Added support for Kd

assets/shaders/shader.frag

@@ -1,6 +1,7 @@
 #version 140
 
 uniform sampler2D tex;
+uniform vec3 diffuse;
 
 in vec3 v_normal;
 in vec2 v_tex_coords;
@@ -18,7 +19,7 @@ void main() {
 
     vec4 factor = vec4(ambientLight + lambertComponent, 1.0);
 
-    color = factor * texture(tex, v_tex_coords);
+    color = factor * vec4(diffuse, 1.0) * texture(tex, v_tex_coords);
 
     if (color.a < 0.05) {
         discard;