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R"(
// Copyright (c) 2010-2026, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-443271.
//
// This file is part of the GLVis visualization tool and library. For more
// information and source code availability see https://glvis.org.
//
// GLVis is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.
uniform sampler2D alphaTex;
uniform sampler2D colorTex;
varying vec3 fNormal;
varying vec3 fPosition;
varying vec4 fColor;
varying vec2 fTexCoord;
uniform bool useClipPlane;
varying float fClipVal;
void fragmentClipPlane()
{
if (useClipPlane && fClipVal < 0.0)
{
discard;
}
}
void main()
{
fragmentClipPlane();
vec4 color = fColor * texture2D(colorTex, vec2(fTexCoord));
color = blinnPhong(fPosition, fNormal, color);
#ifdef USE_ALPHA
color.a *= texture2D(alphaTex, vec2(fTexCoord)).a;
#else
color.a *= texture2D(alphaTex, vec2(fTexCoord)).r;
#endif
gl_FragColor = color;
}
)"
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