if(t==FRAGMENT_SHADER)
static RequireExtension _ext("GL_ARB_fragment_shader");
else if(t==VERTEX_SHADER)
static RequireExtension _ext("GL_ARB_vertex_shader");
if(t==FRAGMENT_SHADER)
static RequireExtension _ext("GL_ARB_fragment_shader");
else if(t==VERTEX_SHADER)
static RequireExtension _ext("GL_ARB_vertex_shader");