Cycles: add Displacement node.

This converts object space height to world space displacement, to be
linked to the new vector displacement material output.

Differential Revision: https://developer.blender.org/D3015

7 files changed, 75 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index 30175a42ce5..854a3e64acc 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -790,6 +790,7 @@ struct ShadeResult;
 #define SH_NODE_TEX_POINTDENSITY		192
 #define SH_NODE_BSDF_PRINCIPLED         193
 #define SH_NODE_BEVEL                   197
+#define SH_NODE_DISPLACEMENT            198
 
 /* custom defines options for Material node */
 #define SH_NODE_MAT_DIFF   1
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 3bec7cf386a..932b8b0c30a 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -3589,6 +3589,7 @@ static void registerShaderNodes(void)
 
 	register_node_type_sh_attribute();
 	register_node_type_sh_bevel();
+	register_node_type_sh_displacement();
 	register_node_type_sh_geometry();
 	register_node_type_sh_light_path();
 	register_node_type_sh_light_falloff();
diff --git a/source/blender/gpu/shaders/gpu_shader_material.glsl b/source/blender/gpu/shaders/gpu_shader_material.glsl
index f98d7b9f5bb..b89317da84a 100644
--- a/source/blender/gpu/shaders/gpu_shader_material.glsl
+++ b/source/blender/gpu/shaders/gpu_shader_material.glsl
@@ -3816,6 +3816,11 @@ void node_bevel(float radius, vec3 N, out vec3 result)
 	result = N;
 }
 
+void node_displacement(float height, float dist, vec3 N, out vec3 result)
+{
+	result = height * dist * N;
+}
+
 /* output */
 
 void node_output_material(vec4 surface, vec4 volume, float displacement, out vec4 result)
diff --git a/source/blender/nodes/CMakeLists.txt b/source/blender/nodes/CMakeLists.txt
index 21f9afec903..f8cbd14a346 100644
--- a/source/blender/nodes/CMakeLists.txt
+++ b/source/blender/nodes/CMakeLists.txt
@@ -193,6 +193,7 @@ set(SRC
 	shader/nodes/node_shader_subsurface_scattering.c
 	shader/nodes/node_shader_tangent.c
 	shader/nodes/node_shader_bevel.c
+	shader/nodes/node_shader_displacement.c
 	shader/nodes/node_shader_tex_brick.c
 	shader/nodes/node_shader_tex_checker.c
 	shader/nodes/node_shader_tex_coord.c
diff --git a/source/blender/nodes/NOD_shader.h b/source/blender/nodes/NOD_shader.h
index f7d36e3dbef..9590b0c7944 100644
--- a/source/blender/nodes/NOD_shader.h
+++ b/source/blender/nodes/NOD_shader.h
@@ -79,6 +79,7 @@ void register_node_type_sh_tex_pointdensity(void);
 
 void register_node_type_sh_attribute(void);
 void register_node_type_sh_bevel(void);
+void register_node_type_sh_displacement(void);
 void register_node_type_sh_geometry(void);
 void register_node_type_sh_light_path(void);
 void register_node_type_sh_light_falloff(void);
diff --git a/source/blender/nodes/NOD_static_types.h b/source/blender/nodes/NOD_static_types.h
index 13844298c5a..56a34a92b93 100644
--- a/source/blender/nodes/NOD_static_types.h
+++ b/source/blender/nodes/NOD_static_types.h
@@ -127,6 +127,7 @@ DefNode( ShaderNode,     SH_NODE_UVALONGSTROKE,      def_sh_uvalongstroke,   "UV
 DefNode( ShaderNode,     SH_NODE_SEPXYZ,             0,                      "SEPXYZ",             SeparateXYZ,      "Separate XYZ",      ""       )
 DefNode( ShaderNode,     SH_NODE_COMBXYZ,            0,                      "COMBXYZ",            CombineXYZ,       "Combine XYZ",       ""       )
 DefNode( ShaderNode,     SH_NODE_BEVEL,              def_sh_bevel,           "BEVEL",              Bevel,            "Bevel",             ""       )
+DefNode( ShaderNode,     SH_NODE_DISPLACEMENT,       0,                      "DISPLACEMENT",       Displacement,     "Displacement",      ""       )
 
 DefNode( CompositorNode, CMP_NODE_VIEWER,         def_cmp_viewer,         "VIEWER",         Viewer,           "Viewer",            ""              )
 DefNode( CompositorNode, CMP_NODE_RGB,            0,                      "RGB",            RGB,              "RGB",               ""              )
diff --git a/source/blender/nodes/shader/nodes/node_shader_displacement.c b/source/blender/nodes/shader/nodes/node_shader_displacement.c
new file mode 100644
index 00000000000..bcd11b758f8
--- /dev/null
+++ b/source/blender/nodes/shader/nodes/node_shader_displacement.c
@@ -0,0 +1,65 @@
+/*
+ * ***** 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): none yet.
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+#include "../node_shader_util.h"
+
+/* **************** OUTPUT ******************** */
+
+static bNodeSocketTemplate sh_node_displacement_in[] = {
+	{	SOCK_FLOAT, 0, N_("Height"), 0.00f, 0.0f, 0.0f, 0.0f, 0.0f, 1000.0f},
+	{	SOCK_FLOAT, 0, N_("Scale"), 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1000.0f},
+	{	SOCK_VECTOR, 1, N_("Normal"), 0.0f, 0.0f, 0.0f, 1.0f, -1.0f, 1.0f, PROP_NONE, SOCK_HIDE_VALUE},
+	{	-1, 0, ""	}
+};
+
+static bNodeSocketTemplate sh_node_displacement_out[] = {
+	{	SOCK_VECTOR, 0, N_("Displacement"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
+	{	-1, 0, ""	}
+};
+
+static int gpu_shader_displacement(GPUMaterial *mat, bNode *UNUSED(node), bNodeExecData *UNUSED(execdata), GPUNodeStack *in, GPUNodeStack *out)
+{
+	if (!in[2].link) {
+		GPU_link(mat, "direction_transform_m4v3", GPU_builtin(GPU_VIEW_NORMAL), GPU_builtin(GPU_INVERSE_VIEW_MATRIX), &in[2].link);
+	}
+
+	return GPU_stack_link(mat, "node_displacement", in, out);
+}
+
+/* node type definition */
+void register_node_type_sh_displacement(void)
+{
+	static bNodeType ntype;
+
+	sh_node_type_base(&ntype, SH_NODE_DISPLACEMENT, "Displacement", NODE_CLASS_OP_VECTOR, 0);
+	node_type_compatibility(&ntype, NODE_NEW_SHADING);
+	node_type_socket_templates(&ntype, sh_node_displacement_in, sh_node_displacement_out);
+	node_type_storage(&ntype, "", NULL, NULL);
+	node_type_gpu(&ntype, gpu_shader_displacement);
+
+	nodeRegisterType(&ntype);
+}