node_shader_blackbody.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"
 
/* **************** Blackbody ******************** */
static bNodeSocketTemplate sh_node_blackbody_in[] = {
    {SOCK_FLOAT, N_("Temperature"), 1500.0f, 0.0f, 0.0f, 0.0f, 800.0f, 12000.0f},
    {-1, ""},
};
 
static bNodeSocketTemplate sh_node_blackbody_out[] = {
    {SOCK_RGBA, N_("Color")},
    {-1, ""},
};
 
static int node_shader_gpu_blackbody(GPUMaterial *mat,
                                     bNode *node,
                                     bNodeExecData *UNUSED(execdata),
                                     GPUNodeStack *in,
                                     GPUNodeStack *out)
{
  const int size = CM_TABLE + 1;
  float *data = MEM_mallocN(sizeof(float) * size * 4, "blackbody texture");
 
  blackbody_temperature_to_rgb_table(data, size, 965.0f, 12000.0f);
 
  float layer;
  GPUNodeLink *ramp_texture = GPU_color_band(mat, size, data, &layer);
 
  return GPU_stack_link(mat, node, "node_blackbody", in, out, ramp_texture, GPU_constant(&layer));
}
 
/* node type definition */
void register_node_type_sh_blackbody(void)
{
  static bNodeType ntype;
 
  sh_node_type_base(&ntype, SH_NODE_BLACKBODY, "Blackbody", NODE_CLASS_CONVERTOR, 0);
  node_type_size_preset(&ntype, NODE_SIZE_MIDDLE);
  node_type_socket_templates(&ntype, sh_node_blackbody_in, sh_node_blackbody_out);
  node_type_init(&ntype, NULL);
  node_type_storage(&ntype, "", NULL, NULL);
  node_type_gpu(&ntype, node_shader_gpu_blackbody);
 
  nodeRegisterType(&ntype);
}