include/chunk.hpp

@@ -56,7 +56,7 @@ namespace Chunk
 	std::unique_ptr<Block[]> getBlocksArray(int* len) { return (this->blocks.toArray(len)); }
 
     public:
-        GLuint VAO{0}, VBO{0}, EBO{0}, colorBuffer{0}, numVertices{0};
+        GLuint VAO{0}, VBO{0}, EBO{0}, colorBuffer{0}, numTriangles{0};
 	std::atomic<float> unload_timer{0};
 
     private:

include/chunkmesher.hpp

@@ -15,6 +15,8 @@
 namespace chunkmesher{
     struct MeshData{
 	Chunk::Chunk* chunk; 
+	GLuint numVertices{0};
+
 	std::vector<GLfloat> vertices;
 	std::vector<GLfloat> colors;
 	std::vector<GLuint> indices;

src/chunkmanager.cpp

@@ -136,4 +136,70 @@ namespace chunkmanager
 	}*/
     }
 
+    void blockpick(bool place){
+	// cast a ray from the camera in the direction pointed by the camera itself
+	glm::vec3 pos = glm::vec3(theCamera.getAtomicPosX(), theCamera.getAtomicPosY(),
+		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();
+
+	    // get which chunk and block the ray is at
+	    int px = ((int)(pos.x))/CHUNK_SIZE;
+	    int py = ((int)(pos.y))/CHUNK_SIZE;
+	    int pz = ((int)(pos.z))/CHUNK_SIZE;
+	    int bx = pos.x - px*CHUNK_SIZE;
+	    int by = pos.y - py*CHUNK_SIZE;
+	    int bz = pos.z - pz*CHUNK_SIZE;
+
+	    // exit early if the position is invalid or the chunk does not exist
+	    if(px < 0 || py < 0 || pz < 0 || px >= 1024 || py >= 1024 || pz >= 1024) return;
+
+	    ChunkTable::accessor a;
+	    if(!chunks.find(a, calculateIndex(px, py, pz))) return;
+	    Chunk::Chunk* c = a->second;
+	    if(!c->getState(Chunk::CHUNK_STATE_GENERATED) || c->getState(Chunk::CHUNK_STATE_EMPTY)) continue;
+
+	    Block b = c->getBlock(bx, by, bz);
+
+	    a.release();
+	    // if the block is non empty
+	    if(b != Block::AIR){
+
+		// if placing a new block
+		if(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
+		    // place blocks diagonally, without faces colliding with the block that has
+		    // been clicked
+		    pos -= theCamera.getFront()*0.5f;
+
+		    int px1 = ((int)(pos.x))/CHUNK_SIZE;
+		    int py1 = ((int)(pos.y))/CHUNK_SIZE;
+		    int pz1 = ((int)(pos.z))/CHUNK_SIZE;
+		    int bx1 = pos.x - px1*CHUNK_SIZE;
+		    int by1 = pos.y - py1*CHUNK_SIZE;
+		    int bz1 = pos.z - pz1*CHUNK_SIZE;
+
+		    // 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;
+		    Chunk::Chunk* c1 = a1->second;
+		    // place the new block (only stone for now)
+		    c1->setBlock( Block::STONE, bx1, by1, bz1);
+
+		    // mark the mesh of the chunk the be updated
+		    c1->setState(Chunk::CHUNK_STATE_MESHED, false);
+		}else{
+		    // replace the current block with air to remove it
+		    c->setBlock( Block::AIR, bx, by, bz);
+
+		    c->setState(Chunk::CHUNK_STATE_MESHED, false);
+		}
+		break;
+	    }
+	}
+    }
 };

src/chunkmesher.cpp

@@ -36,7 +36,7 @@ void mesh(Chunk::Chunk* chunk)
      */
 
     // Cleanup previous data
-    chunk->numVertices = 0;
+    mesh_data->numVertices = 0;
     mesh_data->chunk = chunk;
     mesh_data->vertices.clear();
     mesh_data->indices.clear();
@@ -202,7 +202,7 @@ void mesh(Chunk::Chunk* chunk)
 
 void sendtogpu(MeshData* mesh_data)
 {
-    if (mesh_data->chunk->numVertices > 0)
+    if (mesh_data->numVertices > 0)
     {
 	if(mesh_data->chunk->VAO == 0) mesh_data->chunk->createBuffers();
 
@@ -234,7 +234,7 @@ void sendtogpu(MeshData* mesh_data)
 	glBindVertexArray(0);
 
 	// save the number of indices of the mesh, it is needed later for drawing
-	mesh_data->chunk->numVertices = (GLuint)(mesh_data->indices.size());
+	mesh_data->chunk->numTriangles = (GLuint)(mesh_data->indices.size());
 
 	// once data has been sent to the GPU, it can be cleared from system RAM
 	mesh_data->vertices.clear();
@@ -330,22 +330,22 @@ void quad(MeshData* mesh_data, glm::vec3 bottomLeft, glm::vec3 topLeft, glm::vec
 
     if (backFace)
     {   
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 2);
+        mesh_data->indices.push_back(mesh_data->numVertices + 2);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices);
+        mesh_data->indices.push_back(mesh_data->numVertices);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 1);
+        mesh_data->indices.push_back(mesh_data->numVertices + 1);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 1);
+        mesh_data->indices.push_back(mesh_data->numVertices + 1);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 3);
+        mesh_data->indices.push_back(mesh_data->numVertices + 3);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 2);
+        mesh_data->indices.push_back(mesh_data->numVertices + 2);
     }
     else
     {
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 2);
+        mesh_data->indices.push_back(mesh_data->numVertices + 2);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 3);
+        mesh_data->indices.push_back(mesh_data->numVertices + 3);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 1);
+        mesh_data->indices.push_back(mesh_data->numVertices + 1);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 1);
+        mesh_data->indices.push_back(mesh_data->numVertices + 1);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices);
+        mesh_data->indices.push_back(mesh_data->numVertices);
-        mesh_data->indices.push_back(mesh_data->chunk->numVertices + 2);
+        mesh_data->indices.push_back(mesh_data->numVertices + 2);
     }
-    mesh_data->chunk->numVertices += 4;
+    mesh_data->numVertices += 4;
 }
 };

src/main.cpp

@@ -129,13 +129,13 @@ void processInput(GLFWwindow *window)
         glfwSetWindowShouldClose(window, true);
 
     if(glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_2) == GLFW_PRESS && !blockpick){
-	//chunkmanager::blockpick(false);
+	chunkmanager::blockpick(false);
 	blockpick=true;
 	lastBlockPick=glfwGetTime();
     }
 
     if(glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_1) == GLFW_PRESS && !blockpick){
-	//chunkmanager::blockpick(true);
+	chunkmanager::blockpick(true);
 	blockpick=true;
 	lastBlockPick=glfwGetTime();
     }

src/renderer.cpp

@@ -62,8 +62,6 @@ namespace renderer{
 	}
 
 	for(auto& c : chunks_torender){
-	    if(! (c->getState(Chunk::CHUNK_STATE_MESHED))) continue;
-	    
 	    float dist = glm::distance(c->getPosition(), cameraChunkPos);
 	    if(dist <= static_cast<float>(RENDER_DISTANCE)){
 		if(!c->getState(Chunk::CHUNK_STATE_MESH_LOADED)) continue;
@@ -95,7 +93,7 @@ namespace renderer{
 
 		if (!out)
 		{
-		    if(c->numVertices > 0)
+		    if(c->numTriangles > 0)
 		    {
 			// glPolygonMode(GL_FRONT_AND_BACK, GL_LINE); // wireframe mode
 			theShader->setMat4("model", model);
@@ -103,7 +101,7 @@ namespace renderer{
 			theShader->setMat4("projection", theCamera.getProjection());
 
 			glBindVertexArray(c->VAO);
-			glDrawElements(GL_TRIANGLES, c->numVertices , GL_UNSIGNED_INT, 0);
+			glDrawElements(GL_TRIANGLES, c->numTriangles , GL_UNSIGNED_INT, 0);
 			glBindVertexArray(0);
 		    }
 		}