Fragment shader for mono-chrome texture rendering.

FontRender.fs

#version 330 core

// Our texture
uniform sampler2D   texture;

// Incoming attributes from the vertex shader
smooth  in  vec2 fs_texc;
smooth  in  vec4 fs_color;

// Output color
        out vec4 out_color;

void main()
{
    out_color  = texture2D(texture, fs_texc).rrrr * fs_color;
}