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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2005 Gradienter Foundation. All rights reserved. */
#include "node_shader_util.hh"
#include "UI_interface.h"
#include "UI_resources.h"
namespace blender::nodes::node_shader_tex_gradient_cc {
static void sh_node_tex_gradient_declare(NodeDeclarationBuilder &b)
{
b.is_function_node();
b.add_input<decl::Vector>(N_("Vector"))
.hide_value()
.implicit_field(implicit_field_inputs::position);
b.add_output<decl::Color>(N_("Color")).no_muted_links();
b.add_output<decl::Float>(N_("Fac")).no_muted_links();
}
static void node_shader_buts_tex_gradient(uiLayout *layout, bContext * /*C*/, PointerRNA *ptr)
{
uiItemR(layout, ptr, "gradient_type", UI_ITEM_R_SPLIT_EMPTY_NAME, "", ICON_NONE);
}
static void node_shader_init_tex_gradient(bNodeTree * /*ntree*/, bNode *node)
{
NodeTexGradient *tex = MEM_cnew<NodeTexGradient>(__func__);
BKE_texture_mapping_default(&tex->base.tex_mapping, TEXMAP_TYPE_POINT);
BKE_texture_colormapping_default(&tex->base.color_mapping);
tex->gradient_type = SHD_BLEND_LINEAR;
node->storage = tex;
}
static int node_shader_gpu_tex_gradient(GPUMaterial *mat,
bNode *node,
bNodeExecData * /*execdata*/,
GPUNodeStack *in,
GPUNodeStack *out)
{
node_shader_gpu_default_tex_coord(mat, node, &in[0].link);
node_shader_gpu_tex_mapping(mat, node, in, out);
NodeTexGradient *tex = (NodeTexGradient *)node->storage;
float gradient_type = tex->gradient_type;
return GPU_stack_link(mat, node, "node_tex_gradient", in, out, GPU_constant(&gradient_type));
}
class GradientFunction : public fn::MultiFunction {
private:
int gradient_type_;
public:
GradientFunction(int gradient_type) : gradient_type_(gradient_type)
{
static fn::MFSignature signature = create_signature();
this->set_signature(&signature);
}
static fn::MFSignature create_signature()
{
fn::MFSignatureBuilder signature{"GradientFunction"};
signature.single_input<float3>("Vector");
signature.single_output<ColorGeometry4f>("Color");
signature.single_output<float>("Fac");
return signature.build();
}
void call(IndexMask mask, fn::MFParams params, fn::MFContext /*context*/) const override
{
const VArray<float3> &vector = params.readonly_single_input<float3>(0, "Vector");
MutableSpan<ColorGeometry4f> r_color =
params.uninitialized_single_output_if_required<ColorGeometry4f>(1, "Color");
MutableSpan<float> fac = params.uninitialized_single_output<float>(2, "Fac");
const bool compute_color = !r_color.is_empty();
switch (gradient_type_) {
case SHD_BLEND_LINEAR: {
for (int64_t i : mask) {
fac[i] = vector[i].x;
}
break;
}
case SHD_BLEND_QUADRATIC: {
for (int64_t i : mask) {
const float r = std::max(vector[i].x, 0.0f);
fac[i] = r * r;
}
break;
}
case SHD_BLEND_EASING: {
for (int64_t i : mask) {
const float r = std::min(std::max(vector[i].x, 0.0f), 1.0f);
const float t = r * r;
fac[i] = (3.0f * t - 2.0f * t * r);
}
break;
}
case SHD_BLEND_DIAGONAL: {
for (int64_t i : mask) {
fac[i] = (vector[i].x + vector[i].y) * 0.5f;
}
break;
}
case SHD_BLEND_RADIAL: {
for (int64_t i : mask) {
fac[i] = atan2f(vector[i].y, vector[i].x) / (M_PI * 2.0f) + 0.5f;
}
break;
}
case SHD_BLEND_QUADRATIC_SPHERE: {
for (int64_t i : mask) {
/* Bias a little bit for the case where input is a unit length vector,
* to get exactly zero instead of a small random value depending
* on float precision. */
const float r = std::max(0.999999f - math::length(vector[i]), 0.0f);
fac[i] = r * r;
}
break;
}
case SHD_BLEND_SPHERICAL: {
for (int64_t i : mask) {
/* Bias a little bit for the case where input is a unit length vector,
* to get exactly zero instead of a small random value depending
* on float precision. */
fac[i] = std::max(0.999999f - math::length(vector[i]), 0.0f);
}
break;
}
}
if (compute_color) {
for (int64_t i : mask) {
r_color[i] = ColorGeometry4f(fac[i], fac[i], fac[i], 1.0f);
}
}
}
};
static void sh_node_gradient_tex_build_multi_function(NodeMultiFunctionBuilder &builder)
{
const bNode &node = builder.node();
NodeTexGradient *tex = (NodeTexGradient *)node.storage;
builder.construct_and_set_matching_fn<GradientFunction>(tex->gradient_type);
}
} // namespace blender::nodes::node_shader_tex_gradient_cc
void register_node_type_sh_tex_gradient()
{
namespace file_ns = blender::nodes::node_shader_tex_gradient_cc;
static bNodeType ntype;
sh_fn_node_type_base(&ntype, SH_NODE_TEX_GRADIENT, "Gradient Texture", NODE_CLASS_TEXTURE);
ntype.declare = file_ns::sh_node_tex_gradient_declare;
ntype.draw_buttons = file_ns::node_shader_buts_tex_gradient;
node_type_init(&ntype, file_ns::node_shader_init_tex_gradient);
node_type_storage(
&ntype, "NodeTexGradient", node_free_standard_storage, node_copy_standard_storage);
node_type_gpu(&ntype, file_ns::node_shader_gpu_tex_gradient);
ntype.build_multi_function = file_ns::sh_node_gradient_tex_build_multi_function;
nodeRegisterType(&ntype);
}
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