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ps.1.1
;------------------------------------------------------------------------------
; Computes the diffuse component of lighting using lightmap + bumpmap
; t0 - Normalmap
; t1 - Lightmap1
; t2 - Lightmap2
; t3 - Lightmap3
;
; The texture coordinates need to be defined as follows:
; tc0 - Normalmap and lightmap texture coordinates
; c0, c1, c2 - Axes of the lightmap coordinate system in tangent space
; c3 = a
; c4 = b
; c5 = c in a quadratic approx to pow( 1/2.2 )
;------------------------------------------------------------------------------
; Get the 3-vector from the normal map
tex t0
; Sample the lightmaps
tex t1
tex t2
tex t3
; Compute the dot product of axis 1 and the normal
dp3_sat r1, t0_bx2, c0
; Modulate the lightmap color by N dot Axis 1
mul r0, t1, r1
; Do the same for the other two axes
dp3_sat r1, t0_bx2, c1
mad r0, r1, t2, r0
dp3_sat r1, t0_bx2, c2
mad r0, r1, t3, r0
; Do quadratic approximation to pow( x, 1 / 2.2 )
;mad r1, c3, r0, c4 ; r1 = a*x + b
;mad_x4_sat r0, r1, r0, c5 ; r0 = r1*x + c = a*x*x + b*x + c
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