fiddling around with far pointers, page headers somewhat solid

include/map/Octree.h

@@ -18,11 +18,13 @@ struct oct_state {
 
 };
 
+
 class Octree {
 public:
 
 	static const int buffer_size = 100000;
 
+
 	Octree();
 	~Octree() {};
 
@@ -30,12 +32,23 @@ public:
 	void Load(std::string octree_file_name);
 	
 	uint64_t *trunk_buffer				= new uint64_t[buffer_size]{0};
+	uint64_t trunk_buffer_position		= buffer_size;
+
 	uint64_t *descriptor_buffer			= new uint64_t[buffer_size]{0};
+	uint64_t descriptor_buffer_position = buffer_size;
+
 	uint32_t *attachment_lookup			= new uint32_t[buffer_size]{0};
+	uint64_t attachment_lookup_position = buffer_size;
+
 	uint64_t *attachment_buffer			= new uint64_t[buffer_size]{0};
+	uint64_t attachment_buffer_position = buffer_size;
 
 	unsigned int trunk_cutoff = 3;
 	uint64_t root_index = 0;
+
+	int page_header_counter = 0x8000;
+	uint64_t current_info_section_position = buffer_size - 50;
+
 	uint64_t stack_pos = 0x8000;
 	uint64_t global_pos = buffer_size - 50;
 
@@ -49,7 +62,12 @@ public:
 
 private:
 
-	std::tuple<uint64_t, uint64_t> GenerationRecursion(char* data, sf::Vector3i dimensions, sf::Vector3i pos, unsigned int voxel_scale);
+	std::tuple<uint64_t, uint64_t> GenerationRecursion(
+		char* data,					// raw octree data
+		sf::Vector3i dimensions,	// dimensions of the raw data
+		sf::Vector3i pos,			// position of this generation node
+		unsigned int voxel_scale	// the voxel scale of this node
+	); 
 
 	static char get1DIndexedVoxel(char* data, sf::Vector3i dimensions, sf::Vector3i position);
 

src/map/Octree.cpp

@@ -271,16 +271,46 @@ std::tuple<uint64_t, uint64_t> Octree::GenerationRecursion(char* data, sf::Vecto
 	// We are working bottom up so we need to subtract from the stack position
 	// the amount of elements we want to use
 
-	 for (auto desc_pos: descriptor_position_array) {
+
+	int worst_case_insertion_size = descriptor_position_array.size() * 2;
+
+	// check to see if we exceeded this page header, if so set the header and move the global position
+	if (page_header_counter - worst_case_insertion_size <= 0) {
+		
+		// Jump to the page headers position and reset the counter
+		descriptor_buffer_position -= 0x8000 - page_header_counter;
+		page_header_counter = 0x8000;
+
+		// Fill the space with blank
+		memcpy(&descriptor_buffer[descriptor_buffer_position], &current_info_section_position, sizeof(uint64_t));
+
+		descriptor_buffer_position--;
 
 	} 
 
-	if (stack_pos - descriptor_array.size() > stack_pos) {
-		global_pos = stack_pos;
+	// We gotta go backwards as memcpy of a vector can be emulated by starting from the rear
+	for (int i = descriptor_position_array.size() - 1; i >= 0; i--) {
+		
+		uint64_t relative_distance = std::get<1>(descriptor_position_array.at(i)) - descriptor_buffer_position;
+
+		// check to see if the 
+		if (relative_distance > 0x8000) {
+			memcpy(&descriptor_buffer[descriptor_buffer_position], &std::get<1>(descriptor_position_array.at(i)), sizeof(uint64_t));
+			descriptor_buffer_position--;
+		}
+
+		memcpy(&descriptor_buffer[descriptor_buffer_position], descriptor_position_array.at(i), descriptor_array.size() * sizeof(uint64_t));
+
+	}
+
+	
+	
+	if (stack_pos - descriptor_position_array.size() > stack_pos) {
+		global_pos -= stack_pos;
 		stack_pos = 0x8000;
 	}
 	else {
-		stack_pos -= descriptor_array.size();
+		stack_pos -= descriptor_position_array.size();
 	}