Shader Node Editor: Add Closure to RGB convertion node.

Patch D3205 by Kanzaki Wataru

Only implemented in Eevee for now. Collapse a closure to RGBA so we can
do NPR stuff on the resulting color.

Use an emission shader to convert the color back to a closure.

Doing this will break PBR and will kill any SSR and SSS effects the shader
the shader rely on. That said screen space refraction and ambient occlusion
are supported due to the way they are implemented.

4 files changed, 64 insertions, 0 deletions

diff --git a/source/blender/nodes/CMakeLists.txt b/source/blender/nodes/CMakeLists.txt
index efe7db088f8..5acd0a9fcea 100644
--- a/source/blender/nodes/CMakeLists.txt
+++ b/source/blender/nodes/CMakeLists.txt
@@ -177,6 +177,7 @@ set(SRC
 	shader/nodes/node_shader_light_falloff.c
 	shader/nodes/node_shader_light_path.c
 	shader/nodes/node_shader_mix_shader.c
+	shader/nodes/node_shader_shaderToRgb.c
 	shader/nodes/node_shader_normal_map.c
 	shader/nodes/node_shader_object_info.c
 	shader/nodes/node_shader_hair_info.c
diff --git a/source/blender/nodes/NOD_shader.h b/source/blender/nodes/NOD_shader.h
index e411ceb6a23..3d6a8647628 100644
--- a/source/blender/nodes/NOD_shader.h
+++ b/source/blender/nodes/NOD_shader.h
@@ -50,6 +50,7 @@ void register_node_type_sh_rgb(void);
 void register_node_type_sh_mix_rgb(void);
 void register_node_type_sh_valtorgb(void);
 void register_node_type_sh_rgbtobw(void);
+void register_node_type_sh_shadertorgb(void);
 void register_node_type_sh_normal(void);
 void register_node_type_sh_gamma(void);
 void register_node_type_sh_brightcontrast(void);
diff --git a/source/blender/nodes/NOD_static_types.h b/source/blender/nodes/NOD_static_types.h
index 299c3a627ee..efb8eb66737 100644
--- a/source/blender/nodes/NOD_static_types.h
+++ b/source/blender/nodes/NOD_static_types.h
@@ -45,6 +45,7 @@ DefNode( ShaderNode,     SH_NODE_VALUE,           0,                      "VALUE
 DefNode( ShaderNode,     SH_NODE_MIX_RGB,         def_mix_rgb,            "MIX_RGB",        MixRGB,           "MixRGB",            ""              )
 DefNode( ShaderNode,     SH_NODE_VALTORGB,        def_colorramp,          "VALTORGB",       ValToRGB,         "ColorRamp",         ""              )
 DefNode( ShaderNode,     SH_NODE_RGBTOBW,         0,                      "RGBTOBW",        RGBToBW,          "RGB to BW",         ""              )
+DefNode( ShaderNode,     SH_NODE_SHADERTORGB,     0,                      "SHADERTORGB",    ShaderToRGB,      "Shader to RGB",     ""              )
 DefNode( ShaderNode,     SH_NODE_NORMAL,          0,                      "NORMAL",         Normal,           "Normal",            ""              )
 DefNode( ShaderNode,     SH_NODE_GAMMA,           0,                      "GAMMA",          Gamma,            "Gamma",             ""              )
 DefNode( ShaderNode,     SH_NODE_BRIGHTCONTRAST,  0,                      "BRIGHTCONTRAST", BrightContrast,   "Bright Contrast",   ""              )
diff --git a/source/blender/nodes/shader/nodes/node_shader_shaderToRgb.c b/source/blender/nodes/shader/nodes/node_shader_shaderToRgb.c
new file mode 100644
index 00000000000..286752f9a10
--- /dev/null
+++ b/source/blender/nodes/shader/nodes/node_shader_shaderToRgb.c
@@ -0,0 +1,61 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is: all of this file.
+ *
+ * Contributor(s): Kanzaki Wataru, Kinouti Takahiro
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include "../node_shader_util.h"
+
+/* **************** OUTPUT ******************** */
+
+static bNodeSocketTemplate sh_node_shadertorgb_in[] = {
+	{	SOCK_SHADER, 1, N_("Shader")},
+	{	-1, 0, ""	}
+};
+
+static bNodeSocketTemplate sh_node_shadertorgb_out[] = {
+	{	SOCK_RGBA, 0, N_("Color")},
+	{	SOCK_FLOAT, 0, N_("Alpha")},
+	{	-1, 0, ""	}
+};
+
+static int node_shader_gpu_shadertorgb(GPUMaterial *mat, bNode *node, bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
+{
+	return GPU_stack_link(mat, node, "node_shadertorgb", in, out);
+}
+
+/* node type definition */
+void register_node_type_sh_shadertorgb(void)
+{
+	static bNodeType ntype;
+
+	sh_node_type_base(&ntype, SH_NODE_SHADERTORGB, "Shader to RGB", NODE_CLASS_CONVERTOR, 0);
+	node_type_compatibility(&ntype, NODE_NEW_SHADING);
+	node_type_socket_templates(&ntype, sh_node_shadertorgb_in, sh_node_shadertorgb_out);
+	node_type_init(&ntype, NULL);
+	node_type_storage(&ntype, "", NULL, NULL);
+	node_type_gpu(&ntype, node_shader_gpu_shadertorgb);
+
+	nodeRegisterType(&ntype);
+}