Constant conrod_glium::FRAGMENT_SHADER_300_ES

pub const FRAGMENT_SHADER_300_ES: &'static str = "
    #version 300 es
    precision mediump float;
    uniform sampler2D tex;

    in vec2 v_tex_coords;
    in vec4 v_color;
    flat in uint v_mode;

    out vec4 f_color;

    void main() {
        // Text
        if (v_mode == uint(0)) {
            f_color = v_color * vec4(1.0, 1.0, 1.0, texture(tex, v_tex_coords).r);

        // Image
        } else if (v_mode == uint(1)) {
            f_color = texture(tex, v_tex_coords);

        // 2D Geometry
        } else if (v_mode == uint(2)) {
            f_color = v_color;
        }
    }
";

The fragment shader used within the glium::Program for OpenGL ES.