render: move render_world_helper, remove chunks drawn behind view

internal/game/logic.go

@@ -145,6 +145,12 @@ func (g *Game) Init(win *glfw.Window) {
 
 					g.fullscreen = true
 				}
+				win.MakeContextCurrent()
+				glfw.SwapInterval(1)
+			}
+
+			if key == glfw.KeyF3 {
+				io.ShowDebugInfo = !io.ShowDebugInfo
 			}
 		}
 	})
@@ -225,6 +231,8 @@ func (g *Game) Update(win *glfw.Window, delta time.Duration) {
 	g.player.Update(g.world, delta)
 
 	g.view.LookAt(g.player.EyePosition().ToFloat32(), g.rotY, itype.Degrees(g.rotZ))
+	io.ViewPos = g.player.EyePosition()
+	io.ViewDir = itype.Vec3d(mgl64.Rotate3DY(float64(g.rotY.Radians())).Mul3(mgl64.Rotate3DZ(float64(itype.Degrees(g.rotZ)))).Mul3x1(mgl64.Vec3{1, 0, 0}))
 
 	render.Framewire.PushBox(g.player.WorldHitbox().ToFloat32(), color.White)