forked from bartvdbraak/blender
da376e0237
Cycles uses code from some great open source projects, many thanks them: * BVH building and traversal code from NVidia's "Understanding the Efficiency of Ray Traversal on GPUs": http://code.google.com/p/understanding-the-efficiency-of-ray-traversal-on-gpus/ * Open Shading Language for a large part of the shading system: http://code.google.com/p/openshadinglanguage/ * Blender for procedural textures and a few other nodes. * Approximate Catmull Clark subdivision from NVidia Mesh tools: http://code.google.com/p/nvidia-mesh-tools/ * Sobol direction vectors from: http://web.maths.unsw.edu.au/~fkuo/sobol/ * Film response functions from: http://www.cs.columbia.edu/CAVE/software/softlib/dorf.php
389 lines
7.8 KiB
Plaintext
389 lines
7.8 KiB
Plaintext
/*
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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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#include "stdosl.h"
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color rgb_to_hsv(color rgb)
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{
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float cmax, cmin, h, s, v, cdelta;
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color c;
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cmax = max(rgb[0], max(rgb[1], rgb[2]));
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cmin = min(rgb[0], min(rgb[1], rgb[2]));
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cdelta = cmax - cmin;
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v = cmax;
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if(cmax != 0.0) {
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s = cdelta/cmax;
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}
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else {
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s = 0.0;
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h = 0.0;
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}
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if(s == 0.0) {
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h = 0.0;
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}
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else {
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c = (color(cmax, cmax, cmax) - rgb)/cdelta;
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if(rgb[0] == cmax) h = c[2] - c[1];
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else if(rgb[1] == cmax) h = 2.0 + c[0] - c[2];
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else h = 4.0 + c[1] - c[0];
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h /= 6.0;
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if(h < 0.0)
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h += 1.0;
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}
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return color(h, s, v);
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}
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color hsv_to_rgb(color hsv)
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{
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float i, f, p, q, t, h, s, v;
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color rgb;
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h = hsv[0];
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s = hsv[1];
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v = hsv[2];
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if(s==0.0) {
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rgb = color(v, v, v);
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}
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else {
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if(h==1.0)
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h = 0.0;
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h *= 6.0;
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i = floor(h);
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f = h - i;
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rgb = color(f, f, f);
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p = v*(1.0-s);
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q = v*(1.0-(s*f));
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t = v*(1.0-(s*(1.0-f)));
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if(i == 0.0) rgb = color(v, t, p);
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else if(i == 1.0) rgb = color(q, v, p);
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else if(i == 2.0) rgb = color(p, v, t);
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else if(i == 3.0) rgb = color(p, q, v);
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else if(i == 4.0) rgb = color(t, p, v);
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else rgb = color(v, p, q);
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}
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return rgb;
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}
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color node_mix_blend(float t, color col1, color col2)
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{
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return mix(col1, col2, t);
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}
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color node_mix_add(float t, color col1, color col2)
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{
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return mix(col1, col1 + col2, t);
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}
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color node_mix_mul(float t, color col1, color col2)
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{
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return mix(col1, col1 * col2, t);
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}
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color node_mix_screen(float t, color col1, color col2)
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{
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float tm = 1.0 - t;
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return color(1.0) - (color(tm) + t*(color(1.0) - col2))*(color(1.0) - col1);
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}
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color node_mix_overlay(float t, color col1, color col2)
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{
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float tm = 1.0 - t;
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color outcol = col1;
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if(outcol[0] < 0.5)
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outcol[0] *= tm + 2.0*t*col2[0];
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else
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outcol[0] = 1.0 - (tm + 2.0*t*(1.0 - col2[0]))*(1.0 - outcol[0]);
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if(outcol[1] < 0.5)
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outcol[1] *= tm + 2.0*t*col2[1];
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else
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outcol[1] = 1.0 - (tm + 2.0*t*(1.0 - col2[1]))*(1.0 - outcol[1]);
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if(outcol[2] < 0.5)
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outcol[2] *= tm + 2.0*t*col2[2];
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else
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outcol[2] = 1.0 - (tm + 2.0*t*(1.0 - col2[2]))*(1.0 - outcol[2]);
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return outcol;
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}
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color node_mix_sub(float t, color col1, color col2)
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{
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return mix(col1, col1 - col2, t);
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}
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color node_mix_div(float t, color col1, color col2)
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{
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float tm = 1.0 - t;
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color outcol = col1;
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if(col2[0] != 0.0) outcol[0] = tm*outcol[0] + t*outcol[0]/col2[0];
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if(col2[1] != 0.0) outcol[1] = tm*outcol[1] + t*outcol[1]/col2[1];
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if(col2[2] != 0.0) outcol[2] = tm*outcol[2] + t*outcol[2]/col2[2];
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return outcol;
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}
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color node_mix_diff(float t, color col1, color col2)
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{
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return mix(col1, abs(col1 - col2), t);
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}
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color node_mix_dark(float t, color col1, color col2)
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{
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return min(col1, col2*t);
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}
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color node_mix_light(float t, color col1, color col2)
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{
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return max(col1, col2*t);
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}
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color node_mix_dodge(float t, color col1, color col2)
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{
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color outcol = col1;
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if(outcol[0] != 0.0) {
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float tmp = 1.0 - t*col2[0];
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if(tmp <= 0.0)
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outcol[0] = 1.0;
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else if((tmp = outcol[0]/tmp) > 1.0)
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outcol[0] = 1.0;
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else
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outcol[0] = tmp;
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}
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if(outcol[1] != 0.0) {
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float tmp = 1.0 - t*col2[1];
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if(tmp <= 0.0)
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outcol[1] = 1.0;
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else if((tmp = outcol[1]/tmp) > 1.0)
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outcol[1] = 1.0;
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else
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outcol[1] = tmp;
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}
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if(outcol[2] != 0.0) {
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float tmp = 1.0 - t*col2[2];
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if(tmp <= 0.0)
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outcol[2] = 1.0;
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else if((tmp = outcol[2]/tmp) > 1.0)
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outcol[2] = 1.0;
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else
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outcol[2] = tmp;
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}
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return outcol;
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}
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color node_mix_burn(float t, color col1, color col2)
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{
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float tmp, tm = 1.0 - t;
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color outcol = col1;
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tmp = tm + t*col2[0];
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if(tmp <= 0.0)
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outcol[0] = 0.0;
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else if((tmp = (1.0 - (1.0 - outcol[0])/tmp)) < 0.0)
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outcol[0] = 0.0;
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else if(tmp > 1.0)
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outcol[0] = 1.0;
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else
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outcol[0] = tmp;
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tmp = tm + t*col2[1];
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if(tmp <= 0.0)
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outcol[1] = 0.0;
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else if((tmp = (1.0 - (1.0 - outcol[1])/tmp)) < 0.0)
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outcol[1] = 0.0;
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else if(tmp > 1.0)
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outcol[1] = 1.0;
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else
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outcol[1] = tmp;
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tmp = tm + t*col2[2];
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if(tmp <= 0.0)
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outcol[2] = 0.0;
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else if((tmp = (1.0 - (1.0 - outcol[2])/tmp)) < 0.0)
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outcol[2] = 0.0;
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else if(tmp > 1.0)
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outcol[2] = 1.0;
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else
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outcol[2] = tmp;
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return outcol;
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}
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color node_mix_hue(float t, color col1, color col2)
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{
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color outcol = col1;
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color hsv2 = rgb_to_hsv(col2);
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if(hsv2[1] != 0.0) {
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color hsv = rgb_to_hsv(outcol);
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hsv[0] = hsv2[0];
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color tmp = hsv_to_rgb(hsv);
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outcol = mix(outcol, tmp, t);
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}
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return outcol;
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}
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color node_mix_sat(float t, color col1, color col2)
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{
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float tm = 1.0 - t;
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color outcol = col1;
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color hsv = rgb_to_hsv(outcol);
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if(hsv[1] != 0.0) {
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color hsv2 = rgb_to_hsv(col2);
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hsv[1] = tm*hsv[1] + t*hsv2[1];
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outcol = hsv_to_rgb(hsv);
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}
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return outcol;
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}
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color node_mix_val(float t, color col1, color col2)
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{
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float tm = 1.0 - t;
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color hsv = rgb_to_hsv(col1);
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color hsv2 = rgb_to_hsv(col2);
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hsv[2] = tm*hsv[2] + t*hsv2[2];
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return hsv_to_rgb(hsv);
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}
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color node_mix_color(float t, color col1, color col2)
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{
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color outcol = col1;
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color hsv2 = rgb_to_hsv(col2);
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if(hsv2[1] != 0.0) {
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color hsv = rgb_to_hsv(outcol);
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hsv[0] = hsv2[0];
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hsv[1] = hsv2[1];
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color tmp = hsv_to_rgb(hsv);
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outcol = mix(outcol, tmp, t);
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}
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return outcol;
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}
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color node_mix_soft(float t, color col1, color col2)
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{
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float tm = 1.0 - t;
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color one= color(1.0);
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color scr= one - (one - col2)*(one - col1);
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return tm*col1 + t*((one - col1)*col2*col1 + col1*scr);
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}
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color node_mix_linear(float t, color col1, color col2)
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{
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color outcol = col1;
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if(col2[0] > 0.5)
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outcol[0]= col1[0] + t*(2.0*(col2[0] - 0.5));
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else
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outcol[0]= col1[0] + t*(2.0*(col2[0]) - 1.0);
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if(col2[1] > 0.5)
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outcol[1]= col1[1] + t*(2.0*(col2[1] - 0.5));
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else
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outcol[1]= col1[1] + t*(2.0*(col2[1]) - 1.0);
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if(col2[2] > 0.5)
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outcol[2]= col1[2] + t*(2.0*(col2[2] - 0.5));
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else
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outcol[2]= col1[2] + t*(2.0*(col2[2]) - 1.0);
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return outcol;
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}
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shader node_mix(
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string type = "Mix",
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float Fac = 0.5,
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color Color1 = color(0.0, 0.0, 0.0),
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color Color2 = color(0.0, 0.0, 0.0),
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output color Color = color(0.0, 0.0, 0.0))
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{
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float t = clamp(Fac, 0.0, 1.0);
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if(type == "Mix")
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Color = node_mix_blend(t, Color1, Color2);
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if(type == "Add")
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Color = node_mix_add(t, Color1, Color2);
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if(type == "Multiply")
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Color = node_mix_mul(t, Color1, Color2);
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if(type == "Screen")
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Color = node_mix_screen(t, Color1, Color2);
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if(type == "Overlay")
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Color = node_mix_overlay(t, Color1, Color2);
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if(type == "Subtract")
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Color = node_mix_sub(t, Color1, Color2);
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if(type == "Divide")
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Color = node_mix_div(t, Color1, Color2);
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if(type == "Difference")
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Color = node_mix_diff(t, Color1, Color2);
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if(type == "Darken")
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Color = node_mix_dark(t, Color1, Color2);
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if(type == "Lighten")
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Color = node_mix_light(t, Color1, Color2);
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if(type == "Dodge")
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Color = node_mix_dodge(t, Color1, Color2);
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if(type == "Burn")
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Color = node_mix_burn(t, Color1, Color2);
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if(type == "Hue")
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Color = node_mix_hue(t, Color1, Color2);
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if(type == "Saturation")
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Color = node_mix_sat(t, Color1, Color2);
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if(type == "Value")
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Color = node_mix_val (t, Color1, Color2);
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if(type == "Color")
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Color = node_mix_color(t, Color1, Color2);
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if(type == "Soft Light")
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Color = node_mix_soft(t, Color1, Color2);
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if(type == "Linear Light")
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Color = node_mix_linear(t, Color1, Color2);
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}
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