1 files changed, 91 insertions, 0 deletions
diff --git a/intern/cycles/kernel/svm/map_range.h b/intern/cycles/kernel/svm/map_range.h
new file mode 100644
index 00000000000..fdbfc6531c4
--- /dev/null
+++ b/intern/cycles/kernel/svm/map_range.h
@@ -0,0 +1,91 @@
+/*
+ * 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
+
+/* Map Range Node */
+
+ccl_device_inline float smootherstep(float edge0, float edge1, float x)
+{
+  x = clamp(safe_divide((x - edge0), (edge1 - edge0)), 0.0f, 1.0f);
+  return x * x * x * (x * (x * 6.0f - 15.0f) + 10.0f);
+}
+
+ccl_device_noinline int svm_node_map_range(KernelGlobals kg,
+                                           ccl_private ShaderData *sd,
+                                           ccl_private float *stack,
+                                           uint value_stack_offset,
+                                           uint parameters_stack_offsets,
+                                           uint results_stack_offsets,
+                                           int offset)
+{
+  uint from_min_stack_offset, from_max_stack_offset, to_min_stack_offset, to_max_stack_offset;
+  uint type_stack_offset, steps_stack_offset, result_stack_offset;
+  svm_unpack_node_uchar4(parameters_stack_offsets,
+                         &from_min_stack_offset,
+                         &from_max_stack_offset,
+                         &to_min_stack_offset,
+                         &to_max_stack_offset);
+  svm_unpack_node_uchar3(
+      results_stack_offsets, &type_stack_offset, &steps_stack_offset, &result_stack_offset);
+
+  uint4 defaults = read_node(kg, &offset);
+  uint4 defaults2 = read_node(kg, &offset);
+
+  float value = stack_load_float(stack, value_stack_offset);
+  float from_min = stack_load_float_default(stack, from_min_stack_offset, defaults.x);
+  float from_max = stack_load_float_default(stack, from_max_stack_offset, defaults.y);
+  float to_min = stack_load_float_default(stack, to_min_stack_offset, defaults.z);
+  float to_max = stack_load_float_default(stack, to_max_stack_offset, defaults.w);
+  float steps = stack_load_float_default(stack, steps_stack_offset, defaults2.x);
+
+  float result;
+
+  if (from_max != from_min) {
+    float factor = value;
+    switch (type_stack_offset) {
+      default:
+      case NODE_MAP_RANGE_LINEAR:
+        factor = (value - from_min) / (from_max - from_min);
+        break;
+      case NODE_MAP_RANGE_STEPPED: {
+        factor = (value - from_min) / (from_max - from_min);
+        factor = (steps > 0.0f) ? floorf(factor * (steps + 1.0f)) / steps : 0.0f;
+        break;
+      }
+      case NODE_MAP_RANGE_SMOOTHSTEP: {
+        factor = (from_min > from_max) ? 1.0f - smoothstep(from_max, from_min, factor) :
+                                         smoothstep(from_min, from_max, factor);
+        break;
+      }
+      case NODE_MAP_RANGE_SMOOTHERSTEP: {
+        factor = (from_min > from_max) ? 1.0f - smootherstep(from_max, from_min, factor) :
+                                         smootherstep(from_min, from_max, factor);
+        break;
+      }
+    }
+    result = to_min + factor * (to_max - to_min);
+  }
+  else {
+    result = 0.0f;
+  }
+  stack_store_float(stack, result_stack_offset, result);
+  return offset;
+}
+
+CCL_NAMESPACE_END