From 69c44e3609e4ea5e23bcf5a822be8c299583c523 Mon Sep 17 00:00:00 2001
From: emamaker <emamaker0@gmail.com>
Date: Thu, 1 Dec 2022 23:37:57 +0100
Subject: [PATCH] enable faceculling

Doesn't give a massive improve in performance right now, but a nice one to have and was already made from the jme3 porting
---
 src/chunkmesh.cpp | 38 ++++++++++++++++++++------------------
 src/main.cpp      | 13 +++++++------
 2 files changed, 27 insertions(+), 24 deletions(-)

diff --git a/src/chunkmesh.cpp b/src/chunkmesh.cpp
index 8fd9618..b3d737e 100755
--- a/src/chunkmesh.cpp
+++ b/src/chunkmesh.cpp
@@ -99,10 +99,10 @@ void ChunkMesh::mesh()
                 {
                     for (x[u] = 0; x[u] < CHUNK_SIZE; x[u]++)
                     {
-                        Block b1 = (x[dim] >= 0) ? blocks[HILBERT_XYZ_ENCODE[x[0]][x[1]][x[2]]]: Block::NULLBLK;
+                        Block b1 = (x[dim] >= 0) ? blocks[HILBERT_XYZ_ENCODE[x[0]][x[1]][x[2]]] : Block::NULLBLK;
                         Block b2 = (x[dim] < CHUNK_SIZE - 1)
                                        ? blocks[HILBERT_XYZ_ENCODE[x[0] + q[0]][x[1] + q[1]][x[2] + q[2]]]
-                                       : Block::NULLBLK; 
+                                       : Block::NULLBLK;
 
                         // This is the original line taken from rob's code, readapted (replace voxelFace
                         // with b1 and b2).
@@ -263,23 +263,25 @@ void ChunkMesh::quad(glm::vec3 bottomLeft, glm::vec3 topLeft, glm::vec3 topRight
     vertices.push_back(topRight.y);
     vertices.push_back(topRight.z);
 
-    indices.push_back(vIndex + 2);
-    indices.push_back(vIndex + 3);
-    indices.push_back(vIndex + 1);
-    indices.push_back(vIndex + 1);
-    indices.push_back(vIndex);
-    indices.push_back(vIndex + 2);
+    if (backFace)
+    {   
+        indices.push_back(vIndex + 2);
+        indices.push_back(vIndex);
+        indices.push_back(vIndex + 1);
+        indices.push_back(vIndex + 1);
+        indices.push_back(vIndex + 3);
+        indices.push_back(vIndex + 2);
+    }
+    else
+    {
+        indices.push_back(vIndex + 2);
+        indices.push_back(vIndex + 3);
+        indices.push_back(vIndex + 1);
+        indices.push_back(vIndex + 1);
+        indices.push_back(vIndex);
+        indices.push_back(vIndex + 2);
+    }
     vIndex += 4;
-    // }
-    // else
-    // {
-    //     indices.push_back(i + 2);
-    //     indices.push_back(i + 3);
-    //     indices.push_back(i + 1);
-    //     indices.push_back(i + 1);
-    //     indices.push_back(i);
-    //     indices.push_back(i + 2);
-    // }
 
     // ugly switch case
     GLfloat r, g, b;
diff --git a/src/main.cpp b/src/main.cpp
index 8bb9220..3b38088 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -50,6 +50,7 @@ int main()
     glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
     glfwSetCursorPosCallback(window, mouse_callback);
     glEnable(GL_DEPTH_TEST);
+    glEnable(GL_CULL_FACE); //GL_BACK GL_CCW by default
 
     SpaceFilling::initLUT();
     chunkmanager::init();
@@ -62,12 +63,12 @@ int main()
         lastFrame = currentFrame;
 
         // FPS Counter
-        // frames++;
-        // if(currentFrame - lastFPSFrame >= 1.0f){
-        //     std::cout << "FPS: " << frames << std::endl;
-        //     frames = 0;
-        //     lastFPSFrame = currentFrame;
-        // }
+        frames++;
+        if(currentFrame - lastFPSFrame >= 1.0f){
+            std::cout << "FPS: " << frames << " Frametime: " << deltaTime << std::endl;
+            frames = 0;
+            lastFPSFrame = currentFrame;
+        }
 
         glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);