Culling, rendering improvements and optimizations, block removing test.

Shaders/shader.frag

@@ -1,9 +1,13 @@
 #version 430 core
 
 out vec4 FragColor;
-in vec3 fragColor;
+in vec2 fragUV;
+in float lighting;
+
+uniform sampler2D uTexture;
 
 void main()
 {
-    FragColor = vec4(fragColor, 1.0);
+    vec4 texColor = texture(uTexture, fragUV);
+    FragColor = vec4(texColor.rgb * lighting, texColor.a);
 }