.0f);
|
|
float3 position_out = make_float3(0.0f, 0.0f, 0.0f);
|
|
|
|
randomness = clamp(randomness, 0.0f, 1.0f);
|
|
smoothness = clamp(smoothness / 2.0f, 0.0f, 0.5f);
|
|
|
|
w *= scale;
|
|
coord *= scale;
|
|
|
|
switch (dimensions) {
|
|
case 1: {
|
|
switch (voronoi_feature) {
|
|
case NODE_VORONOI_F1:
|
|
voronoi_f1_1d(
|
|
w, exponent, randomness, voronoi_metric, &distance_out, &color_out, &w_out);
|
|
break;
|
|
case NODE_VORONOI_SMOOTH_F1:
|
|
voronoi_smooth_f1_1d(w,
|
|
smoothness,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&w_out);
|
|
break;
|
|
case NODE_VORONOI_F2:
|
|
voronoi_f2_1d(
|
|
w, exponent, randomness, voronoi_metric, &distance_out, &color_out, &w_out);
|
|
break;
|
|
case NODE_VORONOI_DISTANCE_TO_EDGE:
|
|
voronoi_distance_to_edge_1d(w, randomness, &distance_out);
|
|
break;
|
|
case NODE_VORONOI_N_SPHERE_RADIUS:
|
|
voronoi_n_sphere_radius_1d(w, randomness, &radius_out);
|
|
break;
|
|
default:
|
|
kernel_assert(0);
|
|
}
|
|
w_out = safe_divide(w_out, scale);
|
|
break;
|
|
}
|
|
case 2: {
|
|
float2 coord_2d = make_float2(coord.x, coord.y);
|
|
float2 position_out_2d;
|
|
switch (voronoi_feature) {
|
|
case NODE_VORONOI_F1:
|
|
voronoi_f1_2d(coord_2d,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out_2d);
|
|
break;
|
|
#if NODES_FEATURE(NODE_FEATURE_VORONOI_EXTRA)
|
|
case NODE_VORONOI_SMOOTH_F1:
|
|
voronoi_smooth_f1_2d(coord_2d,
|
|
smoothness,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out_2d);
|
|
break;
|
|
#endif
|
|
case NODE_VORONOI_F2:
|
|
voronoi_f2_2d(coord_2d,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out_2d);
|
|
break;
|
|
case NODE_VORONOI_DISTANCE_TO_EDGE:
|
|
voronoi_distance_to_edge_2d(coord_2d, randomness, &distance_out);
|
|
break;
|
|
case NODE_VORONOI_N_SPHERE_RADIUS:
|
|
voronoi_n_sphere_radius_2d(coord_2d, randomness, &radius_out);
|
|
break;
|
|
default:
|
|
kernel_assert(0);
|
|
}
|
|
position_out_2d = safe_divide_float2_float(position_out_2d, scale);
|
|
position_out = make_float3(position_out_2d.x, position_out_2d.y, 0.0f);
|
|
break;
|
|
}
|
|
case 3: {
|
|
switch (voronoi_feature) {
|
|
case NODE_VORONOI_F1:
|
|
voronoi_f1_3d(coord,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out);
|
|
break;
|
|
#if NODES_FEATURE(NODE_FEATURE_VORONOI_EXTRA)
|
|
case NODE_VORONOI_SMOOTH_F1:
|
|
voronoi_smooth_f1_3d(coord,
|
|
smoothness,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out);
|
|
break;
|
|
#endif
|
|
case NODE_VORONOI_F2:
|
|
voronoi_f2_3d(coord,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out);
|
|
break;
|
|
case NODE_VORONOI_DISTANCE_TO_EDGE:
|
|
voronoi_distance_to_edge_3d(coord, randomness, &distance_out);
|
|
break;
|
|
case NODE_VORONOI_N_SPHERE_RADIUS:
|
|
voronoi_n_sphere_radius_3d(coord, randomness, &radius_out);
|
|
break;
|
|
default:
|
|
kernel_assert(0);
|
|
}
|
|
position_out = safe_divide_float3_float(position_out, scale);
|
|
break;
|
|
}
|
|
|
|
#if NODES_FEATURE(NODE_FEATURE_VORONOI_EXTRA)
|
|
case 4: {
|
|
float4 coord_4d = make_float4(coord.x, coord.y, coord.z, w);
|
|
float4 position_out_4d;
|
|
switch (voronoi_feature) {
|
|
case NODE_VORONOI_F1:
|
|
voronoi_f1_4d(coord_4d,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out_4d);
|
|
break;
|
|
case NODE_VORONOI_SMOOTH_F1:
|
|
voronoi_smooth_f1_4d(coord_4d,
|
|
smoothness,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out_4d);
|
|
break;
|
|
case NODE_VORONOI_F2:
|
|
voronoi_f2_4d(coord_4d,
|
|
exponent,
|
|
randomness,
|
|
voronoi_metric,
|
|
&distance_out,
|
|
&color_out,
|
|
&position_out_4d);
|
|
break;
|
|
case NODE_VORONOI_DISTANCE_TO_EDGE:
|
|
voronoi_distance_to_edge_4d(coord_4d, randomness, &distance_out);
|
|
break;
|
|
case NODE_VORONOI_N_SPHERE_RADIUS:
|
|
voronoi_n_sphere_radius_4d(coord_4d, randomness, &radius_out);
|
|
break;
|
|
default:
|
|
kernel_assert(0);
|
|
}
|
|
position_out_4d = safe_divide_float4_float(position_out_4d, scale);
|
|
position_out = make_float3(position_out_4d.x, position_out_4d.y, position_out_4d.z);
|
|
w_out = position_out_4d.w;
|
|
break;
|
|
}
|
|
#endif
|
|
default:
|
|
kernel_assert(0);
|
|
}
|
|
|
|
if (stack_valid(distance_out_stack_offset))
|
|
stack_store_float(stack, distance_out_stack_offset, distance_out);
|
|
if (stack_valid(color_out_stack_offset))
|
|
stack_store_float3(stack, color_out_stack_offset, color_out);
|
|
if (stack_valid(position_out_stack_offset))
|
|
stack_store_float3(stack, position_out_stack_offset, position_out);
|
|
if (stack_valid(w_out_stack_offset))
|
|
stack_store_float(stack, w_out_stack_offset, w_out);
|
|
if (stack_valid(radius_out_stack_offset))
|
|
stack_store_float(stack, radius_out_stack_offset, radius_out);
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|