source/blender/nodes/shader/CMakeLists.txt

@@ -147,6 +147,7 @@ set(LIB
 if(WITH_MATERIALX)
   list(APPEND SRC
     materialx/material.cc
+    materialx/nodes/brightness.cc
     materialx/nodes/bsdf_principled.cc
     materialx/nodes/huesatval.cc
     materialx/nodes/invert.cc

source/blender/nodes/shader/materialx/nodes/brightness.cc

@@ -0,0 +1,18 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "node_parser.h"
+
+namespace blender::nodes::materialx {
+
+NodeItem BrightContrastNodeParser::compute()
+{
+  NodeItem color = get_input_value("Color");
+  NodeItem bright = get_input_value("Bright");
+  NodeItem contrast = get_input_value("Contrast");
+
+  return (bright + color * (contrast + value(1.0f)) - contrast * value(0.5f)).max(value(0.0f));
+}
+
+}  // namespace blender::nodes::materialx

source/blender/nodes/shader/materialx/nodes/node_parser.cc

@@ -132,6 +132,7 @@ NodeItem NodeParser::get_input_link(const bNodeSocket &socket)
     break;
 
   switch (from_node->typeinfo->type) {
+    CASE_NODE_TYPE(SH_NODE_BRIGHTCONTRAST, BrightContrastNodeParser)
     CASE_NODE_TYPE(SH_NODE_BSDF_PRINCIPLED, BSDFPrincipledNodeParser)
     CASE_NODE_TYPE(SH_NODE_COMBINE_COLOR, CombineColorNodeParser)
     CASE_NODE_TYPE(SH_NODE_COMBXYZ, CombineXYZNodeParser)

source/blender/nodes/shader/materialx/nodes/node_parser.h

@@ -61,6 +61,7 @@ template<class T> NodeItem NodeParser::value(const T &data) const
     NodeItem compute() override; \
   };
 
+DECLARE_PARSER(BrightContrastNodeParser)
 DECLARE_PARSER(BSDFPrincipledNodeParser)
 DECLARE_PARSER(CombineColorNodeParser)
 DECLARE_PARSER(CombineXYZNodeParser)