Function create_glsl_program

src/renderer.rs:196–253

(
    gl: &Context,
    vs_file: &str,
    fs_file: &str,
    error_flag: &Arc<AtomicBool>,
    error_msg: &Arc<Mutex<String>>
)

fn create_glsl_program(
    gl: &Context,
    vs_file: &str,
    fs_file: &str,
    error_flag: &Arc<AtomicBool>,
    error_msg: &Arc<Mutex<String>>
) -> context::Program {
    unsafe {
        let vert_shader = gl.create_shader(context::VERTEX_SHADER)
            .expect("Failed creating vertex shader");
        let frag_shader = gl.create_shader(context::FRAGMENT_SHADER)
            .expect("Failed creating fragment shader");

        gl.shader_source(vert_shader, vs_file);
        gl.shader_source(frag_shader, fs_file);
        gl.compile_shader(vert_shader);
        gl.compile_shader(frag_shader);

        let id = gl.create_program()
            .expect("Failed creating program");

        gl.attach_shader(id, vert_shader);
        gl.attach_shader(id, frag_shader);
        gl.link_program(id);

        if !gl.get_program_link_status(id) {
            let log = gl.get_shader_info_log(vert_shader);
            if !log.is_empty() {
                set_error_for_egui(
                    error_flag, error_msg,
                    format!("ERROR: gl.get_program_link_status(): {}", log)
                );
            }
            let log = gl.get_shader_info_log(frag_shader);
            if !log.is_empty() {
                set_error_for_egui(
                    error_flag, error_msg,
                    format!("ERROR: gl.get_program_link_status(): {}", log)
                );
            }
            let log = gl.get_program_info_log(id);
            if !log.is_empty() {
                set_error_for_egui(
                    error_flag, error_msg,
                    format!("ERROR: gl.get_program_link_status(): {}", log)
                );
            }
            //unreachable!();
        } else {
            gl.detach_shader(id, vert_shader);
            gl.detach_shader(id, frag_shader);
            gl.delete_shader(vert_shader);
            gl.delete_shader(frag_shader);
        }

        return id;
    }
}