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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2005 Blender Foundation. All rights reserved. */
/** \file
* \ingroup shdnodes
*/
#include "DNA_texture_types.h"
#include "BLI_color.hh"
#include "node_shader_util.hh"
namespace blender::nodes::node_shader_color_ramp_cc {
static void sh_node_valtorgb_declare(NodeDeclarationBuilder &b)
{
b.is_function_node();
b.add_input<decl::Float>(N_("Fac")).default_value(0.5f).min(0.0f).max(1.0f).subtype(PROP_FACTOR);
b.add_output<decl::Color>(N_("Color"));
b.add_output<decl::Float>(N_("Alpha"));
}
static void node_shader_init_valtorgb(bNodeTree * /*ntree*/, bNode *node)
{
node->storage = BKE_colorband_add(true);
}
static int gpu_shader_valtorgb(GPUMaterial *mat,
bNode *node,
bNodeExecData * /*execdata*/,
GPUNodeStack *in,
GPUNodeStack *out)
{
struct ColorBand *coba = (ColorBand *)node->storage;
float *array, layer;
int size;
/* Common / easy case optimization. */
if ((coba->tot <= 2) && (coba->color_mode == COLBAND_BLEND_RGB)) {
float mul_bias[2];
switch (coba->ipotype) {
case COLBAND_INTERP_LINEAR:
mul_bias[0] = 1.0f / (coba->data[1].pos - coba->data[0].pos);
mul_bias[1] = -mul_bias[0] * coba->data[0].pos;
return GPU_stack_link(mat,
node,
"valtorgb_opti_linear",
in,
out,
GPU_uniform(mul_bias),
GPU_uniform(&coba->data[0].r),
GPU_uniform(&coba->data[1].r));
case COLBAND_INTERP_CONSTANT:
mul_bias[1] = max_ff(coba->data[0].pos, coba->data[1].pos);
return GPU_stack_link(mat,
node,
"valtorgb_opti_constant",
in,
out,
GPU_uniform(&mul_bias[1]),
GPU_uniform(&coba->data[0].r),
GPU_uniform(&coba->data[1].r));
case COLBAND_INTERP_EASE:
mul_bias[0] = 1.0f / (coba->data[1].pos - coba->data[0].pos);
mul_bias[1] = -mul_bias[0] * coba->data[0].pos;
return GPU_stack_link(mat,
node,
"valtorgb_opti_ease",
in,
out,
GPU_uniform(mul_bias),
GPU_uniform(&coba->data[0].r),
GPU_uniform(&coba->data[1].r));
default:
break;
}
}
BKE_colorband_evaluate_table_rgba(coba, &array, &size);
GPUNodeLink *tex = GPU_color_band(mat, size, array, &layer);
if (coba->ipotype == COLBAND_INTERP_CONSTANT) {
return GPU_stack_link(mat, node, "valtorgb_nearest", in, out, tex, GPU_constant(&layer));
}
return GPU_stack_link(mat, node, "valtorgb", in, out, tex, GPU_constant(&layer));
}
class ColorBandFunction : public fn::MultiFunction {
private:
const ColorBand &color_band_;
public:
ColorBandFunction(const ColorBand &color_band) : color_band_(color_band)
{
static fn::MFSignature signature = create_signature();
this->set_signature(&signature);
}
static fn::MFSignature create_signature()
{
fn::MFSignatureBuilder signature{"Color Band"};
signature.single_input<float>("Value");
signature.single_output<ColorGeometry4f>("Color");
signature.single_output<float>("Alpha");
return signature.build();
}
void call(IndexMask mask, fn::MFParams params, fn::MFContext /*context*/) const override
{
const VArray<float> &values = params.readonly_single_input<float>(0, "Value");
MutableSpan<ColorGeometry4f> colors = params.uninitialized_single_output<ColorGeometry4f>(
1, "Color");
MutableSpan<float> alphas = params.uninitialized_single_output<float>(2, "Alpha");
for (int64_t i : mask) {
ColorGeometry4f color;
BKE_colorband_evaluate(&color_band_, values[i], color);
colors[i] = color;
alphas[i] = color.a;
}
}
};
static void sh_node_valtorgb_build_multi_function(nodes::NodeMultiFunctionBuilder &builder)
{
const bNode &bnode = builder.node();
const ColorBand *color_band = (const ColorBand *)bnode.storage;
builder.construct_and_set_matching_fn<ColorBandFunction>(*color_band);
}
} // namespace blender::nodes::node_shader_color_ramp_cc
void register_node_type_sh_valtorgb()
{
namespace file_ns = blender::nodes::node_shader_color_ramp_cc;
static bNodeType ntype;
sh_fn_node_type_base(&ntype, SH_NODE_VALTORGB, "ColorRamp", NODE_CLASS_CONVERTER);
ntype.declare = file_ns::sh_node_valtorgb_declare;
node_type_init(&ntype, file_ns::node_shader_init_valtorgb);
node_type_size_preset(&ntype, NODE_SIZE_LARGE);
node_type_storage(&ntype, "ColorBand", node_free_standard_storage, node_copy_standard_storage);
node_type_gpu(&ntype, file_ns::gpu_shader_valtorgb);
ntype.build_multi_function = file_ns::sh_node_valtorgb_build_multi_function;
nodeRegisterType(&ntype);
}
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