ps.1.0	//defines the pixel shader version (1.0)
def c0, 1.0f, 1.0f,1.0f, 1.0f	//defines a constant RGBA (full red, green and blue)
tex t0	//loads the t0 register with the RGBA data sampled from a texture
sub r0,c0,t0	//subtracts the texture color from the constant, and places the result in register r0