DYI GL object leak checker.

gl_leak_check.c

static void check_for_leaks()
{
    GLuint max_id = 10000; // better idea would be to keep track of assigned names.
    GLuint id;

    // if brute force doesn't work, you're not applying it hard enough
    for ( id = 1 ; id <= max_id ; id++ )
    {
#define CHECK( type ) if ( glIs##type( id ) ) fprintf( stderr, "GLX: leaked " #type " handle 0x%x\n", (unsigned int) id )
        CHECK( Texture );
        CHECK( Buffer );
        CHECK( Framebuffer );
        CHECK( Renderbuffer );
        CHECK( VertexArray );
        CHECK( Shader );
        CHECK( Program );
        CHECK( ProgramPipeline );
#undef CHECK
    }
}