const GLchar vsh[] =
        "#version 330\n"
        ""
        "layout(location = 0) in vec2 a_position;"
        ""
        "uniform mat4 u_mv;"
        "uniform mat4 u_mvp;"
        ""
        "out vec3 v_p;"
        "out vec3 v_normal;"
        ""
        "void main()"
        "{"
        "    vec4 pos = vec4(a_position[0], 3*log(a_position[0])+sin(a_position[1]), a_position[1], 1.0);"
        "    gl_Position = u_mvp*pos;"
        "    v_p = (u_mv*pos).xyz;"
        "    v_normal = normalize(transpose(inverse(mat3(u_mv)))*vec3(3/a_position[0] , 1.0,  cos(a_position[1]) ));" //нормаль
        "}"
        ;

    const GLchar fsh[] =
        "#version 330\n"
        ""
        "in vec3 v_p;"
        "in vec3 v_normal;"
        ""
        "layout(location = 0) out vec4 o_color;"
        ""
        "void main()"
        "{"
        "   vec3 u_l = vec3(5.0, 10.0, 0.0);" //Положение источника света
        "   vec3 n = normalize(v_normal);" //нормировка нормали
        "   vec3 l = normalize(v_p-u_l);"
        "   vec3 e = normalize(-v_p);"
        "   float d = max(dot(l, n), 0.1);" //диффузное освещение
        "   vec3 r = normalize(reflect(l, e));" //вектор отражения

        "   float s = pow(max(dot(r, n), 0.0), 5.0);" //компонент зеркального блика
        "   o_color = vec4(d*vec3(1.0, 0.0, 0.0)+ vec3(s), 1.0);" //цвет поверхности
        "}"
        ;