83 lines
3.1 KiB
C++
83 lines
3.1 KiB
C++
#include "terrain_modifier.h"
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#include "core/variant/variant.h"
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#include "macros.h"
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#include <algorithm>
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void TerrainModifier::_bind_methods() {
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BIND_HPROPERTY(Variant::INT, blend_mode, PROPERTY_HINT_ENUM, BlendMode_hint());
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BIND_PROPERTY(Variant::FLOAT, blend_distance);
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}
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float TerrainModifier::blend(float under, float over) {
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float const difference{ under - over };
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float const distance{ Math::abs(difference) };
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// .25 because we need half of each half of the blend range to be used
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float const center_distance{
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this->blend_distance == 0.f
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? 0.f
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: this->blend_distance * 0.25f - distance / this->blend_distance
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};
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if (center_distance < 0.f) {
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if (this->blend_mode == Override) {
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return over;
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} else if (this->blend_mode == Add) {
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return under > over ? under : over;
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} else {
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return under > over ? over : under;
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}
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}
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float const smooth_center_distance{ center_distance * center_distance };
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if (this->blend_mode == Override) {
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return over + smooth_center_distance;
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} else {
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return (this->blend_mode == Add
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? (under > over ? under : over) + smooth_center_distance
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: (under > over ? over : under) - smooth_center_distance);
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}
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}
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float TerrainModifier::evaluate_at(Vector2 world_coordinate, float before) {
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Vector3 const global_position{ get_global_position() };
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world_coordinate -= { global_position.x, global_position.z };
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return blend(before, 0.0);
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}
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void TerrainModifierDistance::_bind_methods() {
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BIND_HPROPERTY(Variant::OBJECT, distance_weight_curve, PROPERTY_HINT_RESOURCE_TYPE, "Curve");
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BIND_HPROPERTY(Variant::OBJECT, distance_height_curve, PROPERTY_HINT_RESOURCE_TYPE, "Curve");
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}
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float TerrainModifierDistance::distance_at(Vector2 const &world_coordinate) {
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Vector3 const global_position{ get_global_position() };
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return world_coordinate.distance_to({ global_position.x, global_position.z });
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}
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float TerrainModifierDistance::evaluate_at(Vector2 world_coordinate, float before) {
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if (this->distance_weight_curve.is_null() || this->distance_height_curve.is_null()) {
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return before;
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}
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float const distance{ distance_at(world_coordinate) };
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float const height_offset{
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std::clamp(distance, this->distance_height_curve->get_min_domain(), this->distance_height_curve->get_max_domain())
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};
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float const weight_offset{
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std::clamp(distance, this->distance_weight_curve->get_min_domain(), this->distance_weight_curve->get_max_domain())
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};
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float weight{ this->distance_weight_curve->sample_baked(weight_offset) };
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if (weight <= 0.f) {
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return before;
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} else {
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return Math::lerp(before, blend(before, this->distance_height_curve->sample_baked(height_offset) + get_global_position().y), weight);
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}
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}
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PackedStringArray TerrainModifierDistance::get_configuration_warnings() const {
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PackedStringArray warnings{ super_type::get_configuration_warnings() };
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if (this->distance_weight_curve.is_null()) {
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warnings.push_back("distance_weight_curve is invalid, add a valid distance_weight_curve");
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}
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if (this->distance_height_curve.is_null()) {
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warnings.push_back("distance_height_curve is invalid, add a valid distance_height_curve");
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}
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return warnings;
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}
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