ShaderGlobal.cpp

// Renderer.hpp

class ShaderGlobal {
public:
    ShaderGlobal(const char* name) {
        this->handle = Rend::CreateShaderGlobal(name);
    }

    template <typename T>
    void operator = (const T& value) {
        Rend::UpdateShaderGlobal(this->handle, value);
    }

private:
    void* handle;
};

// Game.hpp
struct MyShaderGlobals {
    ShaderGlobal sun_dir = "sun_dir",
                 sun_ambient = "sun_amb",
                 sun_diffuse = "sun_diff",
                 sun_specular = "sun_spec";
};

MyShaderGlobals shaderGlobal;

// Game.cpp

// Automagically propagate uniform to the current shader and any shaders bound in the future
shaderGlobal.sun_diffuse = Float4(1.0, 0.9, 0.5, 1.0);