node_shader_attribute.c

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/*
 * 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"
 
/* **************** OUTPUT ******************** */
 
static bNodeSocketTemplate sh_node_attribute_out[] = {
    {SOCK_RGBA, N_("Color")},
    {SOCK_VECTOR, N_("Vector"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
    {SOCK_FLOAT, N_("Fac"), 0.0f, 0.0f, 0.0f, 0.0f, -FLT_MAX, FLT_MAX, PROP_FACTOR},
    {SOCK_FLOAT, N_("Alpha"), 0.0f, 0.0f, 0.0f, 0.0f, -FLT_MAX, FLT_MAX, PROP_FACTOR},
    {-1, ""},
};
 
static void node_shader_init_attribute(bNodeTree *UNUSED(ntree), bNode *node)
{
  NodeShaderAttribute *attr = MEM_callocN(sizeof(NodeShaderAttribute), "NodeShaderAttribute");
  node->storage = attr;
}
 
static int node_shader_gpu_attribute(GPUMaterial *mat,
                                     bNode *node,
                                     bNodeExecData *UNUSED(execdata),
                                     GPUNodeStack *in,
                                     GPUNodeStack *out)
{
  NodeShaderAttribute *attr = node->storage;
  bool is_varying = attr->type == SHD_ATTRIBUTE_GEOMETRY;
 
  if (GPU_material_is_volume_shader(mat) && is_varying) {
    if (out[0].hasoutput) {
      out[0].link = GPU_volume_grid(mat, attr->name, GPU_VOLUME_DEFAULT_0);
    }
    if (out[1].hasoutput) {
      out[1].link = GPU_volume_grid(mat, attr->name, GPU_VOLUME_DEFAULT_0);
    }
    if (out[2].hasoutput) {
      out[2].link = GPU_volume_grid(mat, attr->name, GPU_VOLUME_DEFAULT_0);
    }
    if (out[3].hasoutput) {
      static const float default_alpha = 1.0f;
      out[3].link = GPU_constant(&default_alpha);
    }
 
    return 1;
  }
 
  GPUNodeLink *cd_attr;
 
  if (is_varying) {
    cd_attr = GPU_attribute(mat, CD_AUTO_FROM_NAME, attr->name);
  }
  else {
    cd_attr = GPU_uniform_attribute(mat, attr->name, attr->type == SHD_ATTRIBUTE_INSTANCER);
  }
 
  GPU_stack_link(mat, node, "node_attribute", in, out, cd_attr);
 
  /* for each output. */
  for (int i = 0; sh_node_attribute_out[i].type != -1; i++) {
    node_shader_gpu_bump_tex_coord(mat, node, &out[i].link);
  }
 
  return 1;
}
 
/* node type definition */
void register_node_type_sh_attribute(void)
{
  static bNodeType ntype;
 
  sh_node_type_base(&ntype, SH_NODE_ATTRIBUTE, "Attribute", NODE_CLASS_INPUT, 0);
  node_type_socket_templates(&ntype, NULL, sh_node_attribute_out);
  node_type_init(&ntype, node_shader_init_attribute);
  node_type_storage(
      &ntype, "NodeShaderAttribute", node_free_standard_storage, node_copy_standard_storage);
  node_type_gpu(&ntype, node_shader_gpu_attribute);
 
  nodeRegisterType(&ntype);
}