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/* SPDX-License-Identifier: GPL-2.0-or-later */
#include "BKE_attribute_math.hh"
namespace blender::attribute_math {
ColorGeometryMixer::ColorGeometryMixer(MutableSpan<ColorGeometry4f> output_buffer,
ColorGeometry4f default_color)
: buffer_(output_buffer),
default_color_(default_color),
total_weights_(output_buffer.size(), 0.0f)
{
buffer_.fill(ColorGeometry4f(0.0f, 0.0f, 0.0f, 0.0f));
}
void ColorGeometryMixer::mix_in(const int64_t index,
const ColorGeometry4f &color,
const float weight)
{
BLI_assert(weight >= 0.0f);
ColorGeometry4f &output_color = buffer_[index];
output_color.r += color.r * weight;
output_color.g += color.g * weight;
output_color.b += color.b * weight;
output_color.a += color.a * weight;
total_weights_[index] += weight;
}
void ColorGeometryMixer::finalize()
{
for (const int64_t i : buffer_.index_range()) {
const float weight = total_weights_[i];
ColorGeometry4f &output_color = buffer_[i];
if (weight > 0.0f) {
const float weight_inv = 1.0f / weight;
output_color.r *= weight_inv;
output_color.g *= weight_inv;
output_color.b *= weight_inv;
output_color.a *= weight_inv;
}
else {
output_color = default_color_;
}
}
}
} // namespace blender::attribute_math
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