www.pudn.com > GPU-KLT-1.0.zip > pyramid_pass1v.cg

/*
Copyright (c) 2008 University of North Carolina at Chapel Hill

This file is part of GPU-KLT.

GPU-KLT is free software: you can redistribute it and/or modify it under the
terms of the GNU Lesser General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option) any
later version.

GPU-KLT is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more
details.

You should have received a copy of the GNU Lesser General Public License along
with GPU-KLT. If not, see .
*/

void main(uniform sampler2D src_tex : TEXUNIT0,
                            float4 st0 : TEXCOORD0,
                            float4 st1 : TEXCOORD1,
                            float4 st2 : TEXCOORD2,
                            float4 st3 : TEXCOORD3,
                        out float4 color : COLOR)
{
   // This is the (odd) binomial kernel [1 4 6 4 1]
   float4 const f1 = float4(1, 4, 6, 4) / 16.0f;
   float  const f2 = 1.0 / 16.0f;

   float4 g1;
   float  g2;

   g1.x = tex2D(src_tex, st0.zw).x;
   g1.y = tex2D(src_tex, st1.xy).x;
   g1.z = tex2D(src_tex, st1.zw).x;
   g1.w = tex2D(src_tex, st2.xy).x;
   g2   = tex2D(src_tex, st2.zw).x;

   g1 *= 255.0f;
   g2 *= 255.0f;

   float v = dot(f1, g1) + f2*g2;

   color = unpack_4ubyte(v);
}