Added -s mtl option

assets/shaders/shader.vert

@@ -2,6 +2,7 @@
 
 uniform mat4 perspective;
 uniform mat4 view;
+uniform vec3 texture_size;
 
 in vec3 vertex;
 in vec2 tex_coords;
@@ -12,7 +13,7 @@ out vec3 v_normal;
 
 void main() {
     v_normal = normal;
-    v_tex_coords = tex_coords;
+    v_tex_coords = vec2(tex_coords.x * texture_size.x, tex_coords.y * texture_size.y);
 
     gl_Position = perspective * view * vec4(vertex, 1.0);
 }