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; part of the Irrlicht Engine Shader example.
; This Direct3D9 vertex shader will be loaded by the engine.
; Please note that these example shaders don't do anything really useful.
; They only demonstrate that shaders can be used in Irrlicht.
vs.1.1
dcl_position v0; ; declare position
dcl_normal v1; ; declare normal
dcl_color v2; ; declare color
dcl_texcoord0 v3; ; declare texture coordinate
; transpose and transform position to clip space
mul r0, v0.x, c4
mad r0, v0.y, c5, r0
mad r0, v0.z, c6, r0
add oPos, c7, r0
; transform normal
dp3 r1.x, v1, c0
dp3 r1.y, v1, c1
dp3 r1.z, v1, c2
; renormalize normal
dp3 r1.w, r1, r1
rsq r1.w, r1.w
mul r1, r1, r1.w
; calculate light vector
m4x4 r6, v0, c10 ; vertex into world position
add r2, c8, -r6 ; vtxpos - lightpos
; normalize light vector
dp3 r2.w, r2, r2
rsq r2.w, r2.w
mul r2, r2, r2.w
; calculate light color
dp3 r3, r1, r2 ; dp3 with negative light vector
lit r5, r3 ; clamp to zero if r3 < 0, r5 has diffuce component in r5.y
mul oD0, r5.y, c9 ; ouput diffuse color
mov oT0, v3 ; store texture coordinates
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