doukutsu-rs/src/ggez/graphics/shader/glyphbrush.glslf

#version 150

uniform sampler2D font_tex;

in vec2 f_tex_pos;
in vec4 f_color;

out vec4 Target0;

void main() {
    float alpha = texture(font_tex, f_tex_pos).r;
    if (alpha <= 0.0) {
        discard;
    }
    Target0 = f_color * vec4(1.0, 1.0, 1.0, alpha);
}