gistfile1.txt

// vs.glsl
layout (binding = 1, std140) uniform Matrices
{
    mat4 modelViewProjMat;
};

layout (binding = 0) uniform Foo
{
    vec3 bar;
};

// main.cpp
GLuint idx = gl::GetUniformBlockIndex(llogl::get_id(basicShaderVsProg), "Matrices");
idx -> 1

gistfile2.txt

// vs.glsl
layout (binding = 1, std140) uniform Matrices
{
    mat4 modelViewProjMat;
};

// main.cpp
GLuint idx = gl::GetUniformBlockIndex(llogl::get_id(basicShaderVsProg), "Matrices");
idx -> 0