enable frustum culling!

shaders/world.frag

@@ -5,7 +5,6 @@ in vec2 v_uv;
 flat in uint v_tex_index;
 out vec4 color;
 uniform sampler2DArray tex;
-uniform bool debug;
 
 void main() {
   // base color from texture
@@ -13,8 +12,4 @@ void main() {
   //basic "lighting"
   float light = abs(v_normal.x) + .8 * abs(v_normal.y) + .6 * abs(v_normal.z);
   color *= vec4(vec3(light), 1.);
-  //highlight
-  if (debug) {
-    color *= vec4(1., 0., 0., 1.);
-  }
 }

src/world/render.rs

@@ -74,11 +74,22 @@ pub fn draw_world(
     if let Some(key) = chunk.mesh_index {
       let mesh = meshes.get(key).expect("Mesh index pointing to nothing");
       let world_position = position.as_vec3() * CHUNK_SIZE as f32;
+      
+      //Skip mesh if its empty
       if mesh.index_buffer.len() == 0 {
         continue
       }
-      let debug = !camera.frustum.is_box_visible(world_position, world_position + Vec3::splat(CHUNK_SIZE as f32));
 
+      //Frustum culling
+      {
+        let minp = world_position;
+        let maxp = world_position + Vec3::splat(CHUNK_SIZE as f32);
+        if !camera.frustum.is_box_visible(minp, maxp) {
+          continue
+        }
+      }
+
+      //Draw chunk mesh
       target.0.draw(
         &mesh.vertex_buffer,
         &mesh.index_buffer,
@@ -88,7 +99,6 @@ pub fn draw_world(
           view: view,
           perspective: perspective,
           tex: texture_sampler,
-          debug: debug
         },
         &draw_parameters
       ).unwrap();