Shading: Add White Noise node.

The White Noise node hashes the input and returns a random number in the
range [0, 1]. The input can be a 1D, 2D, 3D, or a 4D vector.

Reviewers: brecht, JacquesLucke

Differential Revision: https://developer.blender.org/D5550

1 files changed, 76 insertions, 0 deletions

diff --git a/source/blender/nodes/shader/nodes/node_shader_tex_white_noise.c b/source/blender/nodes/shader/nodes/node_shader_tex_white_noise.c
new file mode 100644
index 00000000000..c0f9a033476
--- /dev/null
+++ b/source/blender/nodes/shader/nodes/node_shader_tex_white_noise.c
@@ -0,0 +1,76 @@
+/*
+ * 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"
+
+/* **************** WHITE NOISE **************** */
+
+static bNodeSocketTemplate sh_node_tex_white_noise_in[] = {
+    {SOCK_VECTOR, 1, N_("Vector"), 0.0f, 0.0f, 0.0f, 0.0f, -10000.0f, 10000.0f, PROP_NONE},
+    {SOCK_FLOAT, 1, N_("W"), 0.0f, 0.0f, 0.0f, 0.0f, -10000.0f, 10000.0f, PROP_NONE},
+    {-1, 0, ""}};
+
+static bNodeSocketTemplate sh_node_tex_white_noise_out[] = {
+    {SOCK_FLOAT, 0, N_("Value")},
+    {-1, 0, ""},
+};
+
+static void node_shader_init_tex_white_noise(bNodeTree *UNUSED(ntree), bNode *node)
+{
+  node->custom1 = 3;
+}
+
+static int gpu_shader_tex_white_noise(GPUMaterial *mat,
+                                      bNode *node,
+                                      bNodeExecData *UNUSED(execdata),
+                                      GPUNodeStack *in,
+                                      GPUNodeStack *out)
+{
+  static const char *names[] = {
+      "",
+      "node_white_noise_1d",
+      "node_white_noise_2d",
+      "node_white_noise_3d",
+      "node_white_noise_4d",
+  };
+
+  return GPU_stack_link(mat, node, names[node->custom1], in, out);
+}
+
+static void node_shader_update_tex_white_noise(bNodeTree *UNUSED(ntree), bNode *node)
+{
+  bNodeSocket *sockVector = nodeFindSocket(node, SOCK_IN, "Vector");
+  bNodeSocket *sockW = nodeFindSocket(node, SOCK_IN, "W");
+
+  nodeSetSocketAvailability(sockVector, node->custom1 != 1);
+  nodeSetSocketAvailability(sockW, node->custom1 == 1 || node->custom1 == 4);
+}
+
+void register_node_type_sh_tex_white_noise(void)
+{
+  static bNodeType ntype;
+
+  sh_node_type_base(&ntype, SH_NODE_TEX_WHITE_NOISE, "White Noise Texture", NODE_CLASS_TEXTURE, 0);
+  node_type_socket_templates(&ntype, sh_node_tex_white_noise_in, sh_node_tex_white_noise_out);
+  node_type_init(&ntype, node_shader_init_tex_white_noise);
+  node_type_gpu(&ntype, gpu_shader_tex_white_noise);
+  node_type_update(&ntype, node_shader_update_tex_white_noise);
+
+  nodeRegisterType(&ntype);
+}