// each shader begins with a declaration of its version
#version 330 core

layout (location = 0) in vec3 position_in; // we declare input vertex attribues, we only a single one (position) now
layout (location = 1) in vec2 texture_coordinates_in;

uniform mat4 model;
uniform mat4 view;
uniform mat4 projection;

out vec2 texture_coordinates;

void main()
{
    gl_Position = projection * view * model * vec4(position_in, 1.0); // gl_Position is the output position of each vertex
    texture_coordinates = texture_coordinates_in;
}