Constant conrod_glium::VERTEX_SHADER_120

pub const VERTEX_SHADER_120: &'static str = "
    #version 120

    attribute vec2 position;
    attribute vec2 tex_coords;
    attribute vec4 color;
    attribute float mode;

    varying vec2 v_tex_coords;
    varying vec4 v_color;
    varying float v_mode;

    void main() {
        gl_Position = vec4(position, 0.0, 1.0);
        v_tex_coords = tex_coords;
        v_color = color;
        v_mode = mode;
    }
";

The vertex shader used within the glium::Program for OpenGL.