Add diffuse map

shaders/vert.glsl

@@ -2,9 +2,11 @@
 
 layout(location=0) in vec3 position;
 layout(location=1) in vec3 normal;
+layout(location=2) in vec2 uv;
 
 out vec3 vert_normal;
 out vec3 frag_position;
+out vec2 uv_coords;
 
 uniform mat3 normal_mat;
 uniform mat4 model;
@@ -14,5 +16,6 @@ uniform mat4 projection;
 void main() {
   vert_normal   = normal_mat * normal;
   frag_position = vec3(model * vec4(position, 1.0));
+  uv_coords     = uv;
   gl_Position   = projection * view * model * vec4(position, 1.0);
 };