Geometry Nodes: Add Shader Curve Nodes

Convert curve vec and curve rgb shader nodes to geometry nodes, based on node_shader_valToRgb.cc implementation.

release/scripts/startup/nodeitems_builtins.py

@@ -495,6 +495,7 @@ geometry_node_categories = [
         NodeItem("GeometryNodeAttributeTransfer"),
     ]),
     GeometryNodeCategory("GEO_COLOR", "Color", items=[
+        NodeItem("ShaderNodeRGBCurve"),
         NodeItem("ShaderNodeValToRGB"),
         NodeItem("ShaderNodeSeparateRGB"),
         NodeItem("ShaderNodeCombineRGB"),
@@ -557,6 +558,7 @@ geometry_node_categories = [
         NodeItem("GeometryNodeSwitch"),
     ]),
     GeometryNodeCategory("GEO_VECTOR", "Vector", items=[
+        NodeItem("ShaderNodeVectorCurve"),
         NodeItem("ShaderNodeSeparateXYZ"),
         NodeItem("ShaderNodeCombineXYZ"),
         NodeItem("ShaderNodeVectorMath"),

source/blender/blenkernel/intern/node.cc

@@ -513,7 +513,7 @@ void ntreeBlendWrite(BlendWriter *writer, bNodeTree *ntree)
 
     if (node->storage) {
       /* could be handlerized at some point, now only 1 exception still */
-      if ((ntree->type == NTREE_SHADER) &&
+      if ((ELEM(ntree->type, NTREE_SHADER, NTREE_GEOMETRY)) &&
           ELEM(node->type, SH_NODE_CURVE_VEC, SH_NODE_CURVE_RGB)) {
         BKE_curvemapping_blend_write(writer, (const CurveMapping *)node->storage);
       }

source/blender/nodes/shader/nodes/node_shader_curves.cc

@@ -104,17 +104,65 @@ static int gpu_shader_curve_vec(GPUMaterial *mat,
                         GPU_uniform(ext_xyz[2]));
 }
 
+class CurveVecFunction : public blender::fn::MultiFunction {
+ private:
+  const CurveMapping &cumap_;
+
+ public:
+  CurveVecFunction(const CurveMapping &cumap) : cumap_(cumap)
+  {
+    static blender::fn::MFSignature signature = create_signature();
+    this->set_signature(&signature);
+  }
+
+  static blender::fn::MFSignature create_signature()
+  {
+    blender::fn::MFSignatureBuilder signature{"Curve Vec"};
+    signature.single_input<float>("Fac");
+    signature.single_input<blender::float3>("Vector");
+    signature.single_output<blender::float3>("Vector");
+    return signature.build();
+  }
+
+  void call(blender::IndexMask mask,
+            blender::fn::MFParams params,
+            blender::fn::MFContext UNUSED(context)) const override
+  {
+    const blender::VArray<float> &fac = params.readonly_single_input<float>(0, "Fac");
+    const blender::VArray<blender::float3> &vec_in = params.readonly_single_input<blender::float3>(
+        1, "Vector");
+    blender::MutableSpan<blender::float3> vec_out =
+        params.uninitialized_single_output<blender::float3>(2, "Vector");
+
+    for (int64_t i : mask) {
+      BKE_curvemapping_evaluate3F(&cumap_, vec_out[i], vec_in[i]);
+      if (fac[i] != 1.0f) {
+        interp_v3_v3v3(vec_out[i], vec_in[i], vec_out[i], fac[i]);
+      }
+    }
+  }
+};
+
+static void sh_node_curve_vec_expand_in_mf_network(blender::nodes::NodeMFNetworkBuilder &builder)
+{
+  bNode &bnode = builder.bnode();
+  CurveMapping *cumap = (CurveMapping *)bnode.storage;
+  BKE_curvemapping_init(cumap);
+  builder.construct_and_set_matching_fn<CurveVecFunction>(*cumap);
+}
+
 void register_node_type_sh_curve_vec(void)
 {
   static bNodeType ntype;
 
-  sh_node_type_base(&ntype, SH_NODE_CURVE_VEC, "Vector Curves", NODE_CLASS_OP_VECTOR, 0);
+  sh_fn_node_type_base(&ntype, SH_NODE_CURVE_VEC, "Vector Curves", NODE_CLASS_OP_VECTOR, 0);
   node_type_socket_templates(&ntype, sh_node_curve_vec_in, sh_node_curve_vec_out);
   node_type_init(&ntype, node_shader_init_curve_vec);
   node_type_size_preset(&ntype, NODE_SIZE_LARGE);
   node_type_storage(&ntype, "CurveMapping", node_free_curves, node_copy_curves);
   node_type_exec(&ntype, node_initexec_curves, nullptr, node_shader_exec_curve_vec);
   node_type_gpu(&ntype, gpu_shader_curve_vec);
+  ntype.expand_in_mf_network = sh_node_curve_vec_expand_in_mf_network;
 
   nodeRegisterType(&ntype);
 }
@@ -230,17 +278,65 @@ static int gpu_shader_curve_rgb(GPUMaterial *mat,
                         GPU_uniform(ext_rgba[3]));
 }
 
+class CurveRGBFunction : public blender::fn::MultiFunction {
+ private:
+  const CurveMapping &cumap_;
+
+ public:
+  CurveRGBFunction(const CurveMapping &cumap) : cumap_(cumap)
+  {
+    static blender::fn::MFSignature signature = create_signature();
+    this->set_signature(&signature);
+  }
+
+  static blender::fn::MFSignature create_signature()
+  {
+    blender::fn::MFSignatureBuilder signature{"Curve RGB"};
+    signature.single_input<float>("Fac");
+    signature.single_input<blender::Color4f>("Color");
+    signature.single_output<blender::Color4f>("Color");
+    return signature.build();
+  }
+
+  void call(blender::IndexMask mask,
+            blender::fn::MFParams params,
+            blender::fn::MFContext UNUSED(context)) const override
+  {
+    const blender::VArray<float> &fac = params.readonly_single_input<float>(0, "Fac");
+    const blender::VArray<blender::Color4f> &col_in =
+        params.readonly_single_input<blender::Color4f>(1, "Color");
+    blender::MutableSpan<blender::Color4f> col_out =
+        params.uninitialized_single_output<blender::Color4f>(2, "Color");
+
+    for (int64_t i : mask) {
+      BKE_curvemapping_evaluateRGBF(&cumap_, col_out[i], col_in[i]);
+      if (fac[i] != 1.0f) {
+        interp_v3_v3v3(col_out[i], col_in[i], col_out[i], fac[i]);
+      }
+    }
+  }
+};
+
+static void sh_node_curve_rgb_expand_in_mf_network(blender::nodes::NodeMFNetworkBuilder &builder)
+{
+  bNode &bnode = builder.bnode();
+  CurveMapping *cumap = (CurveMapping *)bnode.storage;
+  BKE_curvemapping_init(cumap);
+  builder.construct_and_set_matching_fn<CurveRGBFunction>(*cumap);
+}
+
 void register_node_type_sh_curve_rgb(void)
 {
   static bNodeType ntype;
 
-  sh_node_type_base(&ntype, SH_NODE_CURVE_RGB, "RGB Curves", NODE_CLASS_OP_COLOR, 0);
+  sh_fn_node_type_base(&ntype, SH_NODE_CURVE_RGB, "RGB Curves", NODE_CLASS_OP_COLOR, 0);
   node_type_socket_templates(&ntype, sh_node_curve_rgb_in, sh_node_curve_rgb_out);
   node_type_init(&ntype, node_shader_init_curve_rgb);
   node_type_size_preset(&ntype, NODE_SIZE_LARGE);
   node_type_storage(&ntype, "CurveMapping", node_free_curves, node_copy_curves);
   node_type_exec(&ntype, node_initexec_curves, nullptr, node_shader_exec_curve_rgb);
   node_type_gpu(&ntype, gpu_shader_curve_rgb);
+  ntype.expand_in_mf_network = sh_node_curve_rgb_expand_in_mf_network;
 
   nodeRegisterType(&ntype);
 }