1 files changed, 117 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/shaders/node_math.h b/intern/cycles/kernel/osl/shaders/node_math.h
new file mode 100644
index 00000000000..2da73b94212
--- /dev/null
+++ b/intern/cycles/kernel/osl/shaders/node_math.h
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2011-2020 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+float safe_divide(float a, float b)
+{
+  return (b != 0.0) ? a / b : 0.0;
+}
+
+vector safe_divide(vector a, vector b)
+{
+  return vector((b[0] != 0.0) ? a[0] / b[0] : 0.0,
+                (b[1] != 0.0) ? a[1] / b[1] : 0.0,
+                (b[2] != 0.0) ? a[2] / b[2] : 0.0);
+}
+
+float safe_modulo(float a, float b)
+{
+  return (b != 0.0) ? fmod(a, b) : 0.0;
+}
+
+float fract(float a)
+{
+  return a - floor(a);
+}
+
+/* See: https://www.iquilezles.org/www/articles/smin/smin.htm. */
+float smoothmin(float a, float b, float c)
+{
+  if (c != 0.0) {
+    float h = max(c - abs(a - b), 0.0) / c;
+    return min(a, b) - h * h * h * c * (1.0 / 6.0);
+  }
+  else {
+    return min(a, b);
+  }
+}
+
+float pingpong(float a, float b)
+{
+  return (b != 0.0) ? abs(fract((a - b) / (b * 2.0)) * b * 2.0 - b) : 0.0;
+}
+
+float safe_sqrt(float a)
+{
+  return (a > 0.0) ? sqrt(a) : 0.0;
+}
+
+float safe_log(float a, float b)
+{
+  return (a > 0.0 && b > 0.0) ? log(a) / log(b) : 0.0;
+}
+
+vector project(vector v, vector v_proj)
+{
+  float lenSquared = dot(v_proj, v_proj);
+  return (lenSquared != 0.0) ? (dot(v, v_proj) / lenSquared) * v_proj : vector(0.0);
+}
+
+vector snap(vector a, vector b)
+{
+  return floor(safe_divide(a, b)) * b;
+}
+
+/* Adapted from GODOT-engine math_funcs.h. */
+float wrap(float value, float max, float min)
+{
+  float range = max - min;
+  return (range != 0.0) ? value - (range * floor((value - min) / range)) : min;
+}
+
+point wrap(point value, point max, point min)
+{
+  return point(wrap(value[0], max[0], min[0]),
+               wrap(value[1], max[1], min[1]),
+               wrap(value[2], max[2], min[2]));
+}
+
+/* Built in OSL faceforward is `(dot(I, Nref) > 0) ? -N : N;` which is different to
+ * GLSL `dot(Nref, I) < 0 ? N : -N` for zero values. */
+point compatible_faceforward(point vec, point incident, point reference)
+{
+  return dot(reference, incident) < 0.0 ? vec : -vec;
+}
+
+matrix euler_to_mat(point euler)
+{
+  float cx = cos(euler[0]);
+  float cy = cos(euler[1]);
+  float cz = cos(euler[2]);
+  float sx = sin(euler[0]);
+  float sy = sin(euler[1]);
+  float sz = sin(euler[2]);
+  matrix mat = matrix(1.0);
+  mat[0][0] = cy * cz;
+  mat[0][1] = cy * sz;
+  mat[0][2] = -sy;
+  mat[1][0] = sy * sx * cz - cx * sz;
+  mat[1][1] = sy * sx * sz + cx * cz;
+  mat[1][2] = cy * sx;
+  +mat[2][0] = sy * cx * cz + sx * sz;
+  mat[2][1] = sy * cx * sz - sx * cz;
+  mat[2][2] = cy * cx;
+  return mat;
+}