Improved shader error formatting, hide puts statements that are only useful in debug mode.

shaders/vertex/lighting.glsl

@@ -1,7 +1,8 @@
 # version 150
 # extension GL_ARB_explicit_attrib_location : enable
 
-layout(location = 0) in vec3 vert;
+in vec3 vert;
+uniform vec3 SunLight;
 
 void main() {
   gl_Position = vec4(vert, 1.0);