feat: started work on terrain editor tools

modules/terrain/terrain.cpp

@@ -0,0 +1,80 @@
+#include "terrain.h"
+#include "terrain/terrain_chunk.h"
+#include "terrain/terrain_modifier.h"
+
+void Terrain::_bind_methods() {}
+
+void Terrain::ready() {
+	construct_chunk_grid();
+	generate_meshes();
+}
+
+void Terrain::update_modifier_list() {
+	this->modifiers.clear();
+	for (Variant var : get_children()) {
+		if (TerrainModifier * mod{ cast_to<TerrainModifier>(var) }) {
+			this->modifiers.push_back(mod);
+		}
+	}
+}
+
+void Terrain::construct_chunk_grid() {
+	size_t const chunks_per_side{ this->side_length / this->chunk_size };
+	Vector3 const origin{ -(float)chunks_per_side / 2.f * (float)this->chunk_size, 0.f, -(float)chunks_per_side / 2.f * (float)this->chunk_size };
+	for (size_t y{ 0 }; y < chunks_per_side; ++y) {
+		for (size_t x{ 0 }; x < chunks_per_side; ++x) {
+			TerrainChunkMesh *chunk{ memnew(TerrainChunkMesh) };
+			chunk->set_size(this->chunk_size);
+			chunk->set_detail(this->detail);
+			chunk->set_terrain(this);
+			chunk->set_position(origin + Vector3{ (float)this->chunk_size * (float)x, 0.f, (float)this->chunk_size * (float)y });
+			add_child(chunk);
+			chunk->set_owner(this);
+			this->meshes.push_back(chunk);
+		}
+	}
+}
+
+void Terrain::generate_meshes() {
+	for (TerrainChunkMesh *mesh : this->meshes) {
+		mesh->update_mesh();
+	}
+}
+
+void Terrain::child_entered(Node *node) {
+	if (cast_to<TerrainModifier>(node)) {
+		update_modifier_list();
+	}
+}
+
+void Terrain::child_exiting(Node *node) {
+	if (TerrainModifier * mod{ cast_to<TerrainModifier>(node) }) {
+		this->modifiers.erase(mod);
+	}
+}
+
+void Terrain::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_ENTER_TREE:
+			if (!is_ready()) {
+				connect("child_entered_tree", callable_mp(this, &self_type::child_entered));
+				connect("child_exiting_tree", callable_mp(this, &self_type::child_exiting));
+				connect("child_order_changed", callable_mp(this, &self_type::update_modifier_list));
+			}
+			return;
+			return;
+		case NOTIFICATION_READY:
+			ready();
+			return;
+	}
+}
+
+float Terrain::height_at(Vector2 world_coordinate) {
+	float height{ 0 };
+	for (TerrainModifier *mod : this->modifiers) {
+		height = mod->evaluate_at(world_coordinate, height);
+	}
+	return height;
+}