Nodes: Add Float Curve for GN and Shader nodes.

Replacement for float curve in legacy Attribute Curve Map node.

Float Curve defaults to [0.0-1.0] range.

Reviewed By: JacquesLucke, brecht

Differential Revision: https://developer.blender.org/D12683

2 files changed, 33 insertions, 0 deletions

diff --git a/intern/cycles/kernel/shaders/CMakeLists.txt b/intern/cycles/kernel/shaders/CMakeLists.txt
index 02be7813369..6b62e7bb52f 100644
--- a/intern/cycles/kernel/shaders/CMakeLists.txt
+++ b/intern/cycles/kernel/shaders/CMakeLists.txt
@@ -41,6 +41,7 @@ set(SRC_OSL
   node_vector_displacement.osl
   node_emission.osl
   node_environment_texture.osl
+  node_float_curve.osl
   node_fresnel.osl
   node_gamma.osl
   node_geometry.osl
diff --git a/intern/cycles/kernel/shaders/node_float_curve.osl b/intern/cycles/kernel/shaders/node_float_curve.osl
new file mode 100644
index 00000000000..f1f05fd88a9
--- /dev/null
+++ b/intern/cycles/kernel/shaders/node_float_curve.osl
@@ -0,0 +1,32 @@
+/*
+ * Copyright 2011-2021 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.
+ */
+
+#include "node_ramp_util.h"
+#include "stdcycles.h"
+
+shader node_float_curve(float ramp[] = {0.0},
+                        float min_x = 0.0,
+                        float max_x = 1.0,
+                        float ValueIn = 0.0,
+                        float Factor = 0.0,
+                        output float ValueOut = 0.0)
+{
+  float c = (ValueIn - min_x) / (max_x - min_x);
+
+  ValueOut = rgb_ramp_lookup(ramp, c, 1, 1);
+
+  ValueOut = mix(ValueIn, ValueOut, Factor);
+}