node_shader_volume_principled.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_volume_principled_in[] = {
    {SOCK_RGBA, N_("Color"), 0.5f, 0.5f, 0.5f, 1.0f, 0.0f, 1.0f},
    {SOCK_STRING, N_("Color Attribute"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
    {SOCK_FLOAT, N_("Density"), 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1000.0f},
    {SOCK_STRING, N_("Density Attribute"), 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
    {SOCK_FLOAT, N_("Anisotropy"), 0.0f, 0.0f, 0.0f, 0.0f, -1.0f, 1.0f, PROP_FACTOR},
    {SOCK_RGBA, N_("Absorption Color"), 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1.0f},
    {SOCK_FLOAT, N_("Emission Strength"), 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 1000.0f},
    {SOCK_RGBA, N_("Emission Color"), 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f},
    {SOCK_FLOAT, N_("Blackbody Intensity"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, PROP_FACTOR},
    {SOCK_RGBA, N_("Blackbody Tint"), 1.0f, 1.0f, 1.0f, 1.0f, 0.0f, 1.0f},
    {SOCK_FLOAT, N_("Temperature"), 1000.0f, 0.0f, 0.0f, 0.0f, 0.0f, 6500.0f},
    {SOCK_STRING, N_("Temperature Attribute"), 0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f},
    {-1, ""},
};
 
static bNodeSocketTemplate sh_node_volume_principled_out[] = {
    {SOCK_SHADER, N_("Volume")},
    {-1, ""},
};
 
static void node_shader_init_volume_principled(bNodeTree *UNUSED(ntree), bNode *node)
{
  LISTBASE_FOREACH (bNodeSocket *, sock, &node->inputs) {
    if (STREQ(sock->name, "Density Attribute")) {
      strcpy(((bNodeSocketValueString *)sock->default_value)->value, "density");
    }
    else if (STREQ(sock->name, "Temperature Attribute")) {
      strcpy(((bNodeSocketValueString *)sock->default_value)->value, "temperature");
    }
  }
}
 
static int node_shader_gpu_volume_principled(GPUMaterial *mat,
                                             bNode *node,
                                             bNodeExecData *UNUSED(execdata),
                                             GPUNodeStack *in,
                                             GPUNodeStack *out)
{
  /* Test if blackbody intensity is enabled. */
  bool use_blackbody = (in[8].link || in[8].vec[0] != 0.0f);
 
  /* Get volume attributes. */
  GPUNodeLink *density = NULL, *color = NULL, *temperature = NULL;
 
  LISTBASE_FOREACH (bNodeSocket *, sock, &node->inputs) {
    if (sock->typeinfo->type != SOCK_STRING) {
      continue;
    }
 
    bNodeSocketValueString *value = sock->default_value;
    const char *attribute_name = value->value;
    if (attribute_name[0] == '\0') {
      continue;
    }
 
    if (STREQ(sock->name, "Density Attribute")) {
      density = GPU_volume_grid(mat, attribute_name, GPU_VOLUME_DEFAULT_1);
    }
    else if (STREQ(sock->name, "Color Attribute")) {
      color = GPU_volume_grid(mat, attribute_name, GPU_VOLUME_DEFAULT_1);
    }
    else if (use_blackbody && STREQ(sock->name, "Temperature Attribute")) {
      temperature = GPU_volume_grid(mat, attribute_name, GPU_VOLUME_DEFAULT_0);
    }
  }
 
  /* Default values if attributes not found. */
  if (!density) {
    static float one = 1.0f;
    density = GPU_constant(&one);
  }
  if (!color) {
    static float white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
    color = GPU_constant(white);
  }
  if (!temperature) {
    static float one = 1.0f;
    temperature = GPU_constant(&one);
  }
 
  /* Create blackbody spectrum. */
  const int size = CM_TABLE + 1;
  float *data, layer;
  if (use_blackbody) {
    data = MEM_mallocN(sizeof(float) * size * 4, "blackbody texture");
    blackbody_temperature_to_rgb_table(data, size, 965.0f, 12000.0f);
  }
  else {
    data = MEM_callocN(sizeof(float) * size * 4, "blackbody black");
  }
  GPUNodeLink *spectrummap = GPU_color_band(mat, size, data, &layer);
 
  return GPU_stack_link(mat,
                        node,
                        "node_volume_principled",
                        in,
                        out,
                        density,
                        color,
                        temperature,
                        spectrummap,
                        GPU_constant(&layer));
}
 
/* node type definition */
void register_node_type_sh_volume_principled(void)
{
  static bNodeType ntype;
 
  sh_node_type_base(&ntype, SH_NODE_VOLUME_PRINCIPLED, "Principled Volume", NODE_CLASS_SHADER, 0);
  node_type_socket_templates(&ntype, sh_node_volume_principled_in, sh_node_volume_principled_out);
  node_type_size_preset(&ntype, NODE_SIZE_LARGE);
  node_type_init(&ntype, node_shader_init_volume_principled);
  node_type_storage(&ntype, "", NULL, NULL);
  node_type_gpu(&ntype, node_shader_gpu_volume_principled);
 
  nodeRegisterType(&ntype);
}