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
85 lines
2.0 KiB
Plaintext
85 lines
2.0 KiB
Plaintext
/*
|
|
* Copyright 2011, Blender Foundation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "stdosl.h"
|
|
|
|
float safe_divide(float a, float b)
|
|
{
|
|
float result;
|
|
|
|
if(b == 0.0)
|
|
result = 0.0;
|
|
else
|
|
result = a/b;
|
|
|
|
return result;
|
|
}
|
|
|
|
float safe_log(float a, float b)
|
|
{
|
|
if(a < 0.0 || b < 0.0)
|
|
return 0.0;
|
|
|
|
return log(a)/log(b);
|
|
}
|
|
|
|
shader node_math(
|
|
string type = "Add",
|
|
float Value1 = 0.0,
|
|
float Value2 = 0.0,
|
|
output float Value = 0.0)
|
|
{
|
|
/* OSL asin, acos, pow check for values that could give rise to nan */
|
|
|
|
if(type == "Add")
|
|
Value = Value1 + Value2;
|
|
if(type == "Subtract")
|
|
Value = Value1 - Value2;
|
|
if(type == "Multiply")
|
|
Value = Value1*Value2;
|
|
if(type == "Divide")
|
|
Value = safe_divide(Value1, Value2);
|
|
if(type == "Sine")
|
|
Value = sin(Value1);
|
|
if(type == "Cosine")
|
|
Value = cos(Value1);
|
|
if(type == "Tangent")
|
|
Value = tan(Value1);
|
|
if(type == "Arcsine")
|
|
Value = asin(Value1);
|
|
if(type == "Arccosine")
|
|
Value = acos(Value1);
|
|
if(type == "Arctangent")
|
|
Value = atan(Value1);
|
|
if(type == "Power")
|
|
Value = pow(Value1, Value2);
|
|
if(type == "Logarithm")
|
|
Value = safe_log(Value1, Value2);
|
|
if(type == "Minimum")
|
|
Value = min(Value1, Value2);
|
|
if(type == "Maximum")
|
|
Value = max(Value1, Value2);
|
|
if(type == "Round")
|
|
Value = floor(Value1 + 0.5);
|
|
if(type == "Less Than")
|
|
Value = Value1 < Value2;
|
|
if(type == "Greater Than")
|
|
Value = Value1 > Value2;
|
|
}
|
|
|