layout(location=0) out vec4 frag_color;
layout(location=1) in vec2 _vs_out_texcoord;
layout(location=0) in vec3 tbn_light_dir;
layout(location=0) out vec4 frag_color;
layout(location=1) in vec2 _vs_out_texcoord;
layout(location=0) in vec3 tbn_light_dir;