Lwjgl mem info

public int getFreeMemory() {
        if(glGetString(GL_VENDOR).equals("NVIDIA Technologies")){
            return glGetInteger(NVXGpuMemoryInfo.GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX);
        }
        else if(glGetString(GL_VENDOR).equals("ATI Technologies")){
            return glGetInteger(ATIMeminfo.GL_RENDERBUFFER_FREE_MEMORY_ATI) + glGetInteger(ATIMeminfo.GL_TEXTURE_FREE_MEMORY_ATI) + glGetInteger(ATIMeminfo.GL_VBO_FREE_MEMORY_ATI);
        }
        else{
            throw new UnsupportedOperationException("Cannot retrieve GPU's memory info");
        }
    }

public int getMaxMemory() {
       if(glGetString(GL_VENDOR).equals("NVIDIA Technologies")){
            return glGetInteger(NVXGpuMemoryInfo.GL_GPU_MEMORY_INFO_TOTAL_AVAILABLE_MEMORY_NVX);
        }
        else if(glGetString(GL_VENDOR).equals("ATI Technologies")){
            return -1;
        }
        else{
            throw new UnsupportedOperationException("Cannot retrieve GPU's memory info");
        }
    }