source/blender/nodes/shader/CMakeLists.txt

@@ -152,11 +152,13 @@ if(WITH_MATERIALX)
     materialx/nodes/invert.cc
     materialx/nodes/math.cc
     materialx/nodes/mix_rgb.cc
+    materialx/nodes/node_item.cc
     materialx/nodes/node_parser.cc
     materialx/nodes/output_material.cc
     materialx/nodes/tex_image.cc
 
     materialx/material.h
+    materialx/nodes/node_item.h
     materialx/nodes/node_parser.h
   )
 endif()

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

@@ -8,31 +8,16 @@ namespace blender::nodes::materialx {
 
 NodeItem BSDFPrincipledNodeParser::compute()
 {
-  auto enabled = [](NodeItem &val) -> bool {
+  NodeItem zero = value(0.0f);
-    if (val.node) {
-      return true;
-    }
-    if (!val.value) {
-      return false;
-    }
-    if (val.value->isA<float>()) {
-      return val.value->asA<float>() != 0.0f;
-    }
-    if (val.value->isA<MaterialX::Color4>()) {
-      auto c = val.value->asA<MaterialX::Color4>();
-      return c[0] != 0.0f || c[1] != 0.0f || c[2] != 0.0f;
-    }
-    return true;
-  };
 
   /* Getting required inputs
    * Note: if some inputs are not needed they won't be taken */
   NodeItem base_color = get_input_value("Base Color");
 
   NodeItem subsurface = get_input_value("Subsurface");
-  NodeItem subsurface_radius = empty_value();
+  NodeItem subsurface_radius = empty();
-  NodeItem subsurface_color = empty_value();
+  NodeItem subsurface_color = empty();
-  if (enabled(subsurface)) {
+  if (subsurface != zero) {
     subsurface_radius = get_input_value("Subsurface Radius");
     subsurface_color = get_input_value("Subsurface Color");
   }
@@ -42,33 +27,33 @@ NodeItem BSDFPrincipledNodeParser::compute()
   // NodeItem specular_tint = get_input_value("Specular Tint");
   NodeItem roughness = get_input_value("Roughness");
 
-  NodeItem anisotropic = empty_value();
+  NodeItem anisotropic = empty();
-  NodeItem anisotropic_rotation = empty_value();
+  NodeItem anisotropic_rotation = empty();
-  if (enabled(metallic)) {
+  if (metallic != zero) {
     /* TODO: use Specular Tint input */
     anisotropic = get_input_value("Anisotropic");
-    if (enabled(anisotropic)) {
+    if (anisotropic != zero) {
       anisotropic_rotation = get_input_value("Anisotropic Rotation");
       // anisotropic_rotation = 0.5 - (anisotropic_rotation % 1.0)
     }
   }
 
   NodeItem sheen = get_input_value("Sheen");
-  // sheen_tint = empty_value();
+  // sheen_tint = empty();
   // if enabled(sheen):
   //     sheen_tint = get_input_value("Sheen Tint");
 
   NodeItem clearcoat = get_input_value("Clearcoat");
-  NodeItem clearcoat_roughness = empty_value();
+  NodeItem clearcoat_roughness = empty();
-  if (enabled(clearcoat)) {
+  if (clearcoat != zero) {
     clearcoat_roughness = get_input_value("Clearcoat Roughness");
   }
 
   NodeItem ior = get_input_value("IOR");
 
   NodeItem transmission = get_input_value("Transmission");
-  NodeItem transmission_roughness = empty_value();
+  NodeItem transmission_roughness = empty();
-  if (enabled(transmission)) {
+  if (transmission != zero) {
     transmission_roughness = get_input_value("Transmission Roughness");
   }
 
@@ -90,11 +75,11 @@ NodeItem BSDFPrincipledNodeParser::compute()
   res.set_input("normal", normal);
   res.set_input("tangent", tangent);
 
-  if (enabled(metallic)) {
+  if (metallic != zero) {
     res.set_input("metalness", metallic);
   }
 
-  if (enabled(specular)) {
+  if (specular != zero) {
     res.set_input("specular", specular);
     res.set_input("specular_color", base_color.to_color3());
     res.set_input("specular_roughness", roughness);
@@ -103,26 +88,26 @@ NodeItem BSDFPrincipledNodeParser::compute()
     res.set_input("specular_rotation", anisotropic_rotation);
   }
 
-  if (enabled(transmission)) {
+  if (transmission != zero) {
     res.set_input("transmission", transmission);
     res.set_input("transmission_color", base_color.to_color3());
     res.set_input("transmission_extra_roughness", transmission_roughness);
   }
 
-  if (enabled(subsurface)) {
+  if (subsurface != zero) {
     res.set_input("subsurface", subsurface);
     res.set_input("subsurface_color", subsurface_color);
     res.set_input("subsurface_radius", subsurface_radius);
     res.set_input("subsurface_anisotropy", anisotropic);
   }
 
-  if (enabled(sheen)) {
+  if (sheen != zero) {
     res.set_input("sheen", sheen);
     res.set_input("sheen_color", base_color.to_color3());
     res.set_input("sheen_roughness", roughness);
   }
 
-  if (enabled(clearcoat)) {
+  if (clearcoat != zero) {
     res.set_input("coat", clearcoat);
     res.set_input("coat_color", base_color.to_color3());
     res.set_input("coat_roughness", clearcoat_roughness);
@@ -132,7 +117,7 @@ NodeItem BSDFPrincipledNodeParser::compute()
     res.set_input("coat_normal", clearcoat_normal);
   }
 
-  if (enabled(emission)) {
+  if (emission != zero) {
     res.set_input("emission", emission_strength);
     res.set_input("emission_color", emission);
   }

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

@@ -8,8 +8,164 @@ namespace blender::nodes::materialx {
 
 NodeItem MathNodeParser::compute()
 {
-  /* TODO: implement */
+  /* TODO: finish some math operations */
-  return empty_value();
+
+  auto op = node->custom1;
+  printf("%d\n", int(op));
+
+  NodeItem res = empty();
+
+  /* Single operand operations */
+  NodeItem x = get_input_value(0);
+  switch (op) {
+    case NODE_MATH_SINE:
+      res = x.sin();
+      break;
+    case NODE_MATH_COSINE:
+      res = x.cos();
+      break;
+    case NODE_MATH_TANGENT:
+      res = x.tan();
+      break;
+    case NODE_MATH_ARCSINE:
+      res = x.asin();
+      break;
+    case NODE_MATH_ARCCOSINE:
+      res = x.acos();
+      break;
+    case NODE_MATH_ARCTANGENT:
+      res = x.atan();
+      break;
+    case NODE_MATH_ROUND:
+      res = (x + value(0.5f)).floor();
+      break;
+    case NODE_MATH_ABSOLUTE:
+      res = x.abs();
+      break;
+    case NODE_MATH_FLOOR:
+      res = x.floor();
+      break;
+    case NODE_MATH_CEIL:
+      res = x.ceil();
+      break;
+    case NODE_MATH_FRACTION:
+      res = x % value(1.0f);
+      break;
+    case NODE_MATH_SQRT:
+      res = x.sqrt();
+      break;
+    case NODE_MATH_INV_SQRT:
+      res = value(1.0f) / x.sqrt();
+      break;
+    case NODE_MATH_SIGN:
+      res = x.sign();
+      break;
+    case NODE_MATH_EXPONENT:
+      res = x.exp();
+      break;
+    case NODE_MATH_RADIANS:
+      res = x * value(float(M_PI) / 180.0f);
+      break;
+    case NODE_MATH_DEGREES:
+      res = x * value(180.0f * float(M_1_PI));
+      break;
+    case NODE_MATH_SINH:
+      res = x.sinh();
+      break;
+    case NODE_MATH_COSH:
+      res = x.cosh();
+      break;
+    case NODE_MATH_TANH:
+      res = x.tanh();
+      break;
+    case NODE_MATH_TRUNC:
+      res = x.sign() * x.abs().floor();
+      break;
+
+    default: {
+      /* 2-operand operations */
+      NodeItem y = get_input_value(1);
+      switch (op) {
+        case NODE_MATH_ADD:
+          res = x + y;
+          break;
+        case NODE_MATH_SUBTRACT:
+          res = x - y;
+          break;
+        case NODE_MATH_MULTIPLY:
+          res = x * y;
+          break;
+        case NODE_MATH_DIVIDE:
+          res = x / y;
+          break;
+        case NODE_MATH_POWER:
+          res = x ^ y;
+          break;
+        case NODE_MATH_LOGARITHM:
+          res = x.ln() / y.ln();
+          break;
+        case NODE_MATH_MINIMUM:
+          res = x.min(y);
+          break;
+        case NODE_MATH_MAXIMUM:
+          res = x.max(y);
+          break;
+        case NODE_MATH_LESS_THAN:
+          res = x.if_else("<", y, value(1.0f), value(0.0f));
+          break;
+        case NODE_MATH_GREATER_THAN:
+          res = x.if_else(">", y, value(1.0f), value(0.0f));
+          break;
+        case NODE_MATH_MODULO:
+          res = x % y;
+          break;
+        case NODE_MATH_ARCTAN2:
+          res = x.atan2(y);
+          break;
+        case NODE_MATH_SNAP:
+          // res = ;
+          break;
+        case NODE_MATH_PINGPONG:
+          // res = ;
+          break;
+        case NODE_MATH_FLOORED_MODULO:
+          // res = ;
+          break;
+
+        default: {
+          /* 3-operand operations */
+          NodeItem z = get_input_value(2);
+          switch (op) {
+            case NODE_MATH_WRAP:
+              // res = ;
+              break;
+            case NODE_MATH_COMPARE:
+              res = z.if_else("<", (x - y).abs(), value(1.0f), value(0.0f));
+              break;
+            case NODE_MATH_MULTIPLY_ADD:
+              res = x * y + z;
+              break;
+            case NODE_MATH_SMOOTH_MIN:
+              // res = ;
+              break;
+            case NODE_MATH_SMOOTH_MAX:
+              // res = ;
+              break;
+
+            default:
+              BLI_assert_unreachable();
+          }
+        }
+      }
+    }
+  }
+
+  bool clamp_output = node->custom2 != 0;
+  if (clamp_output && res) {
+    res = res.clamp();
+  }
+
+  return res;
 }
 
 }  // namespace blender::nodes::materialx

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

@@ -9,7 +9,7 @@ namespace blender::nodes::materialx {
 NodeItem MixRGBNodeParser::compute()
 {
   /* TODO: implement */
-  return empty_value();
+  return empty();
 }
 
 }  // namespace blender::nodes::materialx

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

@@ -0,0 +1,599 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include "node_item.h"
+
+#include "BLI_assert.h"
+#include "BLI_utildefines.h"
+
+namespace blender::nodes::materialx {
+
+NodeItem::NodeItem(MaterialX::GraphElement *graph) : graph_(graph) {}
+
+NodeItem NodeItem::empty() const
+{
+  return NodeItem(graph_);
+}
+
+void NodeItem::set_input(const std::string &name, const NodeItem &item)
+{
+  if (item.value) {
+    set_input(name, item.value);
+  }
+  else if (item.node) {
+    set_input(name, item.node);
+  }
+}
+
+void NodeItem::set_input(const std::string &name, const MaterialX::ValuePtr value)
+{
+  std::string mx_type = value->getTypeString();
+  if (mx_type == "float") {
+    set_input(name, value->asA<float>(), mx_type);
+  }
+  else if (mx_type == "integer") {
+    set_input(name, value->asA<int>(), mx_type);
+  }
+  else if (mx_type == "vector2") {
+    set_input(name, value->asA<MaterialX::Vector2>(), mx_type);
+  }
+  else if (mx_type == "vector3") {
+    set_input(name, value->asA<MaterialX::Vector3>(), mx_type);
+  }
+  else if (mx_type == "vector4") {
+    set_input(name, value->asA<MaterialX::Vector4>(), mx_type);
+  }
+  else if (mx_type == "color3") {
+    set_input(name, value->asA<MaterialX::Color3>(), mx_type);
+  }
+  else if (mx_type == "color4") {
+    set_input(name, value->asA<MaterialX::Color4>(), mx_type);
+  }
+  else if (mx_type == "string") {
+    set_input(name, value->asA<std::string>(), mx_type);
+  }
+  else {
+    BLI_assert_unreachable();
+  }
+}
+
+void NodeItem::set_input(const std::string &name, const MaterialX::NodePtr node)
+{
+  this->node->setConnectedNode(name, node);
+}
+
+NodeItem::operator bool() const
+{
+  return value || node;
+}
+
+NodeItem NodeItem::operator+(const NodeItem &other) const
+{
+  return arithmetic(other, "add", [](float a, float b) { return a + b; });
+}
+
+NodeItem NodeItem::operator-(const NodeItem &other) const
+{
+  return arithmetic(other, "subtract", [](float a, float b) { return a - b; });
+}
+
+NodeItem NodeItem::operator-() const
+{
+  return val(0.0f) - *this;
+}
+
+NodeItem NodeItem::operator*(const NodeItem &other) const
+{
+  return arithmetic(other, "multiply", [](float a, float b) { return a * b; });
+}
+
+NodeItem NodeItem::operator/(const NodeItem &other) const
+{
+  return arithmetic(other, "divide", [](float a, float b) { return b == 0.0f ? 0.0f : a / b; });
+}
+
+NodeItem NodeItem::operator%(const NodeItem &other) const
+{
+  return arithmetic(
+      other, "modulo", [](float a, float b) { return b == 0.0f ? 0.0f : std::fmodf(a, b); });
+}
+
+NodeItem NodeItem::operator^(const NodeItem &other) const
+{
+  return arithmetic(other, "power", [](float a, float b) { return std::powf(a, b); });
+}
+
+bool NodeItem::operator==(const NodeItem &other) const
+{
+  if (!*this) {
+    return !other;
+  }
+  if (!other) {
+    return !*this;
+  }
+  if (node && node == other.node) {
+    return true;
+  }
+  if ((node && other.value) || (value && other.node)) {
+    return false;
+  }
+
+  std::string mx_type;
+  auto val1 = value;
+  auto val2 = other.value;
+  if (!adjust_types(val1, val2, mx_type)) {
+    return false;
+  }
+  if (mx_type == "float") {
+    return val1->asA<float>() == val2->asA<float>();
+  }
+  if (mx_type == "color3") {
+    return val1->asA<MaterialX::Color3>() == val2->asA<MaterialX::Color3>();
+  }
+  if (mx_type == "color4") {
+    return val1->asA<MaterialX::Color4>() == val2->asA<MaterialX::Color4>();
+  }
+  if (mx_type == "vector2") {
+    return val1->asA<MaterialX::Vector2>() == val2->asA<MaterialX::Vector2>();
+  }
+  if (mx_type == "vector3") {
+    return val1->asA<MaterialX::Vector3>() == val2->asA<MaterialX::Vector3>();
+  }
+  if (mx_type == "vector4") {
+    return val1->asA<MaterialX::Vector4>() == val2->asA<MaterialX::Vector4>();
+  }
+
+  return false;
+}
+
+bool NodeItem::operator!=(const NodeItem &other) const
+{
+  return !(*this == other);
+}
+
+NodeItem NodeItem::abs() const
+{
+  return arithmetic("absval", [](float a) { return std::fabsf(a); });
+}
+
+NodeItem NodeItem::floor() const
+{
+  return arithmetic("floor", [](float a) { return std::floorf(a); });
+}
+
+NodeItem NodeItem::ceil() const
+{
+  return arithmetic("ceil", [](float a) { return std::ceilf(a); });
+}
+
+NodeItem NodeItem::min(const NodeItem &other) const
+{
+  return arithmetic(other, "min", [](float a, float b) { return std::min(a, b); });
+}
+
+NodeItem NodeItem::max(const NodeItem &other) const
+{
+  return arithmetic(other, "max", [](float a, float b) { return std::max(a, b); });
+}
+
+NodeItem NodeItem::dotproduct(const NodeItem &other) const
+{
+  NodeItem d = arithmetic(other, "dotproduct", [](float a, float b) { return a * b; });
+  if (d.value) {
+    std::string mx_type = d.type();
+    float f = 0.0f;
+    if (mx_type == "float") {
+      f = value->asA<float>();
+    }
+    else if (mx_type == "color3") {
+      auto v = value->asA<MaterialX::Color3>();
+      f = v[0] + v[1] + v[2];
+    }
+    else if (mx_type == "color4") {
+      auto v = value->asA<MaterialX::Color4>();
+      f = v[0] + v[1] + v[2] + v[3];
+    }
+    else if (mx_type == "vector2") {
+      auto v = value->asA<MaterialX::Vector2>();
+      f = v[0] + v[1];
+    }
+    else if (mx_type == "vector3") {
+      auto v = value->asA<MaterialX::Vector3>();
+      f = v[0] + v[1] + v[2];
+    }
+    else if (mx_type == "vector4") {
+      auto v = value->asA<MaterialX::Vector4>();
+      f = v[0] + v[1] + v[2] + v[3];
+    }
+    d.value = MaterialX::Value::createValue(f);
+  }
+  return d;
+}
+
+NodeItem NodeItem::if_else(const std::string &condition,
+                           const NodeItem &other,
+                           const NodeItem &if_val,
+                           const NodeItem &else_val) const
+{
+  if (condition == "<") {
+    return other.if_else(">", *this, else_val, if_val);
+  }
+  if (condition == "<=") {
+    return other.if_else(">=", *this, else_val, if_val);
+  }
+  if (condition == "!=") {
+    return if_else("==", other, else_val, if_val);
+  }
+
+  NodeItem res = empty();
+  if (type() != "float" || other.type() != "float") {
+    return res;
+  }
+
+  auto val1 = if_val;
+  auto val2 = else_val;
+  std::string mx_type;
+  if (!adjust_types(val1, val2, mx_type)) {
+    return res;
+  }
+
+  std::function<bool(float, float)> func = nullptr;
+  std::string mx_category;
+  if (condition == ">") {
+    mx_category = "ifgreater";
+    func = [](float a, float b) { return a > b; };
+  }
+  else if (condition == ">=") {
+    mx_category = "ifgreatereq";
+    func = [](float a, float b) { return a >= b; };
+  }
+  else if (condition == "==") {
+    mx_category = "ifequal";
+    func = [](float a, float b) { return a == b; };
+  }
+  else {
+    BLI_assert_unreachable();
+  }
+
+  if (value && other.value) {
+    res = func(value->asA<float>(), other.value->asA<float>()) ? val1 : val2;
+  }
+  else {
+    res.node = graph_->addNode(mx_category, MaterialX::EMPTY_STRING, mx_type);
+    res.set_input("value1", *this);
+    res.set_input("value2", other);
+    res.set_input("in1", val1);
+    res.set_input("in2", val2);
+  }
+
+  return res;
+}
+
+NodeItem NodeItem::blend(const NodeItem &a, const NodeItem &b) const
+{
+  return (val(1.0f) - *this) * a + *this * b;
+}
+
+NodeItem NodeItem::clamp(const NodeItem &min_val, const NodeItem &max_val) const
+{
+  return min(max_val).max(min_val);
+}
+
+NodeItem NodeItem::clamp(float min_val, float max_val) const
+{
+  return clamp(val(min_val), val(max_val));
+}
+
+NodeItem NodeItem::sin() const
+{
+  return arithmetic("sin", [](float a) { return std::sinf(a); });
+}
+
+NodeItem NodeItem::cos() const
+{
+  return arithmetic("cos", [](float a) { return std::cosf(a); });
+}
+
+NodeItem NodeItem::tan() const
+{
+  return arithmetic("tan", [](float a) { return std::tanf(a); });
+}
+
+NodeItem NodeItem::asin() const
+{
+  return arithmetic("asin", [](float a) { return std::asinf(a); });
+}
+
+NodeItem NodeItem::acos() const
+{
+  return arithmetic("acos", [](float a) { return std::acosf(a); });
+}
+
+NodeItem NodeItem::atan() const
+{
+  return arithmetic("atan", [](float a) { return std::atanf(a); });
+}
+
+NodeItem NodeItem::atan2(const NodeItem &other) const
+{
+  return arithmetic(other, "atan2", [](float a, float b) { return std::atan2f(a, b); });
+}
+
+NodeItem NodeItem::sinh() const
+{
+  return (exp() - (-*this).exp()) / val(2.0f);
+}
+
+NodeItem NodeItem::cosh() const
+{
+  return (exp() - (-*this).exp()) / val(2.0f);
+}
+
+NodeItem NodeItem::tanh() const
+{
+  return sinh() / cosh();
+}
+
+NodeItem NodeItem::ln() const
+{
+  return arithmetic("ln", [](float a) { return std::logf(a); });
+}
+
+NodeItem NodeItem::sqrt() const
+{
+  return arithmetic("sqrt", [](float a) { return std::sqrtf(a); });
+}
+
+NodeItem NodeItem::sign() const
+{
+  return arithmetic("sign", [](float a) { return a < 0.0f ? -1.0f : (a == 0.0f ? 0.0f : 1.0f); });
+}
+
+NodeItem NodeItem::exp() const
+{
+  return arithmetic("exp", [](float a) { return std::expf(a); });
+}
+
+NodeItem NodeItem::to_color3() const
+{
+  std::string t = type();
+  NodeItem res = empty();
+  if (value) {
+    MaterialX::Color3 c;
+    if (t == "float") {
+      float v = value->asA<float>();
+      c = {v, v, v};
+    }
+    else if (t == "color3") {
+      auto v = value->asA<MaterialX::Color3>();
+      c = {v[0], v[1], v[2]};
+    }
+    else if (t == "color4") {
+      auto v = value->asA<MaterialX::Color4>();
+      c = {v[0], v[1], v[2]};
+    }
+    else if (t == "vector3") {
+      auto v = value->asA<MaterialX::Vector3>();
+      c = {v[0], v[1], v[2]};
+    }
+    else if (t == "vector4") {
+      auto v = value->asA<MaterialX::Vector4>();
+      c = {v[0], v[1], v[2]};
+    }
+    else {
+      return res;
+    }
+    res.value = MaterialX::Value::createValue<MaterialX::Color3>(c);
+  }
+  else if (node) {
+    if (t != "color3") {
+      return res;
+    }
+    res.node = node;
+  }
+  return res;
+}
+
+bool NodeItem::is_numeric() const
+{
+  std::string t = type();
+  return ELEM(t, "float", "color3", "color4", "vector2", "vector3", "vector4");
+}
+
+std::string NodeItem::type() const
+{
+  return value ? value->getTypeString() : node->getType();
+}
+
+NodeItem NodeItem::arithmetic(const std::string &mx_category,
+                              std::function<float(float)> func) const
+{
+  if (!is_numeric()) {
+    return empty();
+  }
+
+  std::string t = value ? value->getTypeString() : node->getType();
+  NodeItem res(graph_);
+  if (value) {
+    if (t == "float") {
+      float v = value->asA<float>();
+      res.value = MaterialX::Value::createValue<float>(func(v));
+    }
+    else if (t == "color3") {
+      auto v = value->asA<MaterialX::Color3>();
+      res.value = MaterialX::Value::createValue<MaterialX::Color3>(
+          {func(v[0]), func(v[1]), func(v[2])});
+    }
+    else if (t == "color4") {
+      auto v = value->asA<MaterialX::Color4>();
+      res.value = MaterialX::Value::createValue<MaterialX::Color4>(
+          {func(v[0]), func(v[1]), func(v[2]), func(v[3])});
+    }
+    else if (t == "vector2") {
+      auto v = value->asA<MaterialX::Vector2>();
+      res.value = MaterialX::Value::createValue<MaterialX::Vector2>({func(v[0]), func(v[1])});
+    }
+    else if (t == "vector3") {
+      auto v = value->asA<MaterialX::Vector3>();
+      res.value = MaterialX::Value::createValue<MaterialX::Vector3>(
+          {func(v[0]), func(v[1]), func(v[2])});
+    }
+    else if (t == "vector4") {
+      auto v = value->asA<MaterialX::Vector4>();
+      res.value = MaterialX::Value::createValue<MaterialX::Vector4>(
+          {func(v[0]), func(v[1]), func(v[2]), func(v[3])});
+    }
+    else {
+      BLI_assert_unreachable();
+    }
+  }
+  else {
+    res.node = graph_->addNode(mx_category, MaterialX::EMPTY_STRING, t);
+    res.set_input("in", *this);
+  }
+  return res;
+}
+
+NodeItem NodeItem::arithmetic(const NodeItem &other,
+                              const std::string &mx_category,
+                              std::function<float(float, float)> func) const
+{
+  NodeItem res = empty();
+  if (!is_numeric() || !other.is_numeric()) {
+    return res;
+  }
+
+  std::string mx_type;
+  if (value && other.value) {
+    auto val1 = value;
+    auto val2 = other.value;
+    if (!adjust_types(val1, val2, mx_type)) {
+      return res;
+    }
+
+    if (mx_type == "float") {
+      float v1 = val1->asA<float>();
+      float v2 = val2->asA<float>();
+      res.value = MaterialX::Value::createValue<float>(func(v1, v2));
+    }
+    else if (mx_type == "color3") {
+      auto v1 = val1->asA<MaterialX::Color3>();
+      auto v2 = val2->asA<MaterialX::Color3>();
+      res.value = MaterialX::Value::createValue<MaterialX::Color3>(
+          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2])});
+    }
+    else if (mx_type == "color4") {
+      auto v1 = val1->asA<MaterialX::Color4>();
+      auto v2 = val2->asA<MaterialX::Color4>();
+      res.value = MaterialX::Value::createValue<MaterialX::Color4>(
+          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2]), func(v1[3], v2[3])});
+    }
+    else if (mx_type == "vector2") {
+      auto v1 = val1->asA<MaterialX::Vector2>();
+      auto v2 = val2->asA<MaterialX::Vector2>();
+      res.value = MaterialX::Value::createValue<MaterialX::Vector2>(
+          {func(v1[0], v2[0]), func(v1[1], v2[1])});
+    }
+    else if (mx_type == "vector3") {
+      auto v1 = val1->asA<MaterialX::Vector3>();
+      auto v2 = val2->asA<MaterialX::Vector3>();
+      res.value = MaterialX::Value::createValue<MaterialX::Vector3>(
+          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2])});
+    }
+    else if (mx_type == "vector4") {
+      auto v1 = val1->asA<MaterialX::Vector4>();
+      auto v2 = val2->asA<MaterialX::Vector4>();
+      res.value = MaterialX::Value::createValue<MaterialX::Vector4>(
+          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2]), func(v1[3], v2[3])});
+    }
+    else {
+      BLI_assert_unreachable();
+    }
+  }
+  else {
+    auto val1 = *this;
+    auto val2 = other;
+    if (!adjust_types(val1, val2, mx_type)) {
+      return res;
+    }
+
+    res.node = graph_->addNode(mx_category, MaterialX::EMPTY_STRING, mx_type);
+    res.set_input("in1", val1);
+    res.set_input("in2", val2);
+  }
+  return res;
+}
+
+MaterialX::ValuePtr NodeItem::float_to_type(float v, std::string mx_type)
+{
+  if (mx_type == "float") {
+    return MaterialX::Value::createValue<float>(v);
+  }
+  if (mx_type == "color3") {
+    return MaterialX::Value::createValue<MaterialX::Color3>({v, v, v});
+  }
+  if (mx_type == "color4") {
+    return MaterialX::Value::createValue<MaterialX::Color4>({v, v, v, 1.0f});
+  }
+  if (mx_type == "vector2") {
+    return MaterialX::Value::createValue<MaterialX::Vector2>({v, v});
+  }
+  if (mx_type == "vector3") {
+    return MaterialX::Value::createValue<MaterialX::Vector3>({v, v, v});
+  }
+  if (mx_type == "vector4") {
+    return MaterialX::Value::createValue<MaterialX::Vector4>({v, v, v, 1.0f});
+  }
+
+  BLI_assert_unreachable();
+  return nullptr;
+}
+
+bool NodeItem::adjust_types(MaterialX::ValuePtr &val1, MaterialX::ValuePtr &val2, std::string &mx_type)
+{
+  std::string t1 = val1->getTypeString();
+  std::string t2 = val2->getTypeString();
+  if (t1 != t2) {
+    if (t1 == "float") {
+      val1 = float_to_type(val1->asA<float>(), t2);
+      mx_type = t2;
+    }
+    else if (t2 == "float") {
+      val2 = float_to_type(val2->asA<float>(), t1);
+      mx_type = t1;
+    }
+    else {
+      return false;
+    }
+  }
+  else {
+    mx_type = t1;
+  }
+  return true;
+}
+
+bool NodeItem::adjust_types(NodeItem &val1, NodeItem &val2, std::string &mx_type)
+{
+  std::string t1 = val1.type();
+  std::string t2 = val2.type();
+  if (t1 != t2) {
+    if (val1.value && t1 == "float") {
+      val1.value = float_to_type(val1.value->asA<float>(), t2);
+      mx_type = t2;
+    }
+    else if (val2.value && t2 == "float") {
+      val2.value = float_to_type(val2.value->asA<float>(), t1);
+      mx_type = t1;
+    }
+    else {
+      return false;
+    }
+  }
+  else {
+    mx_type = t1;
+  }
+  return true;
+}
+
+}  // namespace blender::nodes::materialx

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

@@ -0,0 +1,99 @@
+/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later */
+
+#pragma once
+
+#include <MaterialXCore/Node.h>
+
+namespace blender::nodes::materialx {
+
+class NodeItem {
+ public:
+  MaterialX::ValuePtr value;
+  MaterialX::NodePtr node;
+
+ private:
+  MaterialX::GraphElement *graph_;
+
+ public:
+  NodeItem(MaterialX::GraphElement *graph);
+  ~NodeItem() = default;
+
+  NodeItem empty() const;
+  template<class T> NodeItem val(const T &data) const;
+
+  template<class T>
+  void set_input(const std::string &name, const T &value, const std::string &mx_type);
+  void set_input(const std::string &name, const NodeItem &item);
+  void set_input(const std::string &name, const MaterialX::ValuePtr value);
+  void set_input(const std::string &name, const MaterialX::NodePtr node);
+
+  operator bool() const;
+  NodeItem operator+(const NodeItem &other) const;
+  NodeItem operator-(const NodeItem &other) const;
+  NodeItem operator-() const;
+  NodeItem operator*(const NodeItem &other) const;
+  NodeItem operator/(const NodeItem &other) const;
+  NodeItem operator%(const NodeItem &other) const;
+  NodeItem operator^(const NodeItem &other) const;
+  bool operator==(const NodeItem &other) const;
+  bool operator!=(const NodeItem &other) const;
+
+  NodeItem abs() const;
+  NodeItem floor() const;
+  NodeItem ceil() const;
+  NodeItem min(const NodeItem &other) const;
+  NodeItem max(const NodeItem &other) const;
+  NodeItem dotproduct(const NodeItem &other) const;
+  NodeItem if_else(const std::string &condition,
+                   const NodeItem &other,
+                   const NodeItem &if_val,
+                   const NodeItem &else_val) const;
+  NodeItem blend(const NodeItem &a, const NodeItem &b) const;
+  NodeItem clamp(const NodeItem &min_val, const NodeItem &max_val) const;
+  NodeItem clamp(float min_val = 0.0f, float max_val = 1.0f) const;
+  NodeItem sin() const;
+  NodeItem cos() const;
+  NodeItem tan() const;
+  NodeItem asin() const;
+  NodeItem acos() const;
+  NodeItem atan() const;
+  NodeItem atan2(const NodeItem &other) const;
+  NodeItem sinh() const;
+  NodeItem cosh() const;
+  NodeItem tanh() const;
+  NodeItem ln() const;
+  NodeItem sqrt() const;
+  NodeItem sign() const;
+  NodeItem exp() const;
+
+  NodeItem to_color3() const;
+  bool is_numeric() const;
+  std::string type() const;
+
+ private:
+  NodeItem arithmetic(const std::string &mx_category, std::function<float(float)> func) const;
+  NodeItem arithmetic(const NodeItem &other,
+                      const std::string &mx_category,
+                      std::function<float(float, float)> func) const;
+  static MaterialX::ValuePtr float_to_type(float v, std::string mx_type);
+  /* Functions for adjusting values to make equal types  */
+  static bool adjust_types(MaterialX::ValuePtr &val1, MaterialX::ValuePtr &val2, std::string &mx_type);
+  static bool adjust_types(NodeItem &val1, NodeItem &val2, std::string &mx_type);
+};
+
+template<class T> NodeItem NodeItem::val(const T &data) const
+{
+  NodeItem res(graph_);
+  res.value = MaterialX::Value::createValue<T>(data);
+  return res;
+}
+
+template<class T>
+void NodeItem::set_input(const std::string &name, const T &value, const std::string &mx_type)
+{
+  node->setInputValue(name, value, mx_type);
+}
+
+}  // namespace blender::nodes::materialx

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

@@ -8,323 +8,6 @@
 
 namespace blender::nodes::materialx {
 
-NodeItem::NodeItem(MaterialX::GraphElement *graph) : graph_(graph) {}
-
-NodeItem NodeItem::empty() const
-{
-  return NodeItem(graph_);
-}
-
-void NodeItem::set_input(const std::string &name, const NodeItem &item)
-{
-  if (item.value) {
-    set_input(name, item.value);
-  }
-  else if (item.node) {
-    set_input(name, item.node);
-  }
-}
-
-void NodeItem::set_input(const std::string &name, const MaterialX::ValuePtr value)
-{
-  std::string mx_type = value->getTypeString();
-  if (value->isA<float>()) {
-    set_input(name, value->asA<float>(), mx_type);
-  }
-  else if (value->isA<MaterialX::Vector2>()) {
-    set_input(name, value->asA<MaterialX::Vector2>(), mx_type);
-  }
-  else if (value->isA<MaterialX::Vector3>()) {
-    set_input(name, value->asA<MaterialX::Vector3>(), mx_type);
-  }
-  else if (value->isA<MaterialX::Vector4>()) {
-    set_input(name, value->asA<MaterialX::Vector4>(), mx_type);
-  }
-  else if (value->isA<MaterialX::Color3>()) {
-    set_input(name, value->asA<MaterialX::Color3>(), mx_type);
-  }
-  else if (value->isA<MaterialX::Color4>()) {
-    set_input(name, value->asA<MaterialX::Color4>(), mx_type);
-  }
-  else if (value->isA<std::string>()) {
-    set_input(name, value->asA<std::string>(), mx_type);
-  }
-  else {
-    BLI_assert_unreachable();
-  }
-}
-
-void NodeItem::set_input(const std::string &name, const MaterialX::NodePtr node)
-{
-  this->node->setConnectedNode(name, node);
-}
-
-NodeItem::operator bool() const
-{
-  return value || node;
-}
-
-NodeItem NodeItem::operator+(const NodeItem &other) const
-{
-  return arithmetic(other, "add", [](float a, float b) { return a + b; });
-}
-
-NodeItem NodeItem::operator-(const NodeItem &other) const
-{
-  return arithmetic(other, "subtract", [](float a, float b) { return a - b; });
-}
-
-NodeItem NodeItem::operator*(const NodeItem &other) const
-{
-  return arithmetic(other, "multiply", [](float a, float b) { return a * b; });
-}
-
-NodeItem NodeItem::operator/(const NodeItem &other) const
-{
-  return arithmetic(other, "divide", [](float a, float b) { return b == 0.0f ? 0.0f : a / b; });
-}
-
-bool NodeItem::operator==(const NodeItem &other) const
-{
-  if (node && node == other.node) {
-    return true;
-  }
-  /* TODO: implement */
-  return false;
-}
-
-NodeItem NodeItem::min(const NodeItem &other) const
-{
-  return arithmetic(other, "min", [](float a, float b) { return std::min(a, b); });
-}
-
-NodeItem NodeItem::max(const NodeItem &other) const
-{
-  return arithmetic(other, "max", [](float a, float b) { return std::max(a, b); });
-}
-
-NodeItem NodeItem::blend(const NodeItem &a, const NodeItem &b) const
-{
-  return (val(1.0f) - *this) * a + *this * b;
-}
-
-NodeItem NodeItem::to_color3() const
-{
-  std::string t = type();
-  NodeItem res = empty();
-  if (value) {
-    MaterialX::Color3 c;
-    if (t == "float") {
-      float v = value->asA<float>();
-      c = {v, v, v};
-    }
-    else if (t == "color3") {
-      auto v = value->asA<MaterialX::Color3>();
-      c = {v[0], v[1], v[2]};
-    }
-    else if (t == "color4") {
-      auto v = value->asA<MaterialX::Color4>();
-      c = {v[0], v[1], v[2]};
-    }
-    else if (t == "vector3") {
-      auto v = value->asA<MaterialX::Vector3>();
-      c = {v[0], v[1], v[2]};
-    }
-    else if (t == "vector4") {
-      auto v = value->asA<MaterialX::Vector4>();
-      c = {v[0], v[1], v[2]};
-    }
-    else {
-      return res;
-    }
-    res.value = MaterialX::Value::createValue<MaterialX::Color3>(c);
-  }
-  else if (node) {
-    if (t != "color3") {
-      return res;
-    }
-    res.node = node;
-  }
-  return res;
-}
-
-bool NodeItem::is_numeric() const
-{
-  std::string t = type();
-  return ELEM(t, "float", "color3", "color4", "vector2", "vector3", "vector4");
-}
-
-std::string NodeItem::type() const
-{
-  return value ? value->getTypeString() : node->getType();
-}
-
-NodeItem NodeItem::arithmetic(const std::string &mx_category,
-                              std::function<float(float)> func) const
-{
-  if (!is_numeric()) {
-    return empty();
-  }
-
-  std::string t = value ? value->getTypeString() : node->getType();
-  NodeItem res(graph_);
-  if (value) {
-    if (t == "float") {
-      float v = value->asA<float>();
-      res.value = MaterialX::Value::createValue<float>(func(v));
-    }
-    else if (t == "color3") {
-      auto v = value->asA<MaterialX::Color3>();
-      res.value = MaterialX::Value::createValue<MaterialX::Color3>(
-          {func(v[0]), func(v[1]), func(v[2])});
-    }
-    else if (t == "color4") {
-      auto v = value->asA<MaterialX::Color4>();
-      res.value = MaterialX::Value::createValue<MaterialX::Color4>(
-          {func(v[0]), func(v[1]), func(v[2]), func(v[3])});
-    }
-    else if (t == "vector2") {
-      auto v = value->asA<MaterialX::Vector2>();
-      res.value = MaterialX::Value::createValue<MaterialX::Vector2>({func(v[0]), func(v[1])});
-    }
-    else if (t == "vector3") {
-      auto v = value->asA<MaterialX::Vector3>();
-      res.value = MaterialX::Value::createValue<MaterialX::Vector3>(
-          {func(v[0]), func(v[1]), func(v[2])});
-    }
-    else if (t == "vector4") {
-      auto v = value->asA<MaterialX::Vector4>();
-      res.value = MaterialX::Value::createValue<MaterialX::Vector4>(
-          {func(v[0]), func(v[1]), func(v[2]), func(v[3])});
-    }
-    else {
-      BLI_assert_unreachable();
-    }
-  }
-  else {
-    res.node = graph_->addNode(mx_category, MaterialX::EMPTY_STRING, t);
-    res.set_input("in", *this);
-  }
-  return res;
-}
-
-NodeItem NodeItem::arithmetic(const NodeItem &other,
-                              const std::string &mx_category,
-                              std::function<float(float, float)> func) const
-{
-  NodeItem res = empty();
-  if (!is_numeric() || !other.is_numeric()) {
-    return res;
-  }
-
-  std::string t1 = type();
-  std::string t2 = other.type();
-
-  if (value && other.value) {
-    std::string t = t1;
-    auto val1 = value;
-    auto val2 = other.value;
-    if (t1 != t2) {
-      if (t1 == "float") {
-        val1 = float_to_type(val1->asA<float>(), t2);
-        t = t2;
-      }
-      else if (t2 == "float") {
-        val2 = float_to_type(val2->asA<float>(), t1);
-      }
-      else {
-        return res;
-      }
-    }
-
-    if (t == "float") {
-      float v1 = val1->asA<float>();
-      float v2 = val2->asA<float>();
-      res.value = MaterialX::Value::createValue<float>(func(v1, v2));
-    }
-    else if (t == "color3") {
-      auto v1 = val1->asA<MaterialX::Color3>();
-      auto v2 = val2->asA<MaterialX::Color3>();
-      res.value = MaterialX::Value::createValue<MaterialX::Color3>(
-          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2])});
-    }
-    else if (t == "color4") {
-      auto v1 = val1->asA<MaterialX::Color4>();
-      auto v2 = val2->asA<MaterialX::Color4>();
-      res.value = MaterialX::Value::createValue<MaterialX::Color4>(
-          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2]), func(v1[3], v2[3])});
-    }
-    else if (t == "vector2") {
-      auto v1 = val1->asA<MaterialX::Vector2>();
-      auto v2 = val2->asA<MaterialX::Vector2>();
-      res.value = MaterialX::Value::createValue<MaterialX::Vector2>(
-          {func(v1[0], v2[0]), func(v1[1], v2[1])});
-    }
-    else if (t == "vector3") {
-      auto v1 = val1->asA<MaterialX::Vector3>();
-      auto v2 = val2->asA<MaterialX::Vector3>();
-      res.value = MaterialX::Value::createValue<MaterialX::Vector3>(
-          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2])});
-    }
-    else if (t == "vector4") {
-      auto v1 = val1->asA<MaterialX::Vector4>();
-      auto v2 = val2->asA<MaterialX::Vector4>();
-      res.value = MaterialX::Value::createValue<MaterialX::Vector4>(
-          {func(v1[0], v2[0]), func(v1[1], v2[1]), func(v1[2], v2[2]), func(v1[3], v2[3])});
-    }
-    else {
-      BLI_assert_unreachable();
-    }
-  }
-  else {
-    std::string t = t1;
-    auto val1 = *this;
-    auto val2 = other;
-    if (t1 != t2) {
-      if (val1.value && t1 == "float") {
-        val1.value = float_to_type(val1.value->asA<float>(), t2);
-        t = t2;
-      }
-      else if (val2.value && t2 == "float") {
-        val2.value = float_to_type(val2.value->asA<float>(), t1);
-      }
-      else {
-        return res;
-      }
-    }
-
-    res.node = graph_->addNode(mx_category, MaterialX::EMPTY_STRING, t);
-    res.set_input("in1", val1);
-    res.set_input("in2", val2);
-  }
-  return res;
-}
-
-MaterialX::ValuePtr NodeItem::float_to_type(float v, std::string t) const
-{
-  if (t == "float") {
-    return MaterialX::Value::createValue<float>(v);
-  }
-  if (t == "color3") {
-    return MaterialX::Value::createValue<MaterialX::Color3>({v, v, v});
-  }
-  if (t == "color4") {
-    return MaterialX::Value::createValue<MaterialX::Color4>({v, v, v, 1.0f});
-  }
-  if (t == "vector2") {
-    return MaterialX::Value::createValue<MaterialX::Vector2>({v, v});
-  }
-  if (t == "vector3") {
-    return MaterialX::Value::createValue<MaterialX::Vector3>({v, v, v});
-  }
-  if (t == "vector4") {
-    return MaterialX::Value::createValue<MaterialX::Vector4>({v, v, v, 1.0f});
-  }
-
-  BLI_assert_unreachable();
-  return nullptr;
-}
-
 NodeParser::NodeParser(MaterialX::GraphElement *graph,
                        const Depsgraph *depsgraph,
                        const Material *material,
@@ -337,7 +20,7 @@ NodeItem NodeParser::create_node(const std::string &mx_category,
                                  const std::string &mx_type,
                                  bool accessory)
 {
-  NodeItem res = empty_value();
+  NodeItem res = empty();
   res.node = graph->addNode(mx_category,
                             accessory ? MaterialX::EMPTY_STRING :
                                         MaterialX::createValidName(node->name),
@@ -347,9 +30,42 @@ NodeItem NodeParser::create_node(const std::string &mx_category,
 
 NodeItem NodeParser::get_input_default(const std::string &name)
 {
-  NodeItem res = empty_value();
+  return get_input_default(node->input_by_identifier(name));
+}
 
-  const bNodeSocket &socket = node->input_by_identifier(name);
+NodeItem NodeParser::get_input_default(int index)
+{
+  return get_input_default(node->input_socket(index));
+}
+
+NodeItem NodeParser::get_input_link(const std::string &name)
+{
+  return get_input_link(node->input_by_identifier(name));
+}
+
+NodeItem NodeParser::get_input_link(int index)
+{
+  return get_input_link(node->input_socket(index));
+}
+
+NodeItem NodeParser::get_input_value(const std::string &name)
+{
+  return get_input_value(node->input_by_identifier(name));
+}
+
+NodeItem NodeParser::get_input_value(int index)
+{
+  return get_input_value(node->input_socket(index));
+}
+
+NodeItem NodeParser::empty() const
+{
+  return NodeItem(graph);
+}
+
+NodeItem NodeParser::get_input_default(const bNodeSocket &socket)
+{
+  NodeItem res = empty();
   switch (socket.type) {
     case SOCK_FLOAT: {
       float v = socket.default_value_typed<bNodeSocketValueFloat>()->value;
@@ -372,11 +88,11 @@ NodeItem NodeParser::get_input_default(const std::string &name)
   return res;
 }
 
-NodeItem NodeParser::get_input_link(const std::string &name)
+NodeItem NodeParser::get_input_link(const bNodeSocket &socket)
 {
-  NodeItem res = empty_value();
+  NodeItem res = empty();
 
-  const bNodeLink *link = node->input_by_identifier(name).link;
+  const bNodeLink *link = socket.link;
   if (!(link && link->is_used())) {
     return res;
   }
@@ -419,18 +135,13 @@ NodeItem NodeParser::get_input_link(const std::string &name)
   return res;
 }
 
-NodeItem NodeParser::get_input_value(const std::string &name)
+NodeItem NodeParser::get_input_value(const bNodeSocket &socket)
 {
-  NodeItem res = get_input_link(name);
+  NodeItem res = get_input_link(socket);
   if (!res) {
-    res = get_input_default(name);
+    res = get_input_default(socket);
   }
   return res;
 }
 
-NodeItem NodeParser::empty_value()
-{
-  return NodeItem(graph);
-}
-
 }  // namespace blender::nodes::materialx

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

@@ -4,7 +4,7 @@
 
 #pragma once
 
-#include <MaterialXCore/Document.h>
+#include "node_item.h"
 
 #include "DEG_depsgraph.h"
 #include "DNA_material_types.h"
@@ -12,63 +12,6 @@
 
 namespace blender::nodes::materialx {
 
-class NodeItem {
- public:
-  MaterialX::ValuePtr value;
-  MaterialX::NodePtr node;
-
- private:
-  MaterialX::GraphElement *graph_;
-
- public:
-  NodeItem(MaterialX::GraphElement *graph);
-  ~NodeItem() = default;
-
-  NodeItem empty() const;
-  template<class T> NodeItem val(const T &data) const;
-
-  template<class T>
-  void set_input(const std::string &name, const T &value, const std::string &mx_type);
-  void set_input(const std::string &name, const NodeItem &item);
-  void set_input(const std::string &name, const MaterialX::ValuePtr value);
-  void set_input(const std::string &name, const MaterialX::NodePtr node);
-
-  operator bool() const;
-  NodeItem operator+(const NodeItem &other) const;
-  NodeItem operator-(const NodeItem &other) const;
-  NodeItem operator*(const NodeItem &other) const;
-  NodeItem operator/(const NodeItem &other) const;
-  bool operator==(const NodeItem &other) const;
-
-  NodeItem min(const NodeItem &other) const;
-  NodeItem max(const NodeItem &other) const;
-  NodeItem blend(const NodeItem &a, const NodeItem &b) const;
-
-  NodeItem to_color3() const;
-  bool is_numeric() const;
-  std::string type() const;
-
- private:
-  NodeItem arithmetic(const std::string &mx_category, std::function<float(float)> func) const;
-  NodeItem arithmetic(const NodeItem &other,
-                      const std::string &mx_category,
-                      std::function<float(float, float)> func) const;
-  MaterialX::ValuePtr float_to_type(float v, std::string t) const;
-};
-
-template<class T> NodeItem NodeItem::val(const T &data) const
-{
-  NodeItem res(graph_);
-  res.value = MaterialX::Value::createValue<T>(data);
-  return res;
-}
-
-template<class T>
-void NodeItem::set_input(const std::string &name, const T &value, const std::string &mx_type)
-{
-  node->setInputValue(name, value, mx_type);
-}
-
 class NodeParser {
  public:
   MaterialX::GraphElement *graph;
@@ -90,11 +33,25 @@ class NodeParser {
                        const std::string &mx_type,
                        bool accessory = false);
   NodeItem get_input_default(const std::string &name);
+  NodeItem get_input_default(int index);
   NodeItem get_input_link(const std::string &name);
+  NodeItem get_input_link(int index);
   NodeItem get_input_value(const std::string &name);
-  NodeItem empty_value();
+  NodeItem get_input_value(int index);
+  NodeItem empty() const;
+  template<class T> NodeItem value(const T &data) const;
+
+ private:
+  NodeItem get_input_default(const bNodeSocket &socket);
+  NodeItem get_input_link(const bNodeSocket &socket);
+  NodeItem get_input_value(const bNodeSocket &socket);
 };
 
+template<class T> NodeItem NodeParser::value(const T &data) const
+{
+  return empty().val(data);
+}
+
 #define DECLARE_PARSER(T) \
   class T : public NodeParser { \
    public: \

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

@@ -8,7 +8,7 @@ namespace blender::nodes::materialx {
 
 NodeItem OutputMaterialNodeParser::compute()
 {
-  NodeItem node = empty_value();
+  NodeItem node = empty();
   NodeItem surface = get_input_link("Surface");
   if (surface) {
     node = create_node("surfacematerial", "material");