display_set_gui_size(640, 480);
vRatio = 1;
var shader = 20;
var u_vRatio = shader_get_uniform(shader, "u_vRatio");
var u_amplitude = shader_get_uniform(shader, "u_amplitude");
var u_angle = shader_get_uniform(shader, "u_angle");
var angle = 3.14159265359;
shader_set(shader);
shader_set_uniform_f(u_vRatio, vRatio);
shader_set_uniform_f(u_amplitude, amplitude);
shader_set_uniform_f(u_angle, angle);
draw_surface(application_surface, 0, 0);
shader_reset();