ps_3_0

; parameters
; c8 = color offset
; c9 = (X,Y) scroll position, (Z) 0 = rendering background, 1 = rendering foreground

; input declarations
dcl_color		v0.xyzw
dcl_texcoord0	v1.xy

dcl_2d			s0
dcl_2d			s1
dcl_2d			s2

def c0, 1.0, 0.0, 1.0f, 1.0f
def c1, 0.5, 0.0, 0.0, 0.0

add r5, v1.xy, c9.xy	; add scroll position
frc r5, r5				; wrap

texld r0, r5, s0

texld r10, v1, s2		; load priority value
mov r11.r, c9.z

mov r1.xy, r0.ga
texld r2, r1, s1

add r2.rgb, r2.rgb, c8.yzw
min r2, r2, c0.xxxx		; clamp to 1.0
max r2, r2, c0.yyyy		; clamp to 0.0

if_eq r11.r, c0.y		; invert priority if rendering foreground
	sub r10.r, c0.x, r10.r
endif
mul r2.a, r2.a, r10.r	; multiply alpha with priority

mov oC0, r2