forked from bartvdbraak/blender
260 lines
6.3 KiB
C
260 lines
6.3 KiB
C
/*
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* Copyright 2011, Blender Foundation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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CCL_NAMESPACE_BEGIN
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/* Voronoi Distances */
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__device float voronoi_distance(NodeDistanceMetric distance_metric, float3 d, float e)
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{
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if(distance_metric == NODE_VORONOI_DISTANCE_SQUARED)
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return dot(d, d);
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if(distance_metric == NODE_VORONOI_ACTUAL_DISTANCE)
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return len(d);
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if(distance_metric == NODE_VORONOI_MANHATTAN)
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return fabsf(d.x) + fabsf(d.y) + fabsf(d.z);
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if(distance_metric == NODE_VORONOI_CHEBYCHEV)
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return fmaxf(fabsf(d.x), fmaxf(fabsf(d.y), fabsf(d.z)));
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if(distance_metric == NODE_VORONOI_MINKOVSKY_H)
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return sqrtf(fabsf(d.x)) + sqrtf(fabsf(d.y)) + sqrtf(fabsf(d.y));
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if(distance_metric == NODE_VORONOI_MINKOVSKY_4)
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return sqrtf(sqrtf(dot(d*d, d*d)));
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if(distance_metric == NODE_VORONOI_MINKOVSKY)
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return powf(powf(fabsf(d.x), e) + powf(fabsf(d.y), e) + powf(fabsf(d.z), e), 1.0f/e);
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return 0.0f;
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}
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/* Voronoi / Worley like */
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__device_noinline void voronoi(float3 p, NodeDistanceMetric distance_metric, float e, float da[4], float3 pa[4])
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{
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/* returns distances in da and point coords in pa */
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int xx, yy, zz, xi, yi, zi;
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xi = (int)floorf(p.x);
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yi = (int)floorf(p.y);
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zi = (int)floorf(p.z);
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da[0] = 1e10f;
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da[1] = 1e10f;
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da[2] = 1e10f;
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da[3] = 1e10f;
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pa[0] = make_float3(0.0f, 0.0f, 0.0f);
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pa[1] = make_float3(0.0f, 0.0f, 0.0f);
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pa[2] = make_float3(0.0f, 0.0f, 0.0f);
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pa[3] = make_float3(0.0f, 0.0f, 0.0f);
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for(xx = xi-1; xx <= xi+1; xx++) {
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for(yy = yi-1; yy <= yi+1; yy++) {
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for(zz = zi-1; zz <= zi+1; zz++) {
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float3 ip = make_float3((float)xx, (float)yy, (float)zz);
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float3 vp = cellnoise_color(ip);
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float3 pd = p - (vp + ip);
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float d = voronoi_distance(distance_metric, pd, e);
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vp += ip;
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if(d < da[0]) {
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da[3] = da[2];
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da[2] = da[1];
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da[1] = da[0];
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da[0] = d;
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pa[3] = pa[2];
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pa[2] = pa[1];
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pa[1] = pa[0];
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pa[0] = vp;
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}
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else if(d < da[1]) {
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da[3] = da[2];
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da[2] = da[1];
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da[1] = d;
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pa[3] = pa[2];
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pa[2] = pa[1];
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pa[1] = vp;
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}
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else if(d < da[2]) {
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da[3] = da[2];
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da[2] = d;
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pa[3] = pa[2];
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pa[2] = vp;
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}
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else if(d < da[3]) {
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da[3] = d;
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pa[3] = vp;
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}
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}
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}
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}
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}
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__device float voronoi_Fn(float3 p, int n)
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{
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float da[4];
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float3 pa[4];
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voronoi(p, NODE_VORONOI_DISTANCE_SQUARED, 0, da, pa);
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return da[n];
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}
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__device float voronoi_FnFn(float3 p, int n1, int n2)
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{
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float da[4];
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float3 pa[4];
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voronoi(p, NODE_VORONOI_DISTANCE_SQUARED, 0, da, pa);
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return da[n2] - da[n1];
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}
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__device float voronoi_F1(float3 p) { return voronoi_Fn(p, 0); }
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__device float voronoi_F2(float3 p) { return voronoi_Fn(p, 1); }
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__device float voronoi_F3(float3 p) { return voronoi_Fn(p, 2); }
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__device float voronoi_F4(float3 p) { return voronoi_Fn(p, 3); }
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__device float voronoi_F1F2(float3 p) { return voronoi_FnFn(p, 0, 1); }
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__device float voronoi_Cr(float3 p)
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{
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/* crackle type pattern, just a scale/clamp of F2-F1 */
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float t = 10.0f*voronoi_F1F2(p);
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return (t > 1.0f)? 1.0f: t;
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}
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__device float voronoi_F1S(float3 p) { return 2.0f*voronoi_F1(p) - 1.0f; }
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__device float voronoi_F2S(float3 p) { return 2.0f*voronoi_F2(p) - 1.0f; }
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__device float voronoi_F3S(float3 p) { return 2.0f*voronoi_F3(p) - 1.0f; }
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__device float voronoi_F4S(float3 p) { return 2.0f*voronoi_F4(p) - 1.0f; }
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__device float voronoi_F1F2S(float3 p) { return 2.0f*voronoi_F1F2(p) - 1.0f; }
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__device float voronoi_CrS(float3 p) { return 2.0f*voronoi_Cr(p) - 1.0f; }
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/* Noise Bases */
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__device float noise_basis(float3 p, NodeNoiseBasis basis)
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{
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/* Only Perlin enabled for now, others break CUDA compile by making kernel
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* too big, with compile using > 4GB, due to everything being inlined. */
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#if 0
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if(basis == NODE_NOISE_PERLIN)
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#endif
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return noise(p);
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#if 0
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if(basis == NODE_NOISE_VORONOI_F1)
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return voronoi_F1S(p);
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if(basis == NODE_NOISE_VORONOI_F2)
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return voronoi_F2S(p);
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if(basis == NODE_NOISE_VORONOI_F3)
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return voronoi_F3S(p);
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if(basis == NODE_NOISE_VORONOI_F4)
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return voronoi_F4S(p);
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if(basis == NODE_NOISE_VORONOI_F2_F1)
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return voronoi_F1F2S(p);
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if(basis == NODE_NOISE_VORONOI_CRACKLE)
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return voronoi_CrS(p);
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if(basis == NODE_NOISE_CELL_NOISE)
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return cellnoise(p);
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return 0.0f;
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#endif
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}
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/* Soft/Hard Noise */
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__device float noise_basis_hard(float3 p, NodeNoiseBasis basis, int hard)
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{
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float t = noise_basis(p, basis);
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return (hard)? fabsf(2.0f*t - 1.0f): t;
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}
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/* Waves */
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__device float noise_wave(NodeWaveBasis wave, float a)
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{
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if(wave == NODE_WAVE_SINE) {
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return 0.5f + 0.5f * sinf(a);
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}
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else if(wave == NODE_WAVE_SAW) {
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float b = 2.0f*M_PI_F;
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int n = (int)(a / b);
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a -= n*b;
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if(a < 0.0f) a += b;
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return a / b;
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}
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else if(wave == NODE_WAVE_TRI) {
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float b = 2.0f*M_PI_F;
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float rmax = 1.0f;
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return rmax - 2.0f*fabsf(floorf((a*(1.0f/b))+0.5f) - (a*(1.0f/b)));
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}
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return 0.0f;
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}
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/* Turbulence */
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__device_noinline float noise_turbulence(float3 p, NodeNoiseBasis basis, float octaves, int hard)
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{
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float fscale = 1.0f;
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float amp = 1.0f;
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float sum = 0.0f;
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int i, n;
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octaves = clamp(octaves, 0.0f, 16.0f);
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n = (int)octaves;
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for(i = 0; i <= n; i++) {
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float t = noise_basis(fscale*p, basis);
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if(hard)
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t = fabsf(2.0f*t - 1.0f);
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sum += t*amp;
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amp *= 0.5f;
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fscale *= 2.0f;
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}
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float rmd = octaves - floorf(octaves);
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if(rmd != 0.0f) {
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float t = noise_basis(fscale*p, basis);
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if(hard)
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t = fabsf(2.0f*t - 1.0f);
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float sum2 = sum + t*amp;
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sum *= ((float)(1 << n)/(float)((1 << (n+1)) - 1));
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sum2 *= ((float)(1 << (n+1))/(float)((1 << (n+2)) - 1));
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return (1.0f - rmd)*sum + rmd*sum2;
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}
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else {
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sum *= ((float)(1 << n)/(float)((1 << (n+1)) - 1));
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return sum;
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}
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}
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CCL_NAMESPACE_END
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