feat: implemented chunking

modules/terrain_editor/terrain_mesh_generator.cpp

@@ -2,9 +2,11 @@
 #include "core/math/math_funcs.h"
 #include "core/math/rect2.h"
 #include "core/object/class_db.h"
+#include "core/object/object.h"
 #include "core/templates/local_vector.h"
 #include "scene/resources/surface_tool.h"
 #include "terrain_editor/macros.h"
+#include "terrain_editor/terrain_chunk.h"
 #include "terrain_editor/terrain_primitive.h"
 #include <limits>
 
@@ -16,15 +18,55 @@ void TerrainMeshGenerator::_bind_methods() {
 	BIND_HPROPERTY(Variant::OBJECT, vertex_color_gradient, PROPERTY_HINT_RESOURCE_TYPE, "Gradient");
 	BIND_PROPERTY(Variant::FLOAT, color_gradient_start_height);
 	BIND_PROPERTY(Variant::FLOAT, color_gradient_end_height);
+	BIND_PROPERTY(Variant::FLOAT, chunk_size);
+	BIND_PROPERTY(Variant::INT, lod1_detail);
+	BIND_PROPERTY(Variant::INT, chunk_count);
+	BIND_HPROPERTY(Variant::OBJECT, material, PROPERTY_HINT_RESOURCE_TYPE, "Material");
 	ADD_SIGNAL(MethodInfo(sig_primitives_changed));
 	ADD_SIGNAL(MethodInfo(sig_primitive_list_changed, PropertyInfo(Variant::ARRAY, "array", PROPERTY_HINT_ARRAY_TYPE, vformat("%s/%s:TerrainPrimitive", Variant::OBJECT, PROPERTY_HINT_RESOURCE_TYPE))));
 	ClassDB::bind_method(D_METHOD("generate_grid", "area", "out_mesh", "side_points"), &self_type::generate_grid);
 }
 
+void TerrainMeshGenerator::ready() {
+	if (this->chunks.is_empty()) {
+		rebuild_chunks();
+	}
+}
+
 void TerrainMeshGenerator::on_configuration_changed() {
 	emit_signal(sig_primitives_changed);
 }
 
+void TerrainMeshGenerator::_notification(int what) {
+	switch (what) {
+		default:
+			return;
+		case NOTIFICATION_READY:
+			ready();
+			return;
+	}
+}
+
+void TerrainMeshGenerator::rebuild_chunks() {
+	for (TerrainChunk *chunk : this->chunks) {
+		chunk->queue_free();
+	}
+	this->chunks.clear();
+	Vector3 origin{ -Vector3{ (float)chunks_per_side, 0, (float)chunks_per_side } * this->chunk_size / 2 };
+	for (size_t chunk_y{ 0 }; chunk_y < this->chunks_per_side; ++chunk_y) {
+		for (size_t chunk_x{ 0 }; chunk_x < this->chunks_per_side; ++chunk_x) {
+			TerrainChunk *chunk{ memnew(TerrainChunk) };
+			chunk->set_size(this->chunk_size);
+			chunk->set_lod1_detail(this->lod1_detail);
+			chunk->set_material_override(this->material);
+			this->chunks.push_back(chunk);
+			Vector3 offset{ Vector3{ (float)chunk_x, 0.f, (float)chunk_y } * this->chunk_size };
+			chunk->set_position(origin + offset);
+			add_child(chunk);
+		}
+	}
+}
+
 Color TerrainMeshGenerator::color_at_height(float height) const {
 	float const mapped{ Math::remap(height, this->color_gradient_start_height, this->color_gradient_end_height, 0.f, 1.f) };
 	return this->vertex_color_gradient.is_valid()
@@ -69,6 +111,7 @@ void TerrainMeshGenerator::generate_grid(Rect2 area, Ref<ArrayMesh> mesh, size_t
 	mesh->clear_surfaces();
 	surface->clear();
 	Vector2 point_distance{ area.size / (float)side_points };
+	++side_points;
 	Vector2 at{ area.position };
 	surface->begin(Mesh::PRIMITIVE_TRIANGLES);
 	for (size_t xpoint{ 0 }; xpoint < side_points; ++xpoint) {
@@ -76,7 +119,7 @@ void TerrainMeshGenerator::generate_grid(Rect2 area, Ref<ArrayMesh> mesh, size_t
 			float const height{ evaluate_point(at) };
 			surface->set_color(color_at_height(height));
 			surface->set_uv({ at / area.size });
-			surface->add_vertex({ at.x, height, at.y });
+			surface->add_vertex({ at.x - area.position.x, height, at.y - area.position.y });
 			at.y += point_distance.y;
 		}
 		at.y = area.position.y;
@@ -150,3 +193,42 @@ void TerrainMeshGenerator::set_color_gradient_end_height(float value) {
 float TerrainMeshGenerator::get_color_gradient_end_height() const {
 	return this->color_gradient_end_height;
 }
+
+void TerrainMeshGenerator::set_chunk_size(float size) {
+	this->chunk_size = size;
+	rebuild_chunks();
+}
+float TerrainMeshGenerator::get_chunk_size() const {
+	return this->chunk_size;
+}
+void TerrainMeshGenerator::set_lod1_detail(int detail) {
+	if (detail != this->lod1_detail) {
+		this->lod1_detail = detail;
+		rebuild_chunks();
+	}
+}
+int TerrainMeshGenerator::get_lod1_detail() const {
+	return this->lod1_detail;
+}
+
+void TerrainMeshGenerator::set_chunk_count(int num) {
+	if (num != this->chunks_per_side) {
+		this->chunks_per_side = num;
+		rebuild_chunks();
+	}
+}
+
+int TerrainMeshGenerator::get_chunk_count() const {
+	return this->chunks_per_side;
+}
+
+void TerrainMeshGenerator::set_material(Ref<Material> material) {
+	this->material = material;
+	for (TerrainChunk *chunk : this->chunks) {
+		chunk->set_material_override(material);
+	}
+}
+
+Ref<Material> TerrainMeshGenerator::get_material() const {
+	return this->material;
+}