waterreflect_ps11.psh

来自「hl2 source code. Do not use it illegal.」· PSH 代码 · 共 29 行

ps.1.1

; t0: 
;		texture: dudv map
;		texcoords: dudvmap texcoords
; t1:
;		texture: reflection render target
;		texcoords: 
; t2:	
;		texture: normal map (usef for fresnel calculation)
;		texcoords: 
; t4:	texture: normalization cube map
;		texcoords: eye vect

tex t0				; sample dudv map
texbem t1, t0		; reflection
tex t2				; normal map
tex t3				; eye vector (through normalization cubemap)

; dot eye-vector with per-pixel normal from t2
dp3_sat	r1.rgba, t3_bx2, t2_bx2

; run Fresnel approx. on it: R0 + (1-R0) (1-cos(q))^5
mul r0.a, 1-r1.a, 1-r1.a			// squared
mul r0.a, r0.a, r0.a				// quartic
mov r0.rgb, t1						// shove color from refraction render target into r0
+mul_sat r0.a, r0.a, 1-r1.a				// quintic