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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2005 Blender Foundation. All rights reserved. */
#include "node_shader_util.hh"
#include "IMB_colormanagement.h"
namespace blender::nodes::node_shader_volume_principled_cc {
static void node_declare(NodeDeclarationBuilder &b)
{
b.add_input<decl::Color>(N_("Color")).default_value({0.5f, 0.5f, 0.5f, 1.0f});
b.add_input<decl::String>(N_("Color Attribute"));
b.add_input<decl::Float>(N_("Density")).default_value(1.0f).min(0.0f).max(1000.0f);
b.add_input<decl::String>(N_("Density Attribute"));
b.add_input<decl::Float>(N_("Anisotropy"))
.default_value(0.0f)
.min(-1.0f)
.max(1.0f)
.subtype(PROP_FACTOR);
b.add_input<decl::Color>(N_("Absorption Color")).default_value({0.0f, 0.0f, 0.0f, 1.0f});
b.add_input<decl::Float>(N_("Emission Strength")).default_value(0.0f).min(0.0f).max(1000.0f);
b.add_input<decl::Color>(N_("Emission Color")).default_value({1.0f, 1.0f, 1.0f, 1.0f});
b.add_input<decl::Float>(N_("Blackbody Intensity"))
.default_value(0.0f)
.min(0.0f)
.max(1.0f)
.subtype(PROP_FACTOR);
b.add_input<decl::Color>(N_("Blackbody Tint")).default_value({1.0f, 1.0f, 1.0f, 1.0f});
b.add_input<decl::Float>(N_("Temperature")).default_value(1000.0f).min(0.0f).max(6500.0f);
b.add_input<decl::String>(N_("Temperature Attribute"));
b.add_input<decl::Float>(N_("Weight")).unavailable();
b.add_output<decl::Shader>(N_("Volume"));
}
static void node_shader_init_volume_principled(bNodeTree * /*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 void attribute_post_process(GPUMaterial *mat,
const char *attribute_name,
GPUNodeLink **attribute_link)
{
if (STREQ(attribute_name, "color")) {
GPU_link(mat, "node_attribute_color", *attribute_link, attribute_link);
}
else if (STREQ(attribute_name, "temperature")) {
GPU_link(mat, "node_attribute_temperature", *attribute_link, attribute_link);
}
}
static int node_shader_gpu_volume_principled(GPUMaterial *mat,
bNode *node,
bNodeExecData * /*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 = nullptr, *color = nullptr, *temperature = nullptr;
LISTBASE_FOREACH (bNodeSocket *, sock, &node->inputs) {
if (sock->typeinfo->type != SOCK_STRING) {
continue;
}
bNodeSocketValueString *value = (bNodeSocketValueString *)sock->default_value;
const char *attribute_name = value->value;
if (attribute_name[0] == '\0') {
continue;
}
if (STREQ(sock->name, "Density Attribute")) {
density = GPU_attribute_with_default(mat, CD_AUTO_FROM_NAME, attribute_name, GPU_DEFAULT_1);
attribute_post_process(mat, attribute_name, &density);
}
else if (STREQ(sock->name, "Color Attribute")) {
color = GPU_attribute_with_default(mat, CD_AUTO_FROM_NAME, attribute_name, GPU_DEFAULT_1);
attribute_post_process(mat, attribute_name, &color);
}
else if (use_blackbody && STREQ(sock->name, "Temperature Attribute")) {
temperature = GPU_attribute(mat, CD_AUTO_FROM_NAME, attribute_name);
attribute_post_process(mat, attribute_name, &temperature);
}
}
/* Default values if attributes not found. */
static float white[4] = {1.0f, 1.0f, 1.0f, 1.0f};
if (!density) {
density = GPU_constant(white);
}
if (!color) {
color = GPU_constant(white);
}
if (!temperature) {
temperature = GPU_constant(white);
}
/* Create blackbody spectrum. */
const int size = CM_TABLE + 1;
float *data, layer;
if (use_blackbody) {
data = (float *)MEM_mallocN(sizeof(float) * size * 4, "blackbody texture");
IMB_colormanagement_blackbody_temperature_to_rgb_table(data, size, 800.0f, 12000.0f);
}
else {
data = (float *)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));
}
} // namespace blender::nodes::node_shader_volume_principled_cc
/* node type definition */
void register_node_type_sh_volume_principled()
{
namespace file_ns = blender::nodes::node_shader_volume_principled_cc;
static bNodeType ntype;
sh_node_type_base(&ntype, SH_NODE_VOLUME_PRINCIPLED, "Principled Volume", NODE_CLASS_SHADER);
ntype.declare = file_ns::node_declare;
node_type_size_preset(&ntype, NODE_SIZE_LARGE);
ntype.initfunc = file_ns::node_shader_init_volume_principled;
ntype.gpu_fn = file_ns::node_shader_gpu_volume_principled;
nodeRegisterType(&ntype);
}
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