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;------------------------------------------------------------------------------
; Computes the diffuse component of lighting using lightmap + bumpmap
; t0 - Normalmap
; t1 - Lightmap1
; t2 - Lightmap2
; t3 - Lightmap3
; t4 - Base1
; t5 - Base2
;
; 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
;------------------------------------------------------------------------------
ps.1.4
; output = (lightmapColor[0] * ( ( N dot basis[0] )^2 ) +
; lightmapColor[1] * ( ( N dot basis[1] )^2 ) +
; lightmapColor[2] * ( ( N dot basis[2] )^2 ) ) * lerp(base1, base2, lightmapColor[0].a)
; Get the 3-vector from the normal map
texld r0, t0
dp3 r5.r, r0_bx2, c0
dp3 r5.g, r0_bx2, c1
dp3 r5.b, r0_bx2, c2
mul r5.rgb, r5, r5
phase
; Sample the lightmaps
texld r1, t1
texld r2, t2
texld r3, t3
; Sample the base textures
texld r4, t4
texld r5, t5
mul r1, r1, r5.r
mad r1, r2, r5.g, r1
mad r1, r3, r5.g, r1
; blend base textures
lrp r4, r4, r5, r1.a
; assume overbright_2 !!!
mul_x2 r0, r1, r4
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