//#include "Constants.h"
vs.1.1 
//fades a projected shadow texture the farther it gets away from a light

// Scale the vertex position by the heightmap dimensions
mul r3, v0, c[8]

// transform position
dp4 oPos.x, r3, c[0]
dp4 oPos.y, r3, c[1]
dp4 oPos.z, r3, c[2]
dp4 oPos.w, r3, c[3]

// Now we'll generate UVs for texture channel 1. This will be used to fade out the
// shadow the further away from the center of the object it is.
// We do this by getting the offset of this vertex from the center, scaling this by
// the maximum shadow distance, and offseting it by 0.5 so that 0 distance lies in
// the center of the Fade texture.
sub r0, r3, c[33]                           // Get the offset of the vertex from the center of the shadow, store it in r0
mad r0.xy, r0.xz, c[32].xx, c[32].yy        // Divide the offset by the maximum shadow range, and add 0.5
max r0.xy, r0.xy, c[32].zz                  // Raise to 0 if negative
min r0.xy, r0.xy, c[32].ww                  // Raise to 0 if negative
mov r0.zw, c[32].ww
mov oT1, r0

mov oD0, c[34]                              // Set the diffuse color of the vertex

// Calculate the UVs for the shadow texture itself
dp4 oT0.x, r3, c[28]
dp4 oT0.y, r3, c[29]
dp4 oT0.z, r3, c[30]
dp4 oT0.w, r3, c[31]