Shader Nodes: Add Interpolation modes to Map Range node

Modes: Linear interpolation (default), stepped linear, smoothstep and smootherstep.

This also includes an additional option for the **Clamp node** to switch between **Min Max** (default) and **Range** mode.

This was needed to allow clamping when **To Max** is less than **To Min**.

Reviewed By: JacquesLucke, brecht

Differential Revision: https://developer.blender.org/D5827

1 files changed, 5 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl b/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl
index b8842064b6f..b196aed690f 100644
--- a/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl
+++ b/source/blender/gpu/shaders/material/gpu_shader_material_clamp.glsl
@@ -2,3 +2,8 @@ void clamp_value(float value, float min, float max, out float result)
 {
   result = clamp(value, min, max);
 }
+
+void clamp_range(float value, float min, float max, out float result)
+{
+  result = (max > min) ? clamp(value, min, max) : clamp(value, max, min);
+}