Shading: Add Vertex Color node.

This patch adds a new Vertex Color node. The node also returns the alpha
of the vertex color layer as an output.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5767

4 files changed, 61 insertions, 0 deletions

diff --git a/source/blender/nodes/CMakeLists.txt b/source/blender/nodes/CMakeLists.txt
index ea2968f4917..57a4ace997c 100644
--- a/source/blender/nodes/CMakeLists.txt
+++ b/source/blender/nodes/CMakeLists.txt
@@ -206,6 +206,7 @@ set(SRC
   shader/nodes/node_shader_valToRgb.c
   shader/nodes/node_shader_value.c
   shader/nodes/node_shader_vectTransform.c
+  shader/nodes/node_shader_vertex_color.c
   shader/nodes/node_shader_vector_displacement.c
   shader/nodes/node_shader_vector_math.c
   shader/nodes/node_shader_volume_absorption.c
diff --git a/source/blender/nodes/NOD_shader.h b/source/blender/nodes/NOD_shader.h
index 30673e7cd31..a004090d03d 100644
--- a/source/blender/nodes/NOD_shader.h
+++ b/source/blender/nodes/NOD_shader.h
@@ -86,6 +86,7 @@ void register_node_type_sh_script(void);
 void register_node_type_sh_normal_map(void);
 void register_node_type_sh_tangent(void);
 void register_node_type_sh_vect_transform(void);
+void register_node_type_sh_vertex_color(void);
 
 void register_node_type_sh_ambient_occlusion(void);
 void register_node_type_sh_background(void);
diff --git a/source/blender/nodes/NOD_static_types.h b/source/blender/nodes/NOD_static_types.h
index d14511504f0..f3bc5a0cafa 100644
--- a/source/blender/nodes/NOD_static_types.h
+++ b/source/blender/nodes/NOD_static_types.h
@@ -121,6 +121,7 @@ DefNode(ShaderNode,     SH_NODE_VECT_TRANSFORM,     def_sh_vect_transform,  "VEC
 DefNode(ShaderNode,     SH_NODE_SEPHSV,             0,                      "SEPHSV",             SeparateHSV,      "Separate HSV",      ""       )
 DefNode(ShaderNode,     SH_NODE_COMBHSV,            0,                      "COMBHSV",            CombineHSV,       "Combine HSV",       ""       )
 DefNode(ShaderNode,     SH_NODE_UVMAP,              def_sh_uvmap,           "UVMAP",              UVMap,            "UV Map",            ""       )
+DefNode(ShaderNode,     SH_NODE_VERTEX_COLOR,       def_sh_vertex_color,    "VERTEX_COLOR",       VertexColor,      "Vertex Color",      ""       )
 DefNode(ShaderNode,     SH_NODE_UVALONGSTROKE,      def_sh_uvalongstroke,   "UVALONGSTROKE",      UVAlongStroke,    "UV Along Stroke",   ""       )
 DefNode(ShaderNode,     SH_NODE_SEPXYZ,             0,                      "SEPXYZ",             SeparateXYZ,      "Separate XYZ",      ""       )
 DefNode(ShaderNode,     SH_NODE_COMBXYZ,            0,                      "COMBXYZ",            CombineXYZ,       "Combine XYZ",       ""       )
diff --git a/source/blender/nodes/shader/nodes/node_shader_vertex_color.c b/source/blender/nodes/shader/nodes/node_shader_vertex_color.c
new file mode 100644
index 00000000000..8848fc37c66
--- /dev/null
+++ b/source/blender/nodes/shader/nodes/node_shader_vertex_color.c
@@ -0,0 +1,58 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2005 Blender Foundation.
+ * All rights reserved.
+ */
+
+#include "../node_shader_util.h"
+
+static bNodeSocketTemplate sh_node_vertex_color_out[] = {
+    {SOCK_RGBA, 0, N_("Color")},
+    {SOCK_FLOAT, 0, N_("Alpha")},
+    {-1, 0, ""},
+};
+
+static void node_shader_init_vertex_color(bNodeTree *UNUSED(ntree), bNode *node)
+{
+  NodeShaderVertexColor *vertexColor = MEM_callocN(sizeof(NodeShaderVertexColor),
+                                                   "NodeShaderVertexColor");
+  node->storage = vertexColor;
+}
+
+static int node_shader_gpu_vertex_color(GPUMaterial *mat,
+                                        bNode *node,
+                                        bNodeExecData *UNUSED(execdata),
+                                        GPUNodeStack *in,
+                                        GPUNodeStack *out)
+{
+  NodeShaderVertexColor *vertexColor = (NodeShaderVertexColor *)node->storage;
+  GPUNodeLink *vertexColorLink = GPU_attribute(CD_MCOL, vertexColor->layer_name);
+  return GPU_stack_link(mat, node, "node_vertex_color", in, out, vertexColorLink);
+}
+
+void register_node_type_sh_vertex_color(void)
+{
+  static bNodeType ntype;
+
+  sh_node_type_base(&ntype, SH_NODE_VERTEX_COLOR, "Vertex Color", NODE_CLASS_INPUT, 0);
+  node_type_socket_templates(&ntype, NULL, sh_node_vertex_color_out);
+  node_type_init(&ntype, node_shader_init_vertex_color);
+  node_type_storage(
+      &ntype, "NodeShaderVertexColor", node_free_standard_storage, node_copy_standard_storage);
+  node_type_gpu(&ntype, node_shader_gpu_vertex_color);
+
+  nodeRegisterType(&ntype);
+}