restore seamless chunk borders

restores blockpicking with new multithread system

CMakeLists.txt

@@ -3,8 +3,8 @@ cmake_minimum_required(VERSION 3.2)
 project(cmake-project-template)
 
 set(CMAKE_CXX_STANDARD 17)
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -O3")
+#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -O3")
-#set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11 -g")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++17 -g")
 
 set(CMAKE_INSTALL_PREFIX ${PROJECT_SOURCE_DIR})
 

include/camera.hpp

@@ -8,6 +8,9 @@
 
 #include <atomic>
 
+#include "chunk.hpp"
+#include "debugwindow.hpp"
+
 class Camera
 {
 
@@ -18,6 +21,10 @@ public:
 
 	// This matrix needs to be also updated in viewPortCallback whenever it is changed
         projection = glm::perspective(glm::radians(90.0f), 800.0f / 600.0f, 0.1f, 1200.0f);
+
+	posX = cameraPos.x;
+	posY = cameraPos.y;
+	posZ = cameraPos.z;
     }
 
     void update(GLFWwindow *window, float deltaTime)
@@ -48,6 +55,16 @@ public:
         cameraFront = glm::normalize(direction);
 
         view = glm::lookAt(cameraPos, cameraPos + cameraFront, cameraUp);
+
+	debug::window::set_parameter("px", cameraPos.x);
+	debug::window::set_parameter("py", cameraPos.y);
+	debug::window::set_parameter("pz", cameraPos.z);
+	debug::window::set_parameter("cx", (int)(cameraPos.x / CHUNK_SIZE));
+	debug::window::set_parameter("cy", (int)(cameraPos.y / CHUNK_SIZE));
+	debug::window::set_parameter("cz", (int)(cameraPos.z / CHUNK_SIZE));
+	debug::window::set_parameter("lx", cameraFront.x);
+	debug::window::set_parameter("ly", cameraFront.y);
+	debug::window::set_parameter("lz", cameraFront.z);
     }
 
     void viewPortCallBack(GLFWwindow *window, int width, int height)
@@ -112,7 +129,7 @@ public:
 
 
 private:
-    glm::vec3 cameraPos = glm::vec3(256.0, 80.0f, 256.0f);
+    glm::vec3 cameraPos = glm::vec3(512.0, 256.0f, 512.0f);
     glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -1.0f);
     glm::vec3 cameraUp = glm::vec3(0.0f, 1.0f, 0.0f);
     glm::vec3 direction = glm::vec3(0.0f);

include/chunk.hpp

@@ -23,31 +23,35 @@
 namespace Chunk
 {
 
-    constexpr uint8_t CHUNK_STATE_GENERATED = 1;
+    constexpr uint16_t CHUNK_STATE_GENERATED = 1;
-    constexpr uint8_t CHUNK_STATE_MESHED = 2;
+    constexpr uint16_t CHUNK_STATE_MESHED = 2;
-    constexpr uint8_t CHUNK_STATE_MESH_LOADED = 4;
+    constexpr uint16_t CHUNK_STATE_OUTOFVISION = 4;
-    constexpr uint8_t CHUNK_STATE_LOADED = 8;
+    constexpr uint16_t CHUNK_STATE_UNLOADED = 8;
-    constexpr uint8_t CHUNK_STATE_OUTOFVISION = 16;
+    constexpr uint16_t CHUNK_STATE_EMPTY = 16;
-    constexpr uint8_t CHUNK_STATE_UNLOADED = 32;
+    constexpr uint16_t CHUNK_STATE_IN_GENERATION_QUEUE = 32;
-    constexpr uint8_t CHUNK_STATE_EMPTY = 64;
+    constexpr uint16_t CHUNK_STATE_IN_MESHING_QUEUE = 64;
+    constexpr uint16_t CHUNK_STATE_IN_DELETING_QUEUE = 128;
 
     int coord3DTo1D(int x, int y, int z);
+    int32_t calculateIndex(int16_t x, int16_t y, int16_t z);
+    int32_t calculateIndex(glm::vec3 pos);
 
     class Chunk
     {
 
     public:
         Chunk(glm::vec3 pos = glm::vec3(0.0f)); // a default value for the argument satisfies the need for a default constructor when using the type in an unordered_map (i.e. in chunkmanager)
-        ~Chunk();
 
     public:
 	void createBuffers();
 	void deleteBuffers();
 
         glm::vec3 getPosition() { return this->position; }
-        uint8_t getTotalState() { return this->state; }
+        void setState(uint16_t nstate, bool value);
-        bool getState(uint8_t n) { return (this->state & n) == n; }
+	uint16_t getTotalState() { return this->state; }
-        void setState(uint8_t nstate, bool value);
+        bool getState(uint16_t n) { return (this->state & n) == n; }
+	bool isFree(){ return !(getState(CHUNK_STATE_IN_GENERATION_QUEUE) ||
+		getState(CHUNK_STATE_IN_MESHING_QUEUE)); }
 
         void setBlock(Block b, int x, int y, int z);
         void setBlocks(int start, int end, Block b);
@@ -58,12 +62,15 @@ namespace Chunk
     public:
         GLuint VAO{0}, VBO{0}, extentsBuffer{0}, texinfoBuffer{0}, numVertices{0};
 	std::atomic<float> unload_timer{0};
+	// uint32_t is fine, since i'm limiting the coordinate to only use up to ten bits (1023). There's actually two spare bits
+	int32_t getIndex(){ return index; }
 
     private:
         glm::vec3 position{};
         IntervalMap<Block> blocks{};
         
-	std::atomic_uint8_t state{0};
+	int32_t index;
+	std::atomic_uint16_t state{0};
     };
 };
 

include/chunkmanager.hpp

@@ -1,17 +1,19 @@
 #ifndef CHUNKMANAGER_H
 #define CHUNKMANAGER_H
 
-#include "chunk.hpp"
-
 #include <oneapi/tbb/concurrent_hash_map.h>
 #include <oneapi/tbb/concurrent_queue.h>
 #include <oneapi/tbb/concurrent_priority_queue.h>
+
+#include <unordered_map>
 #include <thread>
 
+#include "chunk.hpp"
 #include "globals.hpp"
+#include "worldupdatemessage.h"
 
 // Seconds to be passed outside of render distance for a chunk to be destroyed
-#define UNLOAD_TIMEOUT 10
+#define UNLOAD_TIMEOUT 5
 
 #define	MESHING_PRIORITY_NORMAL 0
 #define MESHING_PRIORITY_PLAYER_EDIT 10
@@ -19,7 +21,10 @@
 
 namespace chunkmanager
 {
-    typedef oneapi::tbb::concurrent_hash_map<uint32_t, Chunk::Chunk*> ChunkTable;
+    typedef oneapi::tbb::concurrent_hash_map<int32_t, Chunk::Chunk*> ChunkTable;
+    typedef oneapi::tbb::concurrent_queue<int> IntQueue;
+
+    //typedef std::unordered_map<int32_t, Chunk::Chunk*> ChunkTable;
     typedef std::pair<Chunk::Chunk*, uint8_t> ChunkPQEntry;
     // The comparing function to use
     struct compare_f {
@@ -30,15 +35,12 @@ namespace chunkmanager
     typedef oneapi::tbb::concurrent_priority_queue<ChunkPQEntry, compare_f> ChunkPriorityQueue;
 
     void init();
-    void blockpick(bool place);
+    void update();
-    uint32_t calculateIndex(uint16_t i, uint16_t j, uint16_t k);
-    
     void stop();
     void destroy();
-    oneapi::tbb::concurrent_queue<Chunk::Chunk*>& getDeleteVector();
+    WorldUpdateMsgQueue& getWorldUpdateQueue();
-    std::array<std::array<int, 3>, chunks_volume>& getChunksIndices();
+    std::array<std::array<int16_t, 3>, chunks_volume>& getChunksIndices();
     Block getBlockAtPos(int x, int y, int z);
-    void update();
 }
 
 #endif

include/chunkmeshdata.hpp

@@ -0,0 +1,32 @@
+#ifndef CHUNK_MESH_DATA_H
+#define CHUNK_MESH_DATA_H
+
+enum class ChunkMeshDataType{
+    MESH_UPDATE
+};
+
+typedef struct ChunkMeshData{
+    int32_t index;
+    glm::vec3 position;
+    int num_vertices = 0;
+
+    std::vector<GLfloat> vertices;
+    std::vector<GLfloat> extents;
+    std::vector<GLfloat> texinfo;
+    
+    ChunkMeshDataType message_type;
+
+    void clear(){
+	vertices.clear();
+	texinfo.clear();
+	extents.clear();
+	index = 0;
+	position = glm::vec3(0);
+	num_vertices = 0;
+    }
+
+}ChunkMeshData;
+typedef oneapi::tbb::concurrent_queue<ChunkMeshData*> ChunkMeshDataQueue;
+
+
+#endif

include/chunkmesher.hpp

@@ -5,28 +5,19 @@
 #include <vector>
 
 #include <glad/glad.h>
+#include <glm/glm.hpp>
 #include <GLFW/glfw3.h>
 #include <oneapi/tbb/concurrent_queue.h>
 
 #include "chunk.hpp"
+#include "chunkmeshdata.hpp"
 #include "globals.hpp"
 #include "shader.hpp"
 
 namespace chunkmesher{
-    struct MeshData{
+    ChunkMeshDataQueue& getMeshDataQueue();
-	Chunk::Chunk* chunk; 
+    void init();
-	GLuint numVertices{0};
-
-	std::vector<GLfloat> vertices;
-	std::vector<GLfloat> extents;
-	std::vector<GLfloat> texinfo;
-    };
-    oneapi::tbb::concurrent_queue<MeshData*>& getMeshDataQueue();
-
     void mesh(Chunk::Chunk* chunk);
-    void sendtogpu(MeshData* mesh_data);
-    void quad(MeshData* mesh_data, glm::vec3 bottomLeft, glm::vec3 topLeft, glm::vec3 topRight,
-	    glm::vec3 bottomRight, glm::vec3 normal, Block block, int dim, bool backFace);
 }
 
 

include/controls.hpp

@@ -0,0 +1,18 @@
+#ifndef CONTROLS_H
+#define CONTROLS_H
+
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
+#include "worldupdatemessage.h"
+
+#define BLOCKPICK_TIMEOUT 0.1f
+
+namespace controls{
+    void init();
+    void update(GLFWwindow* window);
+
+    WorldUpdateMsgQueue& getWorldUpdateQueue();
+};
+
+#endif

include/globals.hpp

@@ -10,10 +10,11 @@
 #define extr extern
 #endif
 
-#define RENDER_DISTANCE 16
+#define RENDER_DISTANCE 8
 
 extr Camera theCamera;
-constexpr int chunks_volume = static_cast<int>(1.333333333333*M_PI*(RENDER_DISTANCE*RENDER_DISTANCE*RENDER_DISTANCE));
+//constexpr int chunks_volume = static_cast<int>(1.333333333333*M_PI*(RENDER_DISTANCE*RENDER_DISTANCE*RENDER_DISTANCE));
+constexpr int chunks_volume = RENDER_DISTANCE*RENDER_DISTANCE*RENDER_DISTANCE*8;
 extr bool wireframe;
 
 extr float sines[360];

include/main.hpp

@@ -3,6 +3,5 @@
 
 void framebuffer_size_callback(GLFWwindow *, int, int);
 void mouse_callback(GLFWwindow *window, double xpos, double ypos);
-void processInput(GLFWwindow *);
 
 #endif

include/renderer.hpp

@@ -1,17 +1,47 @@
 #ifndef RENDERER_H
 #define RENDERER_H
 
-#include <oneapi/tbb/concurrent_unordered_set.h>
+#include <glm/glm.hpp>
-#include <oneapi/tbb/concurrent_queue.h>
 
 #include "chunk.hpp"
 #include "chunkmesher.hpp"
+#include "chunkmeshdata.hpp"
 #include "shader.hpp"
 
 namespace renderer{
-    typedef oneapi::tbb::concurrent_unordered_set<Chunk::Chunk*> RenderSet;
+    typedef struct RenderInfo {
+	int32_t index;
+	int num_vertices;
+	glm::vec3 position;
+	bool buffers_allocated=false;
+
+	GLuint VAO, VBO, extentsBuffer, texinfoBuffer;
+
+	void allocateBuffers(){
+	    // Allocate buffers
+	    glGenVertexArrays(1, &VAO);
+	    glGenBuffers(1, &VBO);
+	    glGenBuffers(1, &extentsBuffer);
+	    glGenBuffers(1, &texinfoBuffer);
+
+	    buffers_allocated=true;
+	}
+
+	void deallocateBuffers(){
+	    // Allocate buffers
+	    glDeleteBuffers(1, &VBO);
+	    glDeleteBuffers(1, &extentsBuffer);
+	    glDeleteBuffers(1, &texinfoBuffer);
+	    glDeleteVertexArrays(1, &VAO);
+
+	    buffers_allocated=false;
+	}
+    } RenderInfo;
+
+    typedef oneapi::tbb::concurrent_queue<int32_t> IndexQueue;
 
     void init(GLFWwindow* window);
+    void send_chunk_to_gpu(ChunkMeshData* mesh_data, RenderInfo* render_info);
     void render();
     void resize_framebuffer(int width, int height);
     void framebuffer_size_callback(GLFWwindow *window, int width, int height);
@@ -20,8 +50,8 @@ namespace renderer{
     void saveScreenshot(bool forceFullHD=false);
 
     Shader* getRenderShader();
-    RenderSet& getChunksToRender();
+    ChunkMeshDataQueue& getMeshDataQueue();
-    oneapi::tbb::concurrent_queue<chunkmesher::MeshData*>& getMeshDataQueue();
+    IndexQueue& getDeleteIndexQueue();
 
 };
 

include/worldupdatemessage.h

@@ -0,0 +1,21 @@
+#ifndef WORLD_UPDATE_MSG_H
+#define WORLD_UPDATE_MSG_H
+
+#include <glm/glm.hpp>
+#include <oneapi/tbb/concurrent_queue.h>
+
+enum class WorldUpdateMsgType{
+    BLOCKPICK_PLACE,
+    BLOCKPICK_BREAK
+};
+
+typedef struct WorldUpdateMsg{
+    WorldUpdateMsgType msg_type;
+    glm::vec3 cameraPos;
+    glm::vec3 cameraFront;
+    float time;
+} WorldUpdateMsg;
+
+typedef oneapi::tbb::concurrent_queue<WorldUpdateMsg> WorldUpdateMsgQueue;
+
+#endif

src/CMakeLists.txt

@@ -1,10 +1,10 @@
 cmake_minimum_required(VERSION 3.2)
 project(OpenGLTest)
 
-set(SOURCE_FILES main.cpp chunk.cpp chunkmanager.cpp chunkmesher.cpp chunkgenerator.cpp
+set(SOURCE_FILES main.cpp controls.cpp chunk.cpp chunkmanager.cpp chunkmesher.cpp chunkgenerator.cpp
 	debugwindow.cpp renderer.cpp spacefilling.cpp stb_image.cpp utils.cpp OpenSimplexNoise.cpp)
 
 add_executable(OpenGLTest ${SOURCE_FILES})
 
 target_link_libraries(OpenGLTest glfw tbb glad glm imgui)
-install(TARGETS OpenGLTest DESTINATION ${DIVISIBLE_INSTALL_BIN_DIR})
+install(TARGETS OpenGLTest DESTINATION)

src/chunk.cpp

@@ -15,30 +15,20 @@ namespace Chunk
         return utils::coord3DTo1D(x, y, z, CHUNK_SIZE, CHUNK_SIZE, CHUNK_SIZE);
     }
 
+    int32_t calculateIndex(glm::vec3 pos){
+	return calculateIndex(static_cast<int16_t>(pos.x), static_cast<int16_t>(pos.y),
+		static_cast<int16_t>(pos.z));
+    }
+    int32_t calculateIndex(int16_t x, int16_t y, int16_t z){
+	return x | (y << 10) | (z << 20); 
+    }
+
     Chunk::Chunk(glm::vec3 pos)
     {
         this->position = pos;
         this->setState(CHUNK_STATE_EMPTY, true);
 	this->setBlocks(0, CHUNK_MAX_INDEX, Block::AIR);
-    }
+	this->index = calculateIndex(pos);
-
-    Chunk ::~Chunk()
-    {
-    }
-
-    void Chunk::createBuffers(){
-	glGenVertexArrays(1, &(this->VAO));
-	glGenBuffers(1, &(this->VBO));
-	glGenBuffers(1, &(this->extentsBuffer));
-	glGenBuffers(1, &(this->texinfoBuffer));
-
-    }
-
-    void Chunk::deleteBuffers(){
-	glDeleteBuffers(1, &(this->VBO));
-	glDeleteBuffers(1, &(this->extentsBuffer));
-	glDeleteBuffers(1, &(this->texinfoBuffer));
-        glDeleteVertexArrays(1, &(this->VAO));
     }
 
     Block Chunk::getBlock(int x, int y, int z)
@@ -59,7 +49,7 @@ namespace Chunk
         this->blocks.insert(start < 0 ? 0 : start, end >= CHUNK_VOLUME ? CHUNK_VOLUME : end, b);
     }
 
-    void Chunk::setState(uint8_t nstate, bool value)
+    void Chunk::setState(uint16_t nstate, bool value)
     {
         if (value)
 	    this->state.fetch_or(nstate);

src/chunkgenerator.cpp

@@ -63,9 +63,9 @@ std::array<TreeCellInfo, TREE_LUT_SIZE*TREE_LUT_SIZE> treeLUT;
 
 void generateNoise(Chunk::Chunk *chunk)
 {
-    int cx = chunk->getPosition().x * CHUNK_SIZE;
+    int cx = static_cast<int>(chunk->getPosition().x) * CHUNK_SIZE;
-    int cy = chunk->getPosition().y * CHUNK_SIZE;
+    int cy = static_cast<int>(chunk->getPosition().y) * CHUNK_SIZE;
-    int cz = chunk->getPosition().z * CHUNK_SIZE;
+    int cz = static_cast<int>(chunk->getPosition().z) * CHUNK_SIZE;
 
     // Precalculate LUTs
 

src/chunkmanager.cpp

@@ -1,11 +1,15 @@
 #include "chunkmanager.hpp"
 
+#include <oneapi/tbb.h>
+
 #include <atomic>
 #include <math.h>
-#include <vector>
+#include <queue>
 #include <thread>
 
 #include <glm/glm.hpp>
+#include <glm/ext.hpp>
+#include <glm/gtx/string_cast.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 
 #include "block.hpp"
@@ -18,13 +22,21 @@
 
 namespace chunkmanager
 {
+    void blockpick(WorldUpdateMsg& msg); // There's no need of passing by value again (check
+					 // controls.cpp)
     void generate();
     void mesh();
 
+    /* Chunk holding data structures */
     // Concurrent hash table of chunks
     ChunkTable chunks;
+    // Concurrent queue for chunks to be deleted
+    IntQueue chunks_todelete;
     // Chunk indices. Centered at (0,0,0), going in concentric sphere outwards
-    std::array<std::array<int, 3>, chunks_volume> chunks_indices;
+    std::array<std::array<int16_t, 3>, chunks_volume> chunks_indices;
+
+    /* World Update messaging data structure */
+    WorldUpdateMsgQueue WorldUpdateQueue;
 
     /* Multithreading */
     std::atomic_bool should_run;
@@ -34,54 +46,27 @@ namespace chunkmanager
     // Queue of chunks to be meshed
     ChunkPriorityQueue chunks_to_mesh_queue;
 
+    /* Block picking */
     int block_to_place{2};
 
+    WorldUpdateMsgQueue& getWorldUpdateQueue(){ return WorldUpdateQueue; }
+    
     // Init chunkmanager. Chunk indices and start threads
-    int chunks_volume_real;
     void init(){
 	int index{0};
-	int rr{RENDER_DISTANCE * RENDER_DISTANCE};
+	constexpr int rr{RENDER_DISTANCE * RENDER_DISTANCE};
 
-        int xp{0}, x{0};
         bool b = true;
 
-        // Iterate over all chunks, in concentric spheres starting fron the player and going outwards. Alternate left and right
+	for(int16_t i = -RENDER_DISTANCE; i < RENDER_DISTANCE; i++)
-        // Eq. of the sphere (x - a)² + (y - b)² + (z - c)² = r²
+	    for(int16_t j = -RENDER_DISTANCE; j < RENDER_DISTANCE; j++)
-        while (xp <= RENDER_DISTANCE)
+		for(int16_t k = -RENDER_DISTANCE; k < RENDER_DISTANCE; k++){
-        {
-	    // Alternate between left and right
-            if (b) x = +xp;
-            else x = -xp;
 
-	    // Step 1. At current x, get the corresponding y values (2nd degree equation, up to 2
+		    chunks_indices[index][0]=i;
-	    // possible results)
+		    chunks_indices[index][1]=j;
-            int y1 = static_cast<int>(sqrt((rr) - x*x));
+		    chunks_indices[index][2]=k;
-
-            for (int y = -y1 + 1 ; y <= y1; y++)
-            {
-                // Step 2. At both y's, get the corresponding z values
-		int z1 = static_cast<int>(sqrt( rr - x*x - y*y));
-
-                for (int z = -z1 + 1; z <= z1; z++){
-		    chunks_indices[index][0] = x;
-		    chunks_indices[index][1] = y;
-		    chunks_indices[index][2] = z;
 		    index++;
 		}
-            }
-
-            if (!b)
-            {
-                xp++;
-                b = true;
-            }
-            else  b = false;
-	}
-	chunks_volume_real = index;
-
-	// Also init mesh data queue
-	for(int i = 0; i < 10; i++)
-	    chunkmesher::getMeshDataQueue().push(new chunkmesher::MeshData());
 
 	should_run = true;
 	update_thread = std::thread(update);
@@ -95,9 +80,13 @@ namespace chunkmanager
     void generate(){
 	while(should_run){
 	    ChunkPQEntry entry;
-	    while(chunks_to_generate_queue.try_pop(entry)) generateChunk(entry.first);
+	    if(chunks_to_generate_queue.try_pop(entry)){
+		generateChunk(entry.first);
+		entry.first->setState(Chunk::CHUNK_STATE_IN_GENERATION_QUEUE, false);
 	    }
 	}
+	//chunks_to_generate_queue.clear();
+    }
 
     // Method for chunk meshing thread(s)
     void mesh(){
@@ -105,113 +94,181 @@ namespace chunkmanager
 	    ChunkPQEntry entry;
 	    if(chunks_to_mesh_queue.try_pop(entry)){
 		Chunk::Chunk* chunk = entry.first;
-		if(chunk->getState(Chunk::CHUNK_STATE_GENERATED)){
 		chunkmesher::mesh(chunk);
-		    renderer::getChunksToRender().insert(chunk);
+		chunk->setState(Chunk::CHUNK_STATE_IN_MESHING_QUEUE, false);
-		}
 	    }
 	}
+	//chunks_to_mesh_queue.clear();
     }
 
-    oneapi::tbb::concurrent_queue<Chunk::Chunk*> chunks_todelete;
-    int nUnloaded{0};
     void update(){
 	while(should_run) {
-	    int chunkX=static_cast<int>(theCamera.getAtomicPosX() / CHUNK_SIZE);
+	    // Setup variables for the whole loop
-	    int chunkY=static_cast<int>(theCamera.getAtomicPosY() / CHUNK_SIZE);
+	    // Atomic is needed by parallel_for
-	    int chunkZ=static_cast<int>(theCamera.getAtomicPosZ() / CHUNK_SIZE);
+	    std::atomic_int nUnloaded{0}, nMarkUnload{0}, nExplored{0}, nMeshed{0}, nGenerated{0};
+	    std::atomic_int chunkX=static_cast<int>(theCamera.getAtomicPosX() / CHUNK_SIZE);
+	    std::atomic_int chunkY=static_cast<int>(theCamera.getAtomicPosY() / CHUNK_SIZE);
+	    std::atomic_int chunkZ=static_cast<int>(theCamera.getAtomicPosZ() / CHUNK_SIZE);
 
-	    debug::window::set_parameter("px", theCamera.getAtomicPosX());
+	    /* Process update messages before anything happens */
-	    debug::window::set_parameter("py", theCamera.getAtomicPosY());
+	    WorldUpdateMsg msg;
-	    debug::window::set_parameter("pz", theCamera.getAtomicPosZ());
+	    while(WorldUpdateQueue.try_pop(msg)){
-	    debug::window::set_parameter("cx", chunkX);
+		switch(msg.msg_type){
-	    debug::window::set_parameter("cy", chunkY);
+		    case WorldUpdateMsgType::BLOCKPICK_BREAK:
-	    debug::window::set_parameter("cz", chunkZ);
+		    case WorldUpdateMsgType::BLOCKPICK_PLACE:
-	    debug::window::set_parameter("lx", theCamera.getFront().x);
+			blockpick(msg);
-	    debug::window::set_parameter("ly", theCamera.getFront().y);
+			break;
-	    debug::window::set_parameter("lz", theCamera.getFront().z);
+		}
+	    }
 
-	    // Update other chunks
-	    for(int i = 0; i < chunks_volume_real; i++) {
-		const uint16_t x = chunks_indices[i][0] + chunkX;
-		const uint16_t y = chunks_indices[i][1] + chunkY;
-		const uint16_t z = chunks_indices[i][2] + chunkZ;
-		const uint32_t index = calculateIndex(x, y, z);
 
-		if(x > 1023 || y > 1023 || z > 1023) continue;
+	    // Eventually delete old chunks
+	    int i;
+	    ChunkTable::accessor a;
+	    while(chunks_todelete.try_pop(i)){
+		const int index = i;
+		if(chunks.find(a, index)){
+		    Chunk::Chunk* c = a->second;
+		    if(chunks.erase(a)){
+			nUnloaded++;
+			renderer::getDeleteIndexQueue().push(index);
+			delete c;
+		    } else std::cout << "failed to delete " << index << std::endl;
+		} else std::cout << "no such element found to delete\n";
+	    }
 
-		ChunkTable::accessor a, a1, a2, b1, b2, c1, c2;
+	    // Eventually create new chunks near the player
-		if(!chunks.find(a, index)) chunks.emplace(a, std::make_pair(index, new Chunk::Chunk(glm::vec3(x,y,z))));
+	    for(int i = 0; i < chunks_volume; i++) {
+		const int16_t x = chunks_indices[i][0] + chunkX;
+		const int16_t y = chunks_indices[i][1] + chunkY;
+		const int16_t z = chunks_indices[i][2] + chunkZ;
+
+		if(x < 0 || y < 0 || z < 0 || x > 1023 || y > 1023 || z > 1023) continue;
+		nExplored++;
+
+		const int32_t index = Chunk::calculateIndex(x, y, z);
+		ChunkTable::accessor a;
+		if(!chunks.find(a, index)) chunks.emplace(a, std::make_pair(index, new
+			    Chunk::Chunk(glm::vec3(x,y,z))));
+	    }
+
+	    // Now update all the chunks
+	    oneapi::tbb::parallel_for(chunks.range(), [&](ChunkTable::range_type &r){
+		for(ChunkTable::iterator a = r.begin(); a != r.end(); a++){
+		    Chunk::Chunk* c = a->second;
+
+		    int x = c->getPosition().x;
+		    int y = c->getPosition().y;
+		    int z = c->getPosition().z;
+		    int distx = x - chunkX;
+		    int disty = y - chunkY;
+		    int distz = z - chunkZ;
+
+		    int gen{0}, mesh{0}, unload{0};
 
-		if(! (a->second->getState(Chunk::CHUNK_STATE_GENERATED))) {
-		    chunks_to_generate_queue.push(std::make_pair(a->second, GENERATION_PRIORITY_NORMAL));
-		}else if(! (a->second->getState(Chunk::CHUNK_STATE_MESHED))){
 		    if(
-			    (x + 1 > 1023 || (chunks.find(a1, calculateIndex(x+1, y, z)) &&
+			    distx >= -RENDER_DISTANCE && distx < RENDER_DISTANCE &&
+			    disty >= -RENDER_DISTANCE && disty < RENDER_DISTANCE &&
+			    distz >= -RENDER_DISTANCE && distz < RENDER_DISTANCE
+		      ){
+
+			// If within distance
+			// Reset out-of-view flags
+			c->setState(Chunk::CHUNK_STATE_OUTOFVISION, false);
+			c->setState(Chunk::CHUNK_STATE_UNLOADED, false);
+
+			// If not yet generated
+			if(!c->getState(Chunk::CHUNK_STATE_GENERATED)){
+			    if(c->isFree()){
+				// Generate
+				c->setState(Chunk::CHUNK_STATE_IN_GENERATION_QUEUE, true);
+				chunks_to_generate_queue.push(std::make_pair(c, GENERATION_PRIORITY_NORMAL));
+			    }
+			}else{
+			    gen++;
+			    // If generated but not yet meshed
+			    // TODO: not getting meshed
+			    if(!c->getState(Chunk::CHUNK_STATE_MESHED)){
+				ChunkTable::accessor a1;
+				if(c->isFree() && 
+				    (distx+1 >= RENDER_DISTANCE || x + 1 > 1023 || (chunks.find(a1, Chunk::calculateIndex(x+1, y, z)) &&
 					a1->second->getState(Chunk::CHUNK_STATE_GENERATED))) && 
-			    (x - 1 < 0|| (chunks.find(a1, calculateIndex(x-1, y, z)) &&
+				    (distx-1 < -RENDER_DISTANCE || x - 1 < 0 || (chunks.find(a1, Chunk::calculateIndex(x-1, y, z)) &&
 					a1->second->getState(Chunk::CHUNK_STATE_GENERATED))) && 
-			    (y + 1 > 1023 || (chunks.find(a1, calculateIndex(x, y+1, z)) &&
+				    (disty+1 >= RENDER_DISTANCE || y + 1 > 1023 || (chunks.find(a1, Chunk::calculateIndex(x, y+1, z)) &&
 					a1->second->getState(Chunk::CHUNK_STATE_GENERATED))) && 
-			    (y - 1 < 0|| (chunks.find(a1, calculateIndex(x, y-1, z)) &&
+				    (disty-1 < -RENDER_DISTANCE || y - 1 < 0|| (chunks.find(a1, Chunk::calculateIndex(x, y-1, z)) &&
 					a1->second->getState(Chunk::CHUNK_STATE_GENERATED))) && 
-			    (z + 1 > 1023 || (chunks.find(a1, calculateIndex(x, y, z+1)) &&
+				    (distz+1 >= RENDER_DISTANCE || z + 1 > 1023 || (chunks.find(a1, Chunk::calculateIndex(x, y, z+1)) &&
 					a1->second->getState(Chunk::CHUNK_STATE_GENERATED))) && 
-			    (z - 1 < 0|| (chunks.find(a1, calculateIndex(x, y, z-1)) &&
+				    (distz-1 < -RENDER_DISTANCE || z - 1 < 0|| (chunks.find(a1, Chunk::calculateIndex(x, y, z-1)) &&
 					a1->second->getState(Chunk::CHUNK_STATE_GENERATED)))
 				  )
-		       chunks_to_mesh_queue.push(std::make_pair(a->second, MESHING_PRIORITY_NORMAL));
+				{
-		}
+				    // Mesh
-
+				    c->setState(Chunk::CHUNK_STATE_IN_MESHING_QUEUE, true);
-		a.release();
+				    chunks_to_mesh_queue.push(std::make_pair(c, MESHING_PRIORITY_NORMAL));
-	    }
-
-	    debug::window::set_parameter("update_chunks_total", (int) (chunks.size()));
-	    debug::window::set_parameter("update_chunks_bucket", (int) (chunks.max_size()));
-
-	    Chunk::Chunk* n;
-	    nUnloaded = 0;
-	    while(chunks_todelete.try_pop(n)){
-		int x = static_cast<uint16_t>(n->getPosition().x);
-		int y = static_cast<uint16_t>(n->getPosition().y);
-		int z = static_cast<uint16_t>(n->getPosition().z);
-		if(x > 1023 || y > 1023 || z > 1023) continue;
-		const uint32_t index = calculateIndex(x, y, z);
-
-		chunks.erase(index);
-		//delete n;
-		nUnloaded++;
 				}
+			    }else{
+				mesh++;
+				// If generated & meshed, render
 			    }
 			}
 
-    // uint32_t is fine, since i'm limiting the coordinate to only use up to ten bits (1023). There's actually two spare bits
+		    }else{
-    uint32_t calculateIndex(uint16_t i, uint16_t j, uint16_t k){
+			// If not within distance
-	 return i | (j << 10) | (k << 20); 
+			if(c->getState(Chunk::CHUNK_STATE_OUTOFVISION)){
+			    // If enough time has passed, set to be deleted
+			    if(c->isFree() && glfwGetTime() - c->unload_timer >= UNLOAD_TIMEOUT){
+				c->setState(Chunk::CHUNK_STATE_IN_DELETING_QUEUE, true);
+				chunks_todelete.push(c->getIndex());
+				unload++;
+			    }
+			}else{
+			    // Mark as out of view, and start waiting time
+			    c->setState(Chunk::CHUNK_STATE_OUTOFVISION, true);
+			    c->setState(Chunk::CHUNK_STATE_UNLOADED, false);
+			    c->unload_timer = glfwGetTime();
+			}
 		    }
 
-    oneapi::tbb::concurrent_queue<Chunk::Chunk*>& getDeleteVector(){ return chunks_todelete; }
+		    nGenerated += gen;
-    std::array<std::array<int, 3>, chunks_volume>& getChunksIndices(){ return chunks_indices; }
+		    nMeshed += mesh;
+		    nMarkUnload += unload;
+		}
+	    });
+
+
+	   std::cout << "time: " << glfwGetTime() << "\ntotal: " << chunks.size() << "\ngenerated: " << nGenerated << "\nmeshed: "
+		<< nMeshed << "\nunloaded from prev loop: " << nUnloaded << "\nnew marked for unload: " << nMarkUnload << std::endl;
+	    
+	}
+    }
+
+    std::array<std::array<int16_t, 3>, chunks_volume>& getChunksIndices(){ return chunks_indices; }
 
     void stop() {
 	should_run=false;
+
+	std::cout << "waiting for secondary threads to finish\n";
 	update_thread.join();
+	std::cout << "update thread terminated\n";
 	gen_thread.join();
+	std::cout << "generation thread terminated\n";
 	mesh_thread.join();
-    }
+	std::cout << "meshing thread terminated\n";
-    void destroy(){
+
-	/*for(const auto& n : chunks){
-	    delete n.second;
-	}*/
     }
 
-    void blockpick(bool place){
+    void destroy(){
+    }
+
+    void blockpick(WorldUpdateMsg& msg){
 	// cast a ray from the camera in the direction pointed by the camera itself
-	glm::vec3 pos = glm::vec3(theCamera.getAtomicPosX(), theCamera.getAtomicPosY(),
+	glm::vec3 pos = msg.cameraPos;
-		theCamera.getAtomicPosZ());
 	for(float t = 0.0; t <= 10.0; t += 0.5){
 	    // traverse the ray a block at the time
-	    pos = theCamera.getPos() + t * theCamera.getFront();
+	    pos = msg.cameraPos + t*msg.cameraFront;
 
 	    // get which chunk and block the ray is at
 	    int px = ((int)(pos.x))/CHUNK_SIZE;
@@ -225,7 +282,7 @@ namespace chunkmanager
 	    if(px < 0 || py < 0 || pz < 0 || px >= 1024 || py >= 1024 || pz >= 1024) continue;
 
 	    ChunkTable::accessor a;
-	    if(!chunks.find(a, calculateIndex(px, py, pz))) continue;
+	    if(!chunks.find(a, Chunk::calculateIndex(px, py, pz))) continue;
 	    Chunk::Chunk* c = a->second;
 	    if(!c->getState(Chunk::CHUNK_STATE_GENERATED) || c->getState(Chunk::CHUNK_STATE_EMPTY)) continue;
 
@@ -236,7 +293,7 @@ namespace chunkmanager
 	    if(b != Block::AIR){
 
 		// if placing a new block
-		if(place){
+		if(msg.msg_type == WorldUpdateMsgType::BLOCKPICK_PLACE){
 		    // Go half a block backwards on the ray, to check the block where the ray was
 		    // coming from
 		    // Doing this and not using normal adds the unexpected (and unwanted) ability to
@@ -254,7 +311,7 @@ namespace chunkmanager
 		    // exit early if the position is invalid or the chunk does not exist
 		    if(px1 < 0 || py1 < 0 || pz1 < 0 || px1 >= 1024 || py1 >= 1024 || pz1 >= 1024) return;
 		    ChunkTable::accessor a1;
-		    if(!chunks.find(a1, calculateIndex(px1, py1, pz1))) return;
+		    if(!chunks.find(a1, Chunk::calculateIndex(px1, py1, pz1))) return;
 		    Chunk::Chunk* c1 = a1->second;
 		    // place the new block (only stone for now)
 		    c1->setBlock((Block)block_to_place, bx1, by1, bz1);
@@ -263,8 +320,9 @@ namespace chunkmanager
 		    chunks_to_mesh_queue.push(std::make_pair(c1, MESHING_PRIORITY_PLAYER_EDIT));
 		    chunks_to_mesh_queue.push(std::make_pair(c, MESHING_PRIORITY_PLAYER_EDIT));
 
-		    debug::window::set_parameter("block_last_action", place);
+		    debug::window::set_parameter("block_last_action", (int)msg.msg_type);
-		    debug::window::set_parameter("block_last_action_block_type", (int)(Block::STONE));
+		    debug::window::set_parameter("block_last_action_block_type",
+			    (int)(block_to_place));
 		    debug::window::set_parameter("block_last_action_x", px1*CHUNK_SIZE + bx1);
 		    debug::window::set_parameter("block_last_action_y", px1*CHUNK_SIZE + by1);
 		    debug::window::set_parameter("block_last_action_z", px1*CHUNK_SIZE + bz1);
@@ -276,20 +334,20 @@ namespace chunkmanager
 
 		    // When necessary, also mesh nearby chunks
 		    ChunkTable::accessor a1, a2, b1, b2, c1, c2;
-		    if(bx == 0 && px - 1 >= 0 && chunks.find(a1, calculateIndex(px - 1, py, pz)))
+		    if(bx == 0 && px - 1 >= 0 && chunks.find(a1, Chunk::calculateIndex(px - 1, py, pz)))
-		      chunkmesher::mesh(a1->second);
+			chunks_to_mesh_queue.push(std::make_pair(a1->second, MESHING_PRIORITY_PLAYER_EDIT));
-		    if(by == 0 && py - 1 >= 0 && chunks.find(b1, calculateIndex(px, py - 1, pz)))
+		    if(by == 0 && py - 1 >= 0 && chunks.find(b1, Chunk::calculateIndex(px, py - 1, pz)))
-		      chunkmesher::mesh(b1->second);
+			chunks_to_mesh_queue.push(std::make_pair(a2->second, MESHING_PRIORITY_PLAYER_EDIT));
-		    if(bz == 0 && pz - 1 >= 0 && chunks.find(c1, calculateIndex(px, py, pz - 1)))
+		    if(bz == 0 && pz - 1 >= 0 && chunks.find(c1, Chunk::calculateIndex(px, py, pz - 1)))
-		      chunkmesher::mesh(c1->second);
+			chunks_to_mesh_queue.push(std::make_pair(b1->second, MESHING_PRIORITY_PLAYER_EDIT));
-		    if(bx == CHUNK_SIZE - 1 && px +1 < 1024 && chunks.find(a2, calculateIndex(px +1, py, pz)))
+		    if(bx == CHUNK_SIZE - 1 && px +1 < 1024 && chunks.find(a2, Chunk::calculateIndex(px +1, py, pz)))
-		      chunkmesher::mesh(a2->second);
+			chunks_to_mesh_queue.push(std::make_pair(b2->second, MESHING_PRIORITY_PLAYER_EDIT));
-		    if(by == CHUNK_SIZE - 1 && py +1 < 1024 && chunks.find(b2, calculateIndex(px, py +1, pz)))
+		    if(by == CHUNK_SIZE - 1 && py +1 < 1024 && chunks.find(b2, Chunk::calculateIndex(px, py +1, pz)))
-		      chunkmesher::mesh(b2->second);
+			chunks_to_mesh_queue.push(std::make_pair(c1->second, MESHING_PRIORITY_PLAYER_EDIT));
-		    if(bz == CHUNK_SIZE - 1 && pz +1 < 1024 && chunks.find(c2, calculateIndex(px, py, pz +1)))
+		    if(bz == CHUNK_SIZE - 1 && pz +1 < 1024 && chunks.find(c2, Chunk::calculateIndex(px, py, pz +1)))
-		      chunkmesher::mesh(c2->second);
+			chunks_to_mesh_queue.push(std::make_pair(c2->second, MESHING_PRIORITY_PLAYER_EDIT));
 
-		    debug::window::set_parameter("block_last_action", place);
+		    debug::window::set_parameter("block_last_action", (int)msg.msg_type);
 		    debug::window::set_parameter("block_last_action_block_type", (int) (Block::AIR));
 		    debug::window::set_parameter("block_last_action_x", px*CHUNK_SIZE + bx);
 		    debug::window::set_parameter("block_last_action_y", py*CHUNK_SIZE + by);
@@ -312,7 +370,7 @@ namespace chunkmanager
 
 	//std::cout << "Block at " << x << ", " << y << ", " << z << " is in chunk " << cx << "," << cy << "," << cz << "\n";
 	ChunkTable::accessor a;
-	if(!chunks.find(a, calculateIndex(cx, cy, cz))) return Block::NULLBLK;
+	if(!chunks.find(a, Chunk::calculateIndex(cx, cy, cz))) return Block::NULLBLK;
 	else {
 	    int bx = x % CHUNK_SIZE;
 	    int by = y % CHUNK_SIZE;

src/chunkmesher.cpp

@@ -11,15 +11,21 @@
 #include "spacefilling.hpp"
 #include "utils.hpp"
 
+#define CHUNKMESHER_BORDERS 0
+
 namespace chunkmesher{
 
-oneapi::tbb::concurrent_queue<MeshData*> MeshDataQueue;
+ChunkMeshDataQueue MeshDataQueue;
+ChunkMeshDataQueue& getMeshDataQueue(){ return MeshDataQueue; }
 
-oneapi::tbb::concurrent_queue<MeshData*>& getMeshDataQueue(){ return MeshDataQueue; }
+void init(){
+    for(int i = 0; i < 10; i++)
+	MeshDataQueue.push(new ChunkMeshData{});
+}
     
 void mesh(Chunk::Chunk* chunk)
 {
-    MeshData* mesh_data;
+    ChunkMeshData* mesh_data;
     if(!MeshDataQueue.try_pop(mesh_data)) return;
 
     /*
@@ -38,28 +44,13 @@ void mesh(Chunk::Chunk* chunk)
      */
 
     // Cleanup previous data
-    mesh_data->numVertices = 0;
+    mesh_data->clear();
-    mesh_data->chunk = chunk;
+    mesh_data->message_type = ChunkMeshDataType::MESH_UPDATE;
-    mesh_data->vertices.clear();
+    mesh_data->index = chunk->getIndex();
-    mesh_data->extents.clear();
+    mesh_data->position = chunk->getPosition();
-    mesh_data->texinfo.clear();
 
-    // Abort if chunk is empty
+    std::unique_ptr<Block[]> blocks;
-    if(chunk->getState(Chunk::CHUNK_STATE_EMPTY)){
-	chunk->setState(Chunk::CHUNK_STATE_MESHED, true);
-	renderer::getMeshDataQueue().push(mesh_data);
-	return;
-    }
-
-    // convert tree to array since it is easier to work with it
     int length{0};
-    std::unique_ptr<Block[]> blocks = chunk->getBlocksArray(&length);
-    if(length == 0) {
-	chunk->setState(Chunk::CHUNK_STATE_MESHED, true);
-	renderer::getMeshDataQueue().push(mesh_data);
-	return;
-    }
-    
     int k, l, u, v, w, h, n, j, i;
     int x[]{0, 0, 0};
     int q[]{0, 0, 0};
@@ -67,6 +58,14 @@ void mesh(Chunk::Chunk* chunk)
     int dv[]{0, 0, 0};
 
     std::array<Block, CHUNK_SIZE * CHUNK_SIZE> mask;
+
+    // Abort if chunk is empty
+    if(chunk->getState(Chunk::CHUNK_STATE_EMPTY)) goto end;
+
+    // convert tree to array since it is easier to work with it
+    blocks = chunk->getBlocksArray(&length);
+    if(length == 0) goto end;
+    
     for (bool backFace = true, b = false; b != backFace; backFace = backFace && b, b = !b)
     {
         // iterate over 3 dimensions
@@ -98,6 +97,7 @@ void mesh(Chunk::Chunk* chunk)
 			Block b1, b2;
 			if(x[dim] >= 0) b1 = blocks[HILBERT_XYZ_ENCODE[x[0]][x[1]][x[2]]];
 			else{
+			    // b1 = Block::NULLBLK;
 			    int cx = chunk->getPosition().x*CHUNK_SIZE;
 			    int cy = chunk->getPosition().y*CHUNK_SIZE;
 			    int cz = chunk->getPosition().z*CHUNK_SIZE;
@@ -112,6 +112,7 @@ void mesh(Chunk::Chunk* chunk)
 			if(x[dim] < CHUNK_SIZE - 1) b2 = blocks[HILBERT_XYZ_ENCODE[x[0] + q[0]][x[1]
 			    + q[1]][x[2] + q[2]]];
 			else{
+			    //b2 = Block::NULLBLK;
 			    int cx = chunk->getPosition().x*CHUNK_SIZE;
 			    int cy = chunk->getPosition().y*CHUNK_SIZE;
 			    int cz = chunk->getPosition().z*CHUNK_SIZE;
@@ -128,9 +129,15 @@ void mesh(Chunk::Chunk* chunk)
 			// The else case provides face culling for adjacent solid faces
 			// Checking for NULLBLK avoids creating empty faces if nearby chunk was not
 			// yet generated
+#if CHUNKMESHER_BORDERS == 1
 			mask[n++] = b1 == b2 ? Block::NULLBLK
                                     : backFace ? b1 == Block::NULLBLK || b1 == Block::AIR ? b2 : Block::NULLBLK
                                     : b2 == Block::NULLBLK || b2 == Block::AIR ? b1 : Block::NULLBLK;
+#else
+			mask[n++] = b1 == b2 ? Block::NULLBLK
+                                    : backFace ? b1 == Block::AIR ? b2 : Block::NULLBLK
+                                    : b2 == Block::AIR ? b1 : Block::NULLBLK;
+#endif
                     }
                 }
 
@@ -184,14 +191,15 @@ void mesh(Chunk::Chunk* chunk)
 				mesh_data->vertices.push_back(x[1]); //bottomLeft.y
 				mesh_data->vertices.push_back(x[2]); //bottomLeft.z
 
-				// extents, use normals for now
+				// extents
 				mesh_data->extents.push_back(du[0] + dv[0]);
 				mesh_data->extents.push_back(du[1] + dv[1]);
 				mesh_data->extents.push_back(du[2] + dv[2]);
 
+				// texture info (block type, backFace)
 				mesh_data->texinfo.push_back(backFace ? 0.0 : 1.0);
 				mesh_data->texinfo.push_back((int)(mask[n]) - 2);
-				mesh_data->numVertices++;
+				mesh_data->num_vertices++;
                             }
 
                             for (l = 0; l < h; ++l)
@@ -220,49 +228,8 @@ void mesh(Chunk::Chunk* chunk)
         }
     }
 
+end:
     chunk->setState(Chunk::CHUNK_STATE_MESHED, true);
     renderer::getMeshDataQueue().push(mesh_data);
 }
-
-void sendtogpu(MeshData* mesh_data)
-{
-    if (mesh_data->numVertices > 0)
-    {
-	if(mesh_data->chunk->VAO == 0) mesh_data->chunk->createBuffers();
-
-	// bind the Vertex Array Object first, then bind and set vertex buffer(s), and then configure vertex attributes(s).
-	glBindVertexArray(mesh_data->chunk->VAO);
-
-	// position attribute
-	glBindBuffer(GL_ARRAY_BUFFER, mesh_data->chunk->VBO);
-	glBufferData(GL_ARRAY_BUFFER, mesh_data->vertices.size() * sizeof(GLfloat), &(mesh_data->vertices[0]), GL_STATIC_DRAW);
-	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
-	glEnableVertexAttribArray(0);
-
-	// normal attribute
-	glBindBuffer(GL_ARRAY_BUFFER, mesh_data->chunk->extentsBuffer);
-	glBufferData(GL_ARRAY_BUFFER, mesh_data->extents.size() * sizeof(GLfloat), &(mesh_data->extents[0]), GL_STATIC_DRAW);
-	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)(0));
-	glEnableVertexAttribArray(1);
-
-	// texcoords attribute
-	glBindBuffer(GL_ARRAY_BUFFER, mesh_data->chunk->texinfoBuffer);
-	glBufferData(GL_ARRAY_BUFFER, mesh_data->texinfo.size() * sizeof(GLfloat), &(mesh_data->texinfo[0]), GL_STATIC_DRAW);
-	glEnableVertexAttribArray(2);
-	glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void *)0);
-
-	glBindVertexArray(0);
-
-	// save the number of indices of the mesh, it is needed later for drawing
-	mesh_data->chunk->numVertices = (GLuint)(mesh_data->numVertices);
-
-	// once data has been sent to the GPU, it can be cleared from system RAM
-	mesh_data->vertices.clear();
-	mesh_data->extents.clear();
-	mesh_data->texinfo.clear();
-    }
-    
-    // mark the chunk mesh has loaded on GPU
-    mesh_data->chunk->setState(Chunk::CHUNK_STATE_MESH_LOADED, true);
-}
 };

src/controls.cpp

@@ -0,0 +1,63 @@
+#include "controls.hpp"
+
+#include "camera.hpp"
+#include "chunkmanager.hpp"
+#include "globals.hpp"
+#include "renderer.hpp"
+
+namespace controls{
+    WorldUpdateMsgQueue MsgQueue;
+    float lastBlockPick=0.0;
+    bool blockpick = false;
+    bool cursor = false;
+
+    void init(){
+    }
+    
+    void update(GLFWwindow* window){
+	// Reset blockping timeout have passed
+	float current_time = glfwGetTime();
+
+	/* BlockPicking */
+	// Reset blockpicking if enough time has passed
+	if(current_time - lastBlockPick > BLOCKPICK_TIMEOUT) blockpick = false;
+	// Reset blockpicking if both mouse buttons are released
+	if(glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_1) == GLFW_RELEASE && glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_2) == GLFW_RELEASE) blockpick = false;
+	// Process block picking if a mouse button is pressed
+	if((glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_1) == GLFW_PRESS ||
+		glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_2 == GLFW_PRESS)) && !blockpick){
+
+	    // Start timeout for next block pick action
+	    blockpick =  true;
+	    lastBlockPick = current_time;
+
+	    // Construct the message to send to chunkmanager
+
+	    // WorldUpdateMsg is allocated on the stack
+	    // unlike ChunkMeshData, the fields of WorldUpdateMsg are few and light, so there's no
+	    // problem in passing them by value each time.
+	    // It also has the advantage of having less memory to manage, since I'm not allocating
+	    // anything on the heap
+
+	    WorldUpdateMsg msg{};
+	    msg.cameraPos = theCamera.getPos();
+	    msg.cameraFront = theCamera.getFront();
+	    msg.time = current_time;
+	    msg.msg_type = glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_1) == GLFW_PRESS ?
+	    WorldUpdateMsgType::BLOCKPICK_PLACE : WorldUpdateMsgType::BLOCKPICK_BREAK;
+
+	    // Send to chunk manager
+	    chunkmanager::getWorldUpdateQueue().push(msg);
+	}
+
+	/* SCREENSHOTS */
+	if(glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS) renderer::saveScreenshot();
+	if(glfwGetKey(window, GLFW_KEY_F3) == GLFW_PRESS) renderer::saveScreenshot(true);
+	if(glfwGetKey(window, GLFW_KEY_M) == GLFW_PRESS) {
+	    cursor = !cursor;
+	    glfwSetInputMode(window, GLFW_CURSOR, cursor ? GLFW_CURSOR_NORMAL : GLFW_CURSOR_DISABLED);
+	}
+    }
+
+    WorldUpdateMsgQueue& getWorldUpdateQueue(){ return MsgQueue; }
+};

src/debugwindow.cpp

@@ -1,3 +1,6 @@
+#include <glad/glad.h>
+#include <GLFW/glfw3.h>
+
 #include "debugwindow.hpp"
 
 #include <imgui/imgui.h>
@@ -62,13 +65,14 @@ namespace debug{
 	void show_debug_window(){
 	    ImGui::Begin("Debug Window");
 
-	    ImGui::PushItemWidth(ImGui::GetFontSize() * -12);
+	    //ImGui::PushItemWidth(ImGui::GetFontSize() * -12);
 
 	    try{
 		if (ImGui::CollapsingHeader("Frametimes")){
 		    ImGui::Text("FPS: %d", std::any_cast<int>(parameters.at("fps")));
 		    ImGui::Text("Frametime (ms): %f",
 			    std::any_cast<float>(parameters.at("frametime"))*1000);
+		    ImGui::Text("GPU: %s %s", glGetString(GL_VENDOR), glGetString(GL_RENDERER));
 		    //ImGui::PlotLines("Frame Times", arr, IM_ARRAYSIZE(arr);
 		}
 
@@ -95,18 +99,15 @@ namespace debug{
 		}
 
 		if(ImGui::CollapsingHeader("Mesh")){
-		    ImGui::Text("Total chunks updated: %d",
+		    ImGui::Text("Total chunk meshed: %d",
 			    std::any_cast<int>(parameters.at("render_chunks_total")));
+		    ImGui::Text("Of which renderable (not empty): %d",
+			    std::any_cast<int>(parameters.at("render_chunks_renderable")));
 		    ImGui::Text("Chunks rendered: %d",
 			std::any_cast<int>(parameters.at("render_chunks_rendered")));
 		    ImGui::Text("Frustum culled: %d",
 			std::any_cast<int>(parameters.at("render_chunks_culled")));
-		    ImGui::Text("Chunks out of view: %d",
+		    ImGui::Text("Total vertices in the scene: %d",
-			std::any_cast<int>(parameters.at("render_chunks_oof")));
-		    if(parameters.find("render_chunks_deleted") != parameters.end())
-			ImGui::Text("Chunks deleted: %d",
-			    std::any_cast<int>(parameters.at("render_chunks_deleted")));
-		    ImGui::Text("Vertices in the scene: %d",
 			std::any_cast<int>(parameters.at("render_chunks_vertices")));
 		    ImGui::Checkbox("Wireframe",
 			    std::any_cast<bool*>(parameters.at("wireframe_return")));
@@ -115,13 +116,21 @@ namespace debug{
 		if(ImGui::CollapsingHeader("Chunks")){
 		    ImGui::Text("Total chunks present: %d",
 			std::any_cast<int>(parameters.at("update_chunks_total")));
-		    /*ImGui::Text("Chunks freed from memory: %d",
+		    ImGui::Text("Buckets in hash map: %d",
-			std::any_cast<int>(parameters.at("update_chunks_delete")));*/
+			std::any_cast<int>(parameters.at("update_chunks_buckets")));
-		    ImGui::Text("Bucket size: %d",
+		    ImGui::Text("Chunks generated: %d",
-			std::any_cast<int>(parameters.at("update_chunks_bucket")));
+			std::any_cast<int>(parameters.at("update_chunks_generated")));
+		    ImGui::Text("Chunks meshed: %d",
+			std::any_cast<int>(parameters.at("update_chunks_meshed")));
+		    ImGui::Text("Chunks actually freed from memory: %d",
+			std::any_cast<int>(parameters.at("update_chunks_freed")));
+		    ImGui::Text("Chunks explored: %d",
+			std::any_cast<int>(parameters.at("update_chunks_explored")));
 		}
 	    }catch(const std::bad_any_cast& e){
 		std::cout << e.what();
+	    }catch(const std::out_of_range& e){
+		std::cout << e.what();
 	    }
 
 	    ImGui::End();

src/main.cpp

@@ -1,15 +1,16 @@
 #include <glad/glad.h>
 #include <GLFW/glfw3.h>
 
+#include "main.hpp"
+
 #include <iostream>
 #include <thread>
 
 #define GLOBALS_DEFINER
 #include "globals.hpp"
 #undef GLOBALS_DEFINER
-
 #include "chunkmanager.hpp"
-#include "main.hpp"
+#include "controls.hpp"
 #include "debugwindow.hpp"
 #include "renderer.hpp"
 #include "spacefilling.hpp"
@@ -20,10 +21,6 @@ float lastFrame = 0.0f; // Time of last frame
 float lastFPSFrame = 0.0f;
 int frames = 0;
 
-float lastBlockPick=0.0;
-bool blockpick = false;
-bool cursor = false;
-
 int main()
 {
 
@@ -61,8 +58,6 @@ int main()
     //glEnable(GL_FRAMEBUFFER_SRGB); //gamma correction done in fragment shader
     //glEnable(GL_CULL_FACE); //GL_BACK GL_CCW by default
 
-    std::cout << "Using GPU: " << glGetString(GL_VENDOR) << " " << glGetString(GL_RENDERER) << "\n";
-
     wireframe = false;
     for(int i = 0; i < 360; i++){
 	sines[i] = sin(3.14 / 180 * i);
@@ -70,7 +65,9 @@ int main()
     }
 
     SpaceFilling::initLUT();
+    controls::init();
     chunkmanager::init();
+    chunkmesher::init();
     debug::window::init(window);
     renderer::init(window);
 
@@ -94,15 +91,16 @@ int main()
         glClearColor(0.431f, 0.694f, 1.0f, 1.0f);
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 
+	// Only handle window closing here
+	if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
+	    glfwSetWindowShouldClose(window, true);
+
         // Input processing
-        processInput(window);
+	controls::update(window);
 
         // Camera
         theCamera.update(window, deltaTime);
 
-	// Reset blockping timeout if 200ms have passed
-	if(glfwGetTime() - lastBlockPick > 0.1) blockpick = false;
-
 	// Render pass
 	renderer::render();
 
@@ -115,9 +113,9 @@ int main()
     chunkmanager::stop();
 
     // Cleanup allocated memory
-    chunkmanager::destroy();
-    renderer::destroy();
     debug::window::destroy();
+    renderer::destroy();
+    chunkmanager::destroy();
 
     glfwTerminate();
     return 0;
@@ -134,33 +132,3 @@ void mouse_callback(GLFWwindow *window, double xpos, double ypos)
 {
     theCamera.mouseCallback(window, xpos, ypos);
 }
-
-void processInput(GLFWwindow *window)
-{
-    if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
-        glfwSetWindowShouldClose(window, true);
-
-    if(glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_2) == GLFW_PRESS && !blockpick){
-	chunkmanager::blockpick(false);
-	blockpick=true;
-	lastBlockPick=glfwGetTime();
-    }
-
-    if(glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_1) == GLFW_PRESS && !blockpick){
-	chunkmanager::blockpick(true);
-	blockpick=true;
-	lastBlockPick=glfwGetTime();
-    }
-
-    // Reset blockpicking if enough time has passed
-    if(glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_1) == GLFW_RELEASE && glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_2) == GLFW_RELEASE) blockpick = false;
-
-    if(glfwGetKey(window, GLFW_KEY_F2) == GLFW_PRESS) renderer::saveScreenshot();
-    if(glfwGetKey(window, GLFW_KEY_F3) == GLFW_PRESS) renderer::saveScreenshot(true);
-    if(glfwGetKey(window, GLFW_KEY_M) == GLFW_PRESS) {
-	cursor = !cursor;
-	glfwSetInputMode(window, GLFW_CURSOR, cursor ? GLFW_CURSOR_NORMAL : GLFW_CURSOR_DISABLED);
-    }
-    
-
-}

src/renderer.cpp

@@ -1,7 +1,9 @@
 #include "renderer.hpp"
 
-#include <oneapi/tbb/concurrent_vector.h>
+#include <glm/ext.hpp>
-#include <oneapi/tbb/concurrent_queue.h>
+#include <glm/gtx/string_cast.hpp>
+
+#include <oneapi/tbb/concurrent_hash_map.h>
 
 #include "chunkmanager.hpp"
 #include "chunkmesher.hpp"
@@ -12,23 +14,25 @@
 #include "stb_image_write.h"
 
 namespace renderer{
-    RenderSet chunks_torender;
+    typedef oneapi::tbb::concurrent_hash_map<int32_t, RenderInfo*> RenderTable;
-    oneapi::tbb::concurrent_vector<Chunk::Chunk*> render_todelete;
+
-    oneapi::tbb::concurrent_queue<chunkmesher::MeshData*> MeshDataQueue;
+    RenderTable ChunksToRender;
+    ChunkMeshDataQueue MeshDataQueue;
+    IndexQueue MeshDataToDelete;
 
     Shader* theShader, *quadShader;
     GLuint chunkTexture;
 
-    Shader* getRenderShader() { return theShader; }
-    RenderSet& getChunksToRender(){ return chunks_torender; }
-    oneapi::tbb::concurrent_queue<chunkmesher::MeshData*>& getMeshDataQueue(){ return MeshDataQueue; }
-
     GLuint renderTexFrameBuffer, renderTex, renderTexDepthBuffer, quadVAO, quadVBO;
     int screenWidth, screenHeight;
 
     int crosshair_type{0};
     bool wireframe{false};
 
+    Shader* getRenderShader() { return theShader; }
+    ChunkMeshDataQueue& getMeshDataQueue(){ return MeshDataQueue; }
+    IndexQueue& getDeleteIndexQueue(){ return MeshDataToDelete; }
+
     void init(GLFWwindow* window){
 	// Setup rendering
 	// We will render the image to a texture, then display the texture on a quad that fills the
@@ -138,26 +142,56 @@ namespace renderer{
 	theShader->use();
 	theShader->setVec3("viewPos", cameraPos);
 
-	chunkmesher::MeshData* m;
+	ChunkMeshData* m;
 	while(MeshDataQueue.try_pop(m)){
-	    chunkmesher::sendtogpu(m);
+	    RenderTable::accessor a;
+	    RenderInfo* render_info;
+
+	    if(ChunksToRender.find(a, m->index)){
+		render_info = a->second;
+		render_info->position = m->position;
+		render_info->num_vertices = m->num_vertices;
+		std::cout << "index collision on " << render_info->index << std::endl;
+	    }else{
+		render_info = new RenderInfo();
+		render_info->index = m->index;
+		render_info->position = m->position;
+		render_info->num_vertices = m->num_vertices;
+
+		ChunksToRender.emplace(a, std::make_pair(render_info->index, render_info));
+	    }
+
+	    send_chunk_to_gpu(m, render_info);
 	    chunkmesher::getMeshDataQueue().push(m);
 	}
 
-	for(auto& c : chunks_torender){
+	// TODO: implement removal of chunks from rendering
-	    float dist = glm::distance(c->getPosition(), cameraChunkPos);
+	int32_t queue_index;
-	    if(dist <= static_cast<float>(RENDER_DISTANCE)){
+	while(MeshDataToDelete.try_pop(queue_index)){
-		if(!c->getState(Chunk::CHUNK_STATE_MESH_LOADED)) continue;
+	    RenderTable::accessor a;
+
+	    if(ChunksToRender.find(a, queue_index)){
+		RenderInfo* render_info = a->second;
+		render_info->deallocateBuffers();
+		delete render_info;
+		ChunksToRender.erase(a);
+	    }
+	}
+
+	// Render the chunks
+	// parallel_for cannot be used since all the rendering needs to happen in a single thread
+	for(RenderTable::iterator i = ChunksToRender.begin(); i != ChunksToRender.end(); i++){
+	    RenderInfo* render_info = i->second;
+	    
+	    if(render_info->num_vertices > 0)
+	    {
+		total++;
 
 		// Increase total vertex count
-		vertices += c->numVertices;
+		vertices += render_info->num_vertices;
-
-		// reset out-of-vision and unload flags
-		c->setState(Chunk::CHUNK_STATE_OUTOFVISION, false);
-		c->setState(Chunk::CHUNK_STATE_UNLOADED, false);
 
 		// Perform frustum culling and eventually render
-		glm::vec3 chunk = c->getPosition();
+		glm::vec3 chunk = render_info->position;
 		glm::vec4 chunkW = glm::vec4(chunk.x*static_cast<float>(CHUNK_SIZE), chunk.y*static_cast<float>(CHUNK_SIZE), chunk.z*static_cast<float>(CHUNK_SIZE),1.0);
 		glm::mat4 model = glm::translate(glm::mat4(1.0), ((float)CHUNK_SIZE) * chunk);
 
@@ -178,58 +212,26 @@ namespace renderer{
 		}
 
 		if (!out)
-		{
-		    if(c->numVertices > 0)
 		{
 		    theShader->setMat4("model", model);
 		    theShader->setMat4("view", theCamera.getView());
 		    theShader->setMat4("projection", theCamera.getProjection());
 
-			glBindVertexArray(c->VAO);
+		    glBindVertexArray(render_info->VAO);
-			glDrawArrays(GL_POINTS, 0, c->numVertices);
+		    glDrawArrays(GL_POINTS, 0, render_info->num_vertices);
 		    glBindVertexArray(0);
 
 		    toGpu++;
 		}
 	    }
-	    }else{
-		// When the chunk is outside render distance
-
-		if(c->getState(Chunk::CHUNK_STATE_OUTOFVISION)){
-		    oof++;
-		    if(glfwGetTime() - c->unload_timer > UNLOAD_TIMEOUT){
-			// If chunk was already out and enough time has passed
-			// Mark the chunk to be unloaded
-			// And mark is to be removed from the render set
-			render_todelete.push_back(c);
-		    }
-		} else{
-		    // Mark has out of vision and annotate when it started
-		    c->setState(Chunk::CHUNK_STATE_OUTOFVISION, true);
-		    c->setState(Chunk::CHUNK_STATE_UNLOADED, false);
-		    c->unload_timer = glfwGetTime();
 	}
 
-	    }
+	debug::window::set_parameter("render_chunks_total", (int)(ChunksToRender.size()));
-	}
-
-	total = chunks_torender.size();
-	debug::window::set_parameter("render_chunks_total", total);
 	debug::window::set_parameter("render_chunks_rendered", toGpu);
+	debug::window::set_parameter("render_chunks_renderable", total);
 	debug::window::set_parameter("render_chunks_culled", total-toGpu);
-	debug::window::set_parameter("render_chunks_oof", oof);
-	debug::window::set_parameter("render_chunks_deleted", (int) (render_todelete.size()));
 	debug::window::set_parameter("render_chunks_vertices", vertices);
 
-	for(auto& c : render_todelete){
-	    // we can get away with unsafe erase as access to the container is only done by this
-	    // thread
-	    c->deleteBuffers();
-	    chunks_torender.unsafe_erase(c);
-	    chunkmanager::getDeleteVector().push(c);
-	}
-	render_todelete.clear();
-
 	/* DISPLAY TEXTURE ON A QUAD THAT FILLS THE SCREEN */
 	// Now to render the quad, with the texture on top
 	// Switch to the default frame buffer
@@ -251,6 +253,39 @@ namespace renderer{
 	debug::window::render();
     }
 
+    void send_chunk_to_gpu(ChunkMeshData* mesh_data, RenderInfo* render_info)
+    {
+	if (render_info->num_vertices > 0)
+	{
+	    if(!render_info->buffers_allocated) render_info->allocateBuffers();
+
+	    // bind the Vertex Array Object first, then bind and set vertex buffer(s), and then configure vertex attributes(s).
+	    glBindVertexArray(render_info->VAO);
+
+	    // TODO: change GL_STATIC_DRAW to the one that means "few redraws and further in between"
+
+	    // position attribute
+	    glBindBuffer(GL_ARRAY_BUFFER, render_info->VBO);
+	    glBufferData(GL_ARRAY_BUFFER, mesh_data->vertices.size() * sizeof(GLfloat), &(mesh_data->vertices[0]), GL_STATIC_DRAW);
+	    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)0);
+	    glEnableVertexAttribArray(0);
+
+	    // normal attribute
+	    glBindBuffer(GL_ARRAY_BUFFER, render_info->extentsBuffer);
+	    glBufferData(GL_ARRAY_BUFFER, mesh_data->extents.size() * sizeof(GLfloat), &(mesh_data->extents[0]), GL_STATIC_DRAW);
+	    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void *)(0));
+	    glEnableVertexAttribArray(1);
+
+	    // texcoords attribute
+	    glBindBuffer(GL_ARRAY_BUFFER, render_info->texinfoBuffer);
+	    glBufferData(GL_ARRAY_BUFFER, mesh_data->texinfo.size() * sizeof(GLfloat), &(mesh_data->texinfo[0]), GL_STATIC_DRAW);
+	    glEnableVertexAttribArray(2);
+	    glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void *)0);
+
+	    glBindVertexArray(0);
+	}
+    }
+
     void framebuffer_size_callback(GLFWwindow *window, int width, int height){
 	resize_framebuffer(width, height);
     }

test2.cpp

@@ -0,0 +1,34 @@
+#include <iostream>
+#include <string>
+#include <thread>
+
+#include "oneapi/tbb/concurrent_hash_map.h"
+#include "oneapi/tbb/tbb_allocator.h"
+
+typedef oneapi::tbb::concurrent_hash_map<int, int, oneapi::tbb::tbb_allocator<int>> CTable;
+
+CTable table;
+void f(){
+    /*while(table.size() > 0){
+	std::cout << "---------------\n";
+	    oneapi::tbb::parallel_for(table.range(), [=](Table::range_type &r){
+		for(Table::const_iterator a = r.begin(); a != r.end(); a++){
+		    std::cout << a->first << ": " << a->second << std::endl;
+		}
+	    });
+    }*/
+}
+
+int main(){
+    std::thread t = std::thread(f);
+
+    //Table::accessor a;
+    /*table.emplace(a, std::make_pair(0, "zero"));
+    table.emplace(a, std::make_pair(1, "one"));
+    table.emplace(a, std::make_pair(2, "two"));
+    table.emplace(a, std::make_pair(3, "three"));
+    table.emplace(a, std::make_pair(4, "four"));
+    table.emplace(a, std::make_pair(5, "five"));*/
+
+    t.join();
+}