1 files changed, 61 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/hsv.h b/intern/cycles/kernel/svm/hsv.h
new file mode 100644
index 00000000000..fdb266883fa
--- /dev/null
+++ b/intern/cycles/kernel/svm/hsv.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright 2011-2013 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.
+ */
+
+#pragma once
+
+CCL_NAMESPACE_BEGIN
+
+ccl_device_noinline void svm_node_hsv(KernelGlobals kg,
+                                      ccl_private ShaderData *sd,
+                                      ccl_private float *stack,
+                                      uint4 node)
+{
+  uint in_color_offset, fac_offset, out_color_offset;
+  uint hue_offset, sat_offset, val_offset;
+  svm_unpack_node_uchar3(node.y, &in_color_offset, &fac_offset, &out_color_offset);
+  svm_unpack_node_uchar3(node.z, &hue_offset, &sat_offset, &val_offset);
+
+  float fac = stack_load_float(stack, fac_offset);
+  float3 in_color = stack_load_float3(stack, in_color_offset);
+  float3 color = in_color;
+
+  float hue = stack_load_float(stack, hue_offset);
+  float sat = stack_load_float(stack, sat_offset);
+  float val = stack_load_float(stack, val_offset);
+
+  color = rgb_to_hsv(color);
+
+  /* Remember: `fmodf` doesn't work for negative numbers here. */
+  color.x = fmodf(color.x + hue + 0.5f, 1.0f);
+  color.y = saturatef(color.y * sat);
+  color.z *= val;
+
+  color = hsv_to_rgb(color);
+
+  color.x = fac * color.x + (1.0f - fac) * in_color.x;
+  color.y = fac * color.y + (1.0f - fac) * in_color.y;
+  color.z = fac * color.z + (1.0f - fac) * in_color.z;
+
+  /* Clamp color to prevent negative values caused by over saturation. */
+  color.x = max(color.x, 0.0f);
+  color.y = max(color.y, 0.0f);
+  color.z = max(color.z, 0.0f);
+
+  if (stack_valid(out_color_offset))
+    stack_store_float3(stack, out_color_offset, color);
+}
+
+CCL_NAMESPACE_END