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// ============================================================================
//
// Program: Visualization Toolkit
// Module: vtkGaussianBlurPassShader_fs.glsl
//
// Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// All rights reserved.
// See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
//
// This software is distributed WITHOUT ANY WARRANTY; without even
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE. See the above copyright notice for more information.
//
// ============================================================================
// Fragment shader used by the gaussian blur filter render pass.
#version 110
uniform sampler2D source;
uniform float coef[3];
uniform float offsetx;
uniform float offsety;
void main(void)
{
vec2 tcoord=gl_TexCoord[0].st;
vec2 offset=vec2(offsetx,offsety);
gl_FragColor=coef[0]*texture2D(source,tcoord-offset)
+coef[1]*texture2D(source,tcoord)
+coef[2]*texture2D(source,tcoord+offset);
}
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