BLT-With-Graphics-Template/include/blt/gfx/renderer/shaders/2d_font.frag

#ifdef __cplusplus
#include <string>
const std::string shader_2d_font_frag = R"("
    #version 300 es
    precision mediump float;

    layout (location = 0) out vec4 FragColor;
    in vec2 uv;

    uniform sampler2D tex;
    uniform vec4 color;

    void main() {
        FragColor = texture(tex, uv).r * color;
        if (FragColor.a < 0.2)
            discard;
    }

")";
#endif